[User]
Hi, I'm looking to create a parametric spool holder system for use inside a storage box, based on the design concepts of the TUSH but with some key improvements. I've included a rough outline of what I have in mind, but I'd really like your help in making this as flexible as possible in terms of user customization.

The design has two main components: "rulers" and "spool holder sides". The rulers are basically long bars that sit at the bottom of the box and provide a track for the spool holder sides. The spool holder sides are the pieces that hold the bearings and support the actual spool.  Each side uses two standard 608 bearings.

Here's a breakdown of the design requirements I'm looking for:

**Key Goals:**

*   **Low Profile:**  The most critical thing is to keep the height of the spool as low as possible within a storage box. I'm aiming for a total height (from bottom of the holder to top of spool) that doesn't add more than 2mm to the spool diameter. The spools can vary between 198-200mm in diameter.
*   **Adjustability:** The spool holder sides should be able to accommodate a range of spool widths as well as diameters. The target spool widths vary between 30 and 70mm.
*   **Stability:**  The whole system should be stable within the box and shouldn't easily slide or tip over when moving the box or changing spools. I'm planning to use small silicone bumpers under the rulers and spool holders to prevent sliding.
*   **Box Compatibility:** The design should fit within a standard storage box that is roughly 200-204mm in internal height, but I'd really like to parameterize the ruler length so it could be easily adjusted for other box sizes. My target size of the ruler allows 3 spools of 750g or 2 spools of 1kg.
*   **Parametric Design:**  I want all dimensions of the design to be easily adjustable using parameters.

**Specific Design Elements and Parameters I need:**

*   **Rulers:**
    *   `ruler_size_y`: Length of the ruler (ideally parametric).
    *   `ruler_size_x`: Width of the ruler.
    *   `ruler_size_z`: Height/Thickness of the ruler.
    *   `ruler_gap`: Gap between the ruler and the holder sides
    *   `ruler_bottom_chamfer`: Chamfer on the bottom edge of the rulers
     *   The ruler has a wavy bottom surface, allowing adjustment of the holder in steps.

*   **Spool Holder Sides:**
    *   `spool_min_outer_dia`: Minimum outer diameter of a spool (for calculations).
    *   `spool_max_outer_dia`: Maximum outer diameter of a spool (for calculations).
    *   `spool_min_outer_width`: Minimum outer width of a spool.
    *   `spool_max_outer_width`: Maximum outer width of a spool.
    *   `holder_wall_strength`: Thickness of the holder walls.
    *  `holder_bottom_clearance`: Minimum height of spool to the bottom of the box.
    *  `holder_bottom_chamfer`: Chamfer on the bottom edge of the holders
    *   `holder_bearing_dist_x`: the distance between the two bearings on each side, based on `spool_min_outer_dia`

*   **Bearings:**
    *   `bearing_608_outer_dia`: Outer diameter of a 608 bearing (22mm).
    *   `bearing_608_inner_dia`: Inner diameter of a 608 bearing (8mm).
    *   `bearing_608_length`: Length of a 608 bearing (7mm).
    *   `bearing_608_gap`: Gap around the bearing.

*   **Bumpers:**
    *   `bumper_dia`: Diameter of the silicone bumpers.
    *   `bumper_height`: Height of the silicone bumpers.

*   **Sample Spool:**
      *   `sample_spool_outer_dia`: Outer diameter of a sample spool for visualization.
      *   `sample_spool_outer_width`: Outer width of a sample spool for visualization.
      *   `sample_spool_inner_dia`: Inner diameter of a sample spool for visualization.
      *   `sample_spool_pos_z`: Position of a sample spool

* **Grid System**
     * `ruler_grid_y`: The distance between grooves on the ruler. It's equal to `(bearing_608_length + bearing_608_gap + 2 * holder_wall_strength + 0.5) / 3`
     * `ruler_pos_y()`: helper function to calculate the vertical position of the holder.

* **Design Options**
   * `design_option_target`: Select target for visualization. "Show" to show the spoolholder, "Print Rulers" to show the rulers, "Print Spool Holders for 1 Spool" to show the single sides.
   * `design_option_color_printed`: Color of the printed parts.
   * `design_option_opacity`: Opacity of the printed parts.
   * `test_intersection_enable`: Enable intersection testing of parts with a cube.
   *  `test_intersection_rotation`: Rotation for testing the intersection.
   *   `test_intersection_position`: Position of the testing cube.
   *  `test_intersection_size`: Size of the testing cube.
   *   `design_option_enable_printed`: Enable or disable printing of the parts.
   *   `design_option_enable_bearings`: Enable or disable printing of the bearings.
   *   `design_option_enable_bumper`: Enable or disable printing of the bumpers.
    *  `design_option_enable_spool`: Enable or disable printing of the spool.
   *   `design_option_simplify_id`: Simplify the design of the parts.

**Libraries:**

I'm not particularly attached to any specific library, so you can use whatever you think is best. I'm familiar with the basics of OpenSCAD, and the `hull()` operation. I'm assuming you'll be using the standard OpenSCAD library and don't need to include any additional libraries.

It should be possible to print only the rulers or a small set of holders (two sides). The main aim is to have a stable set of parametric spool holders.

I think this is all the information you need to get started. If you have any questions, please ask.

Thanks for your help!

[Assistant]
MySpoolHolder.scad:
```
////////////////////////////////////////////////////////////////////////////////////////////////////
// Project  My Spool Holder
// File     MySpoolHolder.scad
// Content  Top Level Design Entry
// Author   Dirk Mehlfeldt
////////////////////////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////////////////////////
// parameter // parameter // parameter // parameter // parameter // parameter // parameter // parame
////////////////////////////////////////////////////////////////////////////////////////////////////

/* [Design Options] */

// Design Target
design_option_target = "Show"; // [Show, Print Rulers, Print Spool Holders for 1 Spool]
// Color of Printed Parts
design_option_color_printed = "Orange"; // [Magenta, Purple, DeepPink, Blue, Red, Lime, Green, Orange, Gold, Yellow, Brown, Silver, Grey, DimGrey]
// Alpha (Opacity) of Printed Parts
design_option_opacity = 1.0; // [0.0 : 0.01 : 1.0]

/* [View and Intersection] */

// Test Intersection Enable
test_intersection_enable = false;
// Test Intersection Rotation
test_intersection_rotation = [0.0, 0.0, 0.0]; // [-180.0 : 180.0]
// Test Intersection Position
test_intersection_position = [0.0, 0.0, 0.0]; // [-200.0 : 200.0]
// Test Intersection Size
test_intersection_size = [200.0, 53.0, 200.0]; // [-500.0 : 500.0]

// Enable Printed Parts
design_option_enable_printed = true;
// Enable Bearings
design_option_enable_bearings = true;
// Enable Bumper
design_option_enable_bumper = true;
// Enable Spool
design_option_enable_spool = true;

// Design Simplification
design_option_simplify_id = 0; // [0:Detailed, 1:Simple]

/* [Design Parameter] */

// Ruler Y Size
ruler_size_y = 169.0; // [50.0 : 1.0 : 500.0]

// Spool Min Outer Diameter
spool_min_outer_dia = 198.0; // [190.0 : 1.0 : 210.0]
// Spool Max Outer Diameter
spool_max_outer_dia = 200.0; // [190.0 : 1.0 : 210.0]
// Spool Min Outer Width
spool_min_outer_width = 30.0; // [30.0 : 1.0 : 70.0]
// Spool Max Outer Width
spool_max_outer_width = 70.0; // [30.0 : 1.0 : 70.0]

// Sample Spool Outer Diameter
sample_spool_outer_dia = 199.0; // [190.0 : 1.0 : 210.0]
// Sample Spool Outer Width
sample_spool_outer_width = 52.5; // [30.0 : 1.0 : 70.0]
// Sample Spool Inner Diameter
sample_spool_inner_dia = 104.5; // [90.0 : 1.0 : 110.0]

// Wall Strength in Holder
holder_wall_strength = 1.8; // [0.0 : 0.1 : 5.0]
// Bottom Clearance in Holder
holder_bottom_clearance = 0.0; // [0.0 : 0.1 : 5.0]
// Bottom Chamfer in Holder
holder_bottom_chamfer = 2.0; // [0.0 : 0.1 : 5.0]

// Ruler X Size
ruler_size_x = 10.0; // [1.0 : 0.1 : 10.0]
// Ruler Z Size
ruler_size_z = 8.0; // [1.0 : 0.1 : 10.0]
// Gap between Ruler and Holder
ruler_gap = 0.4; // [0.0 : 0.1 : 1.0]
// Bottom Chamfer in Ruler
ruler_bottom_chamfer = 2.0; // [0.0 : 0.1 : 5.0]

// Bearing 608 Outer Diameter
bearing_608_outer_dia = 22.0; // [22.0 : 1.0 : 22.0]
// Bearing 608 Inner Diameter
bearing_608_inner_dia = 8.0; // [8.0 : 1.0 : 8.0]
// Bearing 608 Length
bearing_608_length = 7.0; // [7.0 : 1.0 : 7.0]
// Bearing 608 Gap (Sum)
bearing_608_gap = 1.0; // [0.0 : 0.1 : 2.0]

// Bumper Diameter
bumper_dia = 7.0; // [5.0 : 1.0 : 10.0]
// Bumper Height
bumper_height = 2.0; // [1.0 : 0.5 : 3.0]

/* [Implicite Parameter] */

// Ruler Grid Size for Holder Positions
ruler_grid_y = (bearing_608_length + bearing_608_gap + 2 * holder_wall_strength + 0.5) / 3;

// X Distance of Bearings in Holder
// holder_bearing_dist_x = 2.0 * sqrt(pow(0.5 * (spool_min_outer_dia + bearing_608_outer_dia), 2.0) - pow(0.5 * (spool_min_outer_dia - bearing_608_outer_dia), 2.0));
holder_bearing_dist_x = 2.0 * sqrt(spool_min_outer_dia * bearing_608_outer_dia);

// Z Position of Spool
sample_spool_pos_z = sqrt(pow(0.5 * (sample_spool_outer_dia + bearing_608_outer_dia), 2.0) - pow(0.5 * holder_bearing_dist_x, 2.0)) + 0.5 * bearing_608_outer_dia + holder_bottom_clearance;

// X Distance of Rulers
ruler_dist_x = holder_bearing_dist_x - bearing_608_outer_dia - 0.5 * ruler_size_x - 2 * holder_wall_strength;

echo(str("Spool Dia Min = ", spool_min_outer_dia, " --> Total Height = ", sqrt(pow(0.5 * (spool_min_outer_dia + bearing_608_outer_dia), 2.0) - pow(0.5 * holder_bearing_dist_x, 2.0)) + 0.5 * bearing_608_outer_dia + holder_bottom_clearance + 0.5 * spool_min_outer_dia));
echo(str("Spool Dia Max = ", spool_max_outer_dia, " --> Total Height = ", sqrt(pow(0.5 * (spool_max_outer_dia + bearing_608_outer_dia), 2.0) - pow(0.5 * holder_bearing_dist_x, 2.0)) + 0.5 * bearing_608_outer_dia + holder_bottom_clearance + 0.5 * spool_max_outer_dia));

////////////////////////////////////////////////////////////////////////////////////////////////////
// dependencies // dependencies // dependencies // dependencies // dependencies // dependencies // d
////////////////////////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////////////////////////
// functions // functions // functions // functions // functions // functions // functions // functi
////////////////////////////////////////////////////////////////////////////////////////////////////

// Y Positions on Rulers
function ruler_pos_y(y) = ruler_grid_y * (round(y / ruler_grid_y + 0.5) - 0.5);

////////////////////////////////////////////////////////////////////////////////////////////////////
// modules // modules // modules // modules // modules // modules // modules // modules // modules /
////////////////////////////////////////////////////////////////////////////////////////////////////

module ball_bearing(di, do, l, type)
{
   // origin: center. orientation: axis in z

   if (design_option_enable_bearings)
   {
      color("Silver")
      {
         difference()
         {
            // body
            cylinder(d = do, h = l, $fn = 16, center = true);
            // hole
            cylinder(d = di, h = 2*l, $fn = 16, center = true);
            // grove
            rotate_extrude(angle = 360, $fn = 16)
               translate(v = [(di + do)/4, 0, 0])
               {
                  circle(d = (do - di)/3, $fn = 10);
                  square(size = [(do - di)/6, 2*l], center = true);
               }
         }
         // balls
         if (design_option_simplify_id <= 0)
            for (iball = [0:7])
               translate(v = [(di + do)/4 * sin(45*(iball + 0.5)), (di + do)/4 * cos(45*(iball + 0.5)), 0.0])
                  sphere(d = (do - di)/3, $fn = 10);
      }

      echo(str("Part Bearing  Type ", type, " Di ", di, " Do ", do, " L ", l));
   }
}

module ball_bearing_608()
{
   ball_bearing(di = bearing_608_inner_dia, do = bearing_608_outer_dia, l = bearing_608_length, type = "608");
}

module bumper(d, h)
{
   if (design_option_enable_bumper)
   {
      color(c = "Silver", alpha = 0.7)
         difference()
         {
            resize(newsize = [d, d, 2*h], auto = false)
               sphere(d = 1.0, $fn = 12);
            translate(v = [0.0, 0.0, 0.5 * (h + 1.0)])
               cube(size = [d + 1.0, d + 1.0, h + 1.0], center = true);
         }

      echo(str("Part Bumper   d ", d, " h ", h));
   }
}

module sample_spool(outer_dia, outer_width, inner_dia)
{
   // origin: center of spool. Orientation: axis in z

   if (design_option_enable_spool)
   {
      color("DimGrey")
      {
         difference()
         {
            union()
            {
               translate(v = [0.0, 0.0, 0.0])
                  rotate(a = [0, 0, 0])
                     cylinder(d = inner_dia, h = outer_width - 0.1, $fn = 30, center = true);
               translate(v = [0.0, 0.0,  0.5 * (outer_width - 3.0)])
                  rotate(a = [0, 0, 0])
                     cylinder(d = outer_dia, h = 3.0, $fn = 60, center = true);
               translate(v = [0.0, 0.0, -0.5 * (outer_width - 3.0)])
                  rotate(a = [0, 0, 0])
                     cylinder(d = outer_dia, h = 3.0, $fn = 60, center = true);
            }

            translate(v = [0.0, 0.0, 0.0])
               rotate(a = [0, 0, 0])
                  cylinder(d = inner_dia - 2*3.0, h = outer_width + 0.1, $fn = 30, center = true);
         }
      }
   }
}

module holder_outer_shape_2d()
{
   shape_cut_dia = pow(0.5 * holder_bearing_dist_x, 2.0) / (1.0 * (bearing_608_inner_dia + 4.0)); // 1.3 * spool_min_outer_dia; //
   shape_cut_pos_z = sqrt(pow(0.5 * (shape_cut_dia + (bearing_608_outer_dia + 4.0)), 2.0) - pow(0.5 * holder_bearing_dist_x, 2.0)) + 0.5 * bearing_608_outer_dia + holder_bottom_clearance;

   difference()
   {
      hull()
      {
         for (xsign = [-1, 1])
            translate(v = [xsign * 0.5 * holder_bearing_dist_x, holder_bottom_clearance + 0.5 * bearing_608_outer_dia])
               circle(d = bearing_608_outer_dia + 4.0, $fn = 20);

         translate(v = [0.0, 0.5 * max(holder_bottom_clearance, 1.0)])
            square(size = [holder_bearing_dist_x + bearing_608_outer_dia + 2.0, max(holder_bottom_clearance, 1.0)], center = true);
      }

      translate(v = [0.0, shape_cut_pos_z])
         circle(d = shape_cut_dia, $fn = 60);
      translate(v = [0.0, -0.5 * bearing_608_outer_dia])
         square(size = [holder_bearing_dist_x + 2 * bearing_608_outer_dia, bearing_608_outer_dia], center = true);
   }
}

module holder_inner_shape_2d()
{
   shape_cut_dia = 1.0 * spool_min_outer_dia;
   shape_cut_pos_z = sqrt(pow(0.5 * (shape_cut_dia + bearing_608_outer_dia), 2.0) - pow(0.5 * holder_bearing_dist_x, 2.0)) + 0.5 * bearing_608_outer_dia + holder_bottom_clearance;

   difference()
   {
      holder_outer_shape_2d();

      for (xsign = [-1, 1])
         translate(v = [xsign * 0.5 * holder_bearing_dist_x, holder_bottom_clearance + 0.5 * bearing_608_outer_dia])
         {
            circle(d = bearing_608_outer_dia + 2.0, $fn = 30);
            square(size = [1.0 * bearing_608_inner_dia, 2.0 * bearing_608_outer_dia], center = true);
         }

      if (0.5 * (shape_cut_dia + 4.0) > shape_cut_pos_z - (holder_bottom_chamfer - holder_wall_strength))
         square(size = [2 * sqrt(pow(0.5 * (shape_cut_dia + 4.0), 2.0) - pow(shape_cut_pos_z - (holder_bottom_chamfer - holder_wall_strength), 2.0)), 2.0 * bearing_608_outer_dia], center = true);

      translate(v = [0.0, shape_cut_pos_z])
         circle(d = shape_cut_dia + 4.0, $fn = 60);
      translate(v = [0.0, holder_bottom_clearance + 1.0 * bearing_608_outer_dia])
         square(size = [holder_bearing_dist_x + 2 * bearing_608_outer_dia, bearing_608_outer_dia], center = true);
   }

   for (xsign = [-1, 1])
      translate(v = [xsign * 0.5 * holder_bearing_dist_x, holder_bottom_clearance + 0.5 * bearing_608_outer_dia])
         circle(d = bearing_608_inner_dia - 0.2, $fn = 20);
}

module holder_single_side()
{
   // origin: center. orientation: axis in z
   if (design_option_enable_printed)
   {
      color(design_option_color_printed, design_option_opacity)
      {
         difference()
         {
            union()
            {
               translate(v = [0.0, 0.5 * (bearing_608_length + bearing_608_gap + holder_wall_strength), 0.0])
                  rotate(a = [90, 0, 0])
                     linear_extrude(height = holder_wall_strength, twist = 0, slices = 2, scale = 1.0, convexity = 10, $fn = 10, center = true)
                        holder_outer_shape_2d();

               translate(v = [0.0, 0.25 * (bearing_608_length + bearing_608_gap + holder_wall_strength), 0.0])
                  rotate(a = [90, 0, 0])
                     linear_extrude(height = 0.5 * (bearing_608_length + bearing_608_gap + holder_wall_strength - 0.2), twist = 0, slices = 2, scale = 1.0, convexity = 10, $fn = 10, center = true)
                        offset(r = -0.0 * holder_wall_strength)
                           holder_inner_shape_2d();

               for (xsign = [-1, 1])
                  translate(v = [xsign * 0.5 * holder_bearing_dist_x, 0.5 * (bearing_608_length + bearing_608_gap), holder_bottom_clearance + 0.5 * bearing_608_outer_dia])
                     rotate(a = [90, 0, 0])
                        cylinder(d = bearing_608_inner_dia + 4.0, h = bearing_608_gap - 0.4, $fn = 20, center = true);
            }

            if (holder_bottom_chamfer > 0.0)
               translate(v = [0.0, 0.5 * (bearing_608_length + bearing_608_gap) + holder_wall_strength, holder_bottom_chamfer])
                  rotate(a = [45, 0, 0])
                     translate(v = [0.0, 0.0, -0.5 * bearing_608_outer_dia])
                        cube(size = [holder_bearing_dist_x + 2 * bearing_608_outer_dia, bearing_608_outer_dia, bearing_608_outer_dia], center = true);

            difference()
            {
               translate(v = [0.0, 0.25 * (bearing_608_length + bearing_608_gap + holder_wall_strength), 0.0])
                  rotate(a = [90, 0, 0])
                     linear_extrude(height = bearing_608_length + bearing_608_gap + holder_wall_strength, twist = 0, slices = 2, scale = 1.0, convexity = 10, $fn = 10, center = true)
                        offset(r = -1.0 * holder_wall_strength)
                           holder_inner_shape_2d();

               translate(v = [0.0, 0.5 * (bearing_608_length + bearing_608_gap) + holder_wall_strength, holder_bottom_chamfer + sqrt(2.0) * holder_wall_strength])
                  rotate(a = [45, 0, 0])
                     translate(v = [0.0, 0.0, -0.5 * bearing_608_outer_dia])
                        cube(size = [holder_bearing_dist_x + 2 * bearing_608_outer_dia, bearing_608_outer_dia, bearing_608_outer_dia], center = true);

               for (xsign = [-1, 1])
                  translate(v = [xsign * 0.5 * ruler_dist_x, 0.0, 0.0])
                     linear_extrude(height = ruler_size_z + holder_wall_strength, twist = 0, slices = 2, scale = [1.0 - (ruler_size_z + holder_wall_strength) / ruler_size_z * (1.0 - (0.5 * ruler_size_x + holder_wall_strength) / (1.0 * ruler_size_x + holder_wall_strength)), 1.0], convexity = 10, $fn = 10, center = false)
                        offset(r = holder_wall_strength)
                           polygon(points =
                           [
                              for (y = [-0.5 * (bearing_608_length + bearing_608_gap + holder_wall_strength) :  0.2 :  1.0 * (bearing_608_length + bearing_608_gap + holder_wall_strength)]) [ 0.5 * ruler_size_x * (0.75 + 0.25 * cos(360 * y / ruler_grid_y)), y],
                              for (y = [ 1.0 * (bearing_608_length + bearing_608_gap + holder_wall_strength) : -0.2 : -0.5 * (bearing_608_length + bearing_608_gap + holder_wall_strength)]) [-0.5 * ruler_size_x * (0.75 + 0.25 * cos(360 * y / ruler_grid_y)), y]
                           ]);
            }

            for (xsign = [-1, 1])
               translate(v = [xsign * 0.5 * ruler_dist_x, 0.0, -0.1])
                  linear_extrude(height = ruler_size_z + 0.5 * ruler_gap + 0.1, twist = 0, slices = 2, scale = [(0.5 * ruler_size_x + ruler_gap) / (1.0 * ruler_size_x + ruler_gap), 1.0], convexity = 10, $fn = 10, center = false)
                     offset(r = 0.5 * ruler_gap)
                        polygon(points =
                        [
                           for (y = [-0.5 * (bearing_608_length + bearing_608_gap + holder_wall_strength) :  0.2 :  1.0 * (bearing_608_length + bearing_608_gap + holder_wall_strength)]) [ 0.5 * ruler_size_x * (0.75 + 0.25 * cos(360 * y / ruler_grid_y)), y],
                           for (y = [ 1.0 * (bearing_608_length + bearing_608_gap + holder_wall_strength) : -0.2 : -0.5 * (bearing_608_length + bearing_608_gap + holder_wall_strength)]) [-0.5 * ruler_size_x * (0.75 + 0.25 * cos(360 * y / ruler_grid_y)), y]
                        ]);
         }
      }
   }
}

module ruler()
{
   // origin: center. orientation: axis in z
   if (design_option_enable_printed)
   {
      color(design_option_color_printed, design_option_opacity)
      {
         difference()
         {
            union()
            {
               linear_extrude(height = ruler_size_z - 0.5 * ruler_gap, twist = 0, slices = 2, scale = [(0.5 * ruler_size_x - ruler_gap) / (1.0 * ruler_size_x - ruler_gap), 1.0], convexity = 10, $fn = 10, center = false)
                  offset(r = -0.5 * ruler_gap)
                     polygon(points = [
                        for (y = [-0.5 * ruler_size_y :  0.2 :  0.5 * ruler_size_y]) [ 0.5 * ruler_size_x * (0.75 - 0.25 * cos(360 * y / ruler_grid_y)), y],
                        for (y = [ 0.5 * ruler_size_y : -0.2 : -0.5 * ruler_size_y]) [-0.5 * ruler_size_x * (0.75 - 0.25 * cos(360 * y / ruler_grid_y)), y]
                        ]);
            }

            if (ruler_bottom_chamfer > 0.0)
               for (ysign = [-1, 1])
                  translate(v = [0.0, ysign * 0.5 * ruler_size_y, ruler_bottom_chamfer])
                     rotate(a = [ysign * 45, 0, 0])
                        translate(v = [0.0, 0.0, -0.5 * ruler_size_z])
                           cube(size = [ruler_size_x, ruler_size_z, ruler_size_z], center = true);
         }
      }
   }
}

////////////////////////////////////////////////////////////////////////////////////////////////////
// show // show // show // show // show // show // show // show // show // show // show // show // s
////////////////////////////////////////////////////////////////////////////////////////////////////

module show()
{
   intersection()
   {
      union()
      {
         // Rulers
         for (xsign = [-1, 1])
            translate(v = [xsign * 0.5 * ruler_dist_x, 0.0, 0.0])
            {
               // Rulers
               ruler();

               // Bumper
               if (holder_bottom_clearance < 1.0)
                  for (ysign = [-1, 0, 1])
                     translate(v = [0.0, ysign * (0.5 * ruler_size_y - 7.0), 0.0])
                        bumper(d = bumper_dia, h = bumper_height);
            }

         // Spool holders
         for (yspool = 14 * ruler_grid_y * [-1, 0, 1])
         {
            for (ysign = [-1, 1])
               translate(v = [0.0, ruler_pos_y(yspool + ysign * 0.5 * (sample_spool_outer_width - 6.0)), 0.0])
               {
                  rotate(a = [0, 0, 0])
                     holder_single_side();
                  rotate(a = [0, 0, 180])
                     holder_single_side();

                  // Ball Bearings
                  for (xsign = [-1, 1])
                     translate(v = [xsign * 0.5 * holder_bearing_dist_x, 0.0, holder_bottom_clearance + 0.5 * bearing_608_outer_dia])
                        rotate(a = [90, 0, 0])
                           ball_bearing_608();

                  // Bumper
                  if (holder_bottom_clearance < 1.0)
                     for (xsign = [-1, 1])
                        translate(v = [xsign * 0.5 * (holder_bearing_dist_x + bearing_608_outer_dia + 2.0 - 7.0), 0.0, 0.0])
                           bumper(d = bumper_dia, h = bumper_height);
               }
         }

         // Sample Spool
         for (yspool = 14 * ruler_grid_y * [0])
            translate(v = [0.0, yspool, sample_spool_pos_z])
               rotate(a = [90, 0, 0])
                  sample_spool(outer_dia = sample_spool_outer_dia, outer_width = sample_spool_outer_width, inner_dia = sample_spool_inner_dia);
      }

      // Test Intersection
      if (test_intersection_enable)
         rotate(a = test_intersection_rotation)
            translate(v = test_intersection_position)
               cube(size = test_intersection_size, center = true);
   }
}

////////////////////////////////////////////////////////////////////////////////////////////////////
// print // print // print // print // print // print // print // print // print // print // print /
////////////////////////////////////////////////////////////////////////////////////////////////////

module print(enable_rulers = true)
{
   // print area
   if ($preview)
      translate(v = [0.0, 0.0, 1.0 / 2])
         difference()
         {
            cube(size = [210.0 - 0.0, 210.0 - 0.0, 1.0], center = true);
            cube(size = [210.0 - 2.0, 210.0 - 2.0, 2.0], center = true);
         }

   if (enable_rulers)
   {
      // Things to be printed: Rulers
      translate(v = [0.0, -90.0, 0.0])
         rotate(a = [0, 0, 90])
            ruler();
      translate(v = [0.0, -75.0, 0.0])
         rotate(a = [0, 0, 90])
            ruler();
   }
   else
   {
      // Things to be printed: Holders
      translate(v = [-0.15 * holder_bearing_dist_x, -65.0 + 0 * (holder_bottom_clearance + 0.5 * bearing_608_outer_dia + 8.0) + 0 * 5.0, 0.5 * (bearing_608_length + bearing_608_gap) + holder_wall_strength])
         rotate(a = [-90, 0, 0])
            holder_single_side();
      translate(v = [ 0.15 * holder_bearing_dist_x, -65.0 + 2 * (holder_bottom_clearance + 0.5 * bearing_608_outer_dia + 8.0) + 1 * 5.0, 0.5 * (bearing_608_length + bearing_608_gap) + holder_wall_strength])
         rotate(a = [-90, 0, 180])
            holder_single_side();
      translate(v = [-0.15 * holder_bearing_dist_x, -65.0 + 2 * (holder_bottom_clearance + 0.5 * bearing_608_outer_dia + 8.0) + 2 * 5.0, 0.5 * (bearing_608_length + bearing_608_gap) + holder_wall_strength])
         rotate(a = [-90, 0, 0])
            holder_single_side();
      translate(v = [ 0.15 * holder_bearing_dist_x, -65.0 + 4 * (holder_bottom_clearance + 0.5 * bearing_608_outer_dia + 8.0) + 3 * 5.0, 0.5 * (bearing_608_length + bearing_608_gap) + holder_wall_strength])
         rotate(a = [-90, 0, 180])
            holder_single_side();
   }
}

////////////////////////////////////////////////////////////////////////////////////////////////////
// main // main // main // main // main // main // main // main // main // main // main // main // m
////////////////////////////////////////////////////////////////////////////////////////////////////

if ($preview)
{
   if (design_option_target == "Show")
      show();
   else if (design_option_target == "Print Rulers")
      print(enable_rulers = true);
   else if (design_option_target == "Print Spool Holders for 1 Spool")
      print(enable_rulers = false);
}
else
{
   if (design_option_target == "Show")
      show();
   else if (design_option_target == "Print Rulers")
      print(enable_rulers = true);
   else if (design_option_target == "Print Spool Holders for 1 Spool")
      print(enable_rulers = false);
}

////////////////////////////////////////////////////////////////////////////////////////////////////
// muell // muell // muell // muell // muell // muell // muell // muell // muell // muell // muell /
////////////////////////////////////////////////////////////////////////////////////////////////////

module muell()
{
}

```


[User]
Hi, I'm looking for help creating a set of OpenSCAD files for a boring head adapter for small lathes. I have a basic design in mind, but I need it to be parametric so it can fit different lathe spindles and boring heads, and I'm not really familiar with OpenSCAD libraries.

The main idea is to make an adapter that connects a generic 2" boring head (which has a 1-1/2" x 18 TPI thread) to the spindle of different small lathes. I'd like to support at least the following lathes:
*   EMCO Unimat 3 (M14 x 1 spindle thread)
*   EMCO Unimat SL (M12 x 1 spindle thread)
*   Taig Micro Lathe II (3/4" x 16 TPI spindle thread)
*   Sherline (same as Taig: 3/4" x 16 TPI spindle thread)

I'd like to be able to easily switch between these lathe types.

The adapter itself needs to have the 1-1/2" x 18 TPI external thread to match the boring head, and an internal thread matching the specified lathe spindle. The adapter will also need a couple of small holes for tommy bars to help with tightening/removal.  The outside diameter of the thread should also be configurable as I found a few settings that worked best.

Here are some other design details:

*   The adapter should be a cylindrical body with a thread for the boring head on the outside, and the lathe-specific thread on the inside.
*   The external thread for the boring head should have a configurable diameter - the existing design uses 1.48 inches, but I'd like to be able to adjust it.  I'd like to have 1.46, 1.47 and 1.48 as options.
*  The tommy bar holes should be configurable in terms of diameter, location and number and be a through-hole.
*   The adapter should be a configurable thickness or length.
*  A small chamfer on the headstock end of the adapter would be nice for fitment purposes, also configurable based on the selected lathe.
*   The main body should be able to be configured to use either a metric or inch units.

For the threads, I think I need to use the `threads.scad` library from Dan Kirshner (from Thingiverse). It should be placed in  `C:\Program Files\OpenSCAD\libraries\Thingiverse` in order to use.

I guess I'd need at least one main file and a configuration file maybe? I'm not sure how best to structure this.

Let me know if you need more info.

[Assistant]
small_lathe_boring_head_adapter.scad:
```
// Adapter boss for cheap generic eBay 2" boring head to Unimat 3 and other small lathes.
// Boring head has 1-1/2" x 18 TPI thread, normally used with screw-on 2MT or 3MT arbor.
// Small holes aid removal with Unimat 3 chuck tommy bar pins.
// Print at 100% infill (ie. solid) from PETG as that is oil resistant.

// Take sensible and appropriate care when using this or any other machine tool.
// Use at your own risk.

// Written/scripted by (C) Steve Malikoff 2021 in Brisbane, Australia
// Last updated 2021-05-19

// The thread library used here is the excellent 'OpenSCAD threads module' by Dan Kirshner:
// https://www.thingiverse.com/thing:1938150
// http://dkprojects.net/openscad-threads/
// Place it in  C:\Program Files\OpenSCAD\libraries\Thingiverse
include <Thingiverse/threads.scad>

// Some popular desktop lathe headstock spindle sizes
// Unimat 3: 	M14 x 1
// Unimat SL:	M12 x 1
// Taig:		3/4" x 16 TPI
// Sherline:	same as Taig

LATHE = "EMCO Unimat 3";	// ["EMCO Unimat 3", "EMCO Unimat SL", "Taig Micro Lathe II", "Sherline"]

// Outer thread 1-1/2" x 18 TPI to suit generic 2" diameter boring head

BORING_HEAD_THREAD_DIA_INCH = 1.48; // [1.48, 1.47, 1.46]
TOMMY_PINS_DIA_MM = 4.0;

module CustomiserStopper() {} // ----Stop Customiser looking beyond here ----

// Generate the model proper
BoringHeadToUnimatAdapter();

INCH = 25.4;

ADAPTER_THICK = 14 / INCH;

FACETS = 273;
$fn = FACETS;

module BoringHeadToUnimatAdapter()
{
	difference()
	{
		Body();
		if (LATHE == "EMCO Unimat 3")
		{
			render()
				HeadstockSpindleThreadU3();
			Chamfer();
		}
		if (LATHE == "EMCO Unimat SL")
		{
			render()
				HeadstockSpindleThreadSL();
			Chamfer();
		}
		if (LATHE == "Taig Micro Lathe II")
		{
			render()
				HeadstockSpindleThreadTaig();
		}
		if (LATHE == "Sherline")
		{
			render()
				HeadstockSpindleThreadTaig();
		}
		PinHoles();
	}
}

module Body()
{
	english_thread(diameter=BORING_HEAD_THREAD_DIA_INCH, threads_per_inch=18, length=ADAPTER_THICK);
}

// Includes slight clearance tolerance so standard Unimat tommy bars are an easy fit
module PinHoles()
{
	translate([INCH/2, 0, 0])
		cylinder(d=TOMMY_PINS_DIA_MM + 0.2, h=100);
	translate([-INCH/2, 0, 0])
		cylinder(d=TOMMY_PINS_DIA_MM + 0.2, h=100);
}

module Chamfer()
{
	translate([0,0,12.5])
	{
		if (LATHE == "EMCO Unimat 3")
		{
			cylinder(d1=13, d2=15, h=2);
		}
		if (LATHE == "EMCO Unimat SL")
		{
			cylinder(d1=11, d2=13, h=2);
		}
		if (LATHE == "Taig Micro Lathe II")
		{
			cylinder(d1=18.04, d2=20.04, h=2);
		}
		if (LATHE == "Sherline")
		{
			cylinder(d1=18.04, d2=20.04, h=2);
		}
	}
}

module HeadstockSpindleThreadU3()
{
	echo("U3");
    metric_thread(diameter=14, pitch=1, length=9, internal=true);
    translate([0,0, 9])
        cylinder(d=14.04, h=5);
}

module HeadstockSpindleThreadSL()
{
	echo("SL");
    metric_thread(diameter=12, pitch=1, length=9, internal=true);
    translate([0,0, 9])
        cylinder(d=12.04, h=5);
}

module HeadstockSpindleThreadTaig()
{
	echo("Taig");
    english_thread(diameter=0.75, threads_per_inch=16, length=9, internal=true);
    translate([0,0, 10.5])
        cylinder(d=19.09, h=4);
}

```


[User]
I'd like to create a customizable LED sign using OpenSCAD, and I need some help designing the files.  I want it to be a 3D printed box with raised, rounded letters on the top that will allow light to pass through. It should have a separate base and lid, or the option for a single upright piece. Here's a breakdown of what I'm looking for:

**Core Structure:**

*   **Rounded Letters:**  The letters should have a rounded, bubble-like appearance, similar to a Minkowski sum operation. I’d like the user to be able to control the rounding radius.
*   **Extruded Text:** The text should be extruded to a specified height, acting as the base for the rounded letters and the walls of the sign.
*   **Hollowed Interior:**  The interior of the letter forms should be hollow, both in the base and the lid (or combined single piece), so I can place LED strips inside.  The user should be able to set the wall thickness.
*  **Thinner Top Layer:**  The top layer of the lid (the very top surfaces of the letters) needs to be thinner than the rest, allowing light from the LEDs to pass through.  I'd like the user to be able to control both the thickness of this top layer, and the depth of the offset that's needed to create that thin layer.
*   **Base Scale:**  The base should have a scale factor that allows the user to reduce the base height without changing the text height and rounded portions.

**Customization Options:**

*   **Text String:**  The user needs to be able to specify the text to be rendered.
*   **Font:**  Users should be able to select from a list of fonts, and select the font style such as bold or italic.
*   **Font Size:**  The user needs to be able to control the font size in millimeters.
*   **Text Height:** The extrusion height of the letters needs to be a customizable parameter (in mm).
*   **Rounding Radius (Bubble):**  The radius of the rounding effect on the letters needs to be adjustable (in mm).
*  **Spacing:** The user should be able to adjust the spacing between the letters.
*   **Wall Thickness:** The wall thickness of both the base and lid (or entire piece) should be customizable (in mm).
*   **Top Layer Thickness:** The thickness of the top layer of the lid that lets light through should be adjustable (in mm).
*   **Top Layer Adjustment:** The amount to lower the top layer by, needs to be user adjustable, relative to the bubble setting.
*   **Base Scale:** The scale of the base's z height can be changed by the user.
*  **Starting Angle:** So that the letters are angled, and can print without support.
*   **Keyhole Slots:**  Optional keyhole slots for wall mounting should be added.  The user should be able to control the position of these slots (spacing from the center), the screw head diameter, the slot diameter, the slot length, and the slot depth and height adjustment.
*  **Delta:** a value to ignore small features.

**Quality Settings:**

*   **Round Faces ($fn):**  The user needs to be able to control the number of faces used in the round shapes, allowing for smoother curves.

**Output Options:**

*   **Separate STL Files:**  Users should be able to specify if they want an STL file for just the base, just the lid, both as separate files, or a single upright piece combining both.

**Additional Notes:**

*   I'd prefer to avoid any complicated OpenSCAD libraries, if possible. I want to keep this relatively straightforward.

I'm hoping to get a parametric design that I can easily adjust and reprint as needed. Let me know if you need any further information!

[Assistant]
RoundedTextBox_For_LEDs_v1.0.scad:
```
type="top_lid"; //[bottom_container,top_lid,both,upright]

//Set the text to render, recommend to use all capitals
textstring="KENZIE";

//Font name. In the list is first a selection of bold fonts. After the dashed line you get a list of thinner fonts, which are not really recommended.
FontName="Arial"; //[Poiret One,Arial,Pooh,Mickey,Minnie,Broadway,BungeeHairline,Holtwood One SC,Alegreya Sans SC Black,Alfa Slab One,Asset,Black Ops One,Bowlby One,Bowlby One SC,Chango,Cinzel Decorative Black,Coustard,Elsie Black,Elsie Swash Caps Black,Erica One,Exo2 Black,Fascinate,Lobster,PassionOne,Plaster,Poller One,Rammetto One,Ruslan Display,Sarpanch Black,Sigmar One,Sonsie One,Titan One,Ultra,Hanalei,---------,ABeeZee,Abel,Abril Fatface,Aclonica,Acme,Actor,Adamina,Advent Pro,Aguafina Script,Akronim,Aladin,Aldrich,Alef,Alex Brush,Alice,Alike,Alike Angular,Allan,Allerta,Allerta Stencil,Allura,Almendra,Almendra Display,Almendra SC,Amarante,Amaranth,Amatic SC,Amethysta,Amiri,Anaheim,Andada,Andika,Angkor,Annie Use Your Telescope,Anonymous Pro,Antic,Antic Didone,Antic Slab,Anton,Arapey,Arbutus,Arbutus Slab,Architects Daughter,Archivo Black,Archivo Narrow,Arimo,Arizonia,Armata,Artifika,Arvo,Asap,Asset,Astloch,Asul,Atomic Age,Aubrey,Audiowide,Autour One,Average,Average Sans,Averia Gruesa Libre,Averia Libre,Averia Sans Libre,Averia Serif Libre,Bad Script,Balthazar,Bangers,Basic,Battambang,Baumans,Bayon,Belgrano,Belleza,BenchNine,Bentham,Berkshire Swash,Bevan,Bigelow Rules,Bigshot One,Bilbo,Bilbo Swash Caps,Bitter,Black Ops One,Bokor,Bonbon,Boogaloo,Bowlby One,Bowlby One SC,Brawler,Bree Serif,Bubblegum Sans,Bubbler One,Buda,Buenard,Butcherman,Butterfly Kids,Cabin,Cabin Condensed,Cabin Sketch,Caesar Dressing,Cagliostro,Calligraffitti,Cambay,Cambo,Candal,Cantarell,Cantata One,Cantora One,Capriola,Cardo,Carme,Carrois Gothic,Carrois Gothic SC,Carter One,Caudex,Cedarville Cursive,Ceviche One,Changa One,Chango,Chau Philomene One,Chela One,Chelsea Market,Chenla,Cherry Cream Soda,Cherry Swash,Chewy,Chicle,Chivo,Cinzel,Cinzel Decorative,Clicker Script,Coda,Coda Caption,Codystar,Combo,Comfortaa,Coming Soon,Concert One,Condiment,Content,Contrail One,Convergence,Cookie,Copse,Corben,Courgette,Cousine,Coustard,Covered By Your Grace,Crafty Girls,Creepster,Crete Round,Crimson Text,Croissant One,Crushed,Cuprum,Cutive,Cutive Mono,Damion,Dancing Script,Dangrek,Dawning of a New Day,Days One,Dekko,Delius,Delius Swash Caps,Delius Unicase,Della Respira,Denk One,Devonshire,Dhurjati,Didact Gothic,Diplomata,Diplomata SC,Domine,Donegal One,Doppio One,Dorsa,Dosis,Dr Sugiyama,Droid Sans,Droid Sans Mono,Droid Serif,Duru Sans,Dynalight,Eagle Lake,Eater,EB Garamond,Economica,Ek Mukta,Electrolize,Elsie,Elsie Swash Caps,Emblema One,Emilys Candy,Engagement,Englebert,Enriqueta,Erica One,Esteban,Euphoria Script,Ewert,Exo,Exo 2,Expletus Sans,Fanwood Text,Fascinate,Fascinate Inline,Faster One,Fasthand,Fauna One,Federant,Federo,Felipa,Fenix,Finger Paint,Fira Mono,Fira Sans,Fjalla One,Fjord One,Flamenco,Flavors,Fondamento,Fontdiner Swanky,Forum,Francois One,Freckle Face,Fredericka the Great,Fredoka One,Freehand,Fresca,Frijole,Fruktur,Fugaz One,Gabriela,Gafata,Galdeano,Galindo,Gentium Basic,Gentium Book Basic,Geo,Geostar,Geostar Fill,Germania One,GFS Didot,GFS Neohellenic,Gidugu,Gilda Display,Give You Glory,Glass Antiqua,Glegoo,Gloria Hallelujah,Goblin One,Gochi Hand,Gorditas,Goudy Bookletter 1911,Graduate,Grand Hotel,Gravitas One,Great Vibes,Griffy,Gruppo,Gudea,Gurajada,Habibi,Halant,Hammersmith One,Hanalei,Hanalei Fill,Handlee,Hanuman,Happy Monkey,Headland One,Henny Penny,Herr Von Muellerhoff,Hind,Homemade Apple,Homenaje,Iceberg,Iceland,IM Fell Double Pica,IM Fell Double Pica SC,IM Fell DW Pica,IM Fell DW Pica SC,IM Fell English,IM Fell English SC,IM Fell French Canon,IM Fell French Canon SC,IM Fell Great Primer,IM Fell Great Primer SC,Imprima,Inconsolata,Inder,Indie Flower,Inika,Irish Grover,Istok Web,Italiana,Italianno,Jacques Francois,Jacques Francois Shadow,Jim Nightshade,Jockey One,Jolly Lodger,Josefin Sans,Josefin Slab,Joti One,Judson,Julee,Julius Sans One,Junge,Jura,Just Another Hand,Just Me Again Down Here,Kalam,Kameron,Kantumruy,Karla,Karma,Kaushan Script,Kavoon,Kdam Thmor,Keania One,Kelly Slab,Kenia,Khand,Khmer,Khula,Kite One,Knewave,Kotta One,Koulen,Kranky,Kreon,Kristi,Krona One,La Belle Aurore,Laila,Lakki Reddy,Lancelot,Lateef,Lato,League Script,Leckerli One,Ledger,Lekton,Lemon,Liberation Sans,Libre Baskerville,Life Savers,Lilita One,Lily Script One,Limelight,Linden Hill,Lobster,Lobster Two,Londrina Outline,Londrina Shadow,Londrina Sketch,Londrina Solid,Lora,Love Ya Like A Sister,Loved by the King,Lovers Quarrel,Luckiest Guy,Lusitana,Lustria,Macondo,Macondo Swash Caps,Magra,Maiden Orange,Mako,Mallanna,Mandali,Marcellus,Marcellus SC,Marck Script,Margarine,Marko One,Marmelad,Martel Sans,Marvel,Mate,Mate SC,Maven Pro,McLaren,Meddon,MedievalSharp,Medula One,Megrim,Meie Script,Merienda,Merienda One,Merriweather,Merriweather Sans,Metal,Metal Mania,Metamorphous,Metrophobic,Michroma,Milonga,Miltonian,Miltonian Tattoo,Miniver,Miss Fajardose,Modak,Modern Antiqua,Molengo,Molle,Monda,Monofett,Monoton,Monsieur La Doulaise,Montaga,Montez,Montserrat,Montserrat Alternates,Montserrat Subrayada,Moul,Moulpali,Mountains of Christmas,Mouse Memoirs,Mr Bedfort,Mr Dafoe,Mr De Haviland,Mrs Saint Delafield,Mrs Sheppards,Muli,Mystery Quest,Neucha,Neuton,New Rocker,News Cycle,Niconne,Nixie One,Nobile,Nokora,Norican,Nosifer,Nothing You Could Do,Noticia Text,Noto Sans,Noto Serif,Nova Cut,Nova Flat,Nova Mono,Nova Oval,Nova Round,Nova Script,Nova Slim,Nova Square,NTR,Numans,Nunito,Odor Mean Chey,Offside,Old Standard TT,Oldenburg,Oleo Script,Oleo Script Swash Caps,Open Sans,Open Sans Condensed,Oranienbaum,Orbitron,Oregano,Orienta,Original Surfer,Oswald,Over the Rainbow,Overlock,Overlock SC,Ovo,Oxygen,Oxygen Mono,Pacifico,Paprika,Parisienne,Passero One,Passion One,Pathway Gothic One,Patrick Hand,Patrick Hand SC,Patua One,Paytone One,Peddana,Peralta,Permanent Marker,Petit Formal Script,Petrona,Philosopher,Piedra,Pinyon Script,Pirata One,Plaster,Play,Playball,Playfair Display,Playfair Display SC,Podkova,Poiret One,Poller One,Poly,Pompiere,Pontano Sans,Port Lligat Sans,Port Lligat Slab,Prata,Preahvihear,Press Start 2P,Princess Sofia,Prociono,Prosto One,PT Mono,PT Sans,PT Sans Caption,PT Sans Narrow,PT Serif,PT Serif Caption,Puritan,Purple Purse,Quando,Quantico,Quattrocento,Quattrocento Sans,Questrial,Quicksand,Quintessential,Qwigley,Racing Sans One,Radley,Rajdhani,Raleway,Raleway Dots,Ramabhadra,Ramaraja,Rambla,Rammetto One,Ranchers,Rancho,Ranga,Rationale,Ravi Prakash,Redressed,Reenie Beanie,Revalia,Ribeye,Ribeye Marrow,Righteous,Risque,Roboto,Roboto Condensed,Roboto Slab,Rochester,Rock Salt,Rokkitt,Romanesco,Ropa Sans,Rosario,Rosarivo,Rouge Script,Rozha One,Rubik Mono One,Rubik One,Ruda,Rufina,Ruge Boogie,Ruluko,Rum Raisin,Ruslan Display,Russo One,Ruthie,Rye,Sacramento,Sail,Salsa,Sanchez,Sancreek,Sansita One,Sarina,Sarpanch,Satisfy,Scada,Scheherazade,Schoolbell,Seaweed Script,Sevillana,Seymour One,Shadows Into Light,Shadows Into Light Two,Shanti,Share,Share Tech,Share Tech Mono,Shojumaru,Short Stack,Siemreap,Sigmar One,Signika,Signika Negative,Simonetta,Sintony,Sirin Stencil,Six Caps,Skranji,Slabo 13px,Slabo 27px,Slackey,Smokum,Smythe,Sniglet,Snippet,Snowburst One,Sofadi One,Sofia,Sonsie One,Sorts Mill Goudy,Source Code Pro,Source Sans Pro,Source Serif Pro,Special Elite,Spicy Rice,Spinnaker,Spirax,Squada One,Sree Krushnadevaraya,Stalemate,Stalinist One,Stardos Stencil,Stint Ultra Condensed,Stint Ultra Expanded,Stoke,Strait,Sue Ellen Francisco,Sunshiney,Supermercado One,Suranna,Suravaram,Suwannaphum,Swanky and Moo Moo,Syncopate,Tangerine,Taprom,Tauri,Teko,Telex,Tenali Ramakrishna,Tenor Sans,Text Me One,The Girl Next Door,Tienne,Timmana,Tinos,Titan One,Titillium Web,Trade Winds,Trocchi,Trochut,Trykker,Tulpen One,Ubuntu,Ubuntu Condensed,Ubuntu Mono,Ultra,Uncial Antiqua,Underdog,Unica One,UnifrakturCook,UnifrakturMaguntia,Unkempt,Unlock,Unna,Vampiro One,Varela,Varela Round,Vast Shadow,Vesper Libre,Vibur,Vidaloka,Viga,Voces,Volkhov,Vollkorn,Voltaire,VT323,Waiting for the Sunrise,Wallpoet,Walter Turncoat,Warnes,Wellfleet,Wendy One,Wire One,Yanone Kaffeesatz,Yellowtail,Yeseva One,Yesteryear,Zeyada]

//Font style - but it might be your desired style is not available for the selected font. Just try it and see.
textstyle="Bold";//[Regular,Bold,Italic,Bold Italic,Narrow,ExtraBold,Black,Light,Thin,Medium Italic, SemiBold,Condensed,Expanded,Oblique]

// Spacing, default: 1. tweak to get letters closer, or just adjust the bubble size.
Spacing = 1;

//Set font size in mm
textsize=65;

//Text height (extrusion) in mm
textheight=15;

//bubble radius. Increase until the letters flow together on the interior of the case, and interior high peaks are reduced.
bubble=18;

//Rim thickness and height of the cover lid. Also affects the shell thickness. This should be split into a seperate variable.
wall=2;

//Lid wiggle so it fits
wiggle=0.0;

//Top text layer thickness (mm). 0.4 (2 layers) to 0.8 (4 layers) so the light can glow through
top_layer_thickness=0.8;

//Top text layer adjustment. Assuming textheight=15... When Bubble between 10-13 use 0.4, between 14-18 use 0.5, between 18-26 use 0.6, between 27-31 use 0.7, between 32-? use 0.8
top_layer_adjustment=0.5;

//Scale to decrease the base by. 0.5 is 1/2.  We don't need the full height, but need enough room for LEDs.
base_scale=0.5;

//starting angle so printing is possible without supports. Dont go below 5 degree!
angle=55;

//ignore all features smaller than delta (small holes, etc make the box connecting lip too complex)
delta=3;

//number of faces for the rounding
round_faces=3;

/* [Keyhole slots] */
//Add keyhole slots?
keyhole_boolean=true;
//Distance of the left keyhole slot from the center (mm). I aim for flat spots.
keyhole_spacing_left=80;
//Distance of the right keyhole slot from the center (mm). I aim for flat spots.
keyhole_spacing_right=80;
//keyhole screw head diameter (mm)
keyhole_head = 7.6;
//keyhole slot diameter (mm)
keyhole_slot=4.20;
//keyhole head depth (mm) At this point just needs to be deep enough to penetrate the lower shell.
keyhole_headdepth = 6;
//keyhole slot length (mm)
keyhole_slot_length=15;
//keyhole height adjustment (mm) Closer or further from the top of the sign.
keyhole_height_adjust=-5;

/* [Quality] */
//Quality. Higher number makes for smoother curves for the letters, but also slows down preview and rendering.
$fn = 14;  //14, 28, 56

/* [Hidden] */
//-------------------------------------------------------------------------------
roundfaces=8*round_faces;

//fontname=str(FontName,":style=",textstyle);
fontname=str(FontName,":style=",textstyle,":spacing=",Spacing);

/*

Modified May 2021
By M Starrman
Modified to scale up, minimize top letter layers so LED light can shine thru better, and hang on wall

Original Description:
Rounded Text Box
Version G, August 2018
Written by MC Geisler (mcgenki at gmail dot com)

If you need to store Stuff in words, this is the bubbly way to go.
Have fun!

License: Attribution 4.0 International (CC BY 4.0)

You are free to:
    Share - copy and redistribute the material in any medium or format
    Adapt - remix, transform, and build upon the material
    for any purpose, even commercially.
*/

dummy_cutoutlen=len(textstring)*textsize*1.5;

module writetext(textstr, sizeit)
{
    text(textstr,size=sizeit*.9,font=fontname,halign="center",valign="baseline");
}

function f_scalingwidth(angle) = 1/(1-cos(angle));

module cutoff_circle_segment(radius_original, angle)
difference()
{
    // we will cutoff the flat part of the circle to make later printing easy
    // 1) we cutoff one quarter of the circle
    // 3) we increase the radius so that the cutoff quarter-circle has again the height of "radius"
    height_of_cutoff_quarter=radius_original*sin(angle);
    //echo(radius_original,height_of_cutoff_quarter);
    scalingheight=radius_original/height_of_cutoff_quarter;
 radius=radius_original;//*scalingheight;

    // 2) we shift the quarter towards -x to cutoff the flat part until the right angle is met
    shiftx=radius*cos(angle);
    //echo (shiftx);

 scalingwidth=f_scalingwidth(angle);//radius_original/(radius-shiftx);
    //echo(radius_original,radius,shiftx,scalingwidth);

    scale([scalingwidth,scalingwidth,1])
        translate([-shiftx, 0, 0])
            circle(r = radius, $fn = roundfaces);
    //to check the geometry only:
    //#translate([-2*radius_original,-radius_original,0]) square(2*radius_original);
    //quite big, but only good up to 5 degree angle
    translate([-30*radius_original,-15*radius_original,0]) square(30*radius_original);
    translate([-radius_original,-2*radius_original,0]) square(2*radius_original);
}
//cutoff_circle_segment(bubble, angle);

module halfball(rounding,angle)
{
    rotate_extrude(convexity = 10)
       cutoff_circle_segment(rounding, angle);
}

//translate([0,bubble*2,0]) halfball(bubble,angle);
//halfball2(bubble,angle);

module halfball2(rounding,angle)
{
    difference()
    {
        sphere(r=rounding, $fa=90/4);//, $fs=.1);
        translate([-rounding,-rounding,-2*rounding])
            cube(2*rounding);
    }
}

//BubbleText(textstring, textsize, bubble,angle) ;
module BubbleText(textstr, textsize, rounding,angle)
{
	minkowski()
	{
		linear_extrude(height=textheight,convexity = 32)
			writetext(textstr, textsize);
		halfball(rounding,angle);
	}
}

newcircleradius=f_scalingwidth(angle)*bubble;
newcutoffheight=newcircleradius*sin(angle);
echo("bubble=",bubble,"newcircleradius=",newcircleradius,"newcutoffheight=",newcutoffheight);

module HollowBubbleText(textstr, textsize, bubble, wall,angle)
{
    difference()
    {
        translate([0,0,newcutoffheight])
            BubbleText(textstring,textsize,bubble, angle);
        translate([0,0,wall-.1])
            translate([0,0,newcutoffheight-wall])
                BubbleText(textstring,textsize,bubble-wall,angle);
    }
}
//HollowBubbleText(textstring, textsize, bubble,wall,angle) ;

module CylinderText(textstr, textsize, textheight, rounding)
{
    linear_extrude(height=textheight,convexity = 32)
        minkowski()
        {
            writetext(textstr, textsize);
            circle(r=rounding);
        }
}
//CylinderText(textstring, textsize, textheight, bubble);

module CylinderTextNoHoles(textstr, textsize, textheight, rounding)
{
    linear_extrude(height=textheight,convexity = 32)
    offset(delta=-delta)
    offset(delta=delta)
        minkowski()
        {
            writetext(textstr, textsize);
            circle(r=rounding);
        }
}
//CylinderTextNoHoles(textstring, textsize, textheight, bubble);

module HollowCylinderText(textstr, textsize, bubble, thickness)
{
    difference()
    {
        CylinderText(textstring,textsize,textheight,bubble);
        translate([0,0,-1])
            CylinderTextNoHoles(textstring,textsize,textheight+2,bubble-thickness);
    }
}
//HollowCylinderText(textstring, textsize, bubble, thickness) ;

module BubbleTextBottom(textstr, textsize, bubble,angle)
{
	difference()
	{
		//scale([1,1,-1])
		scale([1,1,-base_scale]) //make the base shorter... rather than trying to design a shorter base
			translate([0,0,-(textheight+2*newcutoffheight)])
				HollowBubbleText(textstr, textsize, bubble,wall,angle);
		translate([-dummy_cutoutlen/2,-dummy_cutoutlen/2,textheight+bubble-.1])
			cube([dummy_cutoutlen,2*dummy_cutoutlen,bubble*3]);
	}
}
//BubbleTextBottom(textstring, textsize, bubble,angle) ;

module BubbleTextTopFlipped(textstr, textsize, bubble,angle)
{
    lidIn=wall+wiggle;
    lidWidth=wall;
    liplength=2*wall;

    rotate([0,180,0]) {
        translate([0,0,-(textheight+newcutoffheight)-newcutoffheight])
        {

			//Writing on top. This added additional layers of text atop the shell. Removed this section for the LED sign version

			difference() {
				union() {
					//rounded top cover
					difference()
					{
						color("blue") //inner text layer under the first layer of text shell. 2nd layer of text.
							HollowBubbleText(textstr, textsize, bubble, wall, angle);

						translate([-dummy_cutoutlen/2,-dummy_cutoutlen/2,0])
							color("white") //cutting off the bottom, to make room for rim
								cube([dummy_cutoutlen,2*dummy_cutoutlen,textheight+newcutoffheight]);

					} //end of difference

					//cover lip to fit onto the storage box
					intersection()
					{
						translate([0,0,newcutoffheight+textheight])
						{
							color("purple") //letter shell under the first two layers. under the blue part. directly above the rim
								HollowCylinderText(textstr, textsize, bubble, lidWidth+lidIn) ;

							translate([0,0,-liplength])
								color("red")  //lower most letter shell, the actual rim
									HollowCylinderText(textstr, textsize, bubble-lidIn, lidWidth) ;
						}

						//intersect with generic shape - makes the rounded lower/outer edge.
						translate([0,0,newcutoffheight])
							color("green") //the outer layer shell. The is the top layer of text.
								BubbleText(textstr, textsize, bubble,angle) ;

					} //end of intersetion

				} //end of union

				//remove layers of text so light can shine/glow through
				translate([0,0,(textheight+newcutoffheight )])
					linear_extrude(height=	newcutoffheight -top_layer_adjustment -top_layer_thickness ,convexity = 32)
						writetext(textstr, textsize);

			} //end of difference

        } //end of translate

	} // end of rotate

}

module keyhole() {
	//cut out for the screw head to enter
	cylinder(r1=keyhole_head/2, r2=keyhole_head/2,h=keyhole_headdepth, center=false);

	//cut out for the screw threads to slide
	translate([-(keyhole_slot/2),0,0])
		cube(size=[keyhole_slot, keyhole_slot_length, keyhole_headdepth], center=false);
}

module keyholes() {
	translate([-keyhole_spacing_left,textsize-keyhole_slot_length-keyhole_head+keyhole_height_adjust,0])
		keyhole();
	translate([keyhole_spacing_right,textsize-keyhole_slot_length-keyhole_head+keyhole_height_adjust,0])
		keyhole();
}

//[bottom_container,top_lid,both]

if (type=="bottom_container" || type=="both")
{
	difference() {
		BubbleTextBottom(textstring, textsize, bubble,angle);
		if (keyhole_boolean) {
			color("black")
			keyholes();
		}
	}
}

if (type=="top_lid" || type=="both")
    translate([0, ( type=="both" ? textsize*1.5+2*bubble+5 : 0 ) ,0])
        BubbleTextTopFlipped(textstring, textsize, bubble,angle);

if (type=="upright")
rotate([90,0,0])
{
    BubbleTextBottom(textstring, textsize, bubble,angle);
    translate([0,0,-(-(textheight+newcutoffheight)-newcutoffheight)])
        rotate([0,-180,0])
			BubbleTextTopFlipped(textstring, textsize, bubble,angle);
}

```


[User]
Okay, so I'm looking to get a parametric pill carousel designed in OpenSCAD. I have a basic idea, but I'd like to be able to customize quite a bit, and I'm not really sure where to start with the code.

The basic idea is a circular carousel with multiple compartments for pills, a lid, and some locking features. I want to be able to specify things like the number of compartments, the overall diameter and height, wall thicknesses, and even label styles. I've seen some designs where the labels can be numbers or days of the week, and that'd be great. Also, I’d like a little bit of clearance between the body and lid.

I also want to include some sort of a notch on the body and a corresponding slot on the lid to help with aligning them correctly, and maybe even some locking features like small bumps or spheres to keep the lid in place once it’s on. It would also be great if you could include some test configurations and a "print config" output mode that lets you print the parts laid out flat on the print bed.

I'd ideally like to avoid using external libraries if possible, keeping it as straightforward as possible. I hope this is clear and you can help.

[Assistant]
YK42_Pill_Carousel.scad:
```
// - Number of segments
N = 7;

// - Outer diameter of body
D = 60;

// - Outside height of body
h = 20;

// - Outer wall thickness
T = 1.6;

// - Inner wall thickness
t = 0.8;

// - Labelling style
label = "day"; //[number, day]

// - Parts to print
part = "print config"; // [bottom:bottom,top:top,assembly:assembly,print config:print config,test:test]

/* [hidden] */
H = h-T;   //inside height
$fn = 80;     //model resolution
cra = 0.8;  //radial clearance
cax = 0.0;  //axial clearance
R = D/2;    //outer radius
r = R-T;    //inner radius
ang = 360/(N+1); //angle per segment
NotchZ = max(H-10, H/2); //height of the notch

unitStoreVol = PI*r*r*H*(ang/360) - r*t*H;
echo(str("Daily Pill Storage Volume=", round(unitStoreVol/1000), "cm^3"));
materialVol = PI*R*R*h-unitStoreVol*N    + PI*R*R*T+PI*D*T*(H-NotchZ);
echo(str("Material Volume=", round(materialVol/1000), "cm^3"));
echo();
echo(str("FileName: Pill Carousel N",N," D",D," H",h," ",part));
echo();

print_part();
//FitConfig();

module print_part() {
    if (part == "bottom") {
		union() {Body(); Labels(); Notches();}
	} else if (part == "top") {
		Lid();
	} else if (part == "assembly") {
		AssemblyConfig();
	} else if (part == "print config") {
		PrintConfig();
	} else if (part == "test") {
		TestSegment();
	} else {
		text("Variable 'part' not valid");
	}
}
//

module Body() {
    //body polygon starting at origin and going CCW
    pBody = [
        [0,       0],           //origin
        [R,       0],           //Bottom outer edge
        [R,       NotchZ-T/2],  //Bottom of notch
        [R-T/2,   NotchZ],      //Center of notch
        [R,       NotchZ+T/2],  //Top of notch
        [R,       H],           //Top outer edge
        [R-T,     H],           //Top inner edge
        [R-T,     T],           //Bottom inner edge
        [0,       T]];          //I/S Center
    rotate_extrude() {
        polygon(pBody);
    }
    //dividers
    for(a=[0:360/(N+1):360]) {
        rotate(a) translate([0, -t/2, 0]) {
            cube([R-t, t, H]);
        }
    }
    //filled segment. N-NE
    intersection() {
        linear_extrude(H)
        polygon([
            [0,0],
            [D,0],
            [D,D*10],
            [R*cos(360/(N+1)), R*sin(360/(N+1))]]);
        cylinder(d=D-T,H);
    }
}

module Lid() {
    //lid polygon starting inside center and going CCW
    pLid = [
        [0,       H+cax],             //inside center
        [R+cra,     H+cax],             //inside radius
        [R+cra,     NotchZ+T/2+cax],    //top of notch
        [R-T/2+cra,   NotchZ],          //point of notch
        [R+T+cra,     NotchZ-T],          //back of notch
        [R+T+cra,     H+cax+T],           //outside radius
        [0,       H+cax+T]];          //outside center

    difference() {
        //body
        rotate_extrude() {
            polygon(pLid);
        }
        //splits
        splitLen = t*3;
        for(a=[0:360/(N+1):360]) {
            rotate(a) translate([R-splitLen, -cra/2]) {
                cube([R,cra,H*2]);
            }
        }
        //opening
        difference() {
            //triangular wedge
            linear_extrude(H*2)
            polygon([
                [0,0],
                [D,0],
                [D,D*10],
                [R*2*cos(360/(N+1)), R*2*sin(360/(N+1))]]);
            //central cylinder
            cylinder(d=R,H*2);
        }
    }
}
//

module Labels() {
    //labels going CW
    textWd = min(3.14159*D/(N+1)*0.8, D/10);
    textHt = min(textWd*1.4, H/2-2);
    textTk = 0.7;
    for(n = [1:N]) {
        ang = 360/(N+1)*(n-0.5+1);
        rotate(ang)
        translate([R-textTk*1.5, 0, 0.5*NotchZ])
        rotate([90,0,90])
        linear_extrude(2*textTk)
        resize([textWd, textHt])
        if(label=="number") {
            CenteredText(n);
        }
        else if(label=="day"){
            if(n%7==1) {CenteredText("M");}
            else if(n%7==2) {CenteredText("T");}
            else if(n%7==3) {CenteredText("W");}
            else if(n%7==4) {CenteredText("T");}
            else if(n%7==5) {CenteredText("F");}
            else if(n%7==6) {CenteredText("S");}
            else if(n%7==0) {CenteredText("S");}
        }

    }
}
//

module CenteredText(string) {
    text(str(string), halign="center",, valign="center", font="Arial");
}

module Notches() {
    //locking notches
    for(a=[0:ang:360])
        rotate(a)
        translate([R-0.3*T,0,NotchZ])
        scale([1,1,2])
        sphere(d=1.5*cra);
}
//

module PrintConfig() {
    union() {Body(); Labels(); Notches();}
    rotate([180,0,0]) translate([D+T*2, 0, -H-t-cra]) {
        Lid();
    }
}
//

module AssemblyConfig() {
    union() {
        union() {Body(); Labels(); Notches();};
        Lid();
    }
}
//

module FitConfig() {
    intersection() {
        AssemblyConfig();
        rotate(-45/2) cube(D);
    }
}
//

module TestSegment() {
    intersection() {
        Body();
        rotate(-ang) translate([0,-t/2]) cube(D);
        rotate(-90) translate([-t/2,0]) cube(D);
    }
}
//
```


[User]
I'd like to create a parametric mask hook design in OpenSCAD. I'm looking for something similar to the `mask_hook.scad` file you have there. It should be customizable using parameters for the band width, band height, thickness, and the number of hooks on one side.

Specifically, the design needs to have a central band with rounded ends, created using `hull()` and circles. There should be hooks that extend out from the top and bottom of the band on both sides, created using `difference()` between a `square()` and a `circle()`. It's also important to have text on the band, with customizable font, size, and content.

I'd prefer it if it was easy to adjust the radius and positioning of those circles that form the rounded ends using parameters. The hook positions along the band should also be easily adjusted through the number of hooks on each side parameter.

I will be using it on a 3D printer, so the generated code should also consider these constraints.

It looks like the `mask_hook.scad` file uses the `linear_extrude`, `square`, `circle`, `difference`, `hull`, `translate`, `mirror`, and `text` commands.

[Assistant]
mask_hook.scad:
```
band_width = 145;
band_height = 24;
thickness = 1;
one_side_hook_numbers = 4;
t = "openhome.cc";
font_name = "Arial Black";
font_size = 6;

mask_hook();

module mask_hook() {
	module hook() {
		difference() {
			square([6, band_height * 0.95], center = true);
			translate([-band_height * 0.625, 0])
				circle(band_height / 1.5, $fn = 12);
		}
	}

    r = band_height * 0.225;
	x = band_width * 0.1425;
	y = band_height / 3.35;
	linear_extrude(thickness) {
		square([band_width, band_height * 0.6], center = true);

		hull() {
			translate([x, y])
				circle(r, $fn = 6);
			translate([-x, y])
				circle(r, $fn = 6);
			translate([-x, -y])
				circle(r, $fn = 6);
			translate([x, -y])
				circle(r, $fn = 6);
		}
	}

	linear_extrude(thickness * 2) {
		for(i = [0:one_side_hook_numbers - 1]) {
			tp = [band_width / 2 - 3 - 10 * i, 0];
			translate(tp)
				hook();

			mirror([1, 0, 0])
			translate(tp)
				hook();
		}
	}

	linear_extrude(thickness * 2)
	    text(t, font = font_name, size = font_size, valign="center", halign = "center");
}
```


[User]
Hey, I'm looking to design a stand for the Vertical Filament Spool Parts Drawer that I found on Thingiverse (it's thing:4854550 if you need to look it up). I want this stand to be fully parametric so I can adjust it as needed, and it needs to include a few key features to improve the original design.

First, the stand should have a circular brim that matches the inner diameter of the filament spool. It should also include a ridge that fits into the spool's center hole, ensuring it's held securely. I'd like the ability to add spokes within this center hole, but this should be optional and adjustable in count. There should also be a central hole in the base for bolting it down.

The stand also needs a base that both lifts the spool off the table a bit and also acts as a bin catch to prevent drawers from spilling. This base should be hexagonal and have outer spokes for additional support. There should be bolt holes around the edge of the base.

I've included the key dimensions I'd like to use as defaults, but everything needs to be adjustable. I'd like to use the following defaults:

*   **Inner Spool Diameter:** 50mm
*   **Outer Spool Diameter:** 200mm
*   **Center Bolt Hole Diameter:** 5.2mm
*   **Brim Width:** 10mm
*   **Ridge Depth:** 6mm
*   **Spoke Count:** 12 (but able to set to 0 for no spokes)
*   **Inner Spoke Width:** 2mm
*   **Base:** True (but able to set to false)
*   **Base Thickness:** 10mm
*   **Base Spoke Width:** 4mm
*   **Base Bolt Hole Diameter:** 5.2mm
*   **Base Height:** 6mm

I think it'd be best if this could be done using a single SCAD file with all the parameters clearly defined at the top. Do you think you can help me with this?

[Assistant]
Vertical_Filament_Spool_Parts_Drawer_Stand.scad:
```
// Diameter of the hole in the center of the spool
Inner_Spool_Diameter = 50;

// Diameter of the outer edge of the spool
Outer_Spool_Diameter = 200;

// Diameter of the hole in the center of the base
Center_Bolt_Hole_Diameter = 5.2;

// How far the brim extends beyond the spool hole
Brim_Width = 10;

// How far inner ridge sits inside spool
Ridge_Depth = 6;

// How many inner spokes (set to 0 if you don't need the center hole)
Spoke_Count = 12; //[0:1:30]

// How wide are the inner spokes
Inner_Spoke_Width = 2;

// Add a base
Base = true;

// Base Thickness (make this wide enough to secure the bins)
Base_Thickness = 10;

// How wide are the base spokes
Base_Spoke_Width = 4;

// Diameter of the holes around the edge of the base
Base_Bolt_Hole_Diameter = 5.2;

// Height the base lifts the spool above the table
Base_Height = 6; //[6:1:18]

// Common variables
tolerance = 0.25 + 0;
inner_spool_radius = Inner_Spool_Diameter/2;
outer_spool_radius = Outer_Spool_Diameter/2;
base_bolt_hole_radius = Base_Bolt_Hole_Diameter / 2;
$fn = 100 + 0;

// Brim Variables
brim_thickness = 1.5 + 0;
brim_radius = inner_spool_radius + tolerance + Brim_Width;

// Ridge Variables
outer_ridge_radus = inner_spool_radius - tolerance;
inner_ridge_radus = outer_ridge_radus - Inner_Spoke_Width;

// Hole variables
center_bolt_hole_radius = Center_Bolt_Hole_Diameter/2;

// Spoke variables
spoke_angle = 360/Spoke_Count;
spoke_thickness = brim_thickness * 2;
circumscribed_padding = 1/cos(30);

// Bin catch variables
bin_catch_inner_radius = outer_spool_radius + tolerance;
max_measurement = Outer_Spool_Diameter*3;
base_bolt_offset = bin_catch_inner_radius + 10;

for(j=[0:1:1]) {
  translate([j * (Outer_Spool_Diameter + 50), 0, 0]) {
    mirror(v= [j, 0, 0] ) {
      union() {
        difference() {
          union() {
            difference() {
              union() {

                // Brim
                translate([0, 0, 0]) {
                  rotate(90, [1,0,0]) {
                      cylinder(brim_thickness, brim_radius, brim_radius);
                  }
                }

                // Ridge
                translate([0, -brim_thickness, 0]) {
                  rotate(90, [1,0,0]) {
                    cylinder(Ridge_Depth, outer_ridge_radus, outer_ridge_radus, false);
                  }
                }

              }

              // Cut out large center hole
              translate([0, brim_thickness, 0]) {
                rotate(90, [1,0,0]) {
                  cylinder(max_measurement, inner_ridge_radus, inner_ridge_radus);
                }
              }

            }

            // Internal pokes
            intersection() {
              translate([0, 0, 0]) {
                rotate(90, [1,0,0]) {
                  cylinder(spoke_thickness, outer_ridge_radus, outer_ridge_radus, false);
                }
              }
              for(i=[1:1:Spoke_Count]) {
                rotate(spoke_angle * i, [0,1,0]) {
                  translate([-Inner_Spoke_Width/2, -max_measurement, 0]) {
                    cube([Inner_Spoke_Width, max_measurement, brim_radius]);
                  }
                }
              }
            }

            // Center hole ring
            if (Spoke_Count > 0) {
              translate([0, 0, 0]) {
                rotate(90, [1,0,0]) {
                  rotate(30, [0,0,1]) {
                    cylinder(spoke_thickness, center_bolt_hole_radius + Inner_Spoke_Width*2, center_bolt_hole_radius + Inner_Spoke_Width*2);
                  }
                }
              }
            }

          }

          // Center hole
          if (Spoke_Count > 0) {
            translate([0, 1, 0]) {
              rotate(90, [1,0,0]) {
                rotate(30, [0,0,1]) {
                  cylinder(max_measurement, center_bolt_hole_radius, center_bolt_hole_radius);
                }
              }
            }
          }

        }

        // Bin catch
        if (Base) {
          difference() {
            // Hexagon base
            union() {
              difference() {
                rotate(90, [1,0,0]) {
                  rotate(0, [0,0,1]) {
                    cylinder(Base_Thickness, (bin_catch_inner_radius) * circumscribed_padding + Base_Height, (bin_catch_inner_radius) * circumscribed_padding + Base_Height, $fn=6);
                  }
                }
                translate([0, 1, 0]) {
                  rotate(90, [1,0,0]) {
                    cylinder(Base_Thickness + 4, bin_catch_inner_radius + 2, bin_catch_inner_radius + 4, false);
                  }
                }
              }

              // Outer spokes
              translate([0, -brim_thickness/2, 0]) {
                rotate(30, [0,1,0]) {
                  cube([bin_catch_inner_radius*2 + 5, brim_thickness, Base_Spoke_Width], true);
                }
                rotate(45, [0,1,0]) {
                  cube([bin_catch_inner_radius*2 + 5, brim_thickness, Base_Spoke_Width], true);
                }
                rotate(60, [0,1,0]) {
                  cube([bin_catch_inner_radius*2 + 5, brim_thickness, Base_Spoke_Width], true);
                }
                rotate(75, [0,1,0]) {
                  cube([bin_catch_inner_radius*2 + 5, brim_thickness, Base_Spoke_Width], true);
                }
                rotate(90, [0,1,0]) {
                  cube([bin_catch_inner_radius*2 + 5, brim_thickness, Base_Spoke_Width], true);
                }
                rotate(105, [0,1,0]) {
                  cube([bin_catch_inner_radius*2 + 5, brim_thickness, Base_Spoke_Width], true);
                }
                rotate(120, [0,1,0]) {
                  cube([bin_catch_inner_radius*2 + 5, brim_thickness, Base_Spoke_Width], true);
                }
                rotate(135, [0,1,0]) {
                  cube([bin_catch_inner_radius*2 + 5, brim_thickness, Base_Spoke_Width], true);
                }
                rotate(150, [0,1,0]) {
                  cube([bin_catch_inner_radius*2 + 5, brim_thickness, Base_Spoke_Width], true);
                }
                rotate(165, [0,1,0]) {
                  cube([bin_catch_inner_radius*2 + 5, brim_thickness, Base_Spoke_Width], true);
                }
                rotate(180, [0,1,0]) {
                  cube([bin_catch_inner_radius*2 + 5, brim_thickness, Base_Spoke_Width], true);
                }
                rotate(195, [0,1,0]) {
                  cube([bin_catch_inner_radius*2 + 5, brim_thickness, Base_Spoke_Width], true);
                }
              }

            }

            // Slice off top of the base
            rotate(15, [0,1,0]) {
              translate([0, 0, max_measurement/2]) {
                cube([max_measurement, max_measurement, max_measurement], true);
              }
            }

            // Punch out hole from the center of the base
            rotate(90, [1,0,0]) {
              cylinder(Base_Thickness, inner_ridge_radus, inner_ridge_radus, true);
            }

            // Punch out bolt holes from the edge of the base
            rotate(60, [0,1,0]) {
              translate([base_bolt_offset, 0, 0]) {
                rotate(90, [1,0,0]) {
                  cylinder(max_measurement, base_bolt_hole_radius, base_bolt_hole_radius, true);
                }
              }
            }
            rotate(120, [0,1,0]) {
              translate([base_bolt_offset, 0, 0]) {
                rotate(90, [1,0,0]) {
                  cylinder(max_measurement, base_bolt_hole_radius, base_bolt_hole_radius, true);
                }
              }
            }
            rotate(180, [0,1,0]) {
              translate([base_bolt_offset, 0, 0]) {
                rotate(90, [1,0,0]) {
                  cylinder(max_measurement, base_bolt_hole_radius, base_bolt_hole_radius, true);
                }
              }
            }

          }
        }
      }
    }
  }
}

```
Vertical_Filament_Spool_Parts_Drawer_Stand_version_1_archived.scad:
```
// Diameter of the hole in the center of the spool
Inner_Spool_Diameter = 50;

// Diameter of the outer edge of the spool
Outer_Spool_Diameter = 200;

// Diameter of the hole in the center of the base
Center_Bolt_Hole_Diameter = 5.2;

// How far the brim extends beyond the spool hole
Brim_Width = 10;

// How far inner ridge sits inside spool
Ridge_Depth = 6;

// How many inner spokes (set to 0 if you don't need the center hole)
Spoke_Count = 12; //[0:1:30]

// How wide are the inner spokes
Inner_Spoke_Width = 2;

// Add a base
Base = true;

// Base Thickness (make this wide enough to secure the bins)
Base_Thickness = 10;

// How wide are the base spokes
Base_Spoke_Width = 4;

// Diameter of the holes around the edge of the base
Base_Bolt_Hole_Diameter = 5.2;

// Common variables
tolerance = 0.25 + 0;
inner_spool_radius = Inner_Spool_Diameter/2;
outer_spool_radius = Outer_Spool_Diameter/2;
base_bolt_hole_radius = Base_Bolt_Hole_Diameter / 2;
$fn = 100 + 0;

// Brim Variables
brim_thickness = 1.5 + 0;
brim_radius = inner_spool_radius + tolerance + Brim_Width;

// Ridge Variables
outer_ridge_radus = inner_spool_radius - tolerance;
inner_ridge_radus = outer_ridge_radus - Inner_Spoke_Width;

// Hole variables
center_bolt_hole_radius = Center_Bolt_Hole_Diameter/2;

// Spoke variables
spoke_angle = 360/Spoke_Count;
spoke_thickness = brim_thickness * 2;
circumscribed_padding = 1/cos(30);

// Bin catch variables
bin_catch_inner_radius = outer_spool_radius + tolerance;
max_measurement = Outer_Spool_Diameter*3;
base_bolt_offset = bin_catch_inner_radius + 10;

for(j=[0:1:1]) {
  translate([j * (Outer_Spool_Diameter + 50), 0, 0]) {
    mirror(v= [j, 0, 0] ) {
      union() {
        difference() {
          union() {
            difference() {
              union() {

                // Brim
                translate([0, 0, 0]) {
                  rotate(90, [1,0,0]) {
                      cylinder(brim_thickness, brim_radius, brim_radius);
                  }
                }

                // Ridge
                translate([0, -brim_thickness, 0]) {
                  rotate(90, [1,0,0]) {
                    cylinder(Ridge_Depth, outer_ridge_radus, outer_ridge_radus, false);
                  }
                }

              }

              // Cut out large center hole
              translate([0, brim_thickness, 0]) {
                rotate(90, [1,0,0]) {
                  cylinder(max_measurement, inner_ridge_radus, inner_ridge_radus);
                }
              }

            }

            // Internal pokes
            intersection() {
              translate([0, 0, 0]) {
                rotate(90, [1,0,0]) {
                  cylinder(spoke_thickness, outer_ridge_radus, outer_ridge_radus, false);
                }
              }
              for(i=[1:1:Spoke_Count]) {
                rotate(spoke_angle * i, [0,1,0]) {
                  translate([-Inner_Spoke_Width/2, -max_measurement, 0]) {
                    cube([Inner_Spoke_Width, max_measurement, brim_radius]);
                  }
                }
              }
            }

            // Center hole ring
            if (Spoke_Count > 0) {
              translate([0, 0, 0]) {
                rotate(90, [1,0,0]) {
                  rotate(30, [0,0,1]) {
                    cylinder(spoke_thickness, center_bolt_hole_radius + Inner_Spoke_Width*2, center_bolt_hole_radius + Inner_Spoke_Width*2);
                  }
                }
              }
            }

          }

          // Center hole
          if (Spoke_Count > 0) {
            translate([0, 1, 0]) {
              rotate(90, [1,0,0]) {
                rotate(30, [0,0,1]) {
                  cylinder(max_measurement, center_bolt_hole_radius, center_bolt_hole_radius);
                }
              }
            }
          }

        }

        // Bin catch
        if (Base) {
          difference() {
            // Hexagon base
            union() {
              difference() {
                rotate(90, [1,0,0]) {
                  rotate(0, [0,0,1]) {
                    cylinder(Base_Thickness, (bin_catch_inner_radius) * circumscribed_padding + 6, (bin_catch_inner_radius) * circumscribed_padding + 6, $fn=6);
                  }
                }
                translate([0, 1, 0]) {
                  rotate(90, [1,0,0]) {
                    cylinder(Base_Thickness + 4, bin_catch_inner_radius + 2, bin_catch_inner_radius + 4, false);
                  }
                }
              }

              // Outer spokes
              translate([0, -brim_thickness/2, 0]) {
                rotate(30, [0,1,0]) {
                  cube([bin_catch_inner_radius*2 + 5, brim_thickness, Base_Spoke_Width], true);
                }
                rotate(45, [0,1,0]) {
                  cube([bin_catch_inner_radius*2 + 5, brim_thickness, Base_Spoke_Width], true);
                }
                rotate(60, [0,1,0]) {
                  cube([bin_catch_inner_radius*2 + 5, brim_thickness, Base_Spoke_Width], true);
                }
                rotate(75, [0,1,0]) {
                  cube([bin_catch_inner_radius*2 + 5, brim_thickness, Base_Spoke_Width], true);
                }
                rotate(90, [0,1,0]) {
                  cube([bin_catch_inner_radius*2 + 5, brim_thickness, Base_Spoke_Width], true);
                }
                rotate(105, [0,1,0]) {
                  cube([bin_catch_inner_radius*2 + 5, brim_thickness, Base_Spoke_Width], true);
                }
                rotate(120, [0,1,0]) {
                  cube([bin_catch_inner_radius*2 + 5, brim_thickness, Base_Spoke_Width], true);
                }
                rotate(135, [0,1,0]) {
                  cube([bin_catch_inner_radius*2 + 5, brim_thickness, Base_Spoke_Width], true);
                }
                rotate(150, [0,1,0]) {
                  cube([bin_catch_inner_radius*2 + 5, brim_thickness, Base_Spoke_Width], true);
                }
                rotate(165, [0,1,0]) {
                  cube([bin_catch_inner_radius*2 + 5, brim_thickness, Base_Spoke_Width], true);
                }
                rotate(180, [0,1,0]) {
                  cube([bin_catch_inner_radius*2 + 5, brim_thickness, Base_Spoke_Width], true);
                }
                rotate(195, [0,1,0]) {
                  cube([bin_catch_inner_radius*2 + 5, brim_thickness, Base_Spoke_Width], true);
                }
              }

            }

            // Slice off top of the base
            rotate(15, [0,1,0]) {
              translate([0, 0, max_measurement/2]) {
                cube([max_measurement, max_measurement, max_measurement], true);
              }
            }

            // Punch out hole from the center of the base
            rotate(90, [1,0,0]) {
              cylinder(Base_Thickness, inner_ridge_radus, inner_ridge_radus, true);
            }

            // Punch out bolt holes from the edge of the base
            rotate(60, [0,1,0]) {
              translate([base_bolt_offset, 0, 0]) {
                rotate(90, [1,0,0]) {
                  cylinder(max_measurement, base_bolt_hole_radius, base_bolt_hole_radius, true);
                }
              }
            }
            rotate(120, [0,1,0]) {
              translate([base_bolt_offset, 0, 0]) {
                rotate(90, [1,0,0]) {
                  cylinder(max_measurement, base_bolt_hole_radius, base_bolt_hole_radius, true);
                }
              }
            }
            rotate(180, [0,1,0]) {
              translate([base_bolt_offset, 0, 0]) {
                rotate(90, [1,0,0]) {
                  cylinder(max_measurement, base_bolt_hole_radius, base_bolt_hole_radius, true);
                }
              }
            }

          }
        }
      }
    }
  }
}

```


[User]
I'm looking to create a customizable hook that can clip into holes, specifically the 6.5mm holes found in IKEA's Tisken series, and I'd like the design to be parametric so I can adjust it for different situations. I've got an existing design (attached as TISKEN_hook.scad, but I want you to make a brand new one, don't just modify the attached).

The primary requirements are:

1.  **Clip Mechanism:** The hook needs to have a secure clipping mechanism that fits snugly into a circular hole. It should be adjustable to fit different diameter holes, but 6.5mm should be a default. Let's call the hole diameter `hole_diameter` and use 6.5mm as the default value, and the radius `hole_radius` which would default to 3.25mm. There needs to be a `clip_width` which defaults to 1.0mm which controls how far the "hooks" at the end of the clip mechanism extend, as well as how thick they are, because they get cut out of the cylinder.
2.  **Hook Shape:** The hook should have a rounded shape, not a sharp one, that allows it to hold things reliably. The curve of the hook needs to be adjustable, I was thinking like a list of points that are used to create a 2D path, then a sphere is run along it. There should be a variable called `thickness` that controls the width and diameter of the spheres used. This should default to the hole_radius I mentioned above, which is 3.25mm.
3.  **Top Anchor:** The top portion of the hook should transition smoothly into the clipping mechanism. I want a `top_y` variable that determines where the circular clipping mechanism meets the top of the hook, so it is customizable, and defaults to 10 times the thickness.
4.  **Clearance:** I want to make sure there is a clearance cut at the top of the hook to prevent it from being too tight of a fit with the surface it clips into, and another one on the bottom, and I want the same cut on the back side of the clip so that it can fit into the holes.

I think it would be useful if there was a little insert that could go inside the clip, to prevent it from being pulled out, but that's less of a priority.

Could you design the parametric OpenSCAD file(s) for this, ensuring that I can easily change all of the described parameters? The design should be as compact and simple as possible to minimize print time and materials. I do not need to use any external libraries.

[Assistant]
TISKEN_hook.scad:
```
/* [config] */
// radius of hole (tisken has 6.5mm diameter holes)
thickness = 3.25; //
// clip strength in mm
clip_width=1.0;

/* [hidden] */
top_y = 10*thickness;

// distance between two points or origin and a point
function distance(a, b=[0,0,0]) = sqrt(pow(a.x-b.x, 2)+pow(a.y-b.y, 2)+pow((a.z?a.z:0)-(b.z?b.z:0), 2));
// normalize vector
function normalize(a) = concat([a.x/distance(a), a.y/distance(a)], len(a) < 3 ? [] : [a.z/distance(a)]);
// cross product of 3d vectors
function xproduct(a, b) = [
    a.y*b.z-a.z*b.y,
    a.z*b.x-a.x*b.z,
    a.x*b.y-a.y*b.x
];
// rotate vector (point) around origin in direction b
function rotateV(a, theta, b) = cos(theta) * a + sin(theta) * xproduct(normalize(xproduct(a, b)), a);
// rotate clockwise around z axis
function rotateZ(a, theta) = rotateV([a.x, a.y, 0], theta, [a.y, -a.x, 0])+[0, 0, a.z];
// reverse list
function reverse(list) = [for (i = [len(list)-1:-1:0]) list[i]];

// follow list of points https://www.raphaelluckom.com/posts/bezier_curves.html
module piecewise_join(points) {
  for (n=[1:len(points) - 2]) {
    hull() {
      translate(points[n-1]) children(0);
      translate(points[n]) children(0);
    }
    hull() {
      translate(points[n+1]) children(0);
      translate(points[n]) children(0);
    }
  }
}
// create list of points on circle
function circlePoints(count, radius) = reverse([
    for (t=[0:180/count:180+180/count]) rotateZ([-radius, 0, 0], -t)
]);

// all hook layout points
points = concat([
      [0, top_y, 0],
      [0, 7*thickness, 0]
    ],
    circlePoints(round(4*thickness), 3*thickness)
);

// build the hook
difference() {
    union() {
        difference() {
            // main hook
            piecewise_join(points) sphere(thickness, $fn=30);
            // cut of top end half-sphere
            translate([0, top_y+thickness, 0]) cube(thickness*2, true);
        }

        // add small height to improve angle slice
        translate([0, top_y, 0]) rotate([-90, 0, 0]) cylinder(clip_width*0.4, thickness+clip_width, thickness+clip_width);
        // clip cone
        translate([0, top_y+clip_width*0.4, 0]) rotate([-90, 0, 0]) cylinder(thickness*0.66, thickness+clip_width, thickness-clip_width);
    }
    // flat top
    translate([0,0,thickness+thickness/4]) cube([(top_y+thickness)*2, (top_y+thickness)*2, thickness], true);
    // flat bottom
    translate([0,0,-thickness-thickness/4]) cube([(top_y+thickness)*2, (top_y+thickness)*2, thickness], true);
    // hollow clip to be insertable
    translate([0, top_y, 0]) cube([2*clip_width*0.95, thickness*4, thickness*2 ], true);
}

// the fitting clip insert to make the clip unpullable (* disabled)
*cube([2*clip_width*0.95, thickness*2 + clip_width*0.4 + thickness*0.66, thickness*1.5 ], true);

```


[User]
I'd like to design a fin guide for model rockets, similar to the one I've been using. I'm attaching the code for reference, but I'd like the new design to be fully parametric, built from scratch, and I'd like to use BOSL2 library for it. I need to be able to specify the following parameters:

*   **Tube Outer Diameter:** The outer diameter of the rocket body tube in millimeters.
*   **Tube Clearance:** The gap between the guide and the tube, in millimeters. This allows for a snug fit but still allows the guide to slide.
*   **Number of Fins:** How many fins the rocket will have.
*   **Fin Thickness:** The thickness of the fins, in millimeters.
*   **Guide Span:** The length of the fin guide along the tube, in millimeters.
*   **Guide Height:** The height of the guide walls, in millimeters.
*   **Guide Wall Thickness:** The thickness of the guide's walls, in millimeters.
*   **Guide Foot Thickness:** The thickness of the guide's base (foot), in millimeters.
*   **Guide Foot Width:** The width of the guide's base (foot), in millimeters.
*   **Include End Flange:** A boolean value to toggle whether to include the flange at the end of the guide, where the fins will be glued to the guide.
*   **End Foot Thickness:** The thickness of the end flange (if included), in millimeters.

I'd like the design to create a guide that clamps around the tube and provides slots for each fin at the correct spacing and angle. I also want to be able to control the overall size of the guide, especially the 'foot' that extends at the bottom, and the optional end flange. Please ensure the fin slots are sized appropriately to match the fin thickness. Also, remember I'd like to use the BOSL2 library. Thanks!

[Assistant]
No_Limit_Fin_Guide.scad:
```
/*

Based on the original SCAD file by garyacrowellsr at https://www.thingiverse.com/thing:4292667.
All drop-down menus and slider controls (except Tube Clearance mm) have been removed and replaced with open-ended fields to customize as you please.
Note: If your fin guides are not showing up on a larger outer diameter tube, increase the Guide Span mm until they begin showing again.
Original documentation remains below this line.

=============================================================================================

Fin positioning guides like this are not new, but it was done in a nice printed impelementation
by Dave Juliano in this thread on TRF:
https://www.rocketryforum.com/threads/3d-printer-plunge.146985/page-4

I liked it, so I stole it, with the OpenSCAD Customizer implementation here.

Usage is pretty much self-explanitory, and the best way to figure it out is just to play around
with the slider controls a bit.  See the blurb below, if you haven't used the Customizer before.

One difference I've made from the original is the addition of an optional flange at the 'fin tips'
of the guide, where I think there might be a weakness.  Also, since the sections are only held
together by a small web, I've included the option to thicken this web, though it might interfere
with the placement of the guide.

=============================================================================================
=================================  OpenSCAD Customizer ======================================
This file has been created with the intention to use the OpenSCAD 'Customizer', which allows
the use of Windows-style selection tools to set parameters of the component.  The use of this
feature requires the following steps:

1.  You must be using the OpenScad 'Development Snapshot' version, available at:
    http://www.openscad.org/downloads.html
    Scroll down to Development Snapshots,  use version OperSCAD 2018.09.05 or later.

2.  Open this file with OpenSCAD.

3.  In the OpenSCAD [Edit] menu, select [Preferences] then open tab [Features], check
    [Customizer], then close the window when the check is shown.

4.  In the OpenSCAD [View] menu, uncheck the option [Hide Customizer].  The Customizer
    window should open at the right side of the screen.

5.  At the top of the Customizer window, check 'Automatic Preview' and select 'Show Details'
    in the dropdown box.

6.  If you are comfortable with the instructions above, then also in the [View] menu, you can
	check the option [Hide editor], which will allow the full screen to view the model.  You
	can also check to [Hide Console].

*/

/* [Fin Guide Parameters] */
// Body Tube Diameter
//Tube_Diameter_mm = 25;

Tube_Outer_Diameter_mm=24.8;

// Guide-to-Tube Clearance
Tube_Clearance_mm = 0.4; // [0:0.1:1.0]

Number_of_Fins = 3;

Fin_Thickness_mm = 3;

Guide_Span_mm = 25;

Guide_Height_mm = 15;

Guide_Wall_Thickness_mm = 2;

Guide_Foot_Thickness_mm = 2;

Guide_Foot_Width_mm = 4;
//
Include_End_Flange = true;
End_Foot_Thickness_mm = 4;

/* [Hidden] */
$fn = 180;
Guide_Tube_ID_mm = Tube_Outer_Diameter_mm + 2*Tube_Clearance_mm;

difference() {
	union () {
		// basic tube
		cylinder (h = Guide_Height_mm, d = Guide_Tube_ID_mm + 2*Guide_Wall_Thickness_mm);
		// foot cylinder
		cylinder (h = Guide_Foot_Thickness_mm,
			d = Guide_Tube_ID_mm + 2*Guide_Wall_Thickness_mm + 2*Guide_Foot_Width_mm);
		for (j = [0 : 360/Number_of_Fins : 360-360/Number_of_Fins]) {
			rotate (a = [0, 0, j]) {
				// fin walls
				hull () {
					translate ([Guide_Span_mm/2, 0, Guide_Height_mm/4])
						cube (size = [Guide_Span_mm, Fin_Thickness_mm + 2*Guide_Wall_Thickness_mm,
							Guide_Height_mm/2], center = true);
					translate ([Guide_Span_mm - Guide_Foot_Width_mm/2, 0,
						Guide_Height_mm - Guide_Foot_Width_mm/2])
						rotate (a = [90, 0, 0])
						cylinder (h = Fin_Thickness_mm + 2*Guide_Wall_Thickness_mm,
							d = Guide_Foot_Width_mm, center = true);
					translate ([0, 0, Guide_Height_mm - Guide_Foot_Width_mm/2])
						rotate (a = [90, 0, 0])
						cylinder (h = Fin_Thickness_mm + 2*Guide_Wall_Thickness_mm,
							d = Guide_Foot_Width_mm, center = true);
				}
				// fin foot
				hull () {
					translate ([Guide_Span_mm/2 + Guide_Foot_Width_mm/2, 0, Guide_Foot_Thickness_mm/2])
						cube (size = [Guide_Span_mm,
							Fin_Thickness_mm + 2*Guide_Wall_Thickness_mm + 2*Guide_Foot_Width_mm, Guide_Foot_Thickness_mm],
							center = true);
					translate ([Guide_Span_mm + Guide_Foot_Width_mm - Guide_Foot_Width_mm/4,
						Fin_Thickness_mm/2 + Guide_Wall_Thickness_mm + Guide_Foot_Width_mm -
						Guide_Foot_Width_mm/2, 0])
						cylinder (h = Guide_Foot_Thickness_mm, d = Guide_Foot_Width_mm);
					translate ([Guide_Span_mm + Guide_Foot_Width_mm - Guide_Foot_Width_mm/4,
						-(Fin_Thickness_mm/2 + Guide_Wall_Thickness_mm + Guide_Foot_Width_mm -
						Guide_Foot_Width_mm/2), 0])
						cylinder (h = Guide_Foot_Thickness_mm, d = Guide_Foot_Width_mm);
				}

				// end web
				if (Include_End_Flange == true ) {
					difference() {
						hull () {
							translate ([Guide_Span_mm + Guide_Foot_Width_mm - Guide_Foot_Width_mm/4,
								Fin_Thickness_mm/2 + Guide_Wall_Thickness_mm + Guide_Foot_Width_mm -
								Guide_Foot_Width_mm/2, 0])
								cylinder (h = Guide_Foot_Thickness_mm, d = Guide_Foot_Width_mm);
							translate ([Guide_Span_mm + Guide_Foot_Width_mm - Guide_Foot_Width_mm/4,
								-(Fin_Thickness_mm/2 + Guide_Wall_Thickness_mm + Guide_Foot_Width_mm -
								Guide_Foot_Width_mm/2), 0])
								cylinder (h = Guide_Foot_Thickness_mm, d = Guide_Foot_Width_mm);
							translate ([Guide_Span_mm - Guide_Foot_Width_mm/2, 0,
								Guide_Height_mm - Guide_Foot_Width_mm/2])
								rotate (a = [90, 0, 0])
								cylinder (h = Fin_Thickness_mm + 2*Guide_Wall_Thickness_mm,
									d = Guide_Foot_Width_mm, center = true);
						}
						translate ([Guide_Span_mm, 0, Guide_Height_mm/2+End_Foot_Thickness_mm])
							cube (size = [Guide_Span_mm, Fin_Thickness_mm, Guide_Height_mm],
							center = true);
					}
				}
			}
		}
	}
	// subtract center tube
	cylinder (h = 3*Guide_Height_mm, d = Guide_Tube_ID_mm, center = true);
	// subtract fins
	for (j = [0 : 360/Number_of_Fins : 360-360/Number_of_Fins]) {
		rotate (a = [0, 0, j]) {
			translate ([Guide_Span_mm/2 + 0.01, 0, 0])
			cube (size = [Guide_Span_mm, Fin_Thickness_mm, 3*Guide_Height_mm], center = true);
		}
	}
}

```


[User]
Hi, I'm looking to get a replacement knob designed for my Ryobi Pro Cut II line trimmer. The original knob wore out, and I want to 3D print a replacement. I've included the dimensions and some key features in the description and SCAD file I'm attaching.

Basically, I need a cylindrical knob with a few distinct features. It should have a wider base tapering to a slightly smaller diameter top with a knurled pattern around the outside. The top needs a recessed hex nut cavity for a bolt, and on the underside, there should be a recessed section as well. Inside, it should have internal support webs. Finally, there should be some small nubs on the top to retain the bolt head.

Here's a breakdown of the key dimensions, all in millimeters:

*   **Hex Nut Recess:**
    *   Diameter (across points): 15.0
    *   Depth: 12.6
*   **Bolt Hole Diameter:** 9.2
*   **Knob Dimensions:**
    *   Base Diameter: 44.48
    *   Top Diameter: 43.22
    *   Top Height: 16.92
    *   Side Height: 11.26
*   **Knurls:**
    *   Number: 16
    *   Width: 2.5
    *   Height: 1
*   **Internal Webs:**
    *   Number: 6
    *   Wall Thickness: 2.5

I'd like the design to be parametric so I can adjust these measurements if needed in the future. I would need an OpenSCAD file to generate the model, and it should be designed to be 3D printed. I want to print this in PETG with 100% infill, so strength is important.

Also, it would be great if the code was well commented.

I've attached the original code that I used to create it as a reference. Let me know if you have any questions or need further clarification. I would expect the use of standard OpenSCAD libraries for this.

[Assistant]
line_trimmer_knob.scad:
```
// Lawn Trimmer / Whipper Snipper / Strimmer / string trimmer / Weed Whacker knob
// To suit Ryobi Pro Cut II trimmer head
// Print at 100% infill only. PETG seems to work well.
//
// CAUTION: power tools can be very dangerous. WEAR EYE, EAR AND HEAD PROTECTION AT ALL TIMES.
// This model is not deemed fit-for-purpose for anything. USE ENTIRELY AT YOUR OWN RISK.
//
// Written by Steve Malikoff in Brisbane, Australia  May 2020

// All dimensions in mm

HEX_NUT_ACROSS_POINTS_DIA = 15.0;
HEX_NUT_RECESS_HEIGHT = 12.6;
BOLT_HOLE_DIA = 9.2;

KNOB_BASE_DIA = 44.48;
KNOB_TOP_DIA = 43.22;
KNOB_TOP_HEIGHT=16.92;
KNOB_SIDE_HEIGHT = 11.26;

KNURLS = 16;
KNURL_WIDTH = 2.5;
KNURL_ALTITUDE = 1;

WEBS = 6;
WALL_THICK = 2.5;

module CustomiserStopper() {}	// Stop Customiser looking past here

FACETS=123;
$fn = FACETS;

// Generate the model proper
LineTrimmerKnob();
//Cutaway();	// Test look at inside construction

module Cutaway()
{
    difference()
    {
        LineTrimmerKnob();
        cube([200,200,200]);
    }
}

module LineTrimmerKnob()
{
    difference()
    {
        KnobBody();
        HexNutRecess();
        UndersideRecess();
        cylinder(r=15,h=1);
    }
    Webs();
	ScrewRetainerNubs();
}

module KnobBody()
{
    knurlAngleSeparation = 360 / KNURLS;
    cylinder(d1=KNOB_BASE_DIA, d2=KNOB_TOP_DIA, h=KNOB_SIDE_HEIGHT);
    for (k = [1 : KNURLS])
        rotate(k * knurlAngleSeparation)
            translate([KNOB_BASE_DIA/2, -KNURL_WIDTH/2, 0])
                rotate([0,-4,0])
                cube([KNURL_ALTITUDE, KNURL_WIDTH, 11.26]);
    // thick top
    translate([0,0,KNOB_SIDE_HEIGHT])
        cylinder(d1=KNOB_TOP_DIA, d2=KNOB_TOP_DIA - 9, h=KNOB_TOP_HEIGHT-KNOB_SIDE_HEIGHT);
}

module HexNutRecess()
{
    translate([0,0,KNOB_TOP_HEIGHT - HEX_NUT_RECESS_HEIGHT])
        cylinder(d=HEX_NUT_ACROSS_POINTS_DIA, h=HEX_NUT_RECESS_HEIGHT, $fn=6);
    cylinder(d=BOLT_HOLE_DIA, h=5, $fn=FACETS);
}

module UndersideRecess()
{
    difference()
    {
        cylinder(r1=KNOB_BASE_DIA/2 - WALL_THICK, r2=KNOB_TOP_DIA/2 - WALL_THICK, h=KNOB_SIDE_HEIGHT - WALL_THICK);
        cylinder(d=BOLT_HOLE_DIA + 4*WALL_THICK, h=KNOB_SIDE_HEIGHT, $fn=FACETS);
    }

}

module Webs()
{
    webAngleSeparation = 360 / WEBS;
	webAtBossPos = (BOLT_HOLE_DIA + 4*WALL_THICK)/2 - 1;
	webAtOuterPos = KNOB_BASE_DIA/2 - WALL_THICK - webAtBossPos;
    for (k = [1 : WEBS])
        rotate(k * webAngleSeparation)
            translate([webAtBossPos, -WALL_THICK/2, 1])
                cube([webAtOuterPos, WALL_THICK, KNOB_SIDE_HEIGHT]);
}

module ScrewRetainerNubs()
{
	NubDia = 3;
    for (k = [0 : 3])
        rotate(k * 120 + 30)
	translate([NubDia + 4.2,0,KNOB_TOP_HEIGHT - NubDia])
			sphere(d=NubDia);
}

```