[User]
Hi there, I'm looking for an OpenSCAD design for a highly customizable French cleat tool holder. I'd like it to be parametric so I can adjust a wide variety of dimensions and features. I've seen a few designs out there, but they haven't been flexible enough for my needs.

Here's what I'm envisioning:

**Core Functionality:**

*   **French Cleat Attachment:** The design needs to have the characteristic angled cleat shape on the back that fits onto standard French cleat strips. The angle should be adjustable, although I'd like 45 degrees to be the default.
*   **Shelves:** I want to be able to include or exclude top and bottom shelves as needed.
*   **Tool Holes:** The shelves should have holes for holding tools. The hole shape is a tilted ellipse, allowing for different diameters based on tool size. Both the major and minor axes of this ellipse and tilt angle should be adjustable, as well as their spacing and depth. I want an option to have full or half holes on the bottom shelf.
*   **Text Labels:** I'd like to be able to add text labels, both a center label on the top and per-column labels centered over each hole. The text size should be configurable.

**Parameters:**

I need to be able to control the following dimensions and features:

*   **Cleat Dimensions:** Height, depth, and thickness of the French cleat section.
*   **Shelf Depth:** The overall depth of the holder shelves, and an option to fix a shelf depth and spacing rather than the other way around
*   **Shelf Height:**  Height of the top shelf.
*   **Thickness:** Back thickness and shelf thickness, with options for roundovers and fillets.
*   **Shelf Inclusion:** Booleans to control whether a top and/or bottom shelf is included.
*  **Bottom Hole Type:** Select between no holes, full holes, or half holes on the bottom shelf
*   **Hole Dimensions:** Depth axis, width axis, and angle of the ellipse.
*   **Hole Layout:** Number of columns and rows of holes.
*   **Hole Spacing:** Either spacing between the centers of the holes or a fixed spacing between the edges of the holes.
*   **Text Size:** Size of the text labels.
*   **Label Text:** The overall center label and a vector of column labels.

**Libraries:**

I'd prefer this design to be as independent as possible, but it would be great if it could use functions from BOSL if possible (not the whole library). I will not need the entire library just the following:

*   `hull()`
*   `offset()`
*   `linear_extrude()`
*   `rotate()`
*   `translate()`
*   `union()`
*   `difference()`
*   `square()`
*   `text()`
*   `circle()`
*   `scale()`

That's pretty much it. I'm hoping you can create a flexible and robust design based on these requirements. Let me know if you need any clarification.

[Assistant]
cleatToolHolder.scad:
```
/*
 * Configurable French Cleat Tool Holder
 *
 * by 4iqvmk, 2018-07-05
 * https://www.thingiverse.com/4iqvmk/about
 *
 * Licenced under Creative Commons Attribution - Share Alike 4.0
 *
 * version 1.00 - initial version
*/

// Note: default parameters will make a holder for three 1 oz bottles of Zap CA

/* [Hidden] */

inch2mm = 0.3048/12*1000;
mm2inch = 12/0.3048/1000;
$fn=60;

// preview[view:south west, tilt:top diagonal]

/* [Parameters] */

// mm
cleatHeight = 75; // [0:1:200]

// mm
cleatDepth = 15; // [0:1:30]

// mm
cleatThickness = 6; // [0:1:20]

// mm, used if > 0
fixedShelfDepth = 60; // [0:1:200]

// mm
topShelfHeight = 56; // [0:1:200]

// mm
backThickness = 6; // [1:1:20]

// mm
shelfThickness = 6; // [1:1:20]

// Is top shelf included?
topShelf = 1; // [0:no, 1:yes]

// Is bottom shelf included?
bottomShelf = 1; // [0:no, 1:yes]

// Are holes included in bottom shelf?
bottomHole = 2; // [0:no, 1:yes, 2:half]

// mm
holeDepthAxis = 48; // [1:1:100]

// mm
holeWidthAxis = 28; // [1:1:100]

// deg
holeAngle = 45; // [-45:1:45]

numCols = 3; // [1:10]

numRows = 1; // [1:10]

// mm, used if > 0
fixedHoleWidthSpacing = 0; // [0:100]

// mm, used if > 0
fixedHoleDepthSpacing = 0; // [0:100]

// mm
labelTextSize = 7; // [0:1:50]

// Centered at the top
centerLabelText = "CA";

// Centered over each column
colLabelText = ["Thin", "Med", "Thick"];

/////////////////////////////////////////////////////////////////////////////
// Calculated values
/////////////////////////////////////////////////////////////////////////////

makeToolHolder(cleatHeight, cleatDepth, cleatThickness, fixedShelfDepth,
    topShelfHeight, backThickness, shelfThickness, topShelf, bottomShelf,
    bottomHole, holeDepthAxis, holeWidthAxis, holeAngle, numCols,
    numRows, fixedHoleWidthSpacing, fixedHoleDepthSpacing, labelTextSize,
    centerLabelText, colLabelText);

module makeToolHolder(cleatHeight, cleatDepth, cleatThickness, fixedShelfDepth,
    topShelfHeight, backThickness, shelfThickness, topShelf, bottomShelf,
    bottomHole, holeDepthAxis, holeWidthAxis, holeAngle, numCols,
    numRows, fixedHoleWidthSpacing, fixedHoleDepthSpacing, labelTextSize,
    centerLabelText, colLabelText) {

    // height

    maxHeight = cleatHeight + topShelf*topShelfHeight;

    // thickness and roundovers

    maxThickness = max(shelfThickness, backThickness);
    filletRadius = min(maxThickness, 5);

    shelfRoundOverRadius = shelfThickness/4;
    backRoundOverRadius = backThickness/4;
    cleatRoundOverRadius = cleatThickness/8;

    // hole dimensions

    holeWidth = sqrt(pow(holeWidthAxis,2) * pow(cos(holeAngle),2) + pow(holeDepthAxis,2) * pow(sin(holeAngle),2));
    holeDepth = sqrt(pow(holeWidthAxis,2) * pow(sin(holeAngle),2) + pow(holeDepthAxis,2) * pow(cos(holeAngle),2));

    holeNarrowWidth = holeDepthAxis * holeWidthAxis / holeDepth;
    holeNarrowDepth = holeDepthAxis * holeWidthAxis / holeWidth;

    // width spacing

    holeSpacing = (fixedHoleWidthSpacing > 0) ? fixedHoleWidthSpacing : shelfThickness/2/cos(holeAngle);

    width = holeSpacing + holeWidth + (numCols-1)*(holeNarrowWidth + holeSpacing);

    // depth spacing

    // if fixed depth is specified, use that
    // if fixed spacing is specified, use that

    if (fixedShelfDepth > 0) {

        shelfDepth = fixedShelfDepth;

        depthSpace = (fixedHoleDepthSpacing > 0) ? fixedHoleDepthSpacing : (shelfDepth - holeDepth - holeNarrowDepth*(numRows-1))/(numRows+1);

        makeSolid(shelfDepth, depthSpace);

    } else {

        depthSpace = (fixedHoleDepthSpacing > 0) ? fixedHoleDepthSpacing : (shelfDepth - holeDepth - holeNarrowDepth*(numRows-1))/(numRows+1);

        shelfDepth = holeDepth + depthSpace + (holeNarrowDepth + depthSpace)*(numRows -1);

        makeSolid(shelfDepth, depthSpace);

    }

    module makeSolid(shelfDepth, depthSpace) {

        maxDepth = shelfDepth + backThickness;

        rotate(a=180, v=[0,0,1]) {
            translate([-maxDepth/2, -maxHeight/2, 0]) {
                difference() {

                    linear_extrude(width) {
                        makeProfile(shelfDepth);
                    }

                    for (k = [0:numCols-1]) {

                        zcenter = holeWidth/2 + holeSpacing/2 + k*(holeSpacing + holeNarrowWidth);

                        for (j = [0:numRows-1]) {

                            // tool hole

                            xcenter = maxDepth - holeDepth/2 - depthSpace/2 - (depthSpace + holeNarrowDepth)*j;

                            if (topShelf) {
                                translate([xcenter, topShelfHeight-1.5*shelfThickness, zcenter]) {
                                    rotate(a=-90, v=[1,0,0]) {
                                        linear_extrude(2*shelfThickness) {
                                            ellipse(holeDepthAxis, holeWidthAxis, -holeAngle);
                                        }
                                    }
                                }
                            }

                            if (bottomShelf) {
                                if (bottomHole==1) {
                                    translate([xcenter, -0.5*shelfThickness, zcenter]) {
                                        rotate(a=-90, v=[1,0,0]) {
                                            linear_extrude(2*shelfThickness) {
                                                ellipse(holeDepthAxis, holeWidthAxis, -holeAngle);
                                            }
                                        }
                                    }
                                }

                                if (bottomHole==2) {
                                    translate([xcenter, shelfThickness/2, zcenter]) {
                                        rotate(a=-90, v=[1,0,0]) {
                                            linear_extrude(1*shelfThickness) {
                                                ellipse(holeDepthAxis, holeWidthAxis, -holeAngle);
                                            }
                                        }
                                    }
                                }
                            }

                        }

                        if (len(centerLabelText) > 0) {
                            if (len(colLabelText) > 0) {
                                addText(labelTextSize, colLabelText[numCols - 1 - k], maxHeight-backThickness - labelTextSize*2, zcenter);

                                translate([backThickness - 1, maxHeight-backThickness - labelTextSize*1.5, width*0.05]) {
                                    linear_extrude(width*0.9) {
                                        square([2, 1]);
                                    }
                                }

                            }

                        } else {
                            addText(labelTextSize, colLabelText[numCols - 1 - k], maxHeight-backThickness, zcenter);
                        }

                    }

                    addText(labelTextSize, centerLabelText, maxHeight-backThickness, width/2);

                }
            }
        }
    }

    module makeProfile(shelfDepth) {

        union() {

            // offsets for fillets
            offset(-filletRadius) {
                offset(filletRadius) {

                    union() {

                        // back profile
                        hull() {

                            translate([backRoundOverRadius, backRoundOverRadius, 0]) {
                                circle(r=backRoundOverRadius);
                            }
                            translate([backThickness - backRoundOverRadius, backRoundOverRadius, 0]) {
                                circle(r=backRoundOverRadius);
                            }
                            translate([backRoundOverRadius, maxHeight-backRoundOverRadius, 0]) {
                                circle(r=backRoundOverRadius);
                            }
                            translate([backThickness - backRoundOverRadius, maxHeight-backRoundOverRadius, 0]) {
                                circle(r=backRoundOverRadius);
                            }

                        }

                        // holder profile
                        if (topShelf) {
                            hull() {

                                translate([0, topShelfHeight - shelfThickness, 0]) {
                                    square([0.01*backThickness,shelfThickness]);
                                }
                                translate([shelfDepth + backThickness - shelfRoundOverRadius, topShelfHeight - shelfThickness + shelfRoundOverRadius, 0]) {
                                    circle(r=shelfRoundOverRadius);
                                }
                                translate([shelfDepth + backThickness - shelfRoundOverRadius, topShelfHeight - shelfRoundOverRadius, 0]) {
                                    circle(r=shelfRoundOverRadius);
                                }

                            }
                        }

                        // bottom shelf profile
                        if (bottomShelf) {
                            hull() {

                                translate([shelfRoundOverRadius, shelfRoundOverRadius, 0]) {
                                    circle(r=shelfRoundOverRadius);
                                }
                                translate([shelfRoundOverRadius, shelfThickness - shelfRoundOverRadius, 0]) {
                                    circle(r=shelfRoundOverRadius);
                                }
                                translate([shelfDepth + backThickness - shelfRoundOverRadius, shelfRoundOverRadius, 0]) {
                                    circle(r=shelfRoundOverRadius);
                                }
                                translate([shelfDepth + backThickness - shelfRoundOverRadius, shelfThickness - shelfRoundOverRadius, 0]) {
                                    circle(r=shelfRoundOverRadius);
                                }

                            }
                        }
                    }
                }
            }

            // cleat profile
            hull() {

                translate([0, maxHeight-backThickness-cleatThickness*sqrt(2), 0]) {
                    square([0.01*backThickness,cleatThickness*sqrt(2)]);
                }
                translate([-cleatDepth + cleatRoundOverRadius, maxHeight-backThickness-cleatDepth-cleatRoundOverRadius*tan(22.5), 0]) {
                    circle(r=cleatRoundOverRadius);
                }
                translate([-cleatDepth + cleatRoundOverRadius, maxHeight-backThickness-cleatDepth-cleatThickness*sqrt(2)+cleatRoundOverRadius/tan(22.5), 0]) {
                    circle(r=cleatRoundOverRadius);
                }
            }
        }
    }

    module ellipse(a, b, rotation) {
        rotate(a = rotation) {
            scale([a/2, b/2]) {
                circle(r=1);
            }
        }
    }

    module addText(textSize, textStr, x, z) {
        textDepth = min(0.25*backThickness, 2);

        translate ( [backThickness-textDepth, x, z] ) {
            rotate( a = 90, v=[0, 1, 0]) {
                linear_extrude(height = backThickness) {
                    text(text = textStr, size = textSize, halign="center", valign="top", $fn=20);
                }
            }
        }
    }
}
```


[User]
I'd like a parametric OpenSCAD design for a half-planter, something that can be mounted on a wall. I've got a few specific things in mind.

First, the basic shape is like a cylinder that transitions to a polygon as it goes up. The very bottom is a short cylinder, and then it smoothly expands to a polygon at a certain height and width. Then that polygon smoothly expands into another larger polygon at the full height of the planter. Essentially it's a cylinder at the bottom transitioning to a polygon at the top, but there's two stages to the polygon transition. The whole thing is then cut in half.

Here are the parameters I'd like to be able to control:

*   **planterWidth:** The overall width of the top of the planter (before it's cut in half).
*   **planterHeight:** The total height of the planter.
*   **wallThickness:** The thickness of the planter walls.
*   **numberOfSides:** The number of sides of the polygon at the top of the planter (before it's cut in half).
*   **cornerRadius:** The radius of the corners of the polygons.
*   **taperWidthPercent:** The width of the first polygon as a percentage of the planterWidth. This is the polygon it transitions to from the cylinder at the bottom.
*   **taperHeightPercent:** The height at which the shape transitions from the cylinder to the first polygon and then the first polygon to the final polygon, expressed as a percentage of the planterHeight.
*  **bottomDiameterPercent:**  The diameter of the cylindrical base as a percentage of planterHeight.
*   **drainHole:** A boolean (or string "yes"/"no") to indicate whether or not to include a drain hole in the bottom.
*   **holeDiameter:** The diameter of the drain hole.
*   **stringHole:** A boolean (or string "yes"/"no") to indicate whether or not to include a hole for hanging the planter with a string.
*   **stringDiameter:** The diameter of the string hole.

I'm not sure how to best calculate the center of mass so the string hole is well-positioned, but maybe you can approximate it.

I'd like the design to be fully parametric, meaning I can change any of these values in OpenSCAD and it should generate the correct shape, including those holes. Please make sure to create all of the necessary shapes and transformations; I'm not requesting a modification of any pre-existing libraries or code. It doesn't have to use any libraries.

[Assistant]
half-planter-2.scad:
```
/* [dimensions] */
// planter width in mm
planterWidth = 100;  //[50:10:300]
// planter height in mm
planterHeight = 80; //[50:10:300]
// wall thickness in mm
wall = 1.2; //[.9:.1:6]
/* [shape] */
// number of sides (before chopped in half)
numberOfSides = 16;   //[4:1:16]
// corner radius in mm
cornerRadius = 4; //[1:1:10]
// ratio of width of part between cylindrical bottom and polygonal top to planter width
taperWidthPercent = 80;   //[25:5:100]
// ratio of height of part between cylindrical bottom and polygonal height to planter height
taperHeightPercent = 50;  //[20:5:80]
// ratio of pottom diameter to planterHeight
bottomDiameterPercent = 60;   //[25:5:100]
/* [holes] */
// planter drain hole: yes or no
drainHole = "yes";   //[yes, no]
// planter drain hole diameter
holeDiameter = 6; //[4:1:15]
// hanging string hole: yes or no
stringHole = "yes";   //[yes, no]
// string hole diameter in mm
stringDiameter = 3;   //[2:1:8]

/* [hidden] */
$fn = 60;
x = 0; y = 1; z = 2;
allow = 4;
step = 360 / numberOfSides;
last = 360-step;
bottomHeight = max(wall, 1.8);
bottomRadius = (bottomHeight/2-.001);
bottomDiam = planterWidth*bottomDiameterPercent/100.;
taperWidth = planterWidth*taperWidthPercent/100.;
taperHeight = planterHeight*taperHeightPercent/100.;

module rshape(xx, yy, zz, rr) {
   hull() {
      for ( angle = [0:step:last] ) {
         rotate([0, 0, angle])
            translate([xx/2-rr, 0, 0])
               cylinder(h=zz, r=rr);
      }
   }
}
module fcylinder(z, x, rad) {
   translate([0, 0, rad])
      minkowski() {
         cylinder(h=z-2*rad, d=x-2*rad);
            sphere(rad, center=true);
      }
}
module planter() {
   difference() {
      solidPlanter();
      union() {
         // bottom and taper
         hull() {
            translate([0, 0, bottomHeight-bottomRadius])
               cylinder(h=bottomRadius, d=bottomDiam-2*wall);
            translate([0, 0, taperHeight - .001])
               rshape(taperWidth-2*wall, taperWidth-2*wall, .001, cornerRadius);
         }
         // bottom and taper
         hull() {
            translate([0, 0, taperHeight - .001])
               rshape(taperWidth-2*wall, taperWidth-2*wall, .001, cornerRadius);
            translate([0, 0, planterHeight - .001])
               rshape(planterWidth-2*wall, planterWidth-2*wall, .001, cornerRadius);
         }
         translate([-planterWidth/2, 0, 0])
            cube([planterWidth, 2*planterWidth, planterHeight]);
      }
   }
   back();
}
module solidPlanter() {
   fcylinder(bottomHeight, bottomDiam, bottomRadius);
      union() {
         // bottom and taper
         hull() {
            translate([0, 0, bottomHeight-bottomRadius])
               cylinder(h=bottomRadius, d=bottomDiam);
            translate([0, 0, taperHeight - .001])
               rshape(taperWidth, taperWidth, .001, cornerRadius);
         }
         // taper and top
         hull() {
            translate([0, 0, taperHeight - .001])
               rshape(taperWidth, taperWidth, .001, cornerRadius);
            translate([0, 0, planterHeight - .001])
               rshape(planterWidth, planterWidth, .001, cornerRadius);
         }
      }
}
module back() {
   intersection() {
      solidPlanter();
      translate([-planterWidth/2, -wall, 0])
         cube([planterWidth, wall, planterHeight]);
   }
}
// centroid = 4r/3pi
pi = 3.14159;
//centroid = (4*planterWidth/2) / (3*pi);
centroid1 = (4*((planterWidth+taperWidth)/2)/2) / (3*pi);
centroid2 = (4*((taperWidth+bottomDiam)/2)/2) / (3*pi);
centroid = ((taperHeightPercent/100*centroid2) + ((100-taperHeightPercent)/100*centroid1))/2;
echo("centroid", centroid);
difference() {
   planter();
   union() {
      if ( stringHole == "yes" ) {
         translate([-planterHeight, -centroid, planterHeight-stringDiameter])
            rotate([0, 90, 0])
               cylinder(h=2*planterHeight, d=stringDiameter);
      }
      if ( drainHole == "yes" ) {
         translate([0, -bottomDiam/4, -wall])
            cylinder(h=3*wall, d=holeDiameter);
      }
   }
}

```


[User]
I'd like to create a customizable handle design, something similar to the attached `CustomHandleR2.scad`. It should be parametric so I can easily adjust various aspects.

The core idea is a cylindrical handle with options for different types of holes through its center, as well as optional features at the end of the handle. The handle can have grooves around its circumference, and a collet or shield at one end.

Here's a more detailed breakdown of the parameters I need:

*   **Handle Dimensions:**
    *   `handle_dia`: Diameter of the main cylindrical handle body.
    *   `handle_len`: Length of the main handle body.
*   **Center Hole:**
    *   `hole_shape`: A selector with options for "round," "hexagon," or "square" hole.
    *   `hole_dia`: Diameter of the round hole.
    *   `hole_size`: Side-to-side dimension for the hexagon or square hole.
    *   `hole_dep`: Depth of the hole.
*   **Grooves:**
    *   `n_groove`: Number of grooves around the handle.
*   **Collet (Optional):**
    *   `collet`: Boolean switch to enable/disable the collet feature.
    *   `collet_dia`: Diameter of the collet.
    *   `collet_len`: Length of the collet.
*   **Shield (Optional):**
    *   `shield`: Boolean switch to enable/disable the shield feature.
    *  `shield_wid`: Width of the shield.
    *  `shield_thi`: Thickness of the shield.
*   **End Hole (Optional):**
    *   `end_hole`: Boolean switch to enable/disable a small hole at the end of the handle.
*   **General:**
    *   `smooth`:  An integer smoothness setting (e.g., 1 for high, 2 for medium, 3 for low)
    *   `tol`: Tolerance added to the hole diameter/size.
    *  `test_hole`: Boolean to enable generating a test part consisting of just the collet and hole.

I think it would also be helpful if the code outputted the total handle length, accounting for the shield or collet.

For the chamfering, the code used a chamfer module, maybe that could be included as well?

I'm hoping this will allow me to generate handles with various hole types, features, and dimensions for different purposes. I’m not using any specific library for this request.

[Assistant]
CustomHandleR2.scad:
```
//// File: CustomHandleR2.scad
//// Version: OpenSCAD 2015.03-2
//// Author: Kijja Chaovanakij
//// Date: 2018.07.11

// Revise-1: 2018.07.30
// - Change input size of square hole or hexagon hole from diagonal dimension to opposite side dimension.
// Revise-2: 2020.07.11
// - Rewrite for faster rendering
// - Remove some features
// Revise-3: 2020.07.13
// - bug fix about groove

//smoothness
smooth=3; //[1:high, 2:medium, 3:low]
//hole tolerance[0.66]
tol=0.66; //[0.5:0.02:0.8]
//test hole size (used together with collet)
test_hole=0; //[0:no, 1:yes]

/*[option]*/
//shape of the hole
hole_shape=1; //[0:round, 1:hexagon, 2:square]
//add the shield
shield=0; //[0:no, 1:yes]
//add the collet
collet=1; //[0:no, 1:yes]
//hole at the end of the handle
end_hole=0; //[0:no, 1:yes]

/*[hole]*/
//diameter of the round hole[8]
hole_dia=8; //[3:0.1:30]
//side to opposite side of the hexagon hole or the square hole[6.24]
hole_size=6.24; //[4:0.02:30]
//depth of the hole[80]
hole_dep=90; //[5:1:150]

/*[handle] */
//diameter of the handle[28] >= (hole diameter+7mm.)
handle_dia=28; //[10:1:80]
//length of the handle[100]
handle_len=100; //[10:1:150]
//number of the grooves
n_groove=5; //[0:1:8]

/*[collet] */
//diameter of the collet[15] >= (hole diameter+5mm.)
collet_dia=15; //[8:1:35]
//length of the collet[6]
collet_len=6; //[5:1:25]

/*[shield]*/
//width of the shield
shield_wid=12; //[10:1:30]
//thickness of the shield
shield_thi=3; //[2:0.1:5]

/*[Hidden]*/
$fa=3;
$fs=smooth/2;

//======== main ========//
if (shield==1)
  echo("total handle length=", handle_len+shield_thi);
else if (collet==1)
  echo("total handle length=", handle_len+collet_len);
else
  echo("total handle length=", handle_len);

if (test_hole==1)
  test_hole();
else
  rotate([90, 0, 0])
  translate([0, 0, -handle_len/2])
  handle();

module handle(){
  difference(){
    union(){
      color("Goldenrod")
      rotate_extrude()
      difference(){
        square([handle_dia/2, handle_len]);
        translate([handle_dia/2, 0])
        rotate([0, 0, 90])
          chamfer(size=handle_dia/5);
        if (shield==0)
          if (collet==0)
            translate([handle_dia/2, handle_len])
            rotate([0, 0, 180])
              chamfer(size=handle_dia/5);
          else if (collet==1)
            if (collet_dia <= handle_dia)
              translate([handle_dia/2, handle_len])
              rotate([0, 0, 180])
                chamfer(size=handle_dia/2-collet_dia/2);
      }//d
      if (shield==1)
        add_shield();
      else if (collet==1)
        add_collet();
    }//u
    groove();
    cut_center_hole();
    if (end_hole==1)
      cut_end_hole();
  }//d
}//m
//

module add_shield(){
  color("Gold")
  translate([0, 0, handle_len])
  rotate_extrude()
  union(){
    square([handle_dia/2+shield_wid-shield_thi/2, shield_thi]);
    translate([handle_dia/2+shield_wid-shield_thi/2, shield_thi/2])
      circle(d=shield_thi, $fn=32);
  }//u
}//m
//

module add_collet(){
  color("Gold")
  translate([0, 0, handle_len])
  rotate_extrude()
    difference(){
      square([collet_dia/2, collet_len]);
      translate([collet_dia/2, collet_len])
      rotate([0, 0, 180])
        chamfer(size=2, $fn=32);
    }//d
}//m
//

module groove(){
  $fn=48;
  for (i=[0:1:n_groove-1])
    rotate([0, 0, i*360/n_groove])
    translate([handle_dia/2*1.3, 0, 0])
      rotate_extrude()
      difference(){
        hull(){
          for (j=[handle_len*0.1, handle_len*0.9])
            translate([0, j, 0])
              circle(d=handle_dia*0.45);
        }//h
        translate([-handle_dia, -handle_dia/2, 0])
          square([handle_dia, handle_len+handle_dia]);
      }//d
}//m
//

module cut_center_hole(){
  ep=0.001;
  translate([0, 0, handle_len-hole_dep-ep])
  linear_extrude(hole_dep+collet_len+shield_thi)
  if (hole_shape==0)
    circle(d=hole_dia+tol);
  else if (hole_shape==1)
    circle(d=hole_size/cos(30)+tol, $fn=6);
  else if (hole_shape==2)
    circle(d=hole_size/cos(45)+tol, $fn=4);
}//m
//

module cut_end_hole(){
  translate([handle_dia/2*0.5, 0, 0])
  rotate([0, 40, 0])
    cylinder(h=handle_dia, d=2.4, center=true, $fn=32);
}//m
//

module chamfer(size=2){
  ep=0.001;
  translate([-ep, -ep])
  difference(){
    square([size, size]);
    translate([size, size])
      circle(r=size);
  }//d
}//m
//

module test_hole(){
  translate([0, 0, -handle_len])
  difference(){
    add_collet();
    cut_center_hole();
  }//d
}//m
//
```


[User]
I'd like to create a custom mount for an Echo Dot (2nd gen) that's similar to the "Echo Dude" design, but with a few specific changes and parametric options.

Here's what I have in mind:

The design should essentially be a cylindrical shell that holds the Echo Dot, but with a few key modifications.  First, it needs to be able to have either a full back or just a partial back, allowing the echo dot to stick out the back if desired. Second, the cable needs to exit on the lower left side, with a custom hole for the cable. The design will also need a small flat section for glue to secure to the body (this will be small and out of the way). I'm thinking that the main body of the model should be a cylindrical shell with a thickness, with the internal cutouts to fit the dot.

Here are the parameters I'd like to be able to control in the design:

*   **`has_back`**: A boolean (0 or 1) to determine if the back is solid or partial. If `has_back = 1`, the back is solid, if `has_back = 0` the back is partial.
*   **`dot_diameter`**: The diameter of the Echo Dot in mm.
*   **`dot_height`**: The height of the Echo Dot in mm.
*  **`dot_overhang`**: How much overhang will secure the dot, in mm.
*  **`dot_top_overhang`**: How much the top overhang will be in mm (if `has_back = 1`)
*   **`cable_from_back`**: The distance from the bottom of the dot to the center of the cable hole, in mm.
*   **`cable_height`**: The height of the cable hole, in mm.
*   **`cable_width`**: The width of the cable hole, in mm.
*   **`cable_rotate`**:  The rotation of the cable hole in degrees, from what would be considered vertical.
*  **`gluespot_depth`**: How deep the glue spot should be, in mm.
*  **`gluespot_height`**: The height of the glue spot, in mm.
*  **`gluespot_width`**: The width of the glue spot, in mm.
*  **`wall_width`**:  The thickness of the walls.

The cable hole should be a custom shape, not just a cylinder - it should have two cylinders that are the height of the cable, with a cube between them, all oriented to cut the cylinder. The glue spot should be a simple rectangular prism that is cut out of the main body, so it makes a flat space that is close to the edge of the main body.

I'd like to use standard OpenSCAD functions as much as possible and I don't need any special libraries or anything to make this work. Thanks!

[Assistant]
Echo_Dude_Upgrade.scad:
```
/**
 * Echo Dot (2nd generation) upgrade to Echo Dude.
 * Based on "Echo Dude" by redbobpants, https://www.thingiverse.com/thing:2894087
 * @author Robert Schrenk
 * @date 2018-07-10
**/

/* General Options */
// Print a solid back
has_back=1; // [0, 1]

/* Customize Dot Dimensions */
// Width of dot in mm
dot_diameter=85;
// Height of dot in mm
dot_height=33;
// Overhang to hold the dot in mm
dot_overhang=4; // [2,4,6,8]
// Overhang in the top middle to hold the spot in mm, only works when has_back is set to 1
dot_top_overhang=20;

/* Customize Connectors */
// distance from cable-hole from bottom of dot in mm
cable_from_back=9;
// height of cable-hole in mm
cable_height=10;
// width of cable-hole in mm
cable_width=26;
// rotation of cable hole in degree
cable_rotate=-45;

/* Customize Glue Spot */
// Glue spot
gluespot_depth = 1;
gluespot_height = 24;
gluespot_width = 11;

// Do not customize below this line
// width of walls
wall_width=3*1;

difference() {
    cylinder(d=dot_diameter+2*wall_width,h=dot_height+2*wall_width);
    // This is the dot itself
    translate([0,0,wall_width])
        cylinder(d=dot_diameter,h=dot_height);
    if(has_back==1) {
        translate([0,0,wall_width])
            cylinder(d=dot_diameter-dot_overhang,h=dot_height+3*wall_width);
    } else {
        translate([0,0,-2*wall_width+1])
            cylinder(d=dot_diameter-dot_overhang,h=dot_height+4*wall_width);
        // Also cut off the dot_top_overhang
        translate([0,-(dot_diameter+2*wall_width)/2,-wall_width])
        cube([(dot_diameter+2*wall_width),(dot_diameter+2*wall_width),dot_height+4*wall_width]);
    }
    // Cut off upper left area
    translate([0,-(dot_diameter+2*wall_width)/2-dot_top_overhang/2,-wall_width])
        cube([(dot_diameter+2*wall_width)/2,(dot_diameter+2*wall_width)/2,dot_height+4*wall_width]);
    // Cut off upper right area
    translate([0,dot_top_overhang/2,-wall_width])
        cube([(dot_diameter+2*wall_width)/2,(dot_diameter+2*wall_width)/2,dot_height+4*wall_width]);
    rotate([0,0,cable_rotate])
        connectors();
    gluespot();
}

module gluespot() {
    translate([-dot_diameter/2-wall_width,-gluespot_width/2,(dot_height+2*wall_width-gluespot_height)/2])
        cube([gluespot_depth,gluespot_width,gluespot_height]);
}

module connectors(){
    translate([-dot_diameter,0,cable_from_back+wall_width])
    rotate([0,90,0]) {
        translate([-cable_from_back/2,-cable_width/2,0])
            cylinder(d=cable_height,h=dot_diameter);
        translate([-cable_from_back/2,cable_width/2,0])
            cylinder(d=cable_height,h=dot_diameter);
        translate([-cable_from_back/2-cable_height/2,-cable_width/2,0])
            cube([cable_height,cable_width,dot_diameter]);
    }
}
```


[User]
I need an OpenSCAD design for a parametric screw endstop extender, similar to what I've seen on Thingiverse, but with a few specific needs in mind. I'd like it to be highly customizable, so I can adapt it to different screw sizes and desired extension lengths.

The basic shape should be a cylindrical base with a smaller diameter cylindrical extension on top. The screw will thread into the smaller diameter extension.  I'd like to define parameters for:

*   `baseDiameter`: The diameter of the bottom base cylinder.
*   `threadDiameter`:  The core diameter of the screw that will be used (important for a tight fit).
*   `footHeight`:  The height of the screw extension (the part that extends the screw length).
*   `threadHeight`: The depth of the screw hole within the extension.
*   `thickness`: The minimum thickness of the material, especially where the base meets the extension.
*   `resolution`:  Used for $fn value to control curvature of the cylinders (e.g. 50 or 100).

Also, it's critical for me to be able to add tick marks to the extension for easier calibration.  These ticks should be small raised features on the side of the cylindrical extension. They should be configurable by:

*   `ticks`: The total number of major ticks around the circumference.
*   `subTicks`: The number of sub-ticks between each major tick.
*   `tickHeight`:  The height of the major ticks.
*   `subTickHeight`: The height of the sub-ticks.

I envision the tick marks as small, triangular wedges projecting outwards from the main body. The ticks need to be attached to the base cylinder, and then the sub-ticks as well, but the whole thread cylinder should still be separate and cut out from the center, of course.

I need all code in a single .scad file, no separate files unless there's a really good reason, and no extra libraries outside of the built-in OpenSCAD standard library.

[Assistant]
EndstopExtender.scad:
```
/* [Base Parameters] */

// in mm
baseDiameter = 20; // [1:0.1:50]

// in mm (take care to use the core diameter - default is an M3 screw)
threadDiameter = 2.5; // [1:0.01:20]

// in mm (extension height)
footHeight = 5; // [1:0.01:50]

// in mm (distance that the screw enter the extension)
threadHeight = 5; // [1:0.1:50]

// in mm
thickness = 2; // [0.1:0.01:10]

// used as §fn value
resolution = 50;

/* [Tick Parameters] */
// number of ticks (take the thread pitch as a reference - M3 pitch: 0.5)
ticks = 5; // [0:1:36]

// number of sub ticks per tick
subTicks = 1; // [0:1:20]

// in mm (tick height)
tickHeight = 2.5; // [1:0.1:50]

// in mm (sub tick height)
subTickHeight = 1.5; // [1:0.1:50]

/* [Hidden] */

$fn = resolution;

difference() {
    union() {
        cylinder(h = thickness, r = baseDiameter / 2);
        cylinder(h = footHeight + threadHeight, r1 = baseDiameter / 2 - thickness, r2 = threadDiameter / 2 + thickness);
        tickWidth = max(thickness, threadDiameter);
        for(tickAngle = [0 : 360 / ticks : 360]) {
            rotate([0, 0, tickAngle]) {
                linear_extrude(height = tickHeight + thickness) {
                    polygon(points = [ [-tickWidth / 2, 0], [tickWidth / 2, 0], [0, baseDiameter / 2] ]);
                }
                for(subTickAngle = [(360 / ticks) / (subTicks + 1) : (360 / ticks) / (subTicks + 1) : 360 / ticks - 0.00001]) { // - 0.00001 to avoid the last subTick to be drawn - this is an ugly hack but shouldn't bring any problems
                    rotate([0, 0, subTickAngle]) {
                        linear_extrude(height = subTickHeight + thickness) {
                            polygon(points = [ [-tickWidth / 2, 0], [tickWidth / 2, 0], [0, baseDiameter / 2] ]);
                        }
                    }
                }
            }
        }
    }
    translate([0, 0, footHeight]) {
        cylinder(h = threadHeight + 1, r = threadDiameter / 2);
    }
}

```


[User]
Hi, I'm looking to create a customizable tablet/phone clip that can attach to a cylindrical post using a zip tie. I've seen some designs that do this, but I'd like one that's fully parametric so I can adjust it to different devices and post diameters.

Essentially, the design needs to have two main components: a band that wraps around the cylindrical post and a clip that holds the device. The band should have a gap in it that allows for easy mounting, and there should be a way to secure it using a zip tie. The clip part should have a groove to fit the edge of a phone or tablet, and I'd like to be able to adjust the groove size and height of the clip. The clip should attach to the band in a way that allows it to slide along the band to position the device.

Here are the parameters I'm envisioning:

**Band Parameters:**

*   `band_diameter`: Diameter of the cylindrical post.
*   `band_thickness`: Thickness of the band.
*   `band_width`: Width of the band.
*   `band_gap`: Angle of the gap in the band.

**Clip Parameters:**

*   `clip_width`: Width of the clip.
*   `clip_height`: Height of the clip.
*   `clip_groove_size`: Width of the groove that holds the device.
*   `clip_groove_bezel`: Amount of rounding on the groove edges.
*   `clip_wall`: Thickness of the clip walls.
*   `clip_bottom`: Thickness of the clip's base.
*   `clip_v_alignment`: Vertical alignment of the clip relative to the band (options for Center, Bottom, or Top, plus numerical offset)

**Zip Tie Parameters:**

*   `ziptie_size`: Size of the zip tie hole (Small or Large).

**Extra Parameters:**

*   `clip_extension`: How far the clip extends outwards.
*   `clip_shape`: Shape of the clip's body (None, Bevel, Rounded, or Bevel+Rounded).

**Printing Parameters**

* `print_count`: Number of copies to arrange on the print bed.
* `arrange_for_printing`: Boolean value (Yes or No) for arranging copies for printing.

I would like to be able to specify the `clip_v_alignment` as a string like "Center", "Bottom", "Top", in addition to numerical offsets.

The design should allow for multiple instances of the clip, arranged for printing. The design must use the `minkowski()` function to round the cube edges with a cylinder.

Could you please generate the OpenSCAD code for this? I would like it in a single file. I do not have any particular preference for libraries. Thanks!

[Assistant]
CylinderTabletMount.scad:
```
/**
 * Shelf Post Tablet Clip
 * for any 41mm Modular Shelf
 *
 * by Thinkyhead. CCA License.
 *
 * Clips onto a cylindrical shelf leg and secures with a zip tie.
 * The clip can slide, yet also keep the device in place.
 */

/* [Band] */

// (mm)
band_diameter = 41;       // [10:0.5:100]
// (mm)
band_thickness = 2;       // [2:0.125:4]
// (mm)
band_width = 5;           // [4:0.5:10]
// (degrees)
band_gap = 60;            // [40:90]

/* [Clip] */

// (mm)
clip_width = 50;          // [10:100]
// (mm)
clip_height = 5;          // [4:0.5:40]
// (mm)
clip_groove_size = 7;     // [1:0.5:20]
// (mm)
clip_groove_bezel = 3;    // [0:0.25:5]
// (mm)
clip_wall = 1.5;          // [1:0.25:4]
// (mm)
clip_bottom = 1.5;        // [1:0.25:4]

clip_v_alignment = 1;     // [0:Center, 1:Bottom, 2:Top]
                          // >3 offset down, <0 offset up

/* [Extras] */

ziptie_size = 0;          // [0:Small, 1:Large]

// (mm)
clip_extension = 0;       // [0:40]
clip_shape = 3;           // [0:None, 1:Bevel, 2:Rounded, 3:Bevel+Rounded]

/* [Plate] */
print_count = 1;          // [1:8]
arrange_for_printing = 0; // [0:No, 1:Yes]

/* [Hidden] */

zip_size_arr = [[1.6, 2.8], [2.5, 3.7]];
ziptie_hole = zip_size_arr[ziptie_size]; // Ziptie hole width, height

// Pre-calculated values
mount_r = band_diameter / 2;
mount_outer = mount_r+band_thickness;

clip_groove_cutout = clip_height-clip_bottom;
clip_outer = clip_groove_size + clip_extension + clip_wall * 2;

als = [0, (clip_height - band_width) / 2, -(clip_height - band_width) / 2];
sel_yoff = (clip_v_alignment >= 0 && clip_v_alignment <= 2) ? als[clip_v_alignment] : (als[1] - (clip_v_alignment - (clip_v_alignment >= 0 ? 2 : 0)));
max_y = als[1] + band_width / 2;
min_y = als[1] - clip_height + band_width / 2;

clip_y_offs = max(min(sel_yoff, max_y), min_y);

rotate([0,arrange_for_printing && clip_v_alignment == 2 ? 180 : 0,0]) many_mounts();

module many_mounts() {
  spx = max(band_diameter*1.75, clip_width + 1);
  spy = mount_outer * 2 + clip_outer * 2 + 10;
  xyr_a = [
    [0,0,0],[mount_r,10,180],[spx,0,0],[spx+mount_r,10,180],
    [0,spy,0],[mount_r,spy+10,180],[spx,spy,0],[spx+mount_r,spy+10,180]
  ];
  for (i=[0:print_count-1]) {
    xyr = xyr_a[i];
    translate([xyr[0],xyr[1]]) rotate([0,0,xyr[2]]) tablet_mount();
  }
}

//
// The whole assembled clip
//
module tablet_mount() {
  offs1 = [0, -mount_outer-clip_groove_size/2, clip_y_offs];
  offs2 = [0, -mount_outer-clip_outer/2+band_thickness, clip_y_offs];
  offs = offs1[1] < offs2[1] ? offs1 : offs2;
  translate(offs) difference() {
    union() {
      translate(-offs) mount_band();
      rotate([0,90]) {
        if (clip_shape >= 2) {
          intersection() {
            rounded_cube([clip_height,clip_outer,clip_width], r=2, $fn=72, center=true);
            rotate([0,90]) rounded_cube([clip_width,clip_outer,clip_height], r=clip_wall, $fn=144, center=true);
          }
        } else {
          rounded_cube([clip_height,clip_outer,clip_width], r=2, $fn=72, center=true);
        }
      }
    }
    clip_cut = clip_groove_cutout + 8;
    translate([0,-clip_extension/2,clip_cut/2-clip_height/2+clip_bottom]) rotate([0,90]) rounded_cube([clip_cut,clip_groove_size,clip_width+1], r=min(clip_groove_bezel,clip_groove_size/3), $fn=72, center=true);
    if (clip_extension >= 2.5) {
      slide_over = 1.5;
      cut_r = min(clip_extension/2,clip_height-clip_bottom) - slide_over / 2;
      translate([0,(clip_groove_size+clip_wall-slide_over)/2,clip_height/2]) rotate([0,90]) cylinder(r=cut_r, h=clip_width+1,center=true, $fn=max(10, cut_r*2));
    }
    if (clip_shape == 1 || clip_shape == 3) {
      for(x=[-1,1]) translate([x*(clip_width)/2,0,clip_height/2+clip_bottom]) rotate([0,x*-45]) cube([clip_height*1.414,clip_outer+1,clip_height*2],center=true);
    }
  }
}

//
// Mounting band part
//
module mount_band() {
  difference() {
    $fn=180;
    union() {
      cylinder(r=mount_outer, h=band_width, center=true);
      for (a=[-1,1]) rotate([0,0,a*(band_gap/2+5.5)]) translate([0,mount_outer-band_thickness/2])
        scale([1,2.2]) cylinder(r=band_thickness, h=band_width, center=true);
    }
    cylinder(r=mount_r, h=band_width+3, center=true);
    for (a=[-band_gap/2:band_gap/2]) rotate([0,0,a]) translate([0,mount_r+band_thickness/2])
      cube([1,band_thickness+10,band_width+2], center=true);
    for (a=[-1,1]) rotate([0,0,a*(band_gap/2+6)]) translate([0,mount_r+band_thickness/2+band_thickness])
      cube([5,ziptie_hole[0],ziptie_hole[1]], center=true);
  }
}

// Helpers
module rounded_cube(size=[1,1,1], r=0, center=false) {
  d = r * 2;
  w = d > size[0] ? 1 : size[0]-d;
  h = d > size[1] ? 1 : size[1]-d;
  // %cube(size, center=center);
  minkowski() {
    cube([w, h, size[2]], center=center);
    cylinder(r=r, h=0.01, center=true);
  }
}

```


[User]
I need an OpenSCAD design for making stencils of digits, 0 through 9. The idea is that some of the digits like 0, 4, 6, 8 and 9 have interior portions that would fall out if you just cut out the exterior shape, so I need "bridges" or "handles" that connect the inside parts to the main stencil.

Here are the key features I want:

*   **Digit Selection:** The design needs to be parametric so I can specify which digits I want to create a stencil for (e.g., "10", "245", "9038", etc.) as a string of characters.
*   **Size:** I need to be able to control the overall size of the digits. Let's call this variable `size`.
*   **Stencil Thickness:**  I need a variable to specify how thick the stencil will be, I'll call this `stencilThickness`.
*   **Handle Parameters:** I need to control the height of the handles (`handleHeight`) and their thickness (`handleThickness`). These are the little "bridges".
*   **Margins:**  I need variables for the horizontal and vertical margin from the edges of the bounding box surrounding all the stencils: `horizontalMargin` and `verticalMargin`.
*   **Spacing:**  I also want to control the spacing between the digits using a variable `spacing` (e.g., 0.1 means that there's a 10% gap between each character).
*   **Font:** Use Arial font, and specify the style as black.
*   **Handle Placement:**
    *   For the '0', the handle should go horizontally across the center.
    *   For the '4', the handle should connect the top right point to the middle of the vertical line, more or less.
    *   For the '6', the handle should connect the inner hole to the outer part, on the left.
    *   For the '8', two handles should connect the inner portion of the '8' to the outer portion, vertically (top and bottom, roughly).
    *   For the '9', a single handle should connect the inner hole at the top to the outer part, vertically.
*  **Library Requirements**: I don't want to use any custom libraries for this, I just want to stick with the default OpenSCAD libraries.

I expect that I should be able to specify these variables and get a printable stencil for any specified digits. I imagine the digits will be arranged horizontally on a base.

Could you generate an OpenSCAD file or files for this?

[Assistant]
stencil.scad:
```
digits = "10";
size = 94;
stencilThickness = 1;
handleHeight = 20;
handleThickness = 4;
verticalMargin = 13;
horizontalMargin = 0;

module handle(p1,p2,r=10,height=20,thickness=5,sides=8) {
    angle = atan2(p2[1]-p1[1],p2[0]-p1[0]) + 180/sides;
    module base() {
        translate(p1) rotate(angle) circle(r=r,$fn=sides);
        translate(p2) rotate(angle) circle(r=r,$fn=sides);
    }
    linear_extrude(height=height+thickness) base();
    translate([0,0,height])
    linear_extrude(height=thickness) hull() base();
}

module digit(d,size=100,thickness=1.5,handleHeight=20,handleThickness=4, hMargin=20,vMargin=20) {

        function s(x) = x/100*size;

    translate([hMargin,vMargin]) union() {
        linear_extrude(height=thickness)
        difference() {
            translate([-hMargin,-vMargin]) square([size*.9+2*hMargin,2*vMargin+size]);
            text(d,font="Arial:style=black",size=size);
        }

        if (d=="0") {
            handle([s(-2),s(50)],[s(40),s(50)],s(5),height=handleHeight,thickness=handleThickness);
        }
        else if (d=="4") {
            handle([s(20),s(75)],[s(42),s(48)],s(5),height=handleHeight,thickness=handleThickness);
        }
        else if (d=="6") {
            handle([s(48),s(23)],[s(48),s(-9)],s(5),height=handleHeight,thickness=handleThickness);
        }
        else if (d=="8") {
            handle([s(45),s(22)],[s(45),s(-10)],s(5),height=handleHeight,thickness=handleThickness);
            handle([s(45),s(77)],[s(45),s(108)],s(5),height=handleHeight,thickness=handleThickness);
        }
        else if (d=="9") {
            handle([s(45),s(77)],[s(45),s(108)],s(5),height=handleHeight,thickness=handleThickness);
        }
    }
}

module digits(s,size=100,thickness=1.5,handleHeight=20,handleThickness=4, hMargin=20,vMargin=20,spacing=0.1) {
    nudge = 0.001;
    w = len(s)*(0.9+spacing)*size+spacing*size;
    cube([hMargin+nudge,vMargin*2+size,thickness]);
    translate([hMargin+w-nudge,0,0]) cube([hMargin+nudge,2*vMargin+size,thickness]);
    translate([hMargin,0,0]) {
        for (i=[0:len(s)-1]) {
            translate([i*(spacing+0.9)*size,0,0])
                digit(s[i],size=size,thicknesss=thickness,hMargin=size*spacing,vMargin=vMargin,handleHeight=handleHeight,handleThickness=handleThickness);
        }
    }
}

render(convexity=9)
digits(digits,size=size,thickness=stencilThickness,handleHeight=handleHeight,handleThickness=handleThickness,vMargin=verticalMargin,hMargin=horizontalMargin);
```


[User]
I'd like to create a modular container system, and I'm looking for an OpenSCAD design that I can customize. The basic idea is that I'll have a main container body, and then I want to be able to easily attach other containers to each side using interlocking connectors. I'll need to be able to control the size of the base containers and whether or not the container has connectors on all sides.

Here are the specifics:

*   **Base Container:** I need to define the length, width, and height of the main container body. Let's start with these parameters being named `length`, `width`, and `height`. These values will determine the size of a single "unit" in the modular system.
*   **Connectors:** The connectors need to be designed so that one container's "connector" part fits snugly into another container's "insert" part. The connector/insert design should be repeated along each edge, and the number of connectors/inserts on each side should match the length/width of the container, effectively spacing them out in a grid, with a connector every 28 units in my case (see original file).
*   **Customization:**
    *   I want to be able to disable connectors on specific sides of the container. I need a `corner` boolean parameter that disables connector functionality for the left and right sides of the container, and a `wall` boolean parameter that only disables connector functionality for the left side of the container (it should not effect right side connectors).
    *   There should also be a `clearence` parameter to adjust the fit between the connector and insert, to account for printer tolerances; the original file uses 0.2.
*   **Printing:** The design should be suitable for printing in vase mode (spiralize outer contour in Cura).

I don't have any specific preferences about the look of the connector/insert shape, just that they should interlock well. I'd like it if you could generate the entire design in one or more .scad files, and I don't expect to need to link it to any existing libraries.

[Assistant]
modularContainer.scad:
```
/* [Settings] */

clearence = 0.2;

corner = false;
wall = false;

length = 1;
width = 1;
height = 20;

/* [Hidden] */

c = clearence;
size = [length, width, height]; //size

left_disabled = corner || wall;
right_disabled = corner;

module connector (h) {
    translate([2.5+c/2, 0, 0]) {
        cube([11-c, 2-c, h]);
        translate([2, 2-c, 0]) {
            cube([7-c, 2+c, h]);
        }
    }
}

module connectors (h, count) {
    for (i = [0:28:(count-1)*28]) {
        translate([i, -3.99999, 0]) {
            connector(h);
        }
    }
}

module insert (h) {
    translate([16.5-c/2, 0, 0]) {
        cube([7+c, 2-c, h]);
        translate([-2, 2-c, 0]) {
            cube([11+c, 2+c, h]);
        }
    }
}

module inserts (h, count) {
    for (i = [0:28:(count-1)*28]) {
        translate([i, -0.00001, 0]) {
            insert(h);
        }
    }
}
union () {
    difference () {
        cube([size[0]*28, size[1]*28, size[2]]);
        for (i = [0:3]) {
            if (i==0 && !left_disabled) {
                inserts(size[2], size[0]);
            } else if (i==1) {
                rotate([0, 0, 90]) {
                    translate([0, -size[0]*28, 0]) {
                        inserts(size[2], size[1]);
                    }
                }
            } else if (i==2) {
               rotate([0, 0, 180]) {
                   translate([-size[0]*28, -size[1]*28, 0]) {
                       inserts(size[2], size[0]);
                   }
               }
            } else if (i==3 && !right_disabled) {
                rotate([0, 0, 270]) {
                    translate([-size[1]*28, 0, 0]) {
                        inserts(size[2], size[1]);
                    }
                }
            }
        }
    }
    for (i = [0:3]) {
        if (i==0 && !left_disabled) {
            connectors(size[2], size[0]);
        } else if (i==1) {
            rotate([0, 0, 90]) {
                translate([0, -size[0]*28, 0]) {
                    connectors(size[2], size[1]);
                }
            }
        } else if (i==2) {
           rotate([0, 0, 180]) {
               translate([-size[0]*28, -size[1]*28, 0]) {
                   connectors(size[2], size[0]);
               }
           }
        } else if (i==3 && !right_disabled) {
            rotate([0, 0, 270]) {
                translate([-size[1]*28, 0, 0]) {
                    connectors(size[2], size[1]);
                }
            }
        }
    }
}
```


[User]
I'd like to design a bracelet with several different types of interconnected parts, and I'd like the design to be parametric so I can easily adjust the dimensions. The bracelet will consist of links, cube-shaped parts, puck-shaped parts, button-shaped parts and magnetic lock parts.

First, the links should be parametrically defined. They're essentially a 'figure 8' shape, where the ends of the "8" have a circular cutout. They need to have a width, an outer diameter, and an axle diameter. There should also be a clearance parameter so I can control how easily the links move.

Second, the cube parts should have a height and a width. I need three distinct cube parts: a bottom, a middle, and a top section. Each cube has a square profile with filleted edges at two opposite corners. The bottom and top cubes will have cutouts on the sides for connecting links. The middle cube part will also have these cutouts, but they will be mirrored on the z-axis. I need to be able to specify the clearance for these cutouts as well.

Third, the puck parts have an outer diameter, an inner diameter, and a height. They are basically cylinders with the option to have a inner hole and a cutout for links on the side of the cylinder. There's an inner and outer puck part. The inner part will have cutouts for links, and a central hole. The outer part will only have a central hole.

Fourth, the button part is a bit more complex. It should have a diameter and a height. It's basically a rounded dome shape with small pearl-like bumps on the outside, arranged in a grid pattern. It should also have cutouts for links. I need to be able to control the diameter of the pearls, the spacing, and an edge radius that controls the 'roundness' of the dome.

Finally, the magnetic lock consists of a cylinder or tube, a length and diameter as well as a diameter and length of a magnet (that resides inside the tube.) There should be a cutout for connecting the links and I should be able to specify a clearance.

I would like the code to use standard OpenSCAD functions and I do not need to use any external libraries.

Could you create the parametric OpenSCAD code for these parts?

[Assistant]
allsorts.scad:
```
// Allsorts Bracelet provided by Stellar Innovation
// http://www.thingiverse.com/stellarinnovation/about
// under Creative Commons License, Attribution (BY)

// Select part to print
partToPrint=1; // [1:link, 2:cube-bottom, 3:cube-middle, 4:cube-top, 5:whole-cube, 6:puck-outer, 7:puck-inner, 8:whole-puck, 9:button, 10:magnet-lock]

// Height of "cube" part
cubeHeight = 9.5;   // [7.5:0.5:12.5]

// Width of "cube" part
cubeWidth=19.0; // [15:0.5:25]

// Outer diameter of "puck" part
puckOuterDiameter=22.5; // [20:0.5:25]

// Inner diameter of "puck" part
puckInnerDiameter=9.5;  // [7.5:0.5:10]

// Height of "puck" part
puckHeight=11.5;    // [10:0.5:15]

// Diameter of "button" part
buttonDiameter=17; // [15:0.5:25]

// Outer diameter of magnet lock
tubeDiameter = 12.7;       // [10:0.1:15]

// Length of magnet lock
tubeLength = 22;        // [15:1:25]

// Diameter of magnet +tolerance (magnet-lock part only)
magnetDiameter = 10.5;           // [2:0.1:15]

// Length of magnet (magnet-lock part only)
magnetLength = 2;             // [2:0.1:10]

linkAxleDiameter = 1*3;
linkWall = 1*2;
linkOuterDiameter = 2*linkWall + linkAxleDiameter;
linkWidth = 1*4;

buttonHeight=1*6.4;
buttonPearlDiameter=1*1.6;
buttonPearlGrid=1*2.5;
buttonEdgeRadius=1*3;

tightFit=1*0.15;
clearance = 1*0.3;

if (partToPrint==1) {
  TypeBLink(linkWidth, linkOuterDiameter, linkAxleDiameter, 0, clearance);
}
else if (partToPrint==2 || partToPrint==4) {
  colors=["White", "Black", "Orange"];
  color(colors[partToPrint-2])
    CubePart(partToPrint-2);
}
else if (partToPrint==3) {
  color("Black")
    mirror([0, 0, 1])
      CubePart(layer=1);
}
else if (partToPrint==5) {
  for (layer=[0:2]) {
    colors=["White", "Black", "Orange"];
    color(colors[layer])
      translate([0,0,layer*cubeHeight/3])
        CubePart(layer);
  }
}
else if (partToPrint==6) {
  color("Yellow")
    mirror([0,0,1])
      OuterPuckPart();
}
else if (partToPrint==7 || partToPrint==8) {
    color("Black")
      InnerPuckPart();
    if (partToPrint==8)
      color("Yellow")
        OuterPuckPart();
}
else if (partToPrint==9) {
  color("Pink")
    ButtonPart();
}
else if (partToPrint==10) {
    color("Black")
      TubePart();
}

module CubePart(layer) {
  height = cubeHeight/3;

  difference() {
    translate([-0.5*cubeWidth, -0.5*cubeWidth])
      cube([cubeWidth, cubeWidth, height]);

    translate([0, 0, -height*layer]) {
      x1 = 0.5*(cubeWidth+clearance);
      for (x=[-x1, +x1])
        translate([x, -0.5*cubeWidth])
          Fillet(cubeWidth);

      if (layer!=2) {
        translate([x1, 0])
          LinkCutout();
        translate([-x1, 0])
          mirror([1, 0, 0])
            LinkCutout();
      }
    }
  }
}

module OuterPuckPart() {
  h = sqrt(0.75)*0.5*linkAxleDiameter + 0.5*linkOuterDiameter + clearance;
  w = linkWidth+clearance;
  difference() {
    cylinder(d=puckOuterDiameter, h=puckHeight, $fn=90);

    cylinder(d=puckOuterDiameter-2*linkWall, h=h, $fn=90);
    cylinder(d=puckInnerDiameter+tightFit, h=puckHeight, $fn=60);

    translate([-0.5*puckOuterDiameter, -0.5*w])
      cube([puckOuterDiameter, w, h]);
  }
}

module InnerPuckPart() {
  h = sqrt(0.75)*0.5*linkAxleDiameter + 0.5*linkOuterDiameter;
  difference() {
    union() {
      cylinder(d=puckOuterDiameter-2*(linkWall+tightFit), h=h, $fn=90);
      cylinder(d=puckInnerDiameter-tightFit, h=puckHeight, $fn=60);
    }
    x1 = 0.5*(puckOuterDiameter+clearance);
    translate([x1, 0])
      LinkCutout();
    translate([-x1, 0])
      mirror([1, 0, 0])
        LinkCutout();
  }
}

module ButtonPart() {
  x1=0.5*(buttonDiameter+clearance);
  gridX=buttonPearlGrid;
  offsetY=0.25*sqrt(3)*buttonPearlGrid;
  r = 0.5*buttonDiameter - buttonEdgeRadius;

  difference() {
    union() {
      BasicButton();

      maxGrid=r + buttonHeight + (0.5*PI-1)*buttonEdgeRadius;
      for (x=[0:gridX:2*maxGrid]) {
        Pearls(x, 0, maxGrid);
        Pearls(x+0.5*gridX, offsetY, maxGrid);
      }
    }

    translate([x1, 0])
      LinkCutout();
    translate([-x1, 0])
      mirror([1, 0, 0])
        LinkCutout();
  }
}

module BasicButton() {
  r=buttonEdgeRadius;
  x0=0.5*buttonDiameter-r;
  y0=buttonHeight-r;

  rotate_extrude() {
    square([x0, buttonHeight]);
    square([0.5*buttonDiameter, y0]);
    translate([x0,y0])
      circle(r=r, $fn=30);
  }
}

module Pearls(x, y0, maxGrid) {
  gridY=0.5*sqrt(3)*buttonPearlGrid;
  for (y=[y0:gridY:maxGrid]) {
    Pearl(x, y);
    if (x!=0) Pearl(-x, y);
    if (y!=0) Pearl(x, -y);
    if (x!=0 || y!=0) Pearl(-x, -y);
  }
}

module Pearl(x, y) {
  d = sqrt(x*x + y*y);
  r1 = 0.5*buttonDiameter;
  r0 = r1 - buttonEdgeRadius;

  if (d < r0)
    translate([x, y])
      cylinder(d=buttonPearlDiameter, h=buttonHeight+0.5*buttonPearlDiameter, $fn=12);
  else  {
    d0 = d - r0;
    arc = 0.5*buttonEdgeRadius*PI;
    arg = atan2(y, x);
    a = (d0<arc)? 90*d0/arc : 90;
    r2 = r0 + buttonEdgeRadius*sin(a);
    x2 = x*r2/d;
    y2 = y*r2/d;
    z2 = buttonHeight + buttonEdgeRadius*(cos(a)-1) - max(0, d0-arc);
    if (z2>0.5*buttonPearlDiameter && abs(y2) > 0.5*(linkWidth + buttonPearlDiameter))
    translate([x2, y2, z2])
      rotate([0, a, arg])
        cylinder(d=buttonPearlDiameter, h=buttonPearlDiameter, center=true, $fn=12);
//       if (d0 < arc) {
//      a = 90*d0/arc;
//      r2 = r0 + buttonEdgeRadius*sin(a);
//      x2 = x*r2/d;
//      y2 = y*r2/d;
//      z2 = buttonHeight + buttonEdgeRadius*(cos(a)-1);
//      if (abs(y2) > 0.5*(linkWidth + buttonPearlDiameter))
//      translate([x2, y2, z2])
//        rotate([0, a, arg])
//          cylinder(d=buttonPearlDiameter, h=buttonPearlDiameter, center=true, $fn=12);
//    }
//    else {
//      z = buttonHeight-buttonEdgeRadius-(d0-arc);
//      if (z > 0.5*buttonPearlDiameter)
//        translate([0, 0, z])
//          rotate([0, 90, arg])
//            cylinder(d=buttonPearlDiameter, h=r1+0.5*buttonPearlDiameter, $fn=12);
//    }
  }
}

module TubePart() {
  x1=0.5*(tubeDiameter+clearance);

  difference() {
    BasicTube();

    translate([x1, -0.5*tubeLength])
      LinkCutout();
  }
}

module BasicTube() {
  r=0.5*tubeDiameter;

  translate([0,0,r])
    rotate([90,0])
      difference() {
        union() {
          cylinder(d=tubeDiameter, h=tubeLength, $fn=60);
          rotate(-30)
            translate([0,-r])
              cube([r, r, tubeLength]);
          rotate(30)
            translate([-r,-r])
              cube([r, r, tubeLength]);
        }
        translate([-r, -2*r])
          cube([2*r, r, tubeLength]);
        cylinder(d=magnetDiameter, h=magnetLength, $fn=30);
        translate([0,0,tubeLength-magnetLength])
          cylinder(d=magnetDiameter, h=magnetLength, $fn=30);
      }
}

module Fillet(length) {
  r=0.5*(linkOuterDiameter - clearance);
  x1=0.5*linkOuterDiameter;
  z1=sqrt(0.75)*0.5*(linkAxleDiameter-clearance);

  difference() {
    translate([-x1, 0])
      cube([linkOuterDiameter, length, z1]);

    rotate([-90, 0]) {
      translate([-x1, -z1])
        cylinder(r=r, h=length, $fn=48);
      translate([x1, -z1])
        cylinder(r=r, h=length, $fn=48);
    }
  }
}

module LinkCutout() {
  w=linkWidth+2*clearance;
  d=linkOuterDiameter+clearance;
  r=0.5*d;
  s=sqrt(0.5)*r;
  z1=sqrt(0.75)*0.5*(linkAxleDiameter-clearance);

  translate([-r, 0])
    difference() {
      translate([0, 0, z1])
        rotate([-90, 0]) {
          cylinder(d=d, h=w, center=true, $fn=24);
          linear_extrude(height=w, center=true)
            polygon([[-s,-s], [0,r], [r,r], [r,-2*s-r]]);
        }

      width=0.5*(linkAxleDiameter-clearance);
      w2=0.8;
      eps=0.01;
      rotate([90, 0]) {
        linear_extrude(height=w+eps, center=true)
          AxleCrossView(linkAxleDiameter, width, clearance);
        linear_extrude(height=w2, center=true)
          AxleCrossView(linkAxleDiameter, width+2*w2, clearance);
      }
    }
}

// The axle is extruded from the Axle cross-view
//
// diameter    axle diameter (plus clearance)
// width       width of axle at bottom (<diameter)
// length      length of extruded axle
// clerance    distance between moving parts

module Axle(diameter, width, length, clearance=0) {
  rotate([90, 0])
   linear_extrude(height=length, center=true)
     AxleCrossView(diameter, width, clearance);
}

// The axle lies flat when printed, but it is rounded at the top
//
// diameter    axle diameter (plus clearance)
// width       width of axle at bottom (<diameter)
// clerance    distance between moving parts

module AxleCrossView(diameter, width, clearance=0) {
  r = 0.5*(diameter - clearance);
  x1 = 0.5*width;
  y1 = sqrt(0.75)*r;

  intersection() {
    translate([0, y1])
      circle(r=r, $fn=36);
    translate([-x1, 0])
      square([width, y1+r]);
  }
}

// Link with bushing (type-B)

module TypeBLink(linkWidth,
                 outerDiameter,
                 axleDiameter,
                 extraLength = 0,
                 clearance = 0,
                 topStopAngle = 90,
                 bottomStopAngle = 90) {
  linear_extrude(height=linkWidth-clearance) {
    HalfALink(outerDiameter = outerDiameter,
               axleDiameter = axleDiameter,
               openingGap = 0.5*axleDiameter,
               extraLength = 0.5*extraLength,
               clearance = clearance,
               topStopAngle = topStopAngle,
               bottomStopAngle = bottomStopAngle);
    mirror([1, 0, 0])
      HalfALink(outerDiameter = outerDiameter,
                 axleDiameter = axleDiameter,
                 openingGap = 0.5*axleDiameter,
                 extraLength = 0.5*extraLength,
                 clearance = clearance,
                 topStopAngle = topStopAngle,
                 bottomStopAngle = bottomStopAngle);
  }
}
// Half a Link is the right half of a (Type-A or B) link. It can also be combined with other parts.
//
// outerDiameter       Diameter of the link (plus clearance)
// axleDiameter        A positive value for a bushing with a hole for the axle (i.e type-B link)
// openingGap          Specifies the width of a possible opening gap (less clearance)
// extraLength         Makes the links longer
// clearance           Distance between moving parts
// flatBottom
// topStopAngle        Angle of top stop block
// bottomStopAngle     Angle of bottom stop block

module HalfALink(outerDiameter,
                 axleDiameter=0,
                 openingGap=0,
                 extraLength = 0,
                 clearance = 0,
                 flatBottom = false,
                 topStopAngle = 90,
                 bottomStopAngle = 90) {
  x0 = 0.5*outerDiameter + extraLength;
  D1 = outerDiameter - clearance;

  difference() {
    union() {
      translate([x0, 0]) {
        circle(d=D1, $fn=48);
        // stop angles (90 degrees=no stop)
        StopBlock(D1, topStopAngle);
        mirror([0,1])
          StopBlock(D1, bottomStopAngle);
      }

      // connection between link halves
      y_t = 0.25*sqrt(3)*D1;
      y0 = flatBottom? -0.5*D1 : -y_t;
      translate([0, y0])
        square([x0, y_t-y0]);
    }

    // axle and opening
    translate([x0, 0]) {
      if (axleDiameter > 0)
        circle(d=axleDiameter+clearance, $fn=36);
      if (openingGap > 0) {
        HalfAnOpening(openingGap, outerDiameter, axleDiameter, topStopAngle, clearance);
        mirror([0, 1])
          HalfAnOpening(openingGap, outerDiameter, axleDiameter, bottomStopAngle, clearance);
      }
    }

    // Narrow mid part
    D2 = outerDiameter + clearance;
    y2 = 0.5*sqrt(3)*outerDiameter;
    translate([extraLength, y2])
      circle(d=D2, $fn=48);
    translate([0, y2-0.5*D2])
      square([extraLength, D2]);

    if (!flatBottom) {
      translate([extraLength, -y2])
        circle(d=D2, $fn=48);
      translate([0, -y2])
      square([extraLength, 0.5*D2]);
    }
  }
}

// The stop block limits the rotation of the links
//
// diameter        diameter of link
// stopAngle       angle (CCW rotation) of stop block

module StopBlock(diameter, stopAngle) {
  r = 0.5*diameter;

  intersection() {
    square([r, r]);
    rotate(stopAngle)
      square([r,r]);
  }
}

// Half an opening is the upper half of the opening of a type-B (bushing) link
//
// opening gap     width of opening (less clearance), half of which is in the upper half (this part)
// axleDiameter    (less clearance)
// stopAngle       angle of stop block (90 degrees=no stop block)
// clearance       distance between moving parts (e.g. axle and bushing)

module HalfAnOpening(openingGap,
                        outerDiameter,
                        axleDiameter,
                        stopAngle = 90,
                        clearance = 0) {
    // bushing for axle
  R = 0.5*(outerDiameter - clearance);
  w = 0.5*(outerDiameter - axleDiameter) - clearance;

  // opening
  y0 = 0.5*openingGap + 0.5*clearance;
  // fancy fillet/radius
  r = 0.5*w;
  Rmid = R - r;
  y1 = y0+r;
  y_t = R*sin(stopAngle);
  // touches outer perimeter or stop block?
  x1 = (y_t < y1)? (Rmid-y1*sin(stopAngle))/cos(stopAngle) : sqrt(Rmid*Rmid-y1*y1);
  x2 = 1.5*R;
  y2 = (y_t < y1)? y1 + (x2-x1)*tan(stopAngle) : y1*x2/x1;
  difference() {
    polygon([[0, 0], [0, y0], [x1, y0], [x1,y1], [x2,y2], [x2, 0]]);
    translate([x1, y1])
      circle(r=r, $fn=24);
  }
}

```


[User]
Hi! I'm looking for some help designing a 3D-printable bearing puller. I need a parametric design that I can modify in OpenSCAD to fit different sized bearings. I've seen a few examples online, and I've got a basic idea of what I need.

Essentially, I need a cylindrical tool with a recess to accommodate the outer race of the bearing and a hole through the center for a bolt. The bolt will be used to push the bearing out from the opposite side. The key thing is to make the tool parametric, so I can easily adjust the diameters and heights based on the bearing I'm working with.

Specifically, here are the parameters I need to be able to adjust:

*   `bearing_outer_diameter`: The outer diameter of the bearing.
*   `bearing_inner_diameter`: The inner diameter of the bearing.
*   `bearing_height`: The height of the bearing.

I'll also need some derived parameters that are calculated from those, like:

*   `space_for_bearing_height`:  A bit more than the bearing height. Let's say 1.25 times the `bearing_height`.
*   `space_for_bearing_diameter`: A little larger than the `bearing_outer_diameter`.  Maybe 1.0385 times the `bearing_outer_diameter`.
*   `wall_thickness`: The thickness of the tool's wall.  I think 3mm should be good as a starting point.
*   `outer_diameter`: The outer diameter of the tool, should be derived from space_for_bearing_diameter + (2*wall_thickness).
*   `outer_cylinder_height`: The height of the tool's main body, derived from `space_for_bearing_height` + `wall_thickness`.

The tool should consist of an outer cylinder, a cylindrical recess that matches the bearing's outer diameter and height, and a through hole that matches the bearing's inner diameter.

Finally, I'd like an option that allows me to cut away part of the tool to fit in tighter spots on a bike frame - the reference design has this as an option to remove a section of the cylinder where it interfaces with the frame, and I think I'll need this also. I think that the parameters of the cutout need to be as follows:

*   `enable_cube_stereo_120_workaround`:  A boolean that turns the cutout on or off.
*    `cube_stereo_120_workaround_height`: The height of the cutout.

I'd like to see if you could generate the OpenSCAD code for this. I don't think I'll need any fancy libraries for this one. I'm anticipating that the file name should be `bearing-puller.scad`.

[Assistant]
bearing-puller.scad:
```
/*
Copyright © 2018 Bernd Zeimetz <bernd@bzed.de>
License: Creative Commons Attribution-ShareAlike 4.0 International
*/

/*
bearing configuration. 26/10/8 is a standard 6000 bearing
*/
bearing_outer_diameter = 26;
bearing_inner_diameter = 10;
bearing_height = 8;

/*
If you own a bike like the Cube Stereo 120 HPA MY2015
where the frame design was obviously done by somebody
who will never ever remove the pivot bearings on their own,
you can enable this workaround to produce a bearing removal
tool which will fit on the frame.

Might also work for other frames/parts where there is not enough
space for the full circle of the tool to sit on the frame/part.
*/
enable_cube_stereo_120_workaround = false;
cube_stereo_120_workaround_height = 1.4;

/*
you should not have to change these options, but
feel free to do if necessary.
*/
$fn=360;
space_for_bearing_height = bearing_height * 1.25;
space_for_bearing_diameter = bearing_outer_diameter*1.0385;
wall_thickness = 3;
outer_diameter = space_for_bearing_diameter + (2*wall_thickness);
outer_cylinder_height = space_for_bearing_height + wall_thickness;

translate(v=[0,0,outer_cylinder_height]) {
    rotate(a=[180,0,0]) {
        difference() {

            cylinder(
                h=outer_cylinder_height,
                d=outer_diameter
            );
            union() {
                cylinder(
                    h=space_for_bearing_height,
                    d=space_for_bearing_diameter
                );
                cylinder(
                    h=outer_cylinder_height*1.5,
                    d=bearing_inner_diameter
                );
                if (enable_cube_stereo_120_workaround) {
                    cube(
                        [
                            outer_diameter,
                            outer_diameter,
                            cube_stereo_120_workaround_height
                        ],
                        false
                    );
                }
            }
        };
    };
};

```


[User]
Okay, so I have this idea for a thing to hold two of my existing spool holders, which are kind of like rollers for the spool. I've already made a simple design for it, and it mostly works, but I'm thinking it could be a lot better if I used a parametric approach and maybe included a few more useful features.

Here's the gist: I want a base with two raised rails. The rails should be parallel, and they should be able to hold a standard TUSH spool holder (which is basically a cylinder with a flat base). The distance between the rails and their dimensions needs to be adjustable, as well as the base size and other stuff. I've got some OpenSCAD code I've been messing around with as a start, but I'd like to see if you could make something much more flexible and reusable for me, rather than a bunch of hardcoded variables. I mean, the point is to be able to customize the thing after all. I think I would prefer an OpenSCAD file, or a collection of OpenSCAD files, that make it super easy to customize this for other uses.

Here are the key parameters I want to be able to control:

*   **Rail Width:** The width of each rail.
*   **Rail Height:** The height of the rail from the base.
*   **Rail Length:** The total length of a single rail.
*   **Rail Separation:** The center-to-center distance between the two rails.
*   **Closed Rails:** A boolean flag to determine if the rails have end walls (to keep things from sliding off), or if they are just open rails.
*   **Wall Thickness:** The thickness of the walls that make up the rails.
*   **Base Thickness:** The thickness of the base under the rails.
*   **Label Enable:** Boolean to enable or disable a label on the base.
*   **Label Text:** Text of the label. Allow for this to be a numeric value or a string.
*   **Label Thickness:** How far the label protrudes from the base, if label is enabled
*   **Label Size:** Size of the text. If not specified, this will be auto calculated based on available space.
*   **Label Margin:** Space between edge of the label and the rails if the text size isn't specified.

I'd also like the label to be automatically sized if I don't specify a label size. It should fit within the space between the rails, taking into account a reasonable margin.

I'm not looking for any specific look and feel, the primary goal is to be highly configurable and reusable. I'd also like to avoid relying on too many external libraries if that's possible. I'm mostly interested in vanilla OpenSCAD primitives for this one, if you can make it work.

Also, if you can arrange for any of the parameters to influence each other, or have a kind of "smart" behavior, that would be super helpful. Like the base size being influenced by the rail size for instance. Or not allowing the label to be larger than will fit between the rails. I'm not sure what else is possible but would love to be surprised!

[Assistant]
TUUSHH.scad:
```
// TUUSHH (The Ultimate Ultimate Spool Holder Holder)
//
// Uh... working title. I suppose that since a spool is a
// filament holder, I could call it the Ultimate Ultimate
// Filament Holder Holder Holder. but TUUFHHH just doesn't
// roll off the tongue like TUUSHH does.
//
// A model designed to hold two Ultimate Spool
// Holders a fixed distance apart, but flexible enough to
// generate any shape with a flat base and two rails,
//
// By the way, I can't see very well, and the only way I
// can read what I'm writing is to have the font size
// turned waaay up. So if all the commentsw look like they
// were written on a VIC-20, that's why.

/* [Rail]  */

// distance between walls of the rail
rail_width =  14.5;

// height of the rail from the base
rail_height =  10;

// length from tip-to-tail of a rail
rail_length = 130;

// center-to-center distance between rails
rail_separation = 80;

// if true, walls will be addded on either side of the rails
closed_rails = true;

/* [Walls] */
// thickness of the walls that make up the two rails
wall_thickness = 2;

// thickness of the base that sits under the rails
base_thickness = 2;

/* [Label] */
// emboss text on the base between the rails
label_enable = true;

// text to emboss or "rail_separation". I used this during developnent,
label_text = "TUUSHH";

// height of the enbossed label
label_thickness = 0.3;

// height of the label text, or calculated in 0
label_size = 10;

// amount of space on either side of the label, for calculated sizes
label_margin = 10;

// Draw a rail straddling the Y axis.
module rail() {
	// Internal module too trivial to merit a spot in
	// the global namespace. Draw a wall, using a "cube"
	// (ugh) translated so its center is on the X axis
	// and its left edge is at rail_separation/2. When
	// we mirror this we'll have a nice rail straddling the
	// Y axis. Oh, and its at the appropriate Z to sit
	// on the base.
	module wall() {
		translate([
			rail_width/2,
			-rail_length/2,
			base_thickness
		])
		cube([ /* not a cube */
			wall_thickness,
			rail_length,
			rail_height
		]);
	}

	// draws the wall to be placed at the end of the rails, if the rails are to be closed
	module retainer() {
		translate([
			-wall_thickness-rail_width/2,
			-wall_thickness-rail_length/2,
			base_thickness
		])
		cube([
			rail_width + 2*wall_thickness,
			wall_thickness,
			rail_height]
		);
	}

	// Create a rail by mirroring
	// two walls, and while we're at,
	// translate them to the appriate
	// X to be the right rail. We'll
	// be pulling the mirror trick again.
	translate([
		rail_separation/2,
		0,
		0
	])
	union() {
		mirror([1, 0, 0])
		wall();

		wall();

		// add the retainers if requested
		if (closed_rails) {
			retainer();

			mirror([0, 1, 0])
			retainer();
		}
	}

}

// The base everthing sits on. Just a big rectangle
// with the right thickness
module base() {
	base_width = rail_separation +
		2 * rail_width/2 +
		2 * wall_thickness;

	base_length = rail_length +
		(closed_rails ? 2 * wall_thickness : 0);

	// build the base in the center, then move it up
	// to sit on the X/Y plane
	translate([ 0, 0, base_thickness/2])
	cube([
		base_width,
		base_length,
		base_thickness],
		center=true);

}

module label() {
	label_size = label_size ?
		label_size :
		rail_separation - rail_width - 2 * wall_thickness - 2 * label_margin;
	// Note that the size of we give text() doesn't
	// really matter since we're going to resize() it
	// anyway

	function label_text() =
		label_text == "rail_separation" ?
		str(rail_separation) :
		label_text;

	rotate([0, 0, 90]) // make the text lie on the Y axis, not X
	translate([0, -label_size/2, base_thickness]) // center vertically and set on base
	linear_extrude(label_thickness)
	resize([0, label_size], auto=true)
	text(label_text(), size=100, halign="center");
}

// Two rails, one base, and a label make a TUUSHH
module TUUSHH() {
	mirror([1, 0, 0])
	rail();
	rail();

	base();

	if (label_enable)
		label();
}

TUUSHH();

```


[User]
Hey, I'm looking for help designing a 3D model for a cat-shaped planter or small vessel. I'd like it to be parametric so I can easily adjust its size and features.

Here’s what I have in mind:

*   **Overall Shape:** The main body should be a rounded, barrel-like shape, sort of like a squat cylinder, but with some curvature. Think of the body of a cartoon cat, but simplified.
*   **Parameters:** I need to be able to control the following aspects via variables:
    *   `catWidth`: The width of the main body in millimeters.
    *   `wall`: The wall thickness, also in millimeters.
    *   `drainHole`: A boolean option to include or exclude a drain hole. I'd like to set this to either "yes" or "no".
    *   `hole`:  The diameter of the drain hole in millimeters, if `drainHole` is "yes".
    *   `vesselOrSaucer`: A setting that lets me choose between generating a "vessel" (the cat-shaped pot), a "saucer" (a simple, rounded dish to go under the pot), or "both" (both the pot and saucer side by side).
    *   `renderMode`: A choice between "normal" and "lo-poly" which will let me choose between higher- or lower-resolution renderings of the model.
*   **Features:** The cat should have a few basic features:
    *   A small, somewhat pointed nose.
    *   Two eyes; simple circular indents would be fine.
    *   Some suggestion of whiskers, perhaps a few shallow engraved lines on each side of the nose, or just a simplified flat "whisker" shape.
   *    A small cut-out in the top of the vessel to approximate ears.
*   **Saucer Details:**  If I select "saucer" or "both", the saucer should be a simple, slightly dished shape and have a small ring on its underside. I should be able to control the height of the ring.

I imagine this would require at least one scad file, and it would be great if you could make it work with OpenSCAD. I do not need any external libraries, although if you think it will make it easier for you then I'm open to it.

[Assistant]
cat_vessel-2.scad:
```
// cat vessel
// 2018-07-19 Lucina
// preview[view:north, tilt:top]
/* [simple settings] */
// width of barrel in mm
catWidth = 100; //[30:5:300]
// wall thickness in mm
wall = 1.8; //[.6:.1:10]
// drain hole
drainHole = "yes";   //[yes, no]
// drain hole diameter in mm
hole = 10;  //[8:1:25]
// pot or saucer
vesselOrSaucer = "vessel"; //[vessel, saucer, both]
// render mode
renderMode = "normal";  //[normal, lo-poly]

/* [hidden] */
x = 0; y = 1; z = 2;
// vertical roundness
// height of barrel in mm
barrelHeight = .85*catWidth;   //[30:5:300]
pot =[catWidth, catWidth, barrelHeight];
roundness = 70;   //[20:80]
elongate = 1. - roundness/100.;
lores = 16;
hires = 80;
reso = ( renderMode == "normal" ) ? hires : lores;
$fn = reso;
eyeRes = ( renderMode == "lo-poly" ) ? reso/2 : reso;
allow = 4;
minSaucer = 12;
dish = [pot[x]+allow+2*wall, pot[x]+allow+2*wall, max(pot[z]/10, minSaucer)];
earHeight= .25*pot[z];
actualHole = min(.5*.7*pot[x], hole);
echo("actualHole", actualHole);

module barrel(xx, zz) {
   difference() {
      translate([0, 0, zz/2])
      scale([1, 1, (zz/xx)*(1+elongate)])
         sphere(d=xx, $fn=reso);
      union() {
         translate([-xx/2, -xx/2, -zz*elongate/2])
            cube([xx, xx, zz*elongate/2]);
         translate([-xx/2, -xx/2, zz])
            cube([xx, xx, zz*elongate/2]);
      }
   }
}
module vessel() {
   difference() {
      // main
      union() {
         scale([1, .7, 1])
            barrel(pot[x], pot[z]+wall);
         nose(pot[x]);
         eyes(pot[x]);
         whiskers(pot[x]);
      }
      // hollow and drain hole
      union() {
         translate([0, 0, wall])
      scale([1, .7, 1])
            barrel(pot[x]-2*wall, pot[z]-wall);
         translate([-pot[x]/2, -pot[x]/2, pot[z]-.0001])
            cube([pot[x], pot[x], 2*wall]);
         translate([0, 0, -1.5*wall])
            cylinder(h=3*wall, d=actualHole, $fn=hires);
         translate([0, 0, pot[z]-earHeight])
            earCutout(pot[x], pot[x], earHeight);
      }
   }
}
module earCutout(xx, yy, zz) {
   bottom = xx*.5;
   top = xx*.7;
   difference() {
      hull() {
         translate([-bottom/2, -yy/2, 0])
            cube([bottom, yy, .0001]);
         translate([-top/2, -yy/2, zz-.0001])
            cube([top, yy, .0001]);
      }
   translate([0, 0, -.5*zz])
      rotate([90, 0, 0])
      scale([1, .6, 1])
      cylinder(h=2*yy, d=top, center=true);
   }
}
module saucer() {
   difference() {
      // main
      scale([1, .7, 1])
         barrel(dish[x], pot[z]);
      // hollow
      union() {
         translate([0, 0, wall])
         scale([1, .7, 1])
            barrel(dish[x]-2*wall, pot[z]-wall, lores);
         translate([-dish[x]/2, -dish[x]/2, dish[z]])
            cube([dish[x], dish[x], pot[z]]);
      }
   }
   // ring
   translate([0, 0, wall])
      difference() {
         scale([1, .7, 1])
            cylinder(h=wall, d=.5*dish[x], $fn=hires);
         union() {
            scale([1, .7, 1])
               cylinder(h=2*wall, d=.5*dish[x]-2*wall, $fn=hires);
            for ( angle = [0:45:135] ) {
               rotate([0, 0, angle])
                  cube([wall, dish[x], 2*wall], center=true);
            }
         }
      }
}
module nose(xx) {
   if ( renderMode == "lo-poly" ) {
      intersection() {
         translate([0, 0, .25*xx])
            rotate([90, 90, 0])
               fcylinder(xx*.72, xx*.15, xx*.05);
         scale([1, .7, 1])
            barrel(pot[x]*1.05, pot[z]+wall);
      }
   }
   else {
      translate([0, 0, .25*xx])
         rotate([90, 90, 0])
            fcylinder(xx*.72, xx*.15, xx*.05);
   }
}
module eyes(xx) {
   intersection() {
      union() {
         translate([.2*xx, 0, .37*xx])
         union() {
            rotate([90, 0, 0])
               difference() {
                  cylinder(h=xx*.70, d=xx*.12, center=true, $fn=eyeRes);
                  translate([0, -.3*xx*.18, 0])
                     cylinder(h=xx*.70, d=xx*.12, center=true, $fn=eyeRes);
               }
         }
         translate([-.2*xx, 0, .37*xx])
            union() {
               rotate([90, 0, 0])
                  difference() {
                     cylinder(h=xx*.70, d=xx*.12, center=true, $fn=eyeRes);
                     translate([0, -.3*xx*.18, 0])
                        cylinder(h=xx*.70, d=xx*.12, center=true, $fn=eyeRes);
                  }
            }
      }
      scale([1, .7, 1])
      barrel(pot[x]+2*wall, pot[z]+wall);
   }
}
module whiskers(xx) {
   intersection() {
      difference() {
         translate([0, 0, .18*xx])
            union() {
               cube([xx*.7, xx*.68, xx*.02], center=true);
               rotate([0, 17, 0])
                  cube([xx*.7, xx*.68, xx*.02], center=true);
               rotate([0, -17, 0])
                  cube([xx*.7, xx*.68, xx*.02], center=true);
            }
            translate([0, 0, .18*xx])
               rotate([90, 90, 0])
                  cylinder(h=xx*.74, d=xx*.15, center=true);
      }

      scale([1, .7, 1])
      barrel(pot[x]+2*wall, pot[z]+wall);
   }
}
module fcylinder(zz, xx, rr) {
   translate([0, 0, rr-zz/2])
      minkowski() {
         cylinder(h=zz-2*rr, d=xx-2*rr, $fn=3);
         sphere(rr, $fn=eyeRes);
      }
}

if ( vesselOrSaucer == "vessel" ) {
   vessel();
}
else if ( vesselOrSaucer == "saucer" ){
   saucer();
}
else if ( vesselOrSaucer == "both" ){
   vessel();
   translate([(pot[x]+dish[x])/2+3, 0, 0])
      saucer();
}

```


[User]
I'm looking for an OpenSCAD design for a blower tip that can attach to a small DC brushless fan, specifically something like the Delta BFB1012H. I need it to be parametric so I can adjust it for different fans later.

Here's what I need:

*   **Base:** This part connects to the fan. It should have adjustable dimensions for its x and y size, as well as its z-height. It should have rounded corners with a configurable radius. There should also be a wall thickness parameter so I can adjust the strength of the base. It needs to be hollow, essentially a tube that fits over the fan's output.

*   **Chamber:** This is the transition part between the base and the tip. It should have a configurable length along the z-axis.

*   **Tip:** This is the end of the blower tip. It needs adjustable x, y, and z dimensions, as well as a corner radius and wall thickness. The tip should also be hollow and have a configurable shape: round, a rectangular slot, or a rectangle with rounded corners. The tip's orientation (vertical or horizontal relative to the fan's output direction) should also be adjustable, and its position (y-offset from the center of the fan output) should also be a parameter.

The design should be done in such a way that previewing is relatively fast. The design also needs to use `linear_extrude()`, `difference()`, `offset()`, `hull()`, `minkowski()`, `translate()`, `rotate()`, and `circle()` primitives, as well as a custom `round_square()` module. I'd like `slot()` to be implemented as well, based on circles that are translated and then hulled. The design doesn't need to use any special libraries; it should be a single `.scad` file.

Thanks!

[Assistant]
BlowerTip.scad:
```
//// File: BlowerTip.scad
//// Version: OpenSCAD 2015.03-2
//// Author: By Kijja Chaovanakij
//// Date: 2018.07.12

// Base's parameters refer to Delta dc brushless fan model BFB1012H

// Revise-1: Date: 2020.07.16
// Rewrite for fast preview

//smoothness
$fn=36; //[36:low, 48:medium, 60:high]
//fit tolerance between base and blower fan[0.3]
fit_tol=0.3; //[0:0.1:1]

/*[option]*/
//tip shape
tip_shape=2; //[1:round, 2:slot, 3:rectangular]
//tip rotation
tip_rotate=2; //[1:verical, 2:horizontal]
//tip y offset from center of the fan's discharge port
tip_yoffset=15; //[0:1:100]

/*[base]*/
//inner base or outer object x size[32.9]
base_xsize=32.9;
//inner base or outer object y size[57.8]
base_ysize=57.8;
//inner base or outer object z overlap[11]
base_zsize=11;
//inner base or outer object corner radius[2.5]
base_rad=2.5;
//base wall thickness[1.6]
base_wall=1.6;

/*[chamber]*/
//chamber length between base and tip. It should be almost twice of the fan's bigger base size.[115.6]
cham_zsize=90;

/*[tip]*/
//inner tip x size[32]
tip_xsize=24;
//inner tip y size[12]
tip_ysize=12;
//tip z size[14]
tip_zsize=14;
//inner tip radius[7]
tip_rad=7;
//tip wall thickness[1.6]
tip_wall=1.6;

//======== main ========//
color("Gold")
hollow_base();
color("Tan")
hollow_chamber();
color("Gold")
translate([0, tip_yoffset, base_zsize+cham_zsize])
  hollow_tip(tip_zsize);

//hollow_base();
module hollow_base(){
  linear_extrude(base_zsize)
  difference(){
    offset(base_wall)
      round_square(xwid=base_xsize+fit_tol, ywid=base_ysize+fit_tol, rad=base_rad);
    round_square(xwid=base_xsize+fit_tol, ywid=base_ysize+fit_tol, rad=base_rad);
  }//d
}//m
//

//hollow_tip();
module hollow_tip(){
  linear_extrude(tip_zsize)
  difference(){
    offset(base_wall)
      tip_shape();
    tip_shape();
  }//d
}//m
//

//hollow_chamber();
module hollow_chamber(){
  ep=0.001;
  difference(){
    hull(){
      translate([0, 0, base_zsize])
      linear_extrude(ep)
      offset(base_wall)
        round_square(xwid=base_xsize+fit_tol, ywid=base_ysize+fit_tol, rad=base_rad);
      translate([0, tip_yoffset, base_zsize+cham_zsize-ep])
      linear_extrude(ep)
      offset(base_wall)
        tip_shape();
    }//h
    hull(){
      translate([0, 0, base_zsize-ep])
      linear_extrude(ep)
        round_square(xwid=base_xsize+fit_tol, ywid=base_ysize+fit_tol, rad=base_rad);
      translate([0, tip_yoffset, base_zsize+cham_zsize])
      linear_extrude(ep)
        tip_shape();
    }//h
  }//d
}//m
//

//tip_shape();
module tip_shape(){
  if (tip_rotate==1)
    rotate([0, 0, 90]){
      if (tip_shape==1)
        circle(r=tip_rad);
      if (tip_shape==2)
        slot(xwid=tip_xsize, rad=tip_rad);
      if (tip_shape==3)
        round_square(xwid=tip_xsize, ywid=tip_ysize, rad=base_rad);
    }//r
  if (tip_rotate==2){
    if (tip_shape==1)
        circle(r=tip_rad);
    if (tip_shape==2)
        slot(xwid=tip_xsize, rad=tip_rad);
    if (tip_shape==3)
      round_square(xwid=tip_xsize, ywid=tip_ysize, rad=base_rad);
  }
}//m
//

//round_square();
module round_square(xwid=10, ywid=20, rad=1){
  minkowski(){
    circle(r=rad);
    square([xwid-rad*2, ywid-rad*2], true);
  }//m
}//m
//

//slot();
module slot(xwid=10, rad=1){
  hull(){
    for(i=[xwid/2-rad, -xwid/2+rad])
      translate([i, 0, 0])
        circle(r=rad);
  }//h
}//m
//

```


[User]
I need a parametric design for a filament sample spool holder. It's based on the "Parametric Loose Filament Spool Holder" by anotherhowie, but I need some specific modifications.

Here are the key parameters I want to control:

*   **`spool_holder_diameter`**: This is the diameter of the hole in the center of the spool holder. It should be a parameter, not the spindle diameter. The example I have uses 51 mm.
*   **`hook_diameter`**: This is the diameter that the filament hooks will extend to. The example I have is 125 mm.
*   **`outside_diameter`**: This is the overall diameter of the holder, 150 mm in the example.
*   **`spindle_depth`**: The depth of the central spindle part of the holder, 27.5 mm in the example.
*   **`num_arms`**:  The number of arms that extend from the center, which should be 3 or more.
*   **`arm_width`**:  The width of each arm, which is 20 mm in my example.
*   **`wall_thickness`**: This is the thickness of all the flat parts, like the arms and the hub, set to 3 mm in the example.
*    **`hex_diameter`**: The diameter of the hexagonal connector, set to 6 mm in the example.

Here are the design requirements:

*   **Filament Clips**: The hooks need to have integrated filament clips. The example uses 3.5 mm holes for the clips.
*   **Recessed Hooks**: The hooks should not extend past the `spindle_depth`. There should be a small gap to allow for mounting multiple holders side-by-side.
*   **Hex Connectors**: The hooks should use a hexagonal connector to ensure proper orientation on the arms.
*   **Spindle Holes**:  There should be holes through the spindle that match the number of arms (times two), just for aesthetics.
*   **Fillets**: All edges should have fillets for strength and visual appeal.
*   **Inner diameter**: The inside diameter should be automatically calculated to accommodate `spool_holder_diameter` plus two times `wall_thickness`.
*   **Orientation**: The design should be oriented for 3D printing, with the main body resting flat on the print bed.

I'm looking for a single OpenSCAD file that defines the entire design parametrically. I'm not using any libraries right now, but if something like the `roundedcube()` feature of BOSL2 could be helpful for doing the fillets, I'm open to that.

[Assistant]
remixed-sample-holder.scad:
```
// Parametric Loose Filament Spool Holder by anotherhowie
// is licensed under the Creative Commons - Attribution license.
//
// Edits by stellarinnovation:
// * Spool holder diameter (size of hole) as parameter rather than diameter of spindle
// * Filament clips (on the hooks)
// * Hooks do not protrude beyond spindle_depth. There's even a small gap so that multiple spool holders
//   can be mounted next to eachother.
// * Hex connectors
// * Holes on spindle match number of arms (x2)
// * Fillets for strength and looks

// spool holder diameter (mm)
spool_holder_diameter = 51;

// filament hooks diameter (this is the diameter of your filament) (mm)
hook_diameter = 125;

// the size of the whole holder
outside_diameter = 150;

// depth of the holder
spindle_depth = 27.5;

// how many arms on your holder? (3+)
num_arms = 3;

arm_width = 20;

// how thick all the 'flat' parts should be
wall_thickness = 3;

inner_diameter = spool_holder_diameter + 2*wall_thickness;
hex_diameter = 1*6;

module Hub() {

    difference() {
        union() {
          cylinder(h=spindle_depth - 0.5*wall_thickness, r=inner_diameter/2, $fn=90);
          // flange
          cylinder(h=wall_thickness, r=inner_diameter/2 + wall_thickness, $fn=90);
          // fillet at base of spindle
          cylinder(h=1.5*wall_thickness, r=inner_diameter/2 + 0.5*wall_thickness, $fn=90);
          // top of spindle
          rotate_extrude($fn=90)
            translate([0.5*(inner_diameter - wall_thickness), spindle_depth - 0.5*wall_thickness])
              circle(d=wall_thickness, $fn=24);
        }
        cylinder(h=spindle_depth, r=inner_diameter/2 - wall_thickness, $fn=90);

        // fillet at base of spindle
        rotate_extrude($fn=90)
            translate([0.5*(inner_diameter + wall_thickness), 1.5*wall_thickness])
              circle(d=wall_thickness, $fn=24);

        // holes in spindle
        da = 180/num_arms;
        r = min((spindle_depth - 3*wall_thickness)/2, 0.5*inner_diameter*sin(0.25*da));
        for(a= [0:num_arms-1]) {
            rotate(a*da) translate([-inner_diameter*0.6,0,spindle_depth/2]) rotate(a=90, v=[0,1,0]) cylinder(h=inner_diameter*1.2, r=r);
        }

    }
}

module Arm() {
    translate([-arm_width/2,0,0]) cube([arm_width,(outside_diameter)/2 , wall_thickness]);
    translate([0,outside_diameter/2,0]) cylinder(r=arm_width/2, h=wall_thickness);

    connector_diam = hex_diameter + 4;
    difference() {
        h = spindle_depth - wall_thickness - 1;
        translate([0,hook_diameter/2,0]) cylinder(d=connector_diam, h=h, $fn=24);
        // hex connector
        translate([0,hook_diameter/2,0]) cylinder(d=hex_diameter, h=spindle_depth, $fn=6);
    }

    // Fillets
    r = wall_thickness;
    R = 0.5*inner_diameter + wall_thickness + r;
    x0 = 0.5*arm_width + r;
    y0 = sqrt(R*R - x0*x0);
    difference() {
        linear_extrude(height=wall_thickness)
            polygon([[0,0], [x0,y0], [-x0,y0]]);
        for (x=[-x0, +x0])
            translate([x, y0])
                cylinder(r=r, h=wall_thickness, $fn=24);

    }

    // Fillet at base of hook
    translate([0,hook_diameter/2,0])
        difference() {
            cylinder(r=0.5*(connector_diam + wall_thickness), h=1.5*wall_thickness, $fn=24);

            rotate_extrude($fn=24)
                translate([0.5*(connector_diam + wall_thickness), 1.5*wall_thickness])
                  circle(d=wall_thickness, $fn=24);
        }
}

module Hook() {
    // hex connector
    h = min(spindle_depth - 2*wall_thickness - 2, 15);
    translate([0,hook_diameter/2,0]) cylinder(d=hex_diameter-0.5, h=h,$fn=6);

    hull () {
        translate([0,hook_diameter/2,0]) cylinder(r=arm_width/2, h=wall_thickness);
        translate([0,outside_diameter/2,0]) cylinder(r=arm_width/2, h=wall_thickness);
    }

    // Filament clips
    hole_diam = 3.5;
    r = 0.5*hole_diam + wall_thickness;
    translate([0, 0.5*outside_diameter, r])
        difference() {
            union() {
                rotate([0, 90])
                    cylinder(r=r, h=wall_thickness, center=true);
                translate([-0.5*wall_thickness, -r, -r])
                  cube([wall_thickness, 2*r, r]);
            }

            rotate([0, 90])
                cylinder(d=hole_diam, h=wall_thickness+1, center=true, $fn=24);
        }
}

difference() {

    union() {
        Hub();

        for (a = [1:num_arms]) {
            angle = a*(360/num_arms);
            rotate(a=angle, v=[0,0,1]) Arm();
            rotate(a=angle + 180/num_arms, v=[0,0,1]) Hook();
        }
    }
// punch a hole back through the middle
cylinder(h=spindle_depth, r=inner_diameter/2 - wall_thickness);
}

```