[User]
I'd like to create a plant label that has two lines of text and can be customized. I want to be able to control things like the font, text size, and spacing, as well as the size of the label itself and the stick that goes into the ground.

Specifically, I want the design to allow for:

*   **Two Lines of Text:** I need to specify the text for both the top line and the bottom line.
*   **Font Selection:** I need to choose from a wide variety of Google fonts, like "Pacifico", "Roboto", or "Lobster".
*   **Text Customization:** The size and spacing of each text line should be independently adjustable. I also need to be able to nudge the text up/down and left/right.
*   **Text Height:** I want to control how thick the text is.
*   **Label Style:** I want three options:
    *   **Cutout:** The text is cut out of the label, and the letters are holes.
    *   **OnTop:** The text is extruded on top of the label, so it sticks out.
    *   **Indent:** The text is indented into the surface of the label. For this option, I also want to control the depth of the indent and a small border around the indented area.
*   **Label Dimensions:** The width, height, and depth of the main label part should be adjustable.
*   **Stick Options:** I want to have the option of one or two sticks to go into the soil, and I need to control how wide the sticks are and how long they are. The sticks should be a flat bar with a sort of triangular cut at the bottom of each.

The design should be parametric, so I can change all these variables easily in the OpenSCAD customizer. I don't need to use any libraries.

[Assistant]
Plant_Sign_two_lines.scad:
```
lettering1 = "Tomato";
lettering2 = "'Tigerella'";
// font
style = "Pacifico"; //[Abril Fatface,Aclonica,Acme,Advent Pro,Akronim,Aladin,Alegreya,Alegreya Sans,Alegreya SC,Alex Brush,Alfa Slab One,Alice,Amaranth,Architects Daughter,Archivo Black,Archivo Narrow,Arimo,Arvo,Asap,Astloch,Asul,Averia Libre,Averia Serif Libre,Bangers,Basic,Belgrano,Berkshire Swash,Bigshot One,Bilbo Swash Caps,Black Ops One,Bonbon,Bowlby One SC,Brawler,Bubblegum Sans,Butterfly Kids,Cabin Condensed,Caesar Dressing,Cagliostro,Calligraffitti,Capriola,Carter One,Changa One,Chango,Chelsea Market,Cherry Cream Soda,Chewy,Chicle,Chivo,Clicker Script,Coming Soon,Concert One,Condiment,Cookie,Courgette,Covered By Your Grace,Crimson Text,Dancing Script,DejaVu Sans,DejaVu Serif,Dhurjati,Doppio One,Dosis,Droid Sans,Eagle Lake,Electrolize,Emilys Candy,Encode Sans,Encode Sans Compressed,Euphoria Script,Exo,Exo 2,Faster One,Federo,Finger Paint,Fjord One,Fontdiner Swanky,Freckle Face,Fruktur,Gabriela,Geo,Germania One,Give You Glory,Gloria Hallelujah,Goudy Bookletter 1911,Graduate,Grand Hotel,Great Vibes,Griffy,Hanalei Fill,Happy Monkey,Henny Penny,Hind,IM Fell English SC,Indie Flower,Irish Grover,Italianno,Jacques Francois Shadow,Jolly Lodger,Josefin Slab,Joti One,Judson,Just Another Hand,Kalam,Kameron,Karma,Kavoon,Knewave,Kranky,Kristi,Laila,Lakki Reddy,Lancelot,Lato,Leckerli One,Ledger,Lekton,Lemon One,Liberation Sans,Libre Caslon Text,Life Savers,Lilita One,Lily Script One,Limelight,Lobster,Lobster Two,Londrina Outline,Londrina Shadow,Londrina Solid,Lora,Love Ya Like A Sister,Loved by the King,Lovers Quarrel,Luckiest Guy,Lusitana,Macondo,Macondo Swash Caps,Mako,Marck Script,Margarine,Marko One,Maven Pro,McLaren,MedievalSharp,Merienda One,Merriweather,Mervale Script,Metal Mania,Metrophobic,Milonga,Miltonian Tattoo,Miss Fajardose,Molle,Montez,Montserrat,Mr De Haviland,Mystery Quest,Neucha,New Rocker,Niconne,Nosifer,Nothing You Could Do,Noto Sans Oriya,Noto Serif,Nova Square,Nunito,Old Standard TT,Oleo Script,Oleo Script Swash Caps,Orbitron,Oregano,Orienta,Original Surfer,Oswald,Over the Rainbow,Overlock,Oxygen,Pacifico,Paprika,Parisienne,Patrick Hand SC,Paytone One,Peralta,Permanent Marker,Piedra,Pirata One,Play,Playball,Poetsen One,Poppins,Press Start 2P,Princess Sofia,PT Mono,Qwigley,Racing Sans One,Raleway,Rancho,Ranga,Ribeye,Roboto,Roboto Condensed,Roboto Slab,Rochester,Rock Salt,Rubik One,Sail,Salsa,Sansita One,Sarina,Satisfy,Schoolbell,Seaweed Script,Sevillana,Shadows Into Light,Shadows Into Light Two,Share,Six Caps,Skranji,Source Sans Pro,Spicy Rice,Stardos Stencil,Stoke,Syncopate,Teko,Terminal Dosis,The Girl Next Door,Tillana,Timmana,Titillium Web,Ubuntu,Ultra,Underdog,UnifrakturCook,UnifrakturMaguntia,Vampiro One,Vidaloka,Viga,Voces,Volkhov,Vollkorn,Voltaire,Waiting for the Sunrise,Wallpoet,Wellfleet,Wendy One,Yellowtail,Yesteryear,Zeyada]
labelStyle = "Indent"; //[Cutout,OnTop,Indent]
oneOrTwoSticks = "One"; //[One, Two]

textSpacing = 1; //[1:10]
textSpacing2 = 1; //[1:10]
textSize = 10; //[1:30]
textSize2 = 6; //[1:30]
textNudgeX = 0; //[-100:100]
textNudgeX2 = 0; //[-100:100]
textNudgeY = 10; //[-100:100]
textNudgeY2 = -10; //[-100:100]
textHeight = 1.5; //[0.5:0.5:10.0]
textHeight2 = 1.5; //[0.5:0.5:10.0]

labelWidth = 45.0; //[1:200]
labelHeight = 25.0; //[1:50]
labelDepth = 3.0; //[0.5:0.5:10.0]
//only used for indent style; no sense to make this more than Label Depth; value =
indentDepth = 1.5;
// good idea to make this a multiple of nozzle size
indentEdgeWidth = 1.05;
stickWidth = 4.0; //[0.5:0.5:50.0]
stickLength = 50.0; //[0.5:0.5:200.0]

module label1() {
    difference() {
        cube ([labelWidth, labelHeight, labelDepth], center=true);
        translate([textNudgeX/10,textNudgeY/10,-(labelDepth+1)/2])
        linear_extrude(height=textHeight)
        text (lettering1,  size=textSize, font = style, halign = "center", valign = "bottom", spacing = textSpacing);
    };
}

module label2() {
        cube ([labelWidth, labelHeight, labelDepth], center=true);
        translate([textNudgeX/10,textNudgeY/10,(labelDepth)/2])
        linear_extrude(height=textHeight)
        text (lettering1,  size=textSize, font = style, halign = "center", valign = "bottom", spacing = textSpacing);
}

module label3() {
    difference() {
        cube ([labelWidth, labelHeight, labelDepth], center=true);
        translate([0,0,2*labelDepth/2+labelDepth/2-indentDepth])
        cube ([labelWidth-indentEdgeWidth, labelHeight-indentEdgeWidth, 2*labelDepth], center=true);
    }
        translate([textNudgeX/10,textNudgeY/-10,(labelDepth)/2-indentDepth])
        linear_extrude(height=textHeight)
        text (lettering1,  size=textSize, font = style, halign = "center", valign = "bottom", spacing = textSpacing);
}

module label21() {
    difference() {
        cube ([labelWidth, labelHeight, labelDepth], center=true);
        translate([textNudgeX2/10,textNudgeY2/10,-(labelDepth+1)/2])
        linear_extrude(height=textHeight2)
        text (lettering2,  size=textSize2, font = style, halign = "center", valign = "top", spacing = textSpacing2);
    };
}

module label22() {
        cube ([labelWidth, labelHeight, labelDepth], center=true);
        translate([textNudgeX2/10,textNudgeY2/-10,(labelDepth)/2])
        linear_extrude(height=textHeight2)
        text (lettering2,  size=textSize2, font = style, halign = "center", valign = "top", spacing = textSpacing2);
}

module label23() {
    difference() {
        cube ([labelWidth, labelHeight, labelDepth], center=true);
        translate([0,0,2*labelDepth/2+labelDepth/2-indentDepth])
        cube ([labelWidth-indentEdgeWidth, labelHeight-indentEdgeWidth, 2*labelDepth], center=true);
    }
        translate([textNudgeX2/10,textNudgeY2/10,(labelDepth)/2-indentDepth])
        linear_extrude(height=textHeight2)
        text (lettering2,  size=textSize2, font = style, halign = "center", valign = "top", spacing = textSpacing2);
}

module stick() {
    translate([0,-stickLength/2-labelHeight/2,0])
    difference() {
        cube([stickWidth,stickLength,labelDepth],center=true);
        translate([stickWidth/2,-stickLength/2,0])
        rotate([0,0,45])
        cube([stickWidth,stickWidth,labelDepth+1],center=true);
        translate([-stickWidth/2,-stickLength/2,0])
        rotate([0,0,45])
        cube([stickWidth,stickWidth,labelDepth+1],center=true);
    }
}

if (labelStyle == "Cutout") {
    label1();
    label21();
} else if (labelStyle == "OnTop") {
    label2();
    label22();
} else {
    label23();
    label3();
}

if (oneOrTwoSticks == "One") {
    stick();
} else {
    translate([labelWidth/2-stickWidth/2,0,0])
    stick();
    translate([-(labelWidth/2-stickWidth/2),0,0])
    stick();
}

```


[User]
Hey, I'm looking for an OpenSCAD design for a customizable pegboard clip. I want it to be parametric so I can adjust it for different pegboard and hook sizes. Basically, it should clip onto a pegboard and hold a hook in place.

Here are the key parameters I'm thinking of:

*   **`hole_spacing`:**  The distance between the pegboard holes (e.g., 24.4 mm). This is *L* in my existing code.
*   **`hole_diameter`:** The diameter of the pegboard holes (e.g., 6.35 mm). *D*.
*   **`hook_diameter`:** The diameter of the hook's stem (e.g., 6.35 mm). *d*.
*   **`clip_width`:** The width of the clip itself, which should be smaller than the pegboard hole diameter (e.g., 4 mm). *W*.
*   **`spring_angle`:** An angle controlling the spring action of the clip. Smaller values for more rigid plastics (e.g., 10 degrees). *a*.
*   **`spring_space`:**  Extra space to allow for the spring action of the clip (e.g., 1 mm). *x*.
*   **`bend_thickness`:** The thickness of the rounded part of the clip (e.g., 2 mm). *w*.
*  **`leg_thickness`:** The thickness of the straight parts of the clip (e.g., 2 mm). *v*.
*  **`hook_thickness`:** The thickness of the clip's hook section (e.g., 2 mm). *u*.
*   **`clip_hook_size`:** The depth of the hook part of the clip that catches the pegboard (e.g., 2 mm). *h*. Needs to be larger than the pegboard thickness to secure well.
*   **`clip_hook_notch`:** The size of the notch on the clip hook (e.g., 2mm). *n*.
*   **`bend_fragments`:** The number of segments to use to create the round part of the clip; should be high for smoothness, but this impacts render time (e.g., 48).

The clip needs to have a rounded shape where it inserts into the pegboard hole for a smoother fit. The clip should also include a hook that catches behind the pegboard to prevent it from coming out. The spring action will help keep everything snug. I'd like the design to make use of mirroring to ensure that the legs are symmetric. It's important that two clips should be able to fit within a single pegboard hole, as long as the thickness parameters allow.

I was hoping you could generate a single .scad file for the entire clip. I don't need any extra libraries. Could you do that?

[Assistant]
customizable_pegboard_clip.scad:
```
//
// Customizer UI
//

// (mm) distance between nearby pegboard's holes
hole_spacing = 24.4;
L = hole_spacing;

// (mm) diameter of a pegboard's hole
hole_diameter = 6.35;
D = hole_diameter;

// (mm) diameter of a pegboard's hook
hook_diameter = 6.35;
d = hook_diameter;

// (mm) width of the clip; must be smaller than the diameter of a pegboard's hole
clip_width = 4;
W = clip_width;

// 0-90; pick smaller values for more rigid plastic
spring_angle = 10;
a = spring_angle;

// (mm) extra space to allow for the spring action
spring_space = 1;
x = spring_space;

// (mm) thickness of the clip's round part
bend_thickness = 2;
w = bend_thickness;

// (mm) thickness of the clip's long parts
leg_thickness = 2;
v = leg_thickness;

// (mm) thickness of the clip's hook
hook_thickness = 2;
u = hook_thickness;

// (mm) size of the clip's hook; must be larger than the pegboard's thickness
clip_hook_size = 2;
h = clip_hook_size;

// (mm) size of the notch on the clip's hook
clip_hook_notch = 2;
n = clip_hook_notch;

// number of round part's fragments; more is smoother, but slower
bend_fragments = 48; // [24, 32, 48, 72, 96]
$fn = bend_fragments;

//
// Convenience variables
//

m = D/100;
R = D/2;
r = d/2;
s = r + w;
y = (D - sqrt(D*D - W*W))/2;
l = L - r - R + y;

//
// Scene
//

union()
{
    ClipLeg();

    ClipBend();

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

//
// Parts of the clip
//

module ClipLeg()
{
    rotate([0, 0, a])
    union()
    {
        // Straight part
        linear_extrude(height = W)
        translate([r, -(r + x)])
        polygon([
            [0, 0],
            [l + u, 0],
            [l + u, v],
            [w, v],
            [w, r + x + m],
            [0, r + x + m]
        ]);

        // Hook
        translate([r + l + u, -(r + x), 0])
        translate([R - (n + u), -h, W/2])
        rotate([90, 0, 0])
        difference()
        {
            union()
            {
                hull()
                {
                    union()
                    {
                        cylinder(h = m, d = D);

                        translate([R + u - m, 0, u/2])
                        cube([m, D, u], center = true);
                    }

                    translate([u, 0, u - m])
                    cylinder(h = m, d = D);
                }

                translate([n, 0, -(h + m)])
                cylinder(h = m + h + m, d = D);
            }

            translate([n + u + R, 0, 0])
            cube(2*D, center = true);

            translate([0, D + W/2, 0])
            cube(2*D, center = true);

            translate([0, -(D + W/2), 0])
            cube(2*D, center = true);
        }
    }
}

module ClipBend()
{
    mask = [
        [s, 0],
        [s, -s],
        [-s, -s],
        [-s, 0]
    ];

    linear_extrude(height = W)
    difference()
    {
        circle(r = s);

        circle(r = r);

        rotate([0, 0, a])
        polygon(mask);

        rotate([0, 0, -a])
        polygon(mask);
    }
}

```


[User]
I'd like to create a parametric pencil clip and protector for notebooks with elastic band closures. I have some specific requirements and features I'd like included.

First, the design should consist of a clip that attaches to the notebook by gripping the elastic band. There should be two clip sections available, a top clip that has a longer extension to protect the pencil tip, and a second clip that is mostly just a retaining mechanism for the pencil's body. Both clips are cylinder-like with an extruded band-gripping section and a cutout for the pencil itself.

I need to be able to configure the width and height of the elastic band, as well as the pencil's diameter and the length of the pencil tip protector. Also, I need to be able to turn the two clips on or off and specify whether or not the second clip allows a pull-out without having to slide the clip along the pencil.

Here are the specific parameters I'd like:

*   `elastic_band_width`: Width of the elastic band.
*   `elastic_band_height`: Height of the elastic band.
*   `pencil_diameter`: Diameter of the pencil.
*   `pencil_tip_height`: Height of the pencil tip protector on the top clip.
*   `top_clip`: Boolean to enable/disable the top clip.
*   `second_clip`: Boolean to enable/disable the second clip.
*  `second_clip_pull`: Boolean to allow the second clip to be used without sliding it down the pencil.

The dimensions for the clips should be calculated from the given parameters to ensure a snug fit around the pencil and the elastic band. The second clip, if used, should be positioned appropriately relative to the first clip. If the band is wide enough to require a wider separation of the clips than the pencil would, the second clip must be moved farther away. If both clips are enabled, the second clip should be positioned so that it will hold the pencil below the first clip, with an offset to be configurable if needed.

I am expecting a single .scad file that implements this design with all of the required parameters exposed for modification. The design should use basic OpenSCAD primitives and standard operations; no libraries should be necessary.

[Assistant]
pencil_clip.scad:
```
// pencil clip & protector for notebook with band closure
// version 0.2.0
// by pixelhaufen
// is licensed under CC BY-SA 3.0 -> https://creativecommons.org/licenses/by-sa/3.0/

//------------------------------------------------------------------
// User Inputs

/*[(elastic) band]*/
elastic_band_width = 6; // [4:0.1:15]
elastic_band_height = 1; // [0.5:0.1:2]

/*[pencil]*/
pencil_diameter = 7.3; // [5:0.1:15]
pencil_tip_height = 16; // [10:25]

/*[clips]*/
top_clip = "yes"; // [yes,no]
second_clip = "yes"; // [yes,no]
second_clip_pull = "no"; // [yes,no]

/*[Hidden]*/
// speed vs. resolution
$fn = 60; // looks like this can't be modified on thingiverse

pencil_inner_radius = pencil_diameter/2;
pencil_outer_radius = pencil_inner_radius + 1;
pencil_clip_tip_height = pencil_tip_height + 1;
clip_connector_height = 8;

//------------------------------------------------------------------
// Main

if(top_clip=="yes")
{
    clip(true);

    if(second_clip=="yes")
    {
        if((elastic_band_width+2) > (pencil_outer_radius*2+2))
        {
            translate([0,elastic_band_width+4,0])
            {
                clip(false);
            }
        }
        else
        {
            translate([0,pencil_outer_radius*2+2,0])
            {
                clip(false);
            }
        }
    }
}
else
{
    if(second_clip=="yes")
    {
        clip(false);
    }
}

//------------------------------------------------------------------
// Module

module clip(top)
{
    difference()
    {
        // shell
        union()
        {
            cylinder(h=clip_connector_height, r1=pencil_outer_radius, r2=pencil_outer_radius, center=false);
            translate([0,(elastic_band_width/-2)-1,0])
            {
                cube([pencil_outer_radius+elastic_band_height+0.5,elastic_band_width+2,clip_connector_height],center=false);
            }

            if(top)
            {
                translate([0,0,clip_connector_height])
                {
                    cylinder(h=pencil_clip_tip_height, r1=pencil_outer_radius, r2=2.2, center=false);
                }
            }
        }

        // remove inner
        union()
        {
            cylinder(h=clip_connector_height, r1=pencil_inner_radius, r2=pencil_inner_radius, center=false);
            translate([pencil_inner_radius+0.5,elastic_band_width/-2,0])
            {
                cube([elastic_band_height,elastic_band_width,clip_connector_height+pencil_clip_tip_height],center=false);
            }

            translate([pencil_outer_radius*-1,elastic_band_height*-1,0])
            {
                cube([pencil_outer_radius*2,elastic_band_height*2,clip_connector_height+pencil_clip_tip_height],center=false);
            }

            if(top)
            {
                translate([0,0,clip_connector_height])
                {
                    cylinder(h=pencil_clip_tip_height, r1=pencil_inner_radius, r2=1.2, center=false);
                }
            }
            else if(second_clip_pull == "no")
            {
                linear_extrude(height = clip_connector_height+pencil_clip_tip_height, twist = 0)
                {
                    polygon(points=[[pencil_outer_radius,0], [pencil_outer_radius*-1,pencil_outer_radius], [pencil_outer_radius*-1,pencil_outer_radius*-1]]);
                }
            }

        }
    }
}

```


[User]
I need help designing a parametric skirting board corner and end cap. I'm using skirting boards from leiste24.de, specifically the 60mm white ones (https://www.leiste24.de/weisse-sockelleisten/43/dekor-sockelleiste-60mm-weiss-aehnlich-ral-9010), and I want to create both end pieces and corner pieces with an adjustable angle.

The skirting board profile has a height of 60mm. The bottom width is approximately 21mm and the top width is approximately 14mm. There's a kind of curved edge at the top, with a radius of about 3mm where the top width meets the height, and the overall thickness of the skirting board material is around 2mm.

For the design I'd like the following parameters:

*   `o_height`: The overall height of the skirting board (should default to 60).
*   `o_top_width`: The top width of the skirting board (should default to 14).
*   `o_bottom_width`: The bottom width of the skirting board (should default to 21).
*   `wall_thickness`: The material thickness (should default to 2).
*   `edge_radius`: The radius of the top edge (should default to 3).
*   `overlap`: The depth of the corner piece that overlaps the skirting board (should default to 5).
*   `flap_length`: The length of the mounting flap (should default to 10).
*   `flap_overlap`: How much the mounting flap extends (should default to 8).
*   `angle`:  The corner angle. 0 for right end cap, 360 for left end cap, any value in between to create the corner piece.

The end caps should be mirrored, and for corner pieces there needs to be two mating parts for the inner and outer corners of the wall. The mounting flaps should be small, roughly triangular pieces with a small peg on them for fitting into the wall, these should appear on both the end caps and corners. These should be positioned so as to allow a screw to fit through the gap.

Can you generate an OpenSCAD file (or files) that does this?

[Assistant]
fussleiste.scad:
```
$fa=5;
$fs=0.1;

o_height = 60;
o_top_width = 14;
o_bottom_width = 21;

wall_thickness = 2;

edge_radius = 3;

overlap = 5;

flap_length = 10;
flap_overlap = 8;

angle = 45; // 0 is right end, 360 is left end, others create edges

module slice(r = 10, deg = 30) {
/* This is taken from the mailing list:
http://forum.openscad.org/Creating-pie-pizza-slice-shape-need-a-dynamic-length-array-td3148.html
*/
  degn = (deg % 360 > 0) ? deg % 360 : deg % 360 + 360;
  difference() {
    circle(r);
    if (degn > 180) intersection_for(a = [0, 180 - degn])
      rotate(a) translate([-r, 0, 0]) square(r * 2);
    else
      union() for(a = [0, 180 - degn]) rotate(a) translate([-r, 0, 0]) square(r * 2);

  }
}

module outer() {
  hull() {
    translate([o_top_width-edge_radius, o_height-edge_radius]) circle(r=edge_radius);

    polygon([ [0,0], [o_bottom_width,0], [o_top_width-edge_radius, o_height-edge_radius], [0, o_height]   ]);
  }
}

module inner() {
  hull() {
    translate([o_top_width-edge_radius-wall_thickness, o_height-edge_radius-wall_thickness]) circle(r=edge_radius);

    polygon([ [-0.1,-0.1], [o_bottom_width-wall_thickness,-0.1], [o_top_width-edge_radius-wall_thickness, o_height-edge_radius-wall_thickness], [-0.1, o_height-wall_thickness]   ]);
  }
}

module flap() {
  linear_extrude(flap_overlap)
    polygon([[0,0], [wall_thickness/2, 0], [wall_thickness/2, flap_length], [0, flap_length]]);
  for (x = [flap_length/4, flap_length/2, 3*(flap_length/4)]) {
    translate([wall_thickness/2, x, 0])
      cylinder(h=flap_overlap*0.6, d1=wall_thickness*0.7, d2=wall_thickness/3);
  }
}

module full_mount() {
  difference() {
    linear_extrude(overlap + wall_thickness) outer();
    translate([0,0,wall_thickness]) linear_extrude(overlap*1.01) inner();
  }

  translate([0, o_height-9-flap_length, 0]) flap();

  translate([o_bottom_width-8, 3, 0])
    rotate([0,0,90-61.14]) flap();
}

if (0 == angle) {
  full_mount();
} else if (360 == angle) {

  mirror([1,0,0]) full_mount();
} else {
  translate([0,0,-0.1])full_mount();
  rotate([0,-180+angle,0])
  mirror([1,0,0]) full_mount();
  rotate([0,-1,0])
  difference() {
    rotate([-90,0,0]) rotate_extrude() outer();
    translate([0,-1,0]) rotate([-90,0,0])
      linear_extrude(o_height+2)  slice(o_bottom_width+2, 360-(angle+2));

  }
}

```


[User]
I'd like to design a custom bike handle grip. I need an OpenSCAD file that will let me specify the handlebar diameter, the length of the grip, and have it print with an inscription around the circumference of the grip.

Ideally, the grip should have a slightly rounded edge at the end, where it meets the handlebar, and the inscription should be raised. It will be printed in a flexible material (like TUP or Polyflex), so the fit should be relatively tight.

I need the following to be parametric:

*   `handle_mm`: The diameter of the handlebars in millimeters (with a suggested range of 20-25mm).
*   `handle_lenght`: The length of the grip in millimeters (suggested range of 50-200mm).
*   `Inscription`: A text string for the inscription.

I don't need to adjust the thickness of the grip itself, or any hidden variables; just those three user-facing parameters. I'd also like to be able to vary the `$fn` parameter from the code to adjust how smooth the curves are (default to 50).

Can you generate the OpenSCAD file for me?

[Assistant]
Bike_Handle_Grip_Customizer.scad:
```
//Insert the diameter of your handle bars in millimeters.
handle_mm = 22;// [20:25]
//Insert the lenght of your grip in millimeters.
handle_lenght = 130; // [50:200]
//Insert the inscription that you would like to use as a grip.
Inscription = "Insert words here";//

/* [Hidden] */
thickness = 10;
grip= handle_mm+ thickness;
$fn=50;

module topround(){
difference (){
    translate ([-0,0,0])
    sphere(d=grip+40);
    translate ([-0,0,0])
    sphere(d=grip+19);
     translate ([0,0,-40])
    cube ([50*2,50*2,80],center = true);
}}

difference (){
cylinder (handle_lenght, d=grip, d=grip);
cylinder (handle_lenght-10, d=handle_mm, d=handle_mm);
translate ([0,0,handle_lenght-handle_mm])topround();
    }
module name (){
translate ([20,0,20]) rotate ([0,90,0])
linear_extrude( height =4){text (Inscription, size = 10);}}

 for(i=[0:45:360]) {

  rotate([0,0,i])
translate([handle_mm-29,-6,handle_lenght-27])

name();
}

```


[User]
I'm building a self-watering planter and I need a base for the fill pipe. I've got a 3/4 inch copper pipe I'll be using to fill the reservoir, and I want a 3D printed base that will hold it upright and allow water to flow out the bottom.

The base should have three main sections. The top section will be a sleeve that the copper pipe slides into – this part needs to be snug but not so tight it's difficult to insert the pipe. Then, there should be a slightly narrower section below it. The copper pipe shouldn't slide past this point. Finally, there's a solid base at the bottom. The lower middle section needs slots cut into it so water can flow freely from the pipe out into the reservoir.

Here's the specifics:

*   The whole thing should be a cylinder.
*   **Overall cylinder diameter:** 30mm
*   **Upper section (pipe sleeve):**
    *   Height: 45mm
    *   Inside Diameter: 23mm (This is the diameter I'd want to fit my pipe)
*   **Lower section (slotted section):**
    *   Height: 30mm
    *   Inside diameter: 20.5mm (This is to stop the pipe from sliding down)
    *   Lip height (distance between lip and the top of the slots): 5mm
    *   Number of slots: 6
    *   Slot Width: 7mm
*   **Base:**
    *   Height: 3mm

I'd like the OpenSCAD file(s) to be parametric so I can easily tweak the dimensions. I'm not using any specific libraries at the moment, so if there are any useful ones to use for this, please let me know. Thanks!

[Assistant]
Watering_Pipe_Base.scad:
```
//The overall cylinder is divided into 3 sections:
// The upper section:  The copper pipe inserts into this section.
// The lower section:  This section is slightly narrower so the pipe will not be able to slide down into this section.  The slots will be removed from this section.
// The base:  This is a solid circle that acts as the base.

//Variables

/* [Full Length] */
// Outside diameter of entire cylinder
outside_Diameter = 30;

/* [Upper Section] */
//Height of the upper section
upperSection_Height = 45;
//Inside diameter of the upper section (Must be < Outside Diameter)
upperSection_InsideDiameter = 23;

/* [Lower Section] */
//Height of the lower section
lowerSection_Height = 30;
//Inside diameter of the lower section (Must be < Outside Diameter)
lowerSection_InsideDiameter = 20.5;
//Inner Lip Height (Distance between lip and top of slots.  Must be < height of the lower section)
innerLip_Height = 5;
//Number of slots.  Must be multiple of 2.
numSlots = 6; //[0:2:50]
//Width of the slots
slot_Width = 7;

/* [Base] */
//Height of the base (Will add to the overall height)
base_Height = 3;

//Calcs
    total_Height = base_Height + lowerSection_Height + upperSection_Height;
    slot_Height = lowerSection_Height - innerLip_Height;

//Generate object
    difference () {
        //Outside Cylinder
        cylinder(h = total_Height, d = outside_Diameter, $fn=360);
        //Cutout lower Cylinder
        translate([0, 0, base_Height])  cylinder(h = lowerSection_Height + .01, d = lowerSection_InsideDiameter, $fn=360);
        //Cutout Upper Cylinder
        translate([0, 0, base_Height + lowerSection_Height]) cylinder(h = upperSection_Height + 2, d = upperSection_InsideDiameter, $fn=360);

        //Cutouts in lower section
        rotationDegrees = 360 / numSlots;
        translate([0, 0, (slot_Height/ 2) + base_Height]) {
            for (i = [1 : numSlots / 2]) {
                rotate(a = rotationDegrees * i) {
                    cube([outside_Diameter, slot_Width, slot_Height], center = true);
                }
            }
        }
    }
/*
3/4 Inch pipe dimensions
    Inside:         0.811 Inches | 20.5994 mm
    Wall Thickness: 0.032 Inches |  0.8128 mm
    Outside:        0.875 Inches |  22.225 mm
*/
```


[User]
I'd like to design a small, 3D-printable bit chuck for use with a standard 1/4" hex driver. It should be parametric so I can adjust it for different bit sizes and other factors. I've attached a reference file, `Small_Bit_Chuck.scad`, which contains a rough design, but I'd prefer something cleaner and more maintainable. Here's what I'm looking for:

The chuck will consist of three main parts: a shaft adapter that fits into the 1/4" hex driver, a collet that holds the bit, and a chuck nut to tighten the collet.

**Shaft Adapter:**

*   It should have a standard 1/4" hex drive that can be inserted into the driver.
*   The shaft should have a specified length for deeper insertion into the collet.

**Collet:**

*   It needs to have a threaded exterior on the part that is in contact with the chuck nut.
*   The collet should have a stem that extends into the chuck nut.
*   It should have a tapered tip that tightens down on the bit. This portion needs to be split into jaws to clamp the bit.
*   I need to be able to control the number of jaws on the collet.
*   The collet needs to accommodate a specified bit diameter, and I'd like a small amount of tolerance built in.
*   I would like the option to specify the length of the threaded portion of the collet, as well as the length of the collet tip and stem.

**Chuck Nut:**

*   The nut needs to have an internal thread that matches the collet's external thread.
*   I need to be able to specify the outside diameter of the chuck nut.
*   The chuck nut needs to be able to accommodate the collet when the collet is tightened down.

**Parameters:**

I need to be able to customize these parameters:

*   `bitd`: Diameter of the bit (e.g., 3.175mm)
*   `shaftlen`: Length of the 1/4" hex drive
*   `shaftd`: Diameter of the 1/4" hex drive (7.1mm)
*   `tolerance`: A tolerance value that could be used to help the fit when 3D printed, for example 0.4mm.
*   `colletd`: Diameter of the collet's main body
*   `colletlen`: Length of the threaded portion of the collet
*   `tiplen`: Length of the collet tip
*   `stemlen`: Length of the collet stem that inserts into the chuck nut
*   `chuckd`: Diameter of the chuck nut
*   `njaws`: Number of jaws on the collet (3 or 4)

**Additional Requirements:**

*   I need to be able to generate each of the three parts independently and all of the parts assembled. I'd like to be able to choose the part to generate through a `part` parameter with "all", "shaft", "collet", or "chuck" options.
*   I need to be able to control the detail of curves, using `$fn` or a similar method. I think a good default is 72.
*   I would prefer to not use `hull()` where possible, and if it is used, it should be for simple operations only.
*   I would prefer it if the threads were generated using a more modern approach that uses the BOSL2 library if possible.

Could you generate a parametric OpenSCAD file or files for this, using the BOSL2 library for threads and other complex geometries, keeping these requirements in mind? I'd like the design to be clean and easy to understand, and be relatively well-optimized.

[Assistant]
Small_Bit_Chuck.scad:
```
part = "collet";	// [all, shaft, collet, chuck]

// Diameter of bit
bitd = 3.175;

// Length of 1/4" hex drive
shaftlen = 30;

// Shaft diameter (1/4")
shaftd = 7.1;

// Fit fudge factor (nozzle width is usually good)
tolerance = 0.4;

// Collet diameter
colletd = 12;

// Collet screw length
colletlen = 10;

// Collet tip length
tiplen = 5;

// Collet stem length. This is also how deep the
// shaft goes in, so longer gives less runout.
stemlen = 10;

// Diameter of chuck nut
chuckd = 18;

// Number of jaws on the collet
njaws = 3;	// [3,4]

$fn=72;

module shaft() {
	difference() {
		cylinder(d=shaftd, h=shaftlen, $fn=6);

		// FIXME: approximate
		translate([0,0,9]) rotate_extrude()
			translate([6.7,0]) circle(d=9);
	}
}

module collet() {
	difference() {
		union() {
			translate([0,0,stemlen]) union() {
				intersection() {
					rotate([180,0,0]) mirror([0,0,1])
					thread(4, colletd/2, .5/36, 4, 3/2, 4);
					union() {
						translate([0,0,colletlen-4])
							cylinder(d1=colletd+4,d2=colletd,4);
						translate([0,0,4])
							cylinder(d=colletd+4,h=colletlen-8);
						cylinder(d2=colletd+4,d1=colletd,4);
					}
				}
				cylinder(d1=colletd,d2=colletd-2,
					h=colletlen);
			}

			translate([0,0,stemlen+colletlen])
				cylinder(d1=colletd-2,d2=bitd*2,h=tiplen);

			cylinder(d=colletd,h=stemlen,$fn=6);

			// supportless is nice
			hull() {
				translate([0,0,stemlen-3])
					cylinder(d=colletd-2,h=stemlen,$fn=6);
				translate([0,0,stemlen])
					cylinder(d1=colletd,h=1);
			}
		}
		cylinder(d=shaftd+tolerance,h=stemlen-.1,$fn=6);
		cylinder(d=bitd,h=colletlen*+stemlen+tiplen+1);
		cutd = bitd/2;
		for(a=[0:360/njaws:359]) {
			rotate([0,0,a])
			translate([-cutd/2,0,stemlen+0.1])
				cube([cutd,colletd,colletlen+tiplen]);
		}
	}
}

module chuck() {
	difference() {
		hull() {
			cylinder(d=chuckd,h=colletlen/2,$fn=6);
			cylinder(d=colletd+3,h=colletlen);
		}
		translate([0,0,-4])
		rotate([180,0,0]) mirror([0,0,1])
			thread(4, colletd/2+tolerance, .5/36, 4, 3/2, 4);
		cylinder(d=colletd,h=colletlen);
	}
}

if( part == "all" ) {
	color("gray") shaft();
	translate([0,0,shaftlen-5]) collet();
	color("green")
		translate([0,0,shaftlen+colletlen+stemlen]) chuck();
} else if( part == "collet" ) {
	collet();
} else if( part == "chuck" ) {
	rotate([180,0,0]) chuck();
} else if( part == "shaft" ) {
	rotate([90,0,0]) shaft();
}

////////////////////////////////////////
// FIXME: this really should use sweep or something
// more modern
fastthread = 0;
easythread = 0;

// spread - rise per turn
// radius - initial radius of first thread
// taper - inwards taper per 10 degrees(i.e. .225/36)
// turns - number of revolutions total
// threadr - radius of thread
// threadstep - length of each thread segment
module thread(spread,radius,taper,turns,threadr,threadstep) {
	if( fastthread ) {
		for(i=[0:18*turns]) {
			translate([sin(i*20)*(radius-i*2*taper),cos(i*20)*(radius-i*2*taper),i*spread/18])
			rotate ([90-5,-25,90-i*20-11])
				cylinder(r = threadr, h=threadstep,$fn=5);
		}
   } else if( easythread ) {
		for(i=[1:36*turns],j=i-1) {
         hull() {
            translate([sin(i*10)*(radius-i*2*taper),cos(i*10)*(radius-i*2*taper),i*spread/36])
            rotate ([90-5,-25,90-i*10-11])
               circle(r = threadr,$fn=5);
            translate([sin(j*10)*(radius-j*2*taper),cos(j*10)*(radius-j*2*taper),j*spread/36])
            rotate ([90-5,-25,90-j*10-11])
               circle(r = threadr,$fn=5);
         }
		}
	} else {
		for(i=[1:36*turns],j=i-1) {
			hull() {
		translate([sin(i*10)*(radius-i*taper),cos(i*10)*(radius-i*taper),i*spread/36])
				sphere(r=threadr, $fn=10);
		translate([sin(j*10)*(radius-j*taper),cos(j*10)*(radius-j*taper),j*spread/36])
				sphere(r=threadr, $fn=10);
			}
		}
	}
}

```


[User]
I'm looking for an OpenSCAD design for a parametric kitchen knife sheath. It should work for pretty much any pointy knife. I'd like to be able to specify the knife blade's length, maximum width, and thickness as parameters. The sheath should also have an adjustable wall thickness.

Ideally, it would have optional "windows" on alternating sides so you can see the blade without taking it out. It would be great if you could also add an option for ridges inside the sheath for a more secure fit. And finally, the mouth of the sheath shouldn't be just a straight cut; I'd like to specify the angle of the cut-off at the grip.

All measurements should be in millimeters. I'd really like to be able to adjust things like the number of windows, if I choose to have them, and that angle of the mouth at the grip. It should allow for both positive and negative angles of the cut-off.

I don't need it to be super fancy, just functional and easily customizable. No specific external libraries are required.

[Assistant]
Parametric_Kitchen_Knife_Sheath.scad:
```
// parametric knife sheath
// original by Steve Pendergrast (vorpal)
// https://www.thingiverse.com/thing:125109
//
// remix v4 by BikeCyclist: Bugfix for better walls with windows at high grip cutoff angles
// remix v3 by BikeCyclist: Bugfix (windows in thick walls) as suggested by Laurie, improved use of thingiverse customizer interface, better walls with windows at high grip cutoff angles
// remix v2 by BikeCyclist: Parametric wall thickness, shorter ridges, better symmetry
// remix v1 by BikeCyclist: Introducing holding ridge and oblique cut-off at grip
// https://www.thingiverse.com/thing:2856699

// length: the length of the blade from handle to tip
// maxwidth: the maximum width of the blade
// tipwidth:  the width near the tip, zero means it comes to a point
// thickness: maximum thickness of the blade
// has_windows:  0 = do not put in windows to show the blade and simplify cleaning
// has_ridges: 0 = do not add ridges to the sheath to hold the knife by friction
// grip_cutoff_angle:  the angle of the mouth of the sheet at the grip (off the vertical)
//
// all measurements are in mm

//CUSTOMIZER VARIABLES

//	Knife length, mm
knife_length = 115;	//	[25:350]

//	Knife Max Blade width, mm
knife_width = 18;	//	[10:100]

//	Knife thickness, mm
knife_thickness = 1.5;

//	Wall thickness, mm
wall_thickness = 0.5;

// Show knife through windows?
has_windows = 1; // [0:No, 1:Yes]

// Number of windows per side
number_of_windows = 10; // [1:25]

// Sheath has ridges to hold the knife more securely?
has_ridges = 0; // [0:No, 1:Yes]

// Angle of the sheath at the grip (0 = vertical) [0:75]
grip_cutoff_angle = 20;

//CUSTOMIZER VARIABLES END

$fn = 80*1;  // while debugging reduce this to 20 to save time

wall = 2*wall_thickness;
pad = 2*1;

translate ([0, 0, knife_width + 2 * wall + pad])
    rotate ([0, 180, 0])
        parasheath (length = knife_length, maxwidth = knife_width, thickness = knife_thickness, windows = has_windows);

module parasheath(length=200, maxwidth=25, thickness=2, windows=1) {

    difference() {

        union () {

            difference() {

                // first make an oversized blade, oversized by 2 times the wall thickness
                blade(len = length + wall + pad, maxwid = maxwidth + pad + 2 * wall, thick = thickness + 2 * wall);

                translate([0, 0, wall])
                    blade(len = length + 0.1 + pad, maxwid = maxwidth + pad, thick = thickness);

            }

            if (has_ridges)
            for (i = [-1, 1])
                translate([0, 0, wall + knife_width/2 + pad/2])
                    translate ([i * knife_thickness/2, 0, 0])
                        rotate ([-90, 0, 0])
                            scale ([1, 2, 1])
                                cylinder (d = knife_thickness / 2, h = length/8);

        }

        if (windows)
            intersection ()
            {
                {
                    straight_length = length - maxwidth * sin (grip_cutoff_angle);
                    for (j = [-1, 1])
                        for (i = [1 : number_of_windows])
                            translate([j * (wall + thickness), maxwidth * sin (grip_cutoff_angle) + straight_length/number_of_windows * i + straight_length/(4 * number_of_windows) * j, maxwidth/2 + wall + pad/2])
                                    cube([2 * (wall + thickness), straight_length/(2 * number_of_windows), maxwidth + pad], center = true);
                }

                translate([0, 0, wall])
                    blade(len = length + 0.1 + pad - wall, maxwid = maxwidth + pad, thick = 2 * thickness + 4 * wall);
            }

        rotate ([-grip_cutoff_angle, 0, 0])
            translate([0, -100, 0])
                    cube([200,200,200], center=true);
    }

    /* Ensure windows don't cut through the mouth edges of the sheath */
    if (windows)
        difference ()
        {
            maxwid = maxwidth + pad + 2 * wall;

            hull ()
            {
                rotate ([-grip_cutoff_angle, 0, 0])
                    translate([0, 0, 0.5 * maxwid / cos (grip_cutoff_angle)])
                        cube ([thickness + 2 * wall, 0.01, maxwid / cos (grip_cutoff_angle)], center = true);

                translate([0, wall / cos (grip_cutoff_angle), 0])
                    rotate ([-grip_cutoff_angle, 0, 0])
                        translate([0, 0, 0.5 * maxwid / cos (grip_cutoff_angle)])
                            cube ([thickness + 2 * wall, 0.01, maxwid / cos (grip_cutoff_angle)], center = true);
            }

            hull ()
            {
                translate([0, -wall / cos (grip_cutoff_angle), 0])
                    rotate ([-grip_cutoff_angle, 0, 0])
                        translate([0, 0, 0.5 * maxwid / cos (grip_cutoff_angle)])
                            cube ([thickness, 0.01, (maxwidth + pad) / cos (grip_cutoff_angle)], center = true);

                translate([0, 2 * wall / cos (grip_cutoff_angle), 0])
                    rotate ([-grip_cutoff_angle, 0, 0])
                        translate([0, 0, 0.5 * maxwid / cos (grip_cutoff_angle)])
                            cube ([thickness, 0.01, (maxwidth + pad) / cos (grip_cutoff_angle)], center = true);
            }
        }
}

module blade (len = 200, maxwid = 25, tipwid = 5, thick = 2)
{
    translate ([-thick/2, 0, 0])
        union() {
            intersection() {
                    // first make a cube
                    cube([thick, len, maxwid]);

                    translate([0,len-maxwid,maxwid])
                        rotate([0,90,0])
                            cylinder(r=maxwid,h=thick*3,center=true);
            }

            cube([thick,len-maxwid,maxwid]);
        }
}
```
Parametric_Kitchen_Knife_Sheath_V5.scad:
```
// parametric knife sheath
// original by Steve Pendergrast (vorpal)
// https://www.thingiverse.com/thing:125109
//
// remix v5.01 by BikeCyclist: Now supports negative grip cutoff angles
// remix v4 by BikeCyclist: Bugfix for better walls with windows at high grip cutoff angles
// remix v3 by BikeCyclist: Bugfix (windows in thick walls) as suggested by Laurie, improved use of thingiverse customizer interface, better walls with windows at high grip cutoff angles
// remix v2 by BikeCyclist: Parametric wall thickness, shorter ridges, better symmetry
// remix v1 by BikeCyclist: Introducing holding ridge and oblique cut-off at grip
// https://www.thingiverse.com/thing:2856699

// length: the length of the blade from handle to tip
// maxwidth: the maximum width of the blade
// tipwidth:  the width near the tip, zero means it comes to a point
// thickness: maximum thickness of the blade
// has_windows:  0 = do not put in windows to show the blade and simplify cleaning
// has_ridges: 0 = do not add ridges to the sheath to hold the knife by friction
// grip_cutoff_angle:  the angle of the mouth of the sheet at the grip (off the vertical)
//
// all measurements are in mm

//CUSTOMIZER VARIABLES

//	Knife length, mm
knife_length = 115;	//	[25:350]

//	Knife Max Blade width, mm
knife_width = 18;	//	[10:100]

//	Knife thickness, mm
knife_thickness = 1.5;

//	Wall thickness, mm
wall_thickness = 0.5;

// Show knife through windows?
has_windows = 1; // [0:No, 1:Yes]

// Number of windows per side
number_of_windows = 10; // [1:25]

// Sheath has ridges to hold the knife more securely?
has_ridges = 0; // [0:No, 1:Yes]

// Angle of the sheath at the grip (0 = vertical) [-75:75]
grip_cutoff_angle = 20;

//CUSTOMIZER VARIABLES END

$fn = 80*1;  // while debugging reduce this to 20 to save time

wall = 2*wall_thickness;
pad = 2*1;

translate ([0, 0, knife_width + 2 * wall + pad])
    rotate ([0, 180, 0])
        parasheath (length = knife_length, maxwidth = knife_width, thickness = knife_thickness, windows = has_windows);

module parasheath(length=200, maxwidth=25, thickness=2, windows=1)
{
    difference()
    {
        union ()
        {
            sheathwid = maxwidth + pad + 2 * wall;
            extralen = (grip_cutoff_angle<0?sheathwid * tan (-grip_cutoff_angle):0);
            sheathlen = length + wall + pad + extralen;

            translate ([0, -extralen, 0])
            difference()
            {
                // first make an oversized blade, oversized by 2 times the wall thickness

                blade(len = sheathlen, maxwid = sheathwid, thick = thickness + 2 * wall);

                translate([0, 0, wall])
                blade(len = length + 0.1 + pad + extralen, maxwid = maxwidth + pad, thick = thickness);

            }

            if (has_ridges)
            for (i = [-1, 1])
                translate([0, 0, wall + knife_width/2 + pad/2])
                    translate ([i * knife_thickness/2, 0, 0])
                        rotate ([-90, 0, 0])
                            scale ([1, 2, 1])
                                cylinder (d = knife_thickness / 2, h = length/8);

        }

        if (windows)
            intersection ()
            {
                {
                    straight_length = length - maxwidth * sin (grip_cutoff_angle);
                    for (j = [-1, 1])
                        for (i = [1 : number_of_windows])
                            translate([j * (wall + thickness), maxwidth * sin (grip_cutoff_angle) + straight_length/number_of_windows * i + straight_length/(4 * number_of_windows) * j, maxwidth/2 + wall + pad/2])
                                    cube([2 * (wall + thickness), straight_length/(2 * number_of_windows), maxwidth + pad], center = true);
                }

                translate([0, 0, wall])
                    blade(len = length + 0.1 + pad - wall, maxwid = maxwidth + pad, thick = 2 * thickness + 4 * wall);
            }

        rotate ([-grip_cutoff_angle, 0, 0])
            translate([0, -1000, 0])
                    cube([2000,2000,2000], center=true);
    }

    /* Ensure windows don't cut through the mouth edges of the sheath */
    if (windows)
        difference ()
        {
            maxwid = maxwidth + pad + 2 * wall;

            hull ()
            {
                rotate ([-grip_cutoff_angle, 0, 0])
                    translate([0, 0, 0.5 * maxwid / cos (grip_cutoff_angle)])
                        cube ([thickness + 2 * wall, 0.01, maxwid / cos (grip_cutoff_angle)], center = true);

                translate([0, wall / cos (grip_cutoff_angle), 0])
                    rotate ([-grip_cutoff_angle, 0, 0])
                        translate([0, 0, 0.5 * maxwid / cos (grip_cutoff_angle)])
                            cube ([thickness + 2 * wall, 0.01, maxwid / cos (grip_cutoff_angle)], center = true);
            }

            hull ()
            {
                translate([0, -wall / cos (grip_cutoff_angle), 0])
                    rotate ([-grip_cutoff_angle, 0, 0])
                        translate([0, 0, 0.5 * maxwid / cos (grip_cutoff_angle)])
                            cube ([thickness, 0.01, (maxwidth + pad) / cos (grip_cutoff_angle)], center = true);

                translate([0, 2 * wall / cos (grip_cutoff_angle), 0])
                    rotate ([-grip_cutoff_angle, 0, 0])
                        translate([0, 0, 0.5 * maxwid / cos (grip_cutoff_angle)])
                            cube ([thickness, 0.01, (maxwidth + pad) / cos (grip_cutoff_angle)], center = true);
            }
        }
}

module blade (len = 200, maxwid = 25, tipwid = 5, thick = 2)
{
    translate ([-thick/2, 0, 0])
        union() {
            intersection() {
                    // first make a cube
                    cube([thick, len, maxwid]);

                    translate([0,len-maxwid,maxwid])
                        rotate([0,90,0])
                            cylinder(r=maxwid,h=thick*3,center=true);
            }

            cube([thick,len-maxwid,maxwid]);
        }
}

```


[User]
Hey, I'm looking for a parametric OpenSCAD design for a conical spool holder, similar to the one described in the attached file. It’s supposed to be simple, print without supports, and fit a standard 608zz bearing.

Here's what I'm thinking:

*   **Shape:** Basically, a truncated cone.
*   **Bearing:** It needs a recess at the wider end to hold a 22.1mm diameter bearing (a bit larger than a standard 22mm 608zz bearing, for easy fit). The recess should be slightly deeper than the bearing thickness, say an extra mm or so.
*   **Dimensions (parameters I'd like to be able to control):**
    *   `spool_height`: The height of the cone. Default to 25.4mm.
    *   `spool_thickness_narrow`: The diameter of the narrow end of the cone. Default to 44.45mm.
    *   `spool_thickness_wide`: The diameter of the wide end of the cone. Default to 69.85mm.
    *   `bearing_diameter`: The diameter of the bearing recess, default to 22.1mm.
    *   `smoothness`: The `$fn` value for smoother curves, default to 300.
*   **Orientation:** The cone should be oriented so that the wider end is at the "top" (i.e. when printed it will sit on the bed with its wide end facing upward).
*   **Logic:** The cone body should be generated and then a cylindrical hole should be cut for the bearing. The bearing recess must be on the larger diameter end. I'd also like it if the bottom of the recess was exactly at the "base" of the cone object - that is, it should not protrude out of the base.
*   **Dependencies:** I'm not planning on using any external libraries so just use standard OpenSCAD modules.

I'm aiming for the design to be print-in-place and easy to customize. I'd like all parameters to be easily accessible at the top of the file and well-commented. Also, the file should use the `difference()` primitive to subtract the bearing recess. Let me know if you need any other info.

[Assistant]
Conical_Spool_Holder_-_Notchless.scad:
```
// Heightof spool holder
Spool_Height = 25.4;

// Thickness of spool holder (minimum)
Spool_Thickness_Narrow = 44.45;

// Smoothness of resulting STL
Smoothness = 300;

// Diameter of bearing -- slightly bigger than actual (e.g. 22.01 mm for 22 mm bearing) makes it easier to fit
Bearing_Diameter = 22.1;

// Thickness of spool holder (maximum)
Spool_Thickness_Wide = 69.85;

translate([0, 0, Spool_Height])
rotate([180, 0, 0])
difference()
{
	//Main cone
	cylinder
	(
		d1 = Spool_Thickness_Narrow,
		d2 = Spool_Thickness_Wide,
		h = Spool_Height,
		$fn = Smoothness
	);

	// Recess for bearing
	translate([0, 0, (-1)])
		cylinder
		(
			d = Bearing_Diameter,
			h = Spool_Height + 2,
			$fn = Smoothness
		);
}
```


[User]
I want to design a parametric birdhouse that can be easily mounted on standard American U-channel sign posts. I've seen some cool designs using Chinese joinery that I'd like to incorporate – no nuts or bolts needed, just wedges that lock it in.

The birdhouse itself should be a rounded, egg-like shape mounted to a flat backplate that attaches to the U-channel post. The backplate will have holes that line up with the 1-inch spacing on the post. I'd like the design to be parametric, so I can change the height, width, depth, the size of the entrance hole, and the thickness of the birdhouse walls. It also needs a drainage hole in the bottom. I'd like the birdhouse to be printable without supports, and I'm thinking the Chinese joinery can be a bolt and wedge system. I’d like to use rounded edges whenever reasonable, but I don’t need to go overboard.

Here are the parameters I’m thinking about:

*   **U-Channel Width:** This should be a fixed value of 3.25 inches, which I'll use in creating the backplate.
*   **Height:** Total height of the birdhouse (not including the backplate). I want to control this in millimeters
*   **Width:** Width of the birdhouse in millimeters.
*   **Depth:** Depth of the birdhouse in millimeters.
*  **Entrance hole diameter:**  The diameter of the entrance hole in millimeters.
*   **Wall Thickness:** Thickness of the birdhouse walls in millimeters
*   **Drip Hole Diameter:** Diameter of the drainage hole in millimeters.
*   **Bolt Width:**  This will be based on the standard 3/8 inch diameter of the holes in the U-channel posts.
*   **Wedge Angle:** The angle of the wedges used in the Chinese joinery. I'm thinking about 10 degrees to start.

The backplate needs to be larger than the birdhouse to make sure the holes align with the post. The height will adjust so that the mounting holes will always be 1 inch apart (using the 25.4mm/inch convention). The distance between the two mounting holes on the backplate should be calculated automatically to fit on the post (it should always be an integer number of inches).

I'd like the code to also generate the bolt and wedge pieces needed for the Chinese joinery system. I think you will need to create a function that can handle rounding to a specified unit.

I think that's about it! I’m hoping you can help generate the complete OpenSCAD code (including the parameters) that I can use to build this. Please be sure to include comments to explain the different sections.

[Assistant]
Bird_House.scad:
```
//Bird House
//Ari M Diacou
//May 5, 2018

//Shared under Creative Commons License: Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0)
//see http://creativecommons.org/licenses/by-sa/3.0
////////////////////// Parameters ////////////////////////
//in inches
U_Channel_width=3.25;
//of the bird house in mm(not the back plate, which will be bigger by at least 1 inch)
height=113;
//of the bird house in mm, this can be bigger or smaller than the U-Channel width)
width=85;
//of the bird house in mm
depth=57;
//is the size of the hole in the bird house in mm
bird_width=25;
//in mm. More givess more insulation, but less space for chicks
birdouse_thickness=5;
//in mm, is provided to remove water
drip_hole_diameter=3;
//is loosely how curvy your bird house is, higher increases rendering time
$fn=12;
//This should be 9.525 (3/8") for american U-channel posts
bolt_width=9.525;
//The wedge is for the chinese joinery that this thing uses instead of nuts/bolts
wedge_angle=10;

/////////////////// Derived Parameters ///////////////////
hole=bird_width;
INCH=25.4+0;
backplate_width=U_Channel_width*INCH;
//This changes the height of the backplate so that the holes will line up with the ones on the post, which are placed every inch.
backplate_height=roundto(height+1.5*INCH+1.41*bolt_width,INCH);
backplate_hole_distance=backplate_height-1*INCH;
//epsilon, a small distance used for aligning parts
ep=0.05+0;
wedge_width=bolt_width/3;
//Could be shorter I guess
wedge_length=2*INCH;
//Might need tweaking
bolt_length=.6*backplate_width+birdouse_thickness+wedge_length*sin(wedge_angle);
bolt_seperation=max(backplate_width,width)/2+2*bolt_width;
//////////////////////// Main ////////////////////////////
translate([1.0*bolt_seperation,0,.5*.7071*bolt_width])
    rotate([0,-90,90])
        mybolt();
translate([1.5*bolt_seperation,0,.5*.7071*bolt_width])
    rotate([0,-90,90])
        mybolt();
translate([1.0*bolt_seperation,wedge_length+2*bolt_width,0])
    rotate([0,0,-90])
        wedge();
translate([1.5*bolt_seperation,wedge_length+2*bolt_width,0])
    rotate([0,0,-90])
        wedge();
difference(){
    union(){
        translate([0,(height-width)/2,0])
            back_plate();
        half_egg($fn=30);
        perch();
        }
    drip_hole();
    translate([0,0,birdouse_thickness+ep])
        cylinder(d=hole,h=depth);

    }
////////////////////// Functions /////////////////////////
module wedge(){
    //This function creates the wedges for the chinese joinery
    L=wedge_length;
    A=[0,0];
    B=[L*cos(wedge_angle),0];
    C=[L*cos(wedge_angle),L*sin(wedge_angle)];
    R=.333*.7071*bolt_width/2;

    linear_extrude(wedge_width)
    hull(){
        translate(A) circle(R);
        translate(B) circle(R);
        translate(C) circle(R);
        }
    }

module mybolt(){
    //Creates the squarish bolts for use in the chinese joinery. The .7071, and 1.41 factors running around are used so that the square bolts will fit inside of the circular bolt holes on the post.
    mod_bolt_width=.7071*bolt_width;

    translate([-.5,-1.5,-1.41+ep]*mod_bolt_width)
        cube([1,3,1/.7071]*mod_bolt_width);
    difference(){
        translate([-.5,-0.5,0]*mod_bolt_width)
            cube([1,1,0]*mod_bolt_width+[0,0,1]*bolt_length);
        translate([-.85*wedge_length,wedge_width/2,bolt_length-1.5*wedge_length*sin(wedge_angle)])
        rotate([90,0,0])
            wedge();
        }
    }

module back_plate(){
    //The back plate has it's height adjusted so that it is larger than the bird house so that the bolts will fit inside the post holes which are spaced every inch in the USA
    linear_extrude(birdouse_thickness){
        difference(){
            square([backplate_width,backplate_height],center=true);
            translate([0,+backplate_hole_distance/2]) square(.8*bolt_width,center=true);
            translate([0,-backplate_hole_distance/2]) square(.8*bolt_width,center=true);
            }
        }
    }
module perch(){
    //Sized and positioned based on the bird's width parameter above
    d1=.33*hole;
    d2=.4*d1;
    difference(){
    linear_extrude(depth+hole)
        hull(){
            translate([0,-hole/2-1.3*d1,0]) circle(d=d1);
            translate([0,-width/2+d2/2]) circle(d=d2);
            }
        translate([0,0,-ep]) egg();
        }
    }
module drip_hole(){
    //If water gets inside the bird house, it will drip through the bottom, keeping chicks warm and dry
    translate([0,-width/2+1.5*birdouse_thickness,birdouse_thickness])
    rotate([90,0,0])
        cylinder(d=drip_hole_diameter,h=2*birdouse_thickness);
    }
module test_thickness(){
    //used during testing to see the thickness of the bird house
    intersection(){
        hollow(width,thickness=5) egg();
        cube(width*[1,0.01,1],center=true);
        }
}
module half_egg(){
    //makes the half egg shape that gets mounted to the backplate, from the fuinction egg()
    hollow(width,thickness=birdouse_thickness){
    intersection(){
        cylinder(h=width+height,r=width+height) ;
        egg();
        }    }
    intersection(){
        cylinder(h=birdouse_thickness,r=width+height) ;
        egg();
        }
    }

module egg(){
    //The basic egg shape
    a=.6;
    d1=width;
    d2=a*width;
    h1=height-(d1+d2)/2;
    scale([1,1,2*depth/width])
    hull(){
        translate([0,h1,0]) sphere(d=d2);
        translate([]) sphere(d=d1,$fn=$fn/a);
        }
    }

module hollow(dimension=100, thickness=1){
    //Acts on a child function to hollow it out. "Dimension" is a dimesion of your child object, doesnt really matter which one. This fucntion then differences a scaled copy of the child object such that there is a hollow child object with a shell of "thickness".
    difference(){
        children(0);
        scale(1-(2*thickness)/dimension)
            children(0);
        }
    }

function roundto(input, precision)=
    round(pow(10,-log(precision))*input)*pow(10,log(precision));
    //Rounds "input" to the nearest "precision", works with non-integer powers of 10, like .333, or 20.
```


[User]
I'd like to create a 3D model of a tree using OpenSCAD, where the tree is generated using recursion. I'd like to be able to control several aspects of the tree.

Specifically, the tree should start with a base segment. The length and thickness of this initial segment should be adjustable with `len` and `thickness` parameters, respectively. The overall height of the 3D model should be controlled by a `height` parameter and should be generated using a `linear_extrude`.

Then, the tree should branch out recursively. The branching should be controlled by a `levels` parameter which would be how many levels of recursion the tree has. Each branch segment should be scaled based on the previous branch segment in terms of length and thickness - lets say to 0.6 to 0.8 of the previous length and 0.8 of the previous thickness. The angle of each branch should be varied using a random angle rotation around the z axis, somewhere between +20 and +35 degrees and -20 and -35 degrees. We can use a random number generator seeded with a parameter called `random_number` to keep it deterministic.

The overall color should be green, but it should get lighter as it goes up the tree and the color should change based on the level.

I'm not sure if it is necessary but you can also assume I'm using standard OpenSCAD libraries. I would prefer that the recursion be implemented through a module, and that the transformation matrices be used to achieve the branching of the tree. Please make sure this is in the generated code.

[Assistant]
module_recursion.scad:
```

//number of brenches
levels = 5;
// length of the first segment in mm
len = 50;
// thickness of the first segment
thickness = 5;
//heigh of thewhle tree
height = 5;
//a random number wich determines the position of the trees
random_number = 6;//[-100000,100000]
identity = [ [ 1, 0, 0, 0 ], [ 0, 1, 0, 0 ], [ 0, 0, 1, 0 ], [ 0, 0, 0, 1 ] ];

rcnt = 1000;
random = rands(0, 1, rcnt, random_number);
function rnd(s, e, r) = random[r % rcnt] * (e - s) + s;

// generate 4x4 translation matrix
function mt(x, y) = [ [ 1, 0, 0, x ], [ 0, 1, 0, y ], [ 0, 0, 1, 0 ], [ 0, 0, 0, 1 ] ];

// generate 4x4 rotation matrix around Z axis
function mr(a) = [ [ cos(a), -sin(a), 0, 0 ], [ sin(a), cos(a), 0, 0 ], [ 0, 0, 1, 0 ], [ 0, 0, 0, 1 ] ];

module tree(length, thickness, count, m = identity, r = 1) {
    color([0, 1 - (0.8 / levels * count), 0])
        multmatrix(m)
            square([thickness, length]);

    if (count > 0) {
        tree(rnd(0.6, 0.8, r) * length, 0.8 * thickness, count - 1, m * mt(0, length) * mr(rnd(20, 35, r + 1)), 8 * r);
        tree(rnd(0.6, 0.8, r + 1) * length, 0.8 * thickness, count - 1, m * mt(0, length) * mr(-rnd(20, 35, r + 3)), 8 * r + 4);
    }
}

linear_extrude(height = height){
    tree(len, thickness, levels);
}
```


[User]
Hi, I'm looking to create a parametric OpenSCAD model for a replacement clip used on DEC H960 equipment racks. I have an existing .scad file that describes the design, but I'd like to start fresh with a more flexible, parametric design using an established library. I’d like to make it easier to customize for different scenarios.

The existing design has the following features:

*   **Baseplate:** A flat base with rounded corners, 114.8mm long, 16.12mm wide, and 3.12mm thick. Corner radius is 1/16 inch.
*   **Riser Blocks:** Two blocks at each end, 23.8mm long, 9.52mm wide, and 5.08mm high. They sit on top of the baseplate.
*   **Posts:** Two posts with ball ends, each 2.39mm radius cylinder, 6.32mm tall, and a 3.18mm radius sphere on top.
*   **Hole Positions:**  The posts have specific x offsets (17.2 and 97.61 from the clip origin), with a common y offset of 4.94mm.
*   **Mounting Holes:** There are a few other holes on the baseplate for mounting:
    *   Two small holes of 1.72mm radius located at x offsets of 6.56 and 108.24mm, both with the same y offset as the posts.
    *   Two countersunk holes with a 2.78mm bottom radius and 4.9mm top radius, located at x offsets of 28.91 and 85.89mm and a y offset of 7mm. The countersink is 1mm deep.
    *   One large hole with a 5.5mm radius, centered on the width of the clip, and located at half the baseplate's length and 7.1mm on the Y axis
*   **Optional Features**
    *   The design should support a flexible post version, which uses concentric rings to allow some give. The original design uses wall thickness of 0.8mm, a bridge thickness of 1mm, with a 1mm gap between the rings. I'd like to parameterize the thicknesses and gaps. There are three ring cutouts in total.
    *   Optional extra mounting holes that are 1 Rack Unit (1.75 inches) away from the existing countersunk holes.
    *   Optional replacement of the posts with holes, for those who want to fit their own steel screws.  The screw hole diameters and depth should be parameterized as well. The original design used a 4mm diameter screw with a top chamfer.

Here's what I would like in the new design:

1.  **Parametric Design:** Make all the dimensions, positions, and radii easily adjustable through parameters. I want to be able to tweak the sizes for different rack systems.
2.  **Library Usage:** Use BOSL2 for the design. I like the way its functions are organized.
3.  **Flexible Post:** The flexible post design should be a configurable option with adjustable ring parameters. I should be able to choose a solid post or different types of flexible post options with varying ring parameters.
4.  **Mounting Holes:** The extra mounting holes should be another configurable option using BOSL2's built in 2-d and 3-d manipulation functions, should I want to add them.
5.  **Screw Posts:** The screw post option should also be configurable with adjustable screw diameter, depth, and countersink angles, should I want to add them.
6.  **Corner Rounding:** I'd like the baseplate corners to be rounded, with that radius configurable.
7.  **Clear Variable Names**: Please use clear and descriptive variable names for easy customization.
8.  **Well-Commented Code**: Please include comments to make it easier to understand each part of the design and use any modules from BOSL2 to further improve clarity and conciseness.
9.  **Single SCAD File:** Please output all the code into a single .scad file.

I think that covers everything, let me know if you have any questions.

[Assistant]
DEC_H960_rack_fascia_panel_clip.scad:
```
// DEC PDP-11 H960 rack fascia panel mounting clip
// Measured from an original DEC clip.
// The original appears to be made from a hard black plastic, it does not appear to be ABS though.
// The pins on the originals are quite fragile ...as you may already know!
// For the 5-1/4" fascia panel, one is required each side
// For the 10-1/2" fascia panel, two are required each side
//
// I suggest printing these from ABS. PETG or nylon would probably be good too.
//
// To generate, use the Customiser to generate original or flexible, with or without
// an extra set of mounting holes then press F5 to preview, F6 to render, save your STL.
//
// Measured and scripted by Steve Malikoff in Brisbane, Australia
// Last update 20180514

//////////////////////////////////////////////////////////////////////////////////////////////////
/////////// Customizer: Set 0 or 1 for the following then generate with F5 then F6 ///////////////
// Semi-flexible (1) or Original (0) posts
FLEXIBLE = 0; // [0:No, 1:Yes]
// Extra inter-Rack Unit spacing holes
EXTRA_HOLES = 0; // [0:No, 1:Yes]
// Replace post with hole only, for steel screw (ie.make your own post)
STEEL_SCREWS = 0; // [0:No, 1:Yes]
//////////////////////////////////////////////////////////////////////////////////////////////////

facets = 80;
$fn = facets;

INCH = 25.4;    // da da da Dah-di-Dah Dah-di-Dah (Imperial)

// The flat baseplate, overall dimensions
BASE_LENGTH = 114.8;
BASE_WIDTH = 16.12;
BASE_HEIGHT = 3.12;
CORNER_RADIUS = 1/16 * INCH;

// The riser block. There is one each end
BLOCK_LENGTH = 23.8;
BLOCK_WIDTH = 9.52;
BLOCK_HEIGHT=5.08;

// The two knobbly posts that hold the fascia panel
POST_RADIUS = 2.39;
POST_HEIGHT = 6.32;
BALL_RADIUS = 3.18;

// Fit your own steel screw (thanks to Lou N2M1Y - great idea!)
STEEL_SCREW_DIA = 4;    // 8-32 is 4.1mm, adjust to suit what you have

// Positions of the posts from 0,0:
FIRST_POST_CENTRE_OFFSET_X = 17.2;
SECOND_POST_CENTRE_OFFSET_X = 97.61;
BOTH_POSTS_CENTRE_OFFSET_Y = 4.94;

// The various holes in the thing
LARGE_HOLE_RADIUS = 5.5;
SMALL_HOLE_RADIUS = 1.72;
SCREW_HOLE_RADIUS = 2.78;
CSNK_RADIUS_TOP = 4.9;
CSNK_RADIUS_BOTTOM = 2.78;

// The offsets for these holes (the clip corner being on 0,0,0):
FIRST_SMALL_HOLE_CENTRE_OFFSET_X = 6.56;
SECOND_SMALL_HOLE_CENTRE_OFFSET_X = 108.24;
FIRST_CSNK_HOLE_CENTRE_OFFSET_X = 28.91;
SECOND_CSNK_HOLE_CENTRE_OFFSET_X = 85.89;
CSNK_HOLE_CENTRE_OFFSET_Y = 7;
CSNK_LOWER_HEIGHT = 1;

// These ring definitions are only used if you choose the flexible pin version (ie. ORIGINAL=0)
RING_WALL_THICKNESS = 0.8;  // for flexible ring variant
RING_BRIDGE_THICKNESS = 1;  // bridging the flex rings

//// Generate the desired model, original solid post version or semi-flexible post version
if (FLEXIBLE)
    ClipWithFlexiblePosts();
else
    ClipOriginalPattern();
//////////////// Uncomment out one of the above to generate, Hit F4 then F5 ///////////////

// Modelled directly from an original DEC H960 fascia panel clip
module ClipOriginalPattern()
{
    difference()
    {
        //Base();   // First attempt. Has plain od square corners
        BaseWithRoundedCorners();
        Holes();
        if (EXTRA_HOLES)
            HolesExtra();   // Allows additional inter-Rack Unit spacing
        if (STEEL_SCREWS)
            HolesForOwnPostScrews();
    }
}

// Same fascia panel clip with three cylindrical clearances around each pin
module ClipWithFlexiblePosts()
{
    difference()
    {
        //Base();   // First attempt. Has plain od square corners
        BaseWithRoundedCorners();
        Holes();
        if (EXTRA_HOLES)
            HolesExtra();   // Allows additional inter-Rack Unit spacing
        FlexRingCutoutNumber1();    // Innermost clearance, along post, from top, downwards
        FlexRingCutoutNumber2();    // Middle clearance, from bottom, upwards
        FlexRingCutoutNumber3();    // Outer clearance, from top, downwards
        //Slots();
    }
}

// Innermost ring clearance, from top, downwards, along post
module FlexRingCutoutNumber1()
{
    // One cylindrical channel around the first post
    translate([FIRST_POST_CENTRE_OFFSET_X, BOTH_POSTS_CENTRE_OFFSET_Y, RING_BRIDGE_THICKNESS])
        InnerRingCutout();
    // One cylindrical channel around the second post
    translate([SECOND_POST_CENTRE_OFFSET_X, BOTH_POSTS_CENTRE_OFFSET_Y, RING_BRIDGE_THICKNESS])
        InnerRingCutout();
}

module InnerRingCutout()
{
    difference()
    {
        cylinder(r=POST_RADIUS + RING_WALL_THICKNESS, h=10);
        cylinder(r=POST_RADIUS, h=10);
    }
}

// Middle ring clearance, from bottom, upwards
module FlexRingCutoutNumber2()
{
    // Second cylindrical channel around the first post
    translate([FIRST_POST_CENTRE_OFFSET_X, BOTH_POSTS_CENTRE_OFFSET_Y, -RING_BRIDGE_THICKNESS])
        MiddleRingCutout();
    // Second cylindrical channel around the second post
    translate([SECOND_POST_CENTRE_OFFSET_X, BOTH_POSTS_CENTRE_OFFSET_Y, -RING_BRIDGE_THICKNESS])
        MiddleRingCutout();
}

module MiddleRingCutout()
{
    ringInner = POST_RADIUS + (RING_WALL_THICKNESS * 2);
    ringOuter = POST_RADIUS + (RING_WALL_THICKNESS * 3);

    difference()
    {
        cylinder(r=ringOuter, h=BASE_HEIGHT + BLOCK_HEIGHT);
        cylinder(r=ringInner, h=BASE_HEIGHT + BLOCK_HEIGHT);
    }
}

// Outer ring clearance, from bottom, upwards
module FlexRingCutoutNumber3()
{
    // Third cylindrical channel around the first post
    translate([FIRST_POST_CENTRE_OFFSET_X, BOTH_POSTS_CENTRE_OFFSET_Y, RING_BRIDGE_THICKNESS])
        OuterRingCutout();
    // Third cylindrical channel around the second post
    translate([SECOND_POST_CENTRE_OFFSET_X, BOTH_POSTS_CENTRE_OFFSET_Y, RING_BRIDGE_THICKNESS])
        OuterRingCutout();
}

module OuterRingCutout()
{
    ringInner = POST_RADIUS + (RING_WALL_THICKNESS * 4);
    ringOuter = POST_RADIUS + (RING_WALL_THICKNESS * 5);

    difference()
    {
        cylinder(r=ringOuter, h=BASE_HEIGHT + BLOCK_HEIGHT);
        cylinder(r=ringInner, h=BASE_HEIGHT + BLOCK_HEIGHT);
    }
}

module Slots()
{
    translate([FIRST_POST_CENTRE_OFFSET_X + POST_RADIUS , 2, 0])
        cube([2,8,6]);
    translate([FIRST_POST_CENTRE_OFFSET_X - POST_RADIUS - 1, 2, 0])
        cube([2,8,6]);
}

// Square-cornered base and blocks
module Base()
{
    // main and both outer blocks
    cube([BASE_LENGTH, BASE_WIDTH, BASE_HEIGHT]);
    translate([0,0,BASE_HEIGHT])
        cube([BLOCK_LENGTH, BLOCK_WIDTH, BLOCK_HEIGHT]);
    translate([BASE_LENGTH - BLOCK_LENGTH,0,BASE_HEIGHT])
        cube([BLOCK_LENGTH, BLOCK_WIDTH, BLOCK_HEIGHT]);
    // generate the two posts
    Posts();
}

// Baseplate and both outer blocks with 1/16" rounded corners on outer ends as per original
module BaseWithRoundedCorners()
{
    // main and both outer blocks
    //cube([BASE_LENGTH, BASE_WIDTH, BASE_HEIGHT]);
    translate([CORNER_RADIUS, CORNER_RADIUS])
        linear_extrude(BASE_HEIGHT)
            minkowski()
            {
                square([BASE_LENGTH - CORNER_RADIUS*2, BASE_WIDTH-CORNER_RADIUS*2]);
                circle(r=CORNER_RADIUS);
            }
     // The two riser blocks, one at each end
    // Block closest to 0,0:
    translate([0,0,BASE_HEIGHT])
        linear_extrude(BLOCK_HEIGHT)
            hull()
            {
                translate([CORNER_RADIUS, 0])
                    square([BLOCK_LENGTH - CORNER_RADIUS, BLOCK_WIDTH]);
                translate([CORNER_RADIUS, CORNER_RADIUS])
                    circle(r=CORNER_RADIUS);
                translate([CORNER_RADIUS, BLOCK_WIDTH-CORNER_RADIUS])
                    circle(r=CORNER_RADIUS);
            }
    // Outer block:
    translate([BASE_LENGTH - BLOCK_LENGTH,0,BASE_HEIGHT])
        linear_extrude(BLOCK_HEIGHT)
            hull()
            {
                //translate([CORNER_RADIUS, 0])
                    square([BLOCK_LENGTH - CORNER_RADIUS, BLOCK_WIDTH]);
                translate([BLOCK_LENGTH - CORNER_RADIUS, CORNER_RADIUS])
                    circle(r=CORNER_RADIUS);
                translate([BLOCK_LENGTH - CORNER_RADIUS, BLOCK_WIDTH-CORNER_RADIUS])
                    circle(r=CORNER_RADIUS);
            }
    // generate the two posts
    if (!STEEL_SCREWS)
        Posts();
}

// Posiiton both posts
module Posts()
{
    translate([FIRST_POST_CENTRE_OFFSET_X, BOTH_POSTS_CENTRE_OFFSET_Y, BASE_HEIGHT + BLOCK_HEIGHT])
        Post();
    translate([SECOND_POST_CENTRE_OFFSET_X, BOTH_POSTS_CENTRE_OFFSET_Y, BASE_HEIGHT + BLOCK_HEIGHT])
        Post();
}

// A single post with sphere
module Post()
{
    cylinder(r=POST_RADIUS, h=POST_HEIGHT);
    translate([0,0,POST_HEIGHT])
        sphere(r=BALL_RADIUS);
}

// Position the two countersunk screw holes and the large centre hole
module Holes()
{
    // large centre hole
    translate([BASE_LENGTH/2, 7.1, 0])
        LargeHole();
    // First outer hole
    translate([FIRST_SMALL_HOLE_CENTRE_OFFSET_X, BOTH_POSTS_CENTRE_OFFSET_Y, 0])
        SmallHole();
    // Second outer hole
    translate([SECOND_SMALL_HOLE_CENTRE_OFFSET_X, BOTH_POSTS_CENTRE_OFFSET_Y, 0])
        SmallHole();
    // First countersunk hole
    translate([FIRST_CSNK_HOLE_CENTRE_OFFSET_X, CSNK_HOLE_CENTRE_OFFSET_Y, 0])
        CountersunkHole();
    // Second countersunk hole
    translate([SECOND_CSNK_HOLE_CENTRE_OFFSET_X, CSNK_HOLE_CENTRE_OFFSET_Y, 0])
        CountersunkHole();
}

//
module HolesForOwnPostScrews()
{
    translate([FIRST_POST_CENTRE_OFFSET_X, BOTH_POSTS_CENTRE_OFFSET_Y, 0])
    {
        cylinder(d=STEEL_SCREW_DIA, h=BASE_HEIGHT + BLOCK_HEIGHT);
        cylinder(d1=STEEL_SCREW_DIA * 2, d2=STEEL_SCREW_DIA, h=STEEL_SCREW_DIA / 2);
    }
    translate([SECOND_POST_CENTRE_OFFSET_X, BOTH_POSTS_CENTRE_OFFSET_Y, 0])
    {
        cylinder(d=STEEL_SCREW_DIA, h=BASE_HEIGHT + BLOCK_HEIGHT);
        cylinder(d1=STEEL_SCREW_DIA * 2, d2=STEEL_SCREW_DIA, h=STEEL_SCREW_DIA / 2);
    }
}

// Not sure what DEC intended this large hole for, when mounted on the H960
module LargeHole()
{
        cylinder(r=LARGE_HOLE_RADIUS, h=BASE_HEIGHT);
}

// An outer hole
module SmallHole()
{
        cylinder(r=SMALL_HOLE_RADIUS, h=BASE_HEIGHT + BLOCK_HEIGHT);
}

// The countersunck screw fixing hole
module CountersunkHole()
{
        cylinder(r=SCREW_HOLE_RADIUS, h=BASE_HEIGHT);
        translate([0, 0, CSNK_LOWER_HEIGHT])
            cylinder(r2=CSNK_RADIUS_TOP, r1= CSNK_RADIUS_BOTTOM, h=BASE_HEIGHT - CSNK_LOWER_HEIGHT);
}

// Put two extra countersunk holes in, to allow inter-rack unit adjustment
module HolesExtra()
{
    OneRackUnit = 1.75 * INCH;
    // Additional countersunk hole, position outwards from first csnk
    translate([FIRST_CSNK_HOLE_CENTRE_OFFSET_X + OneRackUnit, CSNK_HOLE_CENTRE_OFFSET_Y, 0])
        CountersunkHole();
    // Another additional countersunk hole, position inwards from first csnk
    translate([SECOND_CSNK_HOLE_CENTRE_OFFSET_X - OneRackUnit, CSNK_HOLE_CENTRE_OFFSET_Y, 0])
        CountersunkHole();
}

```


[User]
I want to generate a 3D model in OpenSCAD that can be either an octahedron or a pyramid shape, controlled by a variable. The base size should also be adjustable.

Here's the breakdown:

**Core Shape Selection:**

*   The model should have a variable called `shape` which can be set to either "octahedron" or "pyramid".
*   If "octahedron" is selected, the full octahedron should be generated.
*   If "pyramid" is selected, I only want the top half, essentially a pyramid shape. This needs to be done by creating a difference between the octahedron and a large cube that cuts off the bottom part.

**Parameters:**

*   `size`:  This variable should control the base size of the octahedron or pyramid.
*   `x`: This parameter controls how many iterations of subdivision that the octahedron goes through. A higher number will result in a denser, more complex structure; a low number will give a simpler object. I'm looking for this to be a relatively simple recursive function.
*   `thicken`: There should be a slight thickening applied to the octahedron's faces before subdivision to make it more solid. The amount of this thickening should be adjustable with the `thicken` variable.
*   `fdepth`: the final recursion depth, a variable which should also be editable.

**Octahedron Generation:**

*   The octahedron should be generated recursively via a module.
*   The `size` variable should be used to calculate an internal size variable,  `size0 = size / sqrt(2);`.
*   The recursive function will receive a `depth` to track how far it is in the recursion, a position vector, and a size.
*   The recursion should stop when depth reaches `fdepth`.
*   When depth is equal to `fdepth`, it should use the polyhedron command to build that octahedron with the given `size` value and `thicken`, instead of recursing. It should use the given points and faces.
*   Otherwise, it should subdivide by calling the recursive module again on the vertices of the octahedron at the current size.

**Cutout for Pyramid:**

*   If the `shape` is set to "pyramid", you'll need to create a large cube that goes below the octahedron. This cube should be large enough to fully cut off the bottom half of the octahedron when a `difference()` operation is performed. This should be a function called `cutout_cube()`.

Please provide the OpenSCAD code that achieves this parametric design.

[Assistant]
octa.scad:
```
// shape of the model
shape = "pyramid";//[octahedron,pyramid]
//base size
size = 50;
//number of cutouts ( smaller number = more cutouts)
x = 0;
// thicken up the octahedron a little bit
thicken = .20;

// octahedron size
fdepth = 3;

size0 = size / sqrt(2);

module octa(depth, vec, sz) {
    cx = vec[0];
    cy = vec[1];
    cz = vec[2];
    if (depth == fdepth) {
        szc = sz + thicken;
        polyhedron(points = [
            [cx      , cy      , cz + szc],
            [cx + szc, cy      , cz      ],
            [cx      , cy + szc, cz      ],
            [cx - szc, cy      , cz      ],
            [cx      , cy - szc, cz      ],
            [cx      , cy      , cz - szc]],
           faces = [[0, 1, 2], [0, 2, 3], [0, 3, 4], [0, 4, 1],
                    [5, 4, 3], [5, 3, 2], [5, 2, 1], [5, 1, 4]],
            convexity = 2);
    } else {
       octa(depth + 1, [cx         , cy         , cz + sz / 2], sz / 2);
       octa(depth + 1, [cx + sz / 2, cy         , cz         ], sz / 2);
       octa(depth + 1, [cx         , cy + sz / 2, cz         ], sz / 2);
       octa(depth + 1, [cx - sz / 2, cy         , cz         ], sz / 2);
       octa(depth + 1, [cx         , cy - sz / 2, cz         ], sz / 2);
       octa(depth + 1, [cx         , cy         , cz - sz / 2], sz / 2);
    }
}
module cutout_cube(){
    translate([0, 0, -5000]){
    cube([10000, 10000, 10000], center=true);
}
}
if (shape == "pyramid"){
    echo("pyramid");
    difference(){
    octa(x, [0, 0, 0], size0);

    cutout_cube();
    }
}
else{
    octa(x, [0, 0, 0], size0);
}
// https://www.thingiverse.com/thing:1123004
```


[User]
Hi, I'm looking to create a custom follow focus gear for my camera lenses. I have an existing SCAD file that does most of what I need, but it's a bit clunky, and I'd like something more robust and easier to use. The core function is to generate a gear with specific parameters, particularly the number of teeth, bore diameter, and overall thickness. It should also have a bevel on the teeth to remove sharp edges.

Here's what I need it to do:

1.  **Parametric Gear Generation:**
    *   The gear needs to be fully parametric, allowing me to adjust the number of teeth, the bore diameter (the hole in the center), and the gear's overall thickness.
    *   It must use a module number of 0.8 since that's standard for camera lens follow focus systems, so that should be fixed, but the other gear parameters should be configurable.
    *  It should be possible to adjust rim thickness and width, hub thickness and diameter, and have optional circles cut into the gear, specifying number of them, their size and location.
   *   I need to be able to adjust the involute curve calculation quality to balance performance and detail.

2.  **Beveled Teeth:**
    *   The gear teeth should have a small bevel to remove sharp edges and make it easier to mesh with other gears. The amount of the bevel should also be controllable.

3.  **Seamless 360º Design:**
    *   The gear must be a seamless, 360º ring.

4. **Modularity:**
   * I'd like the gear generation to be contained within a `gear` module which I can call with all parameters to generate my follow focus gear. This way, I can adapt it for other applications in the future if I need to.

5.  **Error Checking:**
    *   There should be some basic error checking to ensure that the necessary pitch definition is provided.

I'm not really attached to any particular libraries, but I want the final design to be accurate and robust. So, anything you'd recommend is fine with me.

Could you please generate the necessary OpenSCAD file(s) for me? Thanks!

[Assistant]
lens-gear_simple_customiser.scad:
```
// Parametric Cinema/Film Lens Gears by Jaymis - http://jaymis.com
// Create precisely-sized, 360º seamless follow focus gears for film and still lenses.
// Including a perky little bevel on gear teeth to remove sharp edges.
//
// Based on "Parametric Involute Bevel and Spur Gears by GregFrost"
// http://www.thingiverse.com/thing:3575
//
// Thanks to sveltema for help making this work with Customiser
// http://www.thingiverse.com/thing:1060283#comment-726112
// http://www.thingiverse.com/sveltema

// Change this number to vary the overall gear diameter
NUMBER_OF_TEETH = 95; // [10:1:260]
// Hole diameter. Change by 0.5mm increments and test
BORE_DIAMETER = 70.0;  // [3:.1:200]
// Thickness of the gear
GEAR_THICKNESS = 10;   // [1:1:60]

// Simple Camera Lens Gear:

module gear (
	NUMBER_OF_TEETH=15,
	circular_pitch=false, diametral_pitch=false, module_number = false,	//diametrial pitch is US, Pc is used by tool
	pressure_angle=20,
	clearance = 0.2,
	GEAR_THICKNESS=5,
	rim_thickness=8,
	rim_width=5,
	hub_thickness=10,
	hub_diameter=15,
	BORE_DIAMETER=5,
	circles=0,
	backlash=0,
	twist=0,
	involute_facets=0,
	no_bore = false
	)
{
	if (circular_pitch==false && diametral_pitch==false && module_number==false)
		echo("MCAD ERROR: gear module needs either a diametral_pitch or circular_pitch");

	//convert module to diametrial pitch because I don't know how to logic
	diametral_pitch = (diametral_pitch!=false?diametral_pitch:1/module_number);

	//Convert diametrial pitch to our native circular pitch
	circular_pitch = (circular_pitch!=false?circular_pitch:180/diametral_pitch);

	// Pitch diameter: Diameter of pitch circle.
	pitch_diameter  =  NUMBER_OF_TEETH * circular_pitch / 180;
	pitch_radius = pitch_diameter/2;
	echo ("Teeth:", NUMBER_OF_TEETH, " Pitch radius:", pitch_radius);

	// Base Circle
	base_radius = pitch_radius*cos(pressure_angle);

	// Diametrial pitch: Number of teeth per unit length.
	pitch_diametrial = NUMBER_OF_TEETH / pitch_diameter;

	// Addendum: Radial distance from pitch circle to outside circle.
	addendum = 1/pitch_diametrial;

	//Outer Circle
	outer_radius = pitch_radius+addendum;

	// Dedendum: Radial distance from pitch circle to root diameter
	dedendum = addendum + clearance;

	// Root diameter: Diameter of bottom of tooth spaces.
	root_radius = pitch_radius-dedendum;
	backlash_angle = backlash / pitch_radius * 180 / pi;
	half_thick_angle = (360 / NUMBER_OF_TEETH - backlash_angle) / 4;

	// Variables controlling the rim.
	rim_radius = root_radius - rim_width;

	// Variables controlling the circular holes in the gear.
	circle_orbit_diameter=hub_diameter/2+rim_radius;
	circle_orbit_curcumference=pi*circle_orbit_diameter;

	// Limit the circle size to 90% of the gear face.
	circle_diameter=
		min (
			0.70*circle_orbit_curcumference/circles,
			(rim_radius-hub_diameter/2)*0.9);

difference () // Difference off hollow cone shapes to remove sharp edges of gears
    {

	difference () // Original gear code
	{
		union ()
		{
			difference ()
			{
				linear_extrude (height=rim_thickness, convexity=10, twist=twist)
				gear_shape (
					NUMBER_OF_TEETH,
					pitch_radius = pitch_radius,
					root_radius = root_radius,
					base_radius = base_radius,
					outer_radius = outer_radius,
					half_thick_angle = half_thick_angle,
					involute_facets=involute_facets);

				if (GEAR_THICKNESS < rim_thickness)
					translate ([0,0,GEAR_THICKNESS])
					cylinder (r=rim_radius,h=rim_thickness-GEAR_THICKNESS+1);

			}
			if (GEAR_THICKNESS > rim_thickness)
				cylinder (r=rim_radius,h=GEAR_THICKNESS);
			if (hub_thickness > GEAR_THICKNESS)
				translate ([0,0,GEAR_THICKNESS])
				cylinder (r=hub_diameter/2,h=hub_thickness-GEAR_THICKNESS);
		}
		if (!no_bore) {
			translate ([0,0,-1])
			cylinder (
				r=BORE_DIAMETER/2,
				h=2+max(rim_thickness,hub_thickness,GEAR_THICKNESS));
		}
		if (circles>0)
		{
			for(i=[0:circles-1])
				rotate([0,0,i*360/circles])
				translate([circle_orbit_diameter/2,0,-1])
				cylinder(r=circle_diameter/2,h=max(GEAR_THICKNESS,rim_thickness)+3);
		}

	}

union () // Union two separate copies of the same tooth bevelling shape because I don't know how to mirror/copy in OpenSCAD
    {

    difference() // Create a hollow cone shape for bevelling gear teeth
    {
    translate([0,0,rim_thickness-addendum*2])
    cylinder(h = outer_radius, r1 = outer_radius+GEAR_THICKNESS, r2 = outer_radius, center = rim_width); // make a cylinder for bevelling gears
    translate([0,0,rim_thickness-addendum*2-clearance])
    cylinder(h = outer_radius, r1 = outer_radius+addendum, r2 = 0, center = outer_radius); // make a cone for bevelling gears
    }

mirror( [0,0,1] )
{
    difference() // Create an inverted hollow cone shape for bevelling gear teeth
    {
    translate([0,0,-addendum*2])
    cylinder(h = outer_radius, r1 = outer_radius+GEAR_THICKNESS, r2 = outer_radius, center = rim_width); // make a cylinder for bevelling gears
    translate([0,0,-addendum*2-clearance])
    cylinder(h = outer_radius, r1 = outer_radius+addendum, r2 = 0, center = outer_radius); // make a cone for bevelling gears
    }
}

} // end union join top and bottom bevel shapes

}

}

module gear_shape (
	NUMBER_OF_TEETH,
	pitch_radius,
	root_radius,
	base_radius,
	outer_radius,
	half_thick_angle,
	involute_facets)
{
	union()
	{
		rotate (half_thick_angle) circle ($fn=NUMBER_OF_TEETH*2, r=root_radius);

		for (i = [1:NUMBER_OF_TEETH])
		{
			rotate ([0,0,i*360/NUMBER_OF_TEETH])
			{
				involute_gear_tooth (
					pitch_radius = pitch_radius,
					root_radius = root_radius,
					base_radius = base_radius,
					outer_radius = outer_radius,
					half_thick_angle = half_thick_angle,
					involute_facets=involute_facets);
			}
		}
	}
}

module involute_gear_tooth (
	pitch_radius,
	root_radius,
	base_radius,
	outer_radius,
	half_thick_angle,
	involute_facets)
{
	min_radius = max (base_radius,root_radius);

	pitch_point = involute (base_radius, involute_intersect_angle (base_radius, pitch_radius));
	pitch_angle = atan2 (pitch_point[1], pitch_point[0]);
	centre_angle = pitch_angle + half_thick_angle;

	start_angle = involute_intersect_angle (base_radius, min_radius);
	stop_angle = involute_intersect_angle (base_radius, outer_radius);

	res=(involute_facets!=0)?involute_facets:($fn==0)?5:$fn/4;

	union ()
	{
		for (i=[1:res])
		assign (
			point1=involute (base_radius,start_angle+(stop_angle - start_angle)*(i-1)/res),
			point2=involute (base_radius,start_angle+(stop_angle - start_angle)*i/res))
		{
			assign (
				side1_point1=rotate_point (centre_angle, point1),
				side1_point2=rotate_point (centre_angle, point2),
				side2_point1=mirror_point (rotate_point (centre_angle, point1)),
				side2_point2=mirror_point (rotate_point (centre_angle, point2)))
			{
				polygon (
					points=[[0,0],side1_point1,side1_point2,side2_point2,side2_point1],
					paths=[[0,1,2,3,4,0]]);
			}
		}
	}
}

/* [Hidden] */
$fs = 0.5; // Changed minimum size of circle fragment. Default 2.
$fa = 2; // Changed minimum angle for circle fragment, gives smoother circle. Default 12.

pi=3.1415926535897932384626433832795;

gear (module_number=0.8, // Camera lens gears are Mod 0.8. Don't change this number unless you have a non-standard follow focus system.

	NUMBER_OF_TEETH = NUMBER_OF_TEETH,
    BORE_DIAMETER = BORE_DIAMETER, // Hole diameter. Change by 0.5mm increments and test

	rim_thickness = GEAR_THICKNESS, // Thickness of the part with the gear teeth
    GEAR_THICKNESS = GEAR_THICKNESS // Thickness of the part which grips the lens barrel
    );

// Mathematical Functions
//===============

	// Finds the angle of the involute about the base radius at the given distance (radius) from it's center.
	//source: http://www.mathhelpforum.com/math-help/geometry/136011-circle-involute-solving-y-any-given-x.html

	function involute_intersect_angle (base_radius, radius) = sqrt (pow (radius/base_radius, 2) - 1) * 180 / pi;

	// Calculate the involute position for a given base radius and involute angle.

	function rotated_involute (rotate, base_radius, involute_angle) =
	[
		cos (rotate) * involute (base_radius, involute_angle)[0] + sin (rotate) * involute (base_radius, involute_angle)[1],
		cos (rotate) * involute (base_radius, involute_angle)[1] - sin (rotate) * involute (base_radius, involute_angle)[0]
	];

	function mirror_point (coord) =
	[
		coord[0],
		-coord[1]
	];

	function rotate_point (rotate, coord) =
	[
		cos (rotate) * coord[0] + sin (rotate) * coord[1],
		cos (rotate) * coord[1] - sin (rotate) * coord[0]
	];

	function involute (base_radius, involute_angle) =
	[
		base_radius*(cos (involute_angle) + involute_angle*pi/180*sin (involute_angle)),
		base_radius*(sin (involute_angle) - involute_angle*pi/180*cos (involute_angle)),
	];

```


[User]
Hey, I'm looking to design a cat toy track that uses ping pong balls. I've seen a few designs around but want something parametric so I can easily adjust things for different sized beds, and maybe change the number of slots where the cat can reach in.

Essentially, the track is a circular ring with a channel inside for the ball to roll around, and then slots on top where the cat can reach the ball. I need to make sure that the slots are sized so a ping pong ball can't actually be pulled *out*, of course.

Specifically, I’d like to be able to control:

*   **print bed width:** the overall diameter of the track needs to fit within the print bed, so I'd like that to be a parameter. I’m using a printer with a bed that's 300mm across, but it would be cool if that was an adjustable parameter.
*   **number of slots:** I want to easily change how many slots there are for the cat to reach in. I think 4 might be a good start, but maybe I want more.
*   **wall thickness:** How thick the walls of the track and tube are
*   **ball radius:** Standard ping pong balls are around 20mm in radius, but I'd like to be able to change this to accommodate different sized balls.
*   **foot height:** The height of the base that supports the track.
*   **tube radius:** The radius of the inner and outer parts of the circular tube track needs to be able to adjust to accommodate the ball size parameter. It should also take wall thickness into account.
*   **track radius:** The radius of the entire track. This also needs to be calculated relative to the size of the print bed.
*   **width of foot:** The width of the support foot.
*   **radius of paw slots:** These need to be smaller than the diameter of the ball, and also related to the ball size.
*  **slot arc:** I need a way to control the angle that the reach-in slots are covering. This is related to the number of slots, but I want to be able to modify it.
* **resolution:** I want the circular elements to be nice and round, and have a high polygon count.

So I was thinking, the design would have a circular "outer tube" with a support foot, and then a subtracted "inner tube" to form the track, then the holes to let the cat reach in. I also need an insertion hole for adding a ball, which I guess is a simple cylinder subtracted from the top somewhere.

Could you generate the OpenSCAD code for this? I don’t think any special libraries are needed, just vanilla OpenSCAD. I'm looking for at least one .scad file, or more if that makes sense for modularity.

[Assistant]
Cat_Track.scad:
```
/*
Code by Patrick Gaston, 5/2018. Use at your own risk. I make no guarantee that the object generated by this code is safe for printers, humans or other animals.
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation.
*/

width_print_bed = 300;
count_slots = 4;
thickness_wall = 2.4;
radius_ball = 20; //Standard ping pong ball radius = 20mm.
height_foot = 3;
resolution = 64;

radius_tube_inner = radius_ball + 4;
radius_tube_outer = radius_tube_inner + thickness_wall;
radius_track = (width_print_bed / 2) - 10 - radius_tube_outer;
width_foot = 2 * radius_tube_outer/3;
radius_paw_slot = radius_ball - 2; //Should be smaller than diameter of ball, so ball doesn't come out.
arc_slot = 360 / (2*count_slots); //Degrees of arc over which slot extends;
angle_start_slot = arc_slot / 2; //1st slot starts here;

difference()
    {
    Outer_Tube();
    Inner_Tube();
    Ball_Insertion_Hole();
    Multi_Slot();
    }

module Single_Slot()
    {
    color("Chartreuse")
        {
        translate([0,0,radius_tube_outer + radius_paw_slot])
        rotate_extrude($fn = resolution, angle = arc_slot, convexity = 2)
        translate([radius_track + (radius_tube_outer/2),0,0])
        circle($fn = resolution, r = radius_paw_slot);

        translate([radius_track + (radius_tube_outer/2),0,radius_tube_outer + radius_paw_slot])
        sphere($fn = resolution, r = radius_paw_slot);

        rotate([0,0,arc_slot])
        translate([radius_track + (radius_tube_outer/2),0,radius_tube_outer + radius_paw_slot])
        sphere($fn = resolution, r = radius_paw_slot);
        }
    }
module Multi_Slot()
    {
     for (i = [1 : 1 : count_slots])
         {
         rotate([0,0,angle_start_slot + (2*i*arc_slot)])
         Single_Slot();
         }
    }
module Foot()
    {
    color("Fuchsia")
    linear_extrude(height = height_foot, convexity = 10)
    difference()
        {
        circle($fn = resolution, r = radius_track + (width_foot/2));
        circle($fn = resolution, r = radius_track - (width_foot/2));
        }
    }
module Outer_Tube()
    {
    color("SkyBlue")
        {
        Foot();
        translate([0,0,radius_tube_outer])
        rotate_extrude($fn = resolution, angle = 360, convexity = 2)
        translate([radius_track,0,0])
        circle($fn = resolution, r = radius_tube_outer);
        }
    }
module Inner_Tube()
    {
    color("SkyBlue")
    translate([0,0,radius_tube_outer])
    rotate_extrude($fn = resolution, angle = 360, convexity = 2)
    translate([radius_track,0,0])
    circle($fn = resolution, r = radius_tube_inner);
    }
module Ball_Insertion_Hole()
    {
    translate([radius_track,0,radius_tube_outer])
    cylinder($fn = resolution, h = radius_tube_outer + 1, r = radius_ball + 2);
    }
```