[User]
Okay, I'd like to create a customizable sheriff's star badge using OpenSCAD. I've seen some examples, and I'd like to be able to tweak a few things.

Specifically, I need a 5-pointed star with a flat back, not just a star extruded in 2D. I need to be able to adjust:

*   **The overall radius of the star:** I need a parameter for the distance from the center to the tip of the star.
*   **The thickness of the backing:**  I want to control how thick the flat base of the badge is.
*   **Text size:** I need to emboss some text onto the front, and I need a parameter to control how large that text is.
*   **Text embossing height:** I want to control how high the embossed text sticks up from the surface of the badge.
*   **The text itself:** I need to be able to specify what text is embossed onto the badge.  I'm thinking this would be a single line, maybe with a 64 character limit to avoid getting too crazy.
*   **A pin slot:**  I need a horizontal slot cut out of the back of the badge, sized for a standard pin or clasp.

The star should have five distinct points, kind of like a classic sheriff's star. The flat base should be solid, and the text should be centered on top of the star. The slot should be on the back, horizontally oriented, and roughly centered.

I have noticed a library called `Write.scad` that seems to be used for text embossing, and I like that feature!

Could you generate an OpenSCAD file with these parameters exposed so I can easily adjust them in the customizer? Thanks!

[Assistant]
sheriff_star_v2.scad:
```
use<write/Write.scad>

//radius of star
radius=32; //[25:52]
//thickness of backing
thickness=4;
//text size
textSize=8;//[5:11]
//text embossing height (raised above backing)
textHeight=1;//[.3:Small,1:Normal,2.5:High]
//Text to center on badge - 64 character limit!
labelText="Sheriff";

//draw triangle, add points
module drawTriangle(rad,thick) {
  //radius of star without rounded points - ignore this
  rad=rad/1.15;
  union() {
    cylinder(r=rad,thick,center=true, $fn=3);
    translate([rad,0,0])cylinder(r=rad*.15, thick, center=true, $fn=24);
    translate([-rad*sin(30),rad*cos(30),0])cylinder(r=rad*.15,thick,center=true, $fn=24);
    translate([-rad*sin(30),-rad*cos(30),0])cylinder(r=rad*.15,thick,center=true, $fn=24);
  }
}

module drawStar(rad,thick){
  //tip length - ignore this!
  tlen=((2*(rad*(cos(30))))/3)/2;
  //draw the two halves of the star, make a cutout for a pin
  difference(){
    union() {
        drawTriangle(rad,thick);
        rotate([0,0,180]) drawTriangle(rad,thick);
    }
    translate([0,tlen,-2*thick+2.5])cube([tlen*2,2.5,thick*3],center=true);
  }
}

//join the text to the star
union(){
  color("blue")rotate([0,0,0])translate([0,0,thickness/2])drawStar(radius,thickness);
  color("red")translate([0,0,.5*textHeight+thickness])write(labelText,t=textHeight+1,h=textSize,center=true);
//  color("red")translate([0,(-textSize/2)-textSize*.6,thickness-1])label(labelText, size=textSize, height=textHeight+1);
}

```


[User]
Okay, I'm looking to design a spring seat for my 3D printer projects, and I'd like the design to be a bit more robust and flexible than what I've seen online. I want to be able to easily adjust the size of the seat and the hole for the bolt.

Here's what I'm thinking:

I need a spring seat that can be either an "inside" or "outside" type, like the one described in the example I have (I can show you that if needed, but it's pretty basic). The "inside" type has the support for the spring *inside* the base cylinder, making it more compact, while the "outside" type has the support on the outside, creating a larger overall footprint but hiding the base of the spring.

Here's the core functionality I need, parametrically defined:

*   **`seat_type`**: A string variable to define whether the seat is "inside" or "outside". Default to "inside".
*   **`bolt_hole_radius`**: The radius of the center hole for a bolt.
*   **`seat_radius`**: The radius of the base circle that the spring will sit on.
*   **`support_height`**: The height of the supporting wall for the spring, not including the base thickness.
*   **`thickness`**: The thickness of the base of the seat.
*   **`resolution`**:  The resolution (number of segments) for the cylinders.
*   **`base_diameter`**:  The diameter of the flat base, for when the support is of type outside.
*   **`spring_guide_thickness`**: The thickness of the wall that guides the spring itself (this would always be on the inside). I think it would be an additional parameter, so not a calculated value, with a different default than `thickness`.
*   **`spring_guide_diameter`**: The inside diameter of the spring support cylinder (to fit a spring), different from the radius of the base. This will vary depending on the outside diameter of the springs I'm using.
*   **`chamfer_angle`**: The angle of the chamfer on the top edge, will be used if chamfer is enabled.
*  **`chamfer_enabled`**: A Boolean that enables a chamfer on the top outer edge. Defaults to false.
*   **`corner_radius`**: The radius applied to the top inside corner of the spring guide (where the base meets the guide).
*   **`corner_fillet_enabled`**: A Boolean to turn on or off rounding of the inner corner between the guide and the base. Defaults to true.

I'd also like to add these features:

*   **Chamfer**: A chamfered top edge on the outer rim of the spring seat to improve print quality and visual appeal. This should be optional, with a parameter to control the angle.
*   **Fillet**: A small fillet radius at the inside corner where the support wall meets the base, to reduce stress concentrations and also to improve print quality (less overhanging corners). This should be optional.

I'd like to use these parameters to create a parametric OpenSCAD file. Could you generate the code? I think I'll only need the basic OpenSCAD language, no need for any libraries.

[Assistant]
spring_seat.scad:
```
/***************************************************************************
Spring seat to maintain spring alignment and even pressure when compressed.
Author: Mike Thompson (thingyverse: mike_linus)
Date Last Modified: 16/03/2013
Description: change the variable values to print an inside or outside seat of the required dimensions.  The inside seat is more compact for tighter spaces.  The outside version hides the base of the spring for but looks chunkier.
****************************************************************************/

/*globals*/
resolution=50;
bolt_hole_radius=2.5;
seat_radius=5;
support_height=3;
//"inside" or "outside"
seat_type="inside";
thickness=1;

$fn=resolution;

module base(){
	cylinder(r=seat_radius,h=thickness);
	cylinder(r=seat_radius-thickness-0.25,h=support_height);
}

if (seat_type=="inside"){
	difference(){
		base();
		cylinder(r=bolt_hole_radius,h=support_height);
	}
}
else {
	difference(){
		cylinder(r=seat_radius+thickness,h=support_height);
		translate([0,0,thickness])cylinder(r=seat_radius,h=support_height);
		cylinder(r=bolt_hole_radius,h=support_height);
	}
}

```


[User]
Okay, I'm trying to design an SD card holder that can be attached to a keychain, and I'm pretty new to OpenSCAD, so I need some help.

Here's what I want:

**General Concept:** I need a rectangular case that holds SD cards, with a hinge to allow it to open and close, and a loop to attach it to a keychain. It should print flat, and then be folded up.

**Card Dimensions:** I'll need to be able to specify the width, height, and depth of the SD cards that the case is designed to hold. Also, I need to be able to specify the number of cards the case should hold, so that the overall depth of the case can be adjusted.

**Case Dimensions:** The edges of the case should have a specified thickness. The hinge should also have its own thickness, as well as a gap to help the bending process. I also need to specify the radius of the keychain loop hole, and the outer radius of the keychain loop itself, and the placement of the hole.

**Parameters:** I'd like these to be configurable:

*   `number_of_cards`: The number of SD cards the case should hold (e.g., 1, 2, 3).
*   `card_width`: The width of the SD card (mm).
*   `card_height`: The height of the SD card (mm).
*   `card_depth`: The depth of the SD card (mm).
*   `edge_thickness`: The thickness of the edges of the case (mm).
*   `hinge_thickness`: The thickness of the hinge (mm).
*   `hinge_bend_gap`: The size of the gap to facilitate bending for the hinge (mm).
*   `loop_hole_radius`: The inner radius of the keychain loop hole (mm).
*   `loop_outer_radius`: The outer radius of the keychain loop (mm).
*   `loop_hole_location`: The distance from the edge where the loop is positioned (mm).

**Specifics:**
*   The case should consist of two halves connected by a living hinge. When folded, the two halves form the case to contain SD cards.
*   The hinge should run along the short edge of the rectangular case halves.
* The two halves should be the same size and shape with the case formed by the long edge of each half aligning.

**OpenSCAD Libraries:** I would like to keep it simple for now, so I do not want to use any additional libraries.

Could you please write an OpenSCAD file that does this?

[Assistant]
SDKeyChain5b.scad:
```
/* [Cards] */
// The number of SD cards you want to fit inside
number_of_cards = 2; // [1,2,3]

// The width of the SD card (mm)
card_width = 25; // [10:50]
// The height of the SD card (mm)
card_height = 34; // [10:50]
// The depth of the SD card (mm)
card_depth = 2.25;

// The thickness you want the edges of the container to be (mm)
edge_thickness = 1; // [1,2]

/* [Hinge] */
// The thickness you want the hinge to be (mm)
hinge_thickness = 0.5; //
// The dimensions of the gap used to help the 90 degree bends (mm)
hinge_bend_gap = 0.4; //

/* [Loop] */
// The inner radius of the loop's hole (mm)
loop_hole_radius = 2.5;
// The outer radius of the loop (mm)
loop_outer_radius = 4.5;
// The location of the loop hole (mm)
loop_hole_location = 4.5;

fudge = 0.2;
halffudge = fudge / 2;

    container_depth = card_depth * number_of_cards;
    halfcontainer_depth = container_depth / 2;

    model_height = card_width + edge_thickness * 2;
    model_depth = halfcontainer_depth + edge_thickness;

    hole_depth = model_depth;

    // not including loop
    modelwidth = (card_height + edge_thickness + model_depth) * 2;

    // center x and y on axes
    translate([-model_height/2, -modelwidth/2, 0])
    difference() {
        union() {
            difference() {
                union() {
                    // main body
                    cube([model_height, modelwidth, model_depth], center = false);
                }
                union() {
                    // remove space for cards
                    translate([edge_thickness, edge_thickness, edge_thickness])
                    cube([card_width, card_height + fudge, halfcontainer_depth + fudge]);
                    translate([edge_thickness, card_height + edge_thickness + model_depth * 2, edge_thickness])
                    cube([card_width, card_height, halfcontainer_depth + fudge]);
                }
            }
            union() {
                // loop for keychain
                translate([loop_hole_location, 0, 0])
                cylinder(h = hole_depth, r = loop_outer_radius);
                translate([loop_hole_location, modelwidth, 0])
                cylinder(h = hole_depth, r = loop_outer_radius);
            }
        }
        union() {
            // hole in loop
            translate([loop_hole_location, 0, -halffudge])
            cylinder(h = hole_depth + fudge, r = loop_hole_radius);
            translate([loop_hole_location, modelwidth, -halffudge])
            cylinder(h = hole_depth + fudge, r = loop_hole_radius);

            // hinge area
            translate([-halffudge, card_height + edge_thickness, .5])
            cube([model_height + fudge, model_depth * 2 + fudge, model_depth - hinge_thickness + fudge]);

            // gap for bending
            translate([0, card_height + edge_thickness - hinge_bend_gap, 0])
            cube([model_height, hinge_bend_gap, hinge_bend_gap], center = false);
            translate([0, card_height + edge_thickness + model_depth * 2, 0])
            cube([model_height, hinge_bend_gap, hinge_bend_gap], center = false);
        }
    }

```


[User]
Okay, I'm trying to design a more robust version of a Minecraft Creeper using OpenSCAD, and I'd like to make it fully parametric. I already have a basic model, but it’s a bit hardcoded. I'd like to make some improvements and also add some features.

Here’s what I want:

1.  **Parametric Pixel Size:** The core design is based on a pixel grid. I need a parameter, `pixel_size`, that controls the size of each pixel in millimeters. The default should be 1 mm. So if I set it to 2, every unit in the model gets scaled up by a factor of 2.

2.  **Three-Part Build:** I want to be able to generate three distinct parts of the creeper, selectable by a parameter called `part`. These will be used for different things, like a single color print or a multi-extrusion print. The available options for `part` should be:
    *   `"first"`: This will create the main body with legs, and a simple head. This is meant for a regular, single-color print.
    *   `"second"`: This creates the same body, but changes the eyes and mouth to be single-extrusion-friendly. This will have a different look that is more suitable for 2 color prints.
    *   `"third"`: This just creates the face components (mouth and eyes) as separate extrudable objects. It is important that the face geometry for `"second"` and `"third"` are completely equivalent, so you can print the face separately with `"third"` and fit it on the `"second"` body.

3.  **Orientation:** The model should be initially designed lying on its side (rotated), and then placed upright when `pixel_size` is applied. So initially the design should be laid out flat, then rotated 90 degrees around the Y axis and translated up 8 units.

4. **Body:**
   * The body consists of legs, body and a head.
   * The legs are two 8x4x7 blocks located at 0,0,0 and 0,8,0 relative to the body.
   * The main body is an 8x4x12 block at 0,4,6 relative to the body.
   * The head is an 8x8x8 cube placed on top of the body.

5.  **Face (Mouth & Eyes):**
    *   The basic shape of the head is an 8x8x8 cube, but the face is not part of this.
    *   **Mouth:** For `"first"`, the mouth consists of:
        * Two 1x0.5x3.1 rectangles, offset by 2 and 5 units along the x axis, and on the bottom of the head, and then moved 0.1 units below the head.
        * Two 1x1x1 rectangles, offset by 2 and 5 units along the x axis, and on the bottom of the head.
        * One 2x0.5x3 rectangle connecting the above at 3 along the x axis.
        * One 2x1x2 rectangle connecting the above at 3 along the x axis.

        *For `"second"` the mouth consists of:*
        * Two 1x1x3.1 rectangles, offset by 2 and 5 units along the x axis, and on the bottom of the head, and then moved 0.1 units below the head.
       * One 2x1x3 rectangle connecting the above at 3 along the x axis.
    *   **Eyes:**
        *For `"first"`*
         *   **Left Eye:**
            *   Two 2x1x2 blocks at (1,2,20)
            *   A 1x2x2 block at (1,2,20)
            *   A 1x2x1 block at (2,2,21)
        *   **Right Eye:**
            *   Two 2x1x2 blocks at (5,2,20)
            *   A 1x2x2 block at (6,2,20)
            *   A 1x2x1 block at (5,2,21)

         *For `"second"`*
        *   **Left Eye:**
            *  A 1x2x2 block at (1,1,20)
            *  A 1x2x1 block at (2,1,21)
        *   **Right Eye:**
             *  A 1x2x2 block at (6,1,20)
             *  A 1x2x1 block at (5,1,21)

         *For `"third"`*
        *   **Left Eye:**
           *  A 1x1x2 block at (1,2,20)
            *  A 1x1x1 block at (2,2,21)
        *   **Right Eye:**
            *  A 1x1x2 block at (6,2,20)
            *  A 1x1x1 block at (5,2,21)
    * All coordinates are relative to the origin of the head at (0,2,16)

I think this should cover all of the major features of the design. I do not require any external libraries for this task. Can you please generate the parametric OpenSCAD file?

[Assistant]
parametric.scad:
```
//Dualstrusion or regular?
part = "first"; //[first:Body (regular),second:Body (dualstrusion),third:Face(dualstrusion)]

//Pixel size in millimeters
pixel_size = 1;

scale(pixel_size)
{
//make it on its side
translate([0,0,8]) rotate([0,90,0])
{

if(part == "first")
{
union()
{
//legs
cube([8,4,6 + 1]);
translate([0,8,0]) cube([8,4,6 + 1]);
//body
translate([0,4,6]) cube([8,4,12]);
//head
//translate([0,2,16]) cube(8);
//eyes + mouth
difference()
{
translate([0,2,16]) cube(8);

union()
{
//mouth
translate([2,2,16 - 0.1]) cube([1,0.5,3 + 0.1]);
translate([2,2,17]) cube(1);
translate([5,2,16 - 0.1]) cube([1,0.5,3 + 0.1]);
translate([5,2,17]) cube(1);
translate([3,2,17]) cube([2,0.5,3]);
translate([3,2,17]) cube([2,1,2]);
//left eye
translate([1 - 0.1,2,20]) cube([2,1,2]);
translate([1 - 0.1,2,20]) cube([1,2,2]);
translate([2 - 0.1,2,21]) cube([1,2,1]);
//right eye
translate([5 + 0.1,2,20]) cube([2,1,2]);
translate([6 + 0.1,2,20]) cube([1,2,2]);
translate([5 + 0.1,2,21]) cube([1,2,1]);
}
}
}
}
else if (part == "second")
{
union()
{
//legs
cube([8,4,6 + 1]);
translate([0,8,0]) cube([8,4,6 + 1]);
//body
translate([0,4,6]) cube([8,4,12]);
//head
//translate([0,2,16]) cube(8);

//eyes + mouth
difference()
{
translate([0,2,16]) cube(8);

union()
{
//mouth
translate([2,2,16 - 0.1]) cube([1,1,3 + 0.1]);
translate([5,2,16 - 0.1]) cube([1,1,3 + 0.1]);
translate([3,2,17]) cube([2,1,3]);
//left eye
translate([1 - 0.1,1,20]) cube([1,2,2]);
translate([2 - 0.1,1,21]) cube([1,2,1]);
//right eye
translate([6 + 0.1,1,20]) cube([1,2,2]);
translate([5 + 0.1,1,21]) cube([1,2,1]);
}
}
}
}
else if (part == "third")
{
union()
{
//mouth
translate([2,2,16 - 0.1]) cube([1,1,3 + 0.1]);
translate([5,2,16 - 0.1]) cube([1,1,3 + 0.1]);
translate([3,2,17]) cube([2,1,3]);
//left eye
translate([1 - 0.1,2,20]) cube([1,1,2]);
translate([2 - 0.1,2,21]) cube([1,1,1]);
//right eye
translate([6 + 0.1,2,20]) cube([1,1,2]);
translate([5 + 0.1,2,21]) cube([1,1,1]);
}
}

}
}
```


[User]
Okay, I'm looking to create a customizable lens holder for optical experiments. I want it to be parametric, so I can easily adjust the dimensions for different lenses and setups. I've found a basic design I like as a starting point, but I want to make it more flexible and robust.

Here's what I need the design to be able to do:

**Core Functionality:**

*   **Lens Holding:** The main function is to securely hold a lens of a specified diameter. There should be a recessed lip that fits the edge of the lens.
*   **Base Mounting:** The holder needs a base that can be mounted to a support or other equipment.
*   **Guide Rod:** It should have a guide rod extending from the side to allow for precise alignment and mounting to a rail system if needed.
*   **Set Screws:** There should be at least one, possibly two, set screw holes to lock the lens in place. These holes need to include space for a nut.

**Parametric Dimensions (I need to be able to control these):**

*   **Lens Diameter:** The diameter of the lens it's designed to hold.
*   **Lens Holder Thickness:** The overall thickness of the main lens holding cylinder.
*   **Lens Holder Lip Size:** The size of the lip that retains the lens. This should be smaller than the holder thickness.
*   **Base Diameter:** The diameter of the base for mounting.
*   **Base Height:** The height of the base.
*   **Guide Rod Length:** The length of the guide rod.
*   **Guide Rod Diameter:** The diameter of the guide rod.
*   **Set Screw Diameter:** The diameter of the set screw threads.
*   **Set Screw Nut Diameter:** The outside diameter of the nut for the set screw.
*   **Set Screw Nut Thickness:** The thickness of the nut for the set screw.

**Desired Features:**

*   **Clearance for Lens:** I want a small amount of clearance for the lens within the holder to accommodate slight variations in lens diameter and allow easy insertion.
*   **Nut Trap for Set Screw:** The design should incorporate a nut trap to hold the nut in place for the set screw, so that the nut won't rotate when the set screw is tightened, as in the original design.
*   **Two Set Screws:** I would like to have the option of two set screws, potentially on opposite sides of the lens holder, for more secure mounting if desired.
*   **Clean Design:** I'd prefer a relatively simple and clean design that will print well.

**Additional Request:**

*   I would like to use the `BOSL` library for general parametric design and avoid including `reg_polygon` and `hexagon` functions in the generated code. Specifically, I would like to use `hex()` for the nut trap.

Could you generate an OpenSCAD file with these requirements in mind? Please ensure all relevant parameters are clearly named and can be easily modified. I'm looking for a versatile lens holder that I can easily customize for my optical experiments. Thank you!

[Assistant]
Lens-custom-V2.scad:
```
//Customizable Open-source lens holder
// This is a cleaned up version of http://www.thingiverse.com/thing:26752

//CUSTOMIZER VARIABLES
//Defines the Diameter of the Lens
Lens_Diameter=25.4; //Numeric value

//Defines the Lens holder Thickness
Lens_Holder_Thickness=10;   //Numeric value

//Defines the Lens Holder Lip Size
Lens_Holder_Lip_Size=3;     //Numeric value smaller than y

//Defines the Base Diameter
Base_Diameter=25; //Numeric value

//Defines the Base Height
Base_Height=25;  //Numeric value

//Defines the Guide Rod Length
Guide_Rod_Length=20; //Numeric value

//Defines the Guide Rod Diameter
Guide_Rod_Diameter=8; //[2:12]

//Defines the Set Screw Diameter
Set_Screw_Diameter=3; //[2:10]

//Defines the Set Screw Nut Diameter
Set_Screw_Nut_Diameter=6; //[4:20]

//Defines the Set Screw Nut Thickness
Set_Screw_Nut_Thickness=3; //[2:10]

//CUSTOMIZER VARIABLES END

// ignore variable values
//Defines the Diameter of the Lens
x=Lens_Diameter; //Numeric value

//Defines the Lens holder Thickness
y=Lens_Holder_Thickness;   //Numeric value

//Defines the Lens Holder Lip Size
z=Lens_Holder_Lip_Size;     //Numeric value smaller than y

//Defines the Base Diameter
X=Base_Diameter; //Numeric value

//Defines the Base Height
Y=Base_Height;  //Numeric value

//Defines the Guide Rod Length
e=Guide_Rod_Length; //Numeric value

//Defines the Guide Rod Diameter
d=Guide_Rod_Diameter; //[2:12]

//Defines the Set Screw Diameter
a=Set_Screw_Diameter; //[2:10]

//Defines the Set Screw Nut Diameter
b=Set_Screw_Nut_Diameter; //[4:20]

//Defines the Set Screw Nut Thickness
c=Set_Screw_Nut_Thickness; //[2:10]

lens_holder();

module lens_holder(){
difference(){
cylinder(y/2,(x+10)/2,(x+10)/2);
cylinder((y+2)/2,(x-3)/2,(x-3)/2);
translate([0,0,1.5])cylinder((y+2)/2,(x+1)/2,(x+1)/2);
translate([0,(x+10)/2+5,(b+3)/2])rotate([90,0,0])cylinder(10,(a+1)/2,(a+1)/2);
translate([0,(x+8)/2,(b+3)/2])nuttrap();
translate([(x+15)/2,e/2,(d+6)/2])rotate([90,0,0])cylinder(e,(d+6)/2, (d+6)/2);
}
difference(){
translate([0,0,y/2])cylinder((y)/2,(x+5)/2,(x+5)/2);
cylinder((y)*2,(x+1)/2,(x+1)/2);
translate([0,(x+10)/2+5,(b+3)/2])rotate([90,0,0])cylinder(25,(b+3)/2,(b+3)/2);
translate([0,(x+8)/2,(b+3)/2])nuttrap();
}
difference(){
translate([0,(x+8)/2,0])set_screw((b+3)/2);
cylinder((y+2),(x+1)/2,(x+1)/2);
}
difference(){
translate([(x+15)/2,0,0])guide_rod();
rotate([0,0,90]){
#translate([0,((x+7)/-2)-((d)),(d+6)/2])rotate([90,0,0])cylinder(50,(a+1)/2,(a+1)/2);
translate([((x+7.5)/2)+((d+6)),0,0])rotate([0,0,90])set_screw1((d+6)/2);
}
}
translate([((x+7.5)/2)+((d+6)),0,0])rotate([0,0,90])set_screw((d+6)/2);
}

module guide_rod(){
difference(){
translate([0,e/2,(d+6)/2])rotate([90,0,0])cylinder(e,(d+6)/2, (d+6)/2);
translate([0,(e/2)+1,(d+6)/2])rotate([90,0,0])cylinder(e+2,(d+1)/2, (d+1)/2);
}
difference(){
translate([0,0,(d+6)/4])cube([(d+6),e,(d+6)/2], center = true);
translate([0,(e/2)+1,(d+6)/2])rotate([90,0,0])cylinder(e+2,(d+1)/2, (d+1)/2);
}
}

module set_screw(h){
difference(){
translate([0,5,h])rotate([90,0,0])cylinder(10,(b+3)/2, (b+3)/2);
#translate([0,10,h])rotate([90,0,0])cylinder(200,(a+1)/2, (a+1)/2);
translate([0,0,h])nuttrap();
}
difference(){
translate([0,0,h/2])cube([(b+3),10,h], center = true);
translate([0,6,h])rotate([90,0,0])cylinder(12,(a+1)/2, (a+1)/2);
translate([0,0,h])nuttrap();
}
}
module set_screw1(h){
translate([0,5,h])rotate([90,0,0])cylinder(10,(b+3)/2, (b+3)/2);
translate([0,0,h/2])cube([(b+3),10,h], center = true);

}

module nuttrap(){
translate([0,(c+1)/2,0])rotate([90,0,0])hexagon(c+1,(b+1)/2);
translate([0,0,(b*3)/2])cube([b+1,c+1,b*3],center = true);
}

module reg_polygon(sides,radius)
{
  function dia(r) = sqrt(pow(r*2,2)/2);  //sqrt((r*2^2)/2) if only we had an exponention op
  if(sides<2) square([radius,0]);
  if(sides==3) triangle(radius);
  if(sides==4) square([dia(radius),dia(radius)],center=true);
  if(sides>4) circle(r=radius,$fn=sides);
}

module hexagonf(radius)
{
  reg_polygon(6,radius);
}

module hexagon(height,radius)
{
  linear_extrude(height=height) hexagonf(radius);
}

```


[User]
Okay, I've been working with some loose filament spools, and I've found that existing solutions aren't quite flexible enough. I've got a design in mind, and I'd like your help creating a parametric OpenSCAD file for it.

Essentially, I need a spindle that can insert into a loose spool of filament and spin on an axis.  It needs to be adaptable to different spool sizes and mounting options. I'm thinking of this design as having a central "hub" with spokes that connect to an outer "bracket." These brackets will then hold the spool. I'd like to avoid stretching the filament when inserting the spindle, so I want a design where the spokes and brackets are inserted individually, not as a pre-assembled unit. I have attached the scad file.

Here's a breakdown of the different parts and parameters I'm envisioning:

**Terminology:**

*   **Hub:** The central support for the spindle, with embedded spoke receptacles.
*   **Centre Hole:** The hole in the center of the hub, to fit on an axis.
*   **Spoke:** The connector that joins the hub to the bracket.
*   **Bracket:** The outer support structure that holds the filament spool.
*   **Plug:** The nub of plastic that inserts into plug holes in the hub or spokes.

**General Requirements:**

*   **Parametric Design:** Everything should be easily adjustable using variables.
*   **Assembly:** The design needs to be such that brackets and spokes can be inserted into the hub one by one without stretching the filament. This requires a "plug" type fitting for the brackets into spokes, and spokes into the central hub.
*   **Support Considerations:**  I will need to print Brackets with support (for the plug) and Hubs with support (for the plug holes). Spokes should be printed vertically, with no support.
*   **Mounting Options:** I'd like to have options for mounting this spindle on a Replicator 1 (or similar) as well as using it with external spool holders.

**Specific Parameters (these are starting values, I'd like them to be configurable):**

**Hub:**

*   `Hub_Type`:  A dropdown or boolean for selecting `Replicator` mounting or `External` mounting.
*   `Centre_Hole_Diameter`: Diameter of the centre hole. Start with 52 for the Replicator, and make it adjustable to allow any size.
*   `Hub_Thickness`: Thickness of the hub body. Start with 15.

**Spoke:**

*   `Spoke_Length`: Length of the spoke. Start with 20, but let it be changed to be longer or shorter, depending on the size of the filament coil.

**Bracket:**

*   `Bracket_Diameter`: Diameter of the bracket. Start with 50.
*   `Bracket_Thickness`: Thickness of the bracket. Start with 10.
*   `Bracket_Depth`: Depth of the bracket. Start with 8.
*   `Bracket_Prong_Length`: Length of the fork extensions on the bracket in multiples of `Bracket_Thickness`. Start with 1.
*   `Filiament_Hole`: Diameter for the holes in the bracket used for storage of loose filament. Start with 4.

**Hidden Parameters:**

*   `Angular_Resolution`: Angular resolution for curves. 0.1 should be fine.
*   `Octagon_Resolution`: Angular resolution for the octagonal plug shapes. 45 should work.
*   `Decagon_Resolution`: Angular resolution for the decagon bracket bases. 36 should work.
*   `Plug_Height`: Height of the plug. Start with 10.
*   `Plug_Hole_Width`: Width of the plug hole. Start with 10.
*   `Plug_Wall_Thickness`: Thickness of the plug walls. Start with 3.
*  `Plug_Taper`: Amount of taper for the plug in mm. Start with 0.5
*  `Plug_Clearance`: Difference between plug and plughole diameters. Start with 0.15

**Modules:**

*   `print_part()`: controls which part is rendered.
*   `Hub()`: creates the hub.
*   `tube()`: creates a tube.
*   `octagontube()`: creates an octagonal tube.
*   `decagontube()`: creates a decagonal tube.
*   `plugHole()`: creates the plug hole.
*  `plug()`: creates the plug.
*   `Spoke()`: creates a spoke.
*   `Bracket_Build()`: creates bracket.
*   `Bracket()`: constructs a bracket.
*  `highlight()`: highlights a part - should be removed from final file.

**Output:**

*   I need to be able to select which part I'm rendering (Hub, Spoke, or Bracket) using the dropdown `part = "Hub";` etc.

I think that's everything.  Please let me know if you have any questions, and I'm excited to see what you can come up with!

[Assistant]
LooseFilamentSpool.scad:
```
// Loose filament spindle.
// ======================
//
// This spindle is designed to insert into a loose spool of filament and spin
// around a provided axis either on the back of a Replicator or externally.
//
// Terminology:
//
//	Hub - centre support for the spindle - has embedded spokes.
//	Centre Hole - the hole in the centre of the hub.
//	Spoke - the spoke connecting the hub to the bracket.
//	Bracket - the outer support structure designed to hold the spool of filament.
//	Plug - the nub of plastic which inserts into plug holes in the spindle
// 		or the spokes.
//
// Notes:
//
//	Check that you can assemble a full set of 3 spokes and brackets which
//	will fit loosely inside the spool of filament.
//
//	The idea is to NOT stretch the filament inserting the full hub.   There
///  is a need for loose filament to have some room to move as it unwinds.
//
//	Use the following sequence for insertion:
//
//		1) Insert one spoke/bracket set into the hub and insert this
//			into the spool of filament.
//		2) Insert the second spoke/bracket set into the spool of
//			filament and then into the hub.
//		3) Insert the second spoke/bracket set into the spool of
//			filament and then tilting the hub up slightly insert
//			into the final plug hole on the hub.
//
//	You should print Brackets with support (for the plug).
//	You should print Hubs with support (for the plug holes).
//	Print Spokes vertically at 100% - NO support is best. Horizontally
//		printed spokes will split.

/* [Global] */

// Which part are you going to build?
part = "Hub"; // [Hub:Hub, Spoke:Spoke, Bracket:Bracket]

/* [Hub] */

// Use External if you are not printing for the back of a Replicator.
Hub_Type = "Replicator"; // [Replicator, External]

// Use 52 for Replicator.
Centre_Hole_Diameter = 52; // [20:80]

// Use 15 for Replicator.
Hub_Thickness = 15; // [15:50]

/* [Spoke] */

// Use 20 as a starting point for replicator hub.
Spoke_Length =  20; // [10:100]

/* [Bracket] */

// Use 50 for Replicator.
Bracket_Diameter = 50;  // [20:50]

// Use 10 for Replicator.
Bracket_Thickness = 10;

// Use 8 for Replicator.
Bracket_Depth = 8 ;

// in units of Bracket_Thickness. Use 1 for Replicator.
Bracket_Prong_Length = 1.0;  // [1,2,3,4]

/* [Hidden] */

Angular_Resolution = 0.1;
Octagon_Resolution = 45 ;
Decagon_Resolution = 36 ;

Plug_Height = 10;  // plug height
Plug_Hole_Width = 10;  // plug hole width
Plug_Wall_Thickness = 3;   // plug wall thickness
Plug_Taper = 0.5; // Plug_Taper of plug in mm
Plug_Clearance = 0.15; // Difference between plug and plughole diameters

Filiament_Hole = 4;  // Hole in bracket when storing filament.

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////

print_part();

module print_part() {
	if (part == "Hub") {
		Hub();
	} else if (part == "Spoke") {
		Spoke();
	} else {
		Bracket();
	}
}

module highlight(this_tab) {
  if (preview_tab == this_tab) {
    color("red") child(0);
  } else {
    child(0);
  }
}

module Hub() {

	Hole_Offset = Hub_Thickness*.5*-1;
	Plug_Offset = ((Centre_Hole_Diameter/2) + Plug_Height+1)*-1;  // Add 1 to offset for Repg <<<<<<<<<<<<<

// Spacer for Replicator.
	if (Hub_Type == "Replicator") {
		translate([0,0,Hub_Thickness-1]) tube(44,(Centre_Hole_Diameter+2)/2.0,1); // For inside ring.
	}

// Main Hub
	difference() {
		tube(Hub_Thickness,(Centre_Hole_Diameter + 1 + (Plug_Height*2))/2.0,Plug_Height);  // Add 1 to radius for Repg <<<<<<<<<<<

// Radial Holes.
		union(){
			rotate([0,90,0]) translate([Hole_Offset,0,Plug_Offset])   plugHole();
			rotate([120,90,0]) translate([Hole_Offset,0,Plug_Offset])   plugHole();
			rotate([240,90,0]) translate([Hole_Offset,0,Plug_Offset])   plugHole();
		}
	}
}

module tube(height, radius, wall) {
	difference(){
		cylinder(height, radius, radius, $fa=Angular_Resolution);
		cylinder(height, radius-wall, radius-wall, $fa=Angular_Resolution);
	}
}

module octagontube(height, radius, wall) {
	difference(){
		cylinder(height, radius, radius, $fa=Octagon_Resolution);
		cylinder(height, radius-wall, radius-wall, $fa=Octagon_Resolution);
	}
}

module decagontube(height, radius, wall) {
	difference(){
		cylinder(height, radius, radius, $fa=Decagon_Resolution);
		cylinder(height, radius-wall, radius-wall, $fa=Decagon_Resolution);
	}
}

module plugHole() {
      cylinder(Plug_Height,Plug_Hole_Width/2,Plug_Hole_Width/2 - Plug_Taper,$fa=Octagon_Resolution);
}

module plug() {
      cylinder(Plug_Height,(Plug_Hole_Width-Plug_Clearance)/2,(Plug_Hole_Width-Plug_Clearance)/2 - Plug_Taper,$fa=Octagon_Resolution);
}

module Spoke() {
	difference() {
		union() {
  			octagontube(Spoke_Length,(Plug_Hole_Width+Plug_Wall_Thickness)/2,Plug_Wall_Thickness*2/2,$fa=Octagon_Resolution);
  			translate([0,0,Spoke_Length*0.99]) plug();
		}
		plugHole();
	}
}

module Bracket_Build(diameter, thickness, depth, length){

	difference() {

		union() {

// Build half a decagon tube as base for bracket.
			rotate([90,0,0])
			difference(){
				decagontube(thickness, diameter, depth) ;
				translate([diameter*-1,diameter*-1,0]) cube([diameter*2,diameter,thickness]);
			}

// Extend Forks.
    			if (length > 1 ) {
				translate([diameter*-0.99,thickness*-1,thickness*(length-1)*-0.99]) cube([thickness*0.75,thickness,thickness*(length-1)]);
   	 			translate([diameter-(thickness*0.75),thickness*-1,thickness*(length-1)*-0.99]) cube([thickness*0.75,thickness,thickness*(length-1)]);
    			}

// Add rounded top to forks.
			rotate([90,0,0]) translate([diameter*-0.91,(thickness*(length-1)*-1) + (thickness*-0.10),0]) cylinder(thickness,thickness/2,thickness/2,$fa=Angular_Resolution);
			rotate([90,0,0]) translate([diameter*0.91,(thickness*(length-1)*-1) + (thickness*-0.10),0]) cylinder(thickness,thickness/2,thickness/2,$fa=Angular_Resolution);

// Add Plug to top.
     		translate([thickness*-1,thickness*-1,diameter*0.95])cube([thickness*2,thickness,thickness/4]);
			translate([0,thickness/2*-1,diameter])plug();
		} // Union

// Insert filament holes.
		union() {
          	rotate([90,0,0]) translate([diameter*-0.91,(thickness*(length-1)*-1) + (thickness*-0.10),0]) cylinder(thickness,Filiament_Hole/2,Filiament_Hole/2,$fa=Angular_Resolution);
			rotate([90,0,0]) translate([diameter*0.91,(thickness*(length-1)*-1) + (thickness*-0.10),0]) cylinder(thickness,Filiament_Hole/2,Filiament_Hole/2,$fa=Angular_Resolution);
		}
	} //difference
}

module Bracket(){

	rotate([90,0,0]) translate([0,Bracket_Thickness,0]) Bracket_Build(Bracket_Diameter, Bracket_Thickness, Bracket_Depth, Bracket_Prong_Length);
}

```


[User]
Okay, I'm looking to design a customizable oval keychain, and I've got a basic design in mind but need to make it parametric. I'm using OpenSCAD.

Here's what I want:

*   **Shape:** The base shape should be an oval with a lip or raised border around the edge.
*   **Dimensions:**
    *   I need to control the overall `width` and `length` of the oval in millimeters.
    *   I need to control the overall `height` (thickness) of the keychain.
    *   I also need to be able to adjust the `lip` height, which is the height of the raised border and is added onto the base. This should be in millimeters as well.
*   **Text:**
    *   I want to be able to add text to the top surface of the keychain.
    *   The text content should be a variable string.
    *   The size of the text should be adjustable.
    *   I want to be able to select from different font files. I've currently been using the `write` library, which uses `.dxf` files for fonts, so a basic font is what I'm after.
*   **Ring Attachment:**
    *   The keychain needs a circular loop or tab for attaching the keyring.
    *   I need to be able to control the `radius` of this loop.
    *   I also want to control the `thickness` of the loop (i.e., how wide it is, basically how long it protrudes from the main body of the keychain)
*   **Build Plate:**
    * I also am including support for displaying a build plate for visualization. This does not need to factor into the code as far as rendering the object itself
*   **General:**
    *   I want to have a variable to control the number of facets used for cylinders and curves. I'm currently using a `$fn` parameter for that.
    * The `write` library is being used, specifically for it's font capabilities. Please be sure to include this functionality in the response.
    *  I also am using the `build_plate` library for display only, it doesn't need to factor into code relating to the object itself.

I'm thinking this would need some kind of `minkowski` operation to create the lip, and likely a difference to carve out the inner volume. I'm also open to other suggestions if there are better approaches. Can you create an OpenSCAD file that can do all of this?

[Assistant]
OvalKeychain_v2.scad:
```
include <write/Write.scad>
include <utils/build_plate.scad>

/* [Main] */

//(mm)
width=25;
//(mm)
length=50;
//(mm)
height=1.6;
//Height/Width of lip (mm)
lip=0.4;

/* [Text] */

text="Hello World";
text_size = 6;
text_font = "write/Letters.dxf";//["write/Letters.dxf":Basic,"write/orbitron.dxf":Futuristic,"write/BlackRose.dxf":Fancy]

/* [Ring] */

ring_radius=1.6;
ring_thickness=0.8;

/* [Build Plate] */

//for display only, doesn't contribute to final object
build_plate_selector = 0; //[0:Replicator 2,1: Replicator,2:Thingomatic,3:Manual]

//when Build Plate Selector is set to "manual" this controls the build plate x dimension
build_plate_manual_x = 100; //[100:400]

//when Build Plate Selector is set to "manual" this controls the build plate y dimension
build_plate_manual_y = 100; //[100:400]

/* [Hidden] */

kf_fn=25;

// preview[view:south east, tilt:top]

build_plate(build_plate_selector,build_plate_manual_x,build_plate_manual_y);

module ovalKeyChain(plateWidth=width, plateLength=length, wall=lip,plateHeight=height, tabRadius=ring_radius, tabThickness=ring_thickness,fn=kf_fn)
{
	innerRadius = (plateWidth/2)-(wall/2);
	actualBase = plateHeight-wall;
	scale = (plateLength-wall)/(plateWidth-wall);

	difference()
	{
		union()
		{
			minkowski()
			{
				scale([scale,1,1])
				{
					cylinder(r=innerRadius, h=actualBase, $fn=fn);
				}
				translate([-wall/scale,-wall/scale,0])
				{
					cube(wall);
				}
			}

			translate([-plateLength/2,0,0])
				rotate_extrude(convexity = 10, $fn=fn)
					translate([tabRadius, 0, 0])
						square([tabThickness,tabThickness]);

		}
		union()
		{
			translate([0,0,actualBase])
			{
				scale([scale,1,1.5])
				{
					cylinder(r=innerRadius, h=actualBase,$fn=fn);
				}
			}

		}
	}

}

module renderText(txt=text, txtSize=text_size, txtFont=text_font, txtDepth=height)
{
	translate([0,0,txtDepth/2])
		write(txt,h=txtSize,t=txtDepth,font=txtFont,center=true);
}

ovalKeyChain();
renderText();

```


[User]
Okay, I'm looking to design a custom GoPro mount and I've found this really great library called `gopro_mounts_mooncactus.scad`. It has a lot of the basic shapes I need, but I want to make something a little more specific.

I'd like a mount that starts with the standard GoPro triple-arm connector. I need that to be the main connection to the GoPro camera itself, so it needs to be a triple. I would like the locking nut shape to be included on this triple arm. I then want to extend it with a flexible arm. This arm should have a bend at its base, maybe around 45 degrees. I want to be able to adjust this angle in the design, so it needs to be a parameter. It also needs to have a rotation parameter at its base, so I can adjust the twist in that first section. The length of the extension arm should also be adjustable. I don't know exactly how long I'll need it, so this needs to be a parameter too.

At the end of the extension arm, I'd like to have a tripod mount. I want to be able to specify whether that's a small 1/4" screw thread or a larger 3/8" screw thread, or maybe have that be an option I can change as well.

Finally, I'd like the thickness of the extension arm walls to be adjustable.

So, to be clear, I'm looking for a parametric OpenSCAD file that does the following:

1.  Starts with a GoPro *triple* connector, including the nut shape.
2.  Extends that with an arm.
3.  The arm has a bend at its base, with an adjustable bend angle (parameter).
4.  The arm has a twist parameter at its base that controls rotation.
5.  The arm has an adjustable length (parameter).
6.  The arm has an adjustable wall thickness (parameter).
7.  The arm connects to a tripod mount with a selectable small (1/4") or large (3/8") screw size.
8. It utilizes the `gopro_mounts_mooncactus.scad` library.

I want to be able to tweak all of those parameters easily. Can you create that for me?

[Assistant]
gopro_mounts_mooncactus.scad:
```

/* [Main] */

// First head kind ("example" show them all but is not printable)
gopro_primary_kind="triple"; // [example1,example2,triple,double]
// Sedond head kind (only for the triple or double primary kind)
gopro_secondary_kind="tripod_small"; // [double,triple,rod,clamp,tripod_small,tripod_large,plate,none]
// If you rotate the seconday head you will probably need to enable support to print it
gopro_secondary_rotation=0; // [0:180]

// Optional, possibly bent axis-to-axis extension rod (length cannot be less than 21mm).
gopro_ext_len=50;
// Thickness of the extension rod walls (2 to 6mm are good values)
gopro_ext_th=2;
// Angle at the base of the extension
gopro_ext_bend_angle=50; // [0:90]
// Twist at the base of the extension
gopro_ext_twist=0; // [0:180]

// How thick are the mount walls
gopro_wall_th= 3;

/* [Rod and captive nut] */

// This tab is useful only if you have selected "rod" as the secondary head. Optional rod diameter (also the captive nut internal diameter)
gopro_captive_rod_id= 3.8;
// Angle the rod makes with the axis (0 is colinear, 90 is a right angle)
gopro_captive_rod_angle= 45; // [0:90]
// Optional captive nut thickness with freeplay (tightest would be 3.2)
gopro_rod_nut_th= 3.6;
// Optional captive nut diameter with freeplay (from corner to corner)
gopro_rod_nut_od= 8.05;

/* [Clamp/bar mount] */

// This tab is useful only if you have selected "clamp" as the secondary head.  Optional (handle)bar diameter
gopro_bar_rod_d= 35;
// How thick is the ring around the bar
gopro_bar_th= 4;
// How big is the gap between the jaws
gopro_bar_gap= 2;
// Bar screw diameter
gopro_bar_screw_d= 3;
// Diameter of the head of the screw
gopro_bar_screw_head_d= 6.4;
// Diameter of the nut of the screw from corner to corner (can be zero)
gopro_bar_screw_nut_d= 6.25;
// How thick are the shoulders on which to bolt (each side)
gopro_bar_screw_shoulder_th=5;
// Whether to reverse the bolt orientation (from which side you will screw the bolt, defaut is from the joint)
gopro_bar_screw_reversed=0; // [0:false, 1:true]

/* [Baseplate] */

// This tab is useful only if you have selected "plate" as the secondary head. Increase gopro_wall_th for sturdier shape. Plate main length:
plate_len=40;
// Width of the plate, or zero for the exact arm section (it makes the shape easier to print, but a possibly unstable base)
plate_width=0;
// Diameter of the plate screws
plate_screw_d=3.1;
// Distance from screws to the exterior of the baseplate (ie. relative to plate_len)
plate_screw_margin_outer=5;
// Space betwen optional pairs of screws. Zero to have only one screw on each side.
plate_screw_pair_spacing=0;
// Make the screw pairs into slots (needs positive plate_screw_pair_spacing). Useful for straps, for example.
plate_strap_slot=0; // [0:false, 1:true]
// Gap to leave for a strap be be sled between the plate and the rest of the shape (makes it harder to print).
plate_strap_gap=0;

/* [Hidden] */

// The gopro connector itself (you most probably do not want to change this but for the first two)

// The locking nut on the gopro mount triple arm mount (keep it tight)
gopro_nut_d= 9.2;
// How deep is this nut embossing (keep it small to avoid over-overhangs)
gopro_nut_h= 2;
// Hole diameter for the two-arm mount part
gopro_holed_two= 5.2;
// Hole diameter for the three-arm mount part
gopro_holed_three= 5.5;
// Thickness of the internal arm in the 3-arm mount part
gopro_connector_th3_middle= 3.2;
// Thickness of the side arms in the 3-arm mount part
gopro_connector_th3_side= 2.75;
// Thickness of the arms in the 2-arm mount part
gopro_connector_th2= 2.85;
// The gap in the 3-arm mount part for the two-arm
gopro_connector_gap= 2.95;
// How round are the 2 and 3-arm parts
gopro_connector_roundness= 1;

// Hole diameter for small tripod mount screws (tight-fit)
tripod_small_d=5.5;
// Hole diameter for large tripod mount screws (tight-fit)
tripod_large_d=8.4;
// Tripod base height
tripod_screw_depth=12;
// Tripod base diameter
tripod_base_d=25;

// These two settings only helps against geometrical issues (non-manifold), do not change !
gopro_connector_wall_tol=0.5+0;
gopro_tol=0.04+0;

// Can be queried from the outside
gopro_connector_z= 2*gopro_connector_th3_side+gopro_connector_th3_middle+2*gopro_connector_gap;
gopro_connector_x= gopro_connector_z;
gopro_connector_y= gopro_connector_z/2+gopro_wall_th;

///////////////////////////////////////////////////////////////////////
//
// GoPro Hero mount and joint (gopro_mounts_mooncactus.scad) - Rev 1.1
//
///////////////////////////////////////////////////////////////////////
//
// CC-BY-NC 2013 jeremie.francois@gmail.com
// https://www.linkedin.com/in/jeremiefrancois/
// https://www.thingiverse.com/thing:62800
// https://www.tridimake.com

// It slices neatly with the following parameters
//
// 0.1 mm layers (for better look & more compact FDM) -- 0.15 is still OK (and faster)
// 0.8 mm walls (loops->infill->perimeters)
// 0.8 mm bottom/top
// 100% fill (probably safer, though 30% is quite OK)
// Better use PETG instead of PLA for heat resistance.
//
// Rev 1.3: added tripod and base plate end shapes
// Rev 1.2: added vertical angle option for extension, free head rotation and rounded baseplate when needed
// Rev 1.1: added horizontal angle option for extension
// Rev 1.03: examples and first release (20130317-1234)
// Rev 1.02: added handle/bar mount and rounded the angles of the rod mount
// Rev 1.01: fixed printing angle vs captive nut slot, added a slight freeplay

/* ****************************************************************

HOW TO USE IN YOUR OWN DESIGNS

use <gopro_mounts_mooncactus.scad>

// Create a "triple" gopro connector
gopro_connector("triple");

// Create a "triple" gopro connector without the locking nut shape
translate([30,0,0])
	gopro_connector("triple", withnut=false);

// Create a "double" gopro connector
translate([60,0,0])
	gopro_connector("double");

// Add a bar mount/clamp to one of the connector
translate([90,0,0])
gopro_bar_clamp(
	rod_d= 31, // rod diameter
	th= 3.2, // main thickness
	gap= 2.4, // space between the clamps
	screw_d= 3, // screw diameter
	screw_head_d= 6.2, // screw head diameter
	screw_nut_d= 6.01, // nut diameter from corner to corner
	screw_shoulder_th=4.5, // thickness of the shoulder on which the nut clamps
	screw_reversed=false	 // true to mirror the orientation of the clamp bolts
);

// Extends a connector with a mount for a rod and an optional embedded nut
translate([120,0,0])
gopro_rod_connect(
	rod_id=3.8, // rod diameter
	angle=80,  // rod angle (0 is straight, 90 is a right turn)
	nut_th=3.2, // embedded nut thickness (can be zero to disable the embedded nut)
	nut_od=7.9 // nut diameter from corner to corner
);

// How to build a linear extruded bar extender
translate([0,65,0])
{
	gopro_connector("double");
	gopro_extended(len=50, th=3)
		scale([1,-1,1])
				gopro_connector("triple");
}

// The following dimensions are useful to attach the mount to your design:
	gopro_connector_z= 14.7;
	gopro_connector_x= 14.7;
	gopro_connector_y= 10.35;

// Finally, note that the arm are designed in a way which is not the best orientation to print: you would better rotate them with, eg. rotate([0,90,0])

**************************************************************** */

// To generate the sample set in bash, just copy/paste the following in a terminal:
/*
for kind in double triple; do
	for angle in 30 80; do
		through=true
		[[ $angle == 0 ]] && through=false
		openscad -D print_it=true -D gopro_primary_kind="\"$kind\"" -D gopro_captive_rod_angle=$angle -o gmb_${kind}_${angle}.stl gopro_mount_bit.scad
	done
	openscad -D print_it=true -D gopro_primary_kind="\"$kind\"" -D gopro_rod_nut_th=0 -o gmb_${kind}_simple.stl gopro_mount_bit.scad
done
*/

module gopro_more()
{
	for(i=[0:$children-1])
		translate([0,-2*gopro_connector_y,0]) children(i);
}
module gopro_reverse()
{
	for(i=[0:$children-1])
		scale([1,-1,1]) children(i);
}

//
// ================ Full (colored) example (for openscad & command line)
//
gopro_ext_len_real= (gopro_ext_len > 2*gopro_connector_y ? gopro_ext_len : 0);
if(gopro_primary_kind=="example1")
{
	gopro_connector("triple", withnut=true);

	color([1,0.2,0.2])
		gopro_bar_clamp(
			rod_d= gopro_bar_rod_d, th=gopro_bar_th, gap=gopro_bar_gap,
			screw_d= gopro_bar_screw_d, screw_head_d= gopro_bar_screw_head_d, screw_nut_d= gopro_bar_screw_nut_d, screw_shoulder_th= gopro_bar_screw_shoulder_th,
			screw_reversed= gopro_bar_screw_reversed	);

	rotate([0,180,130]) color([0.2,0.2,1])
		gopro_connector("double");

	rotate([0,180,130]) color([0,0.8,0])
		gopro_rod_connect(nut_th=gopro_rod_nut_th, nut_od=gopro_rod_nut_od, rod_id=gopro_captive_rod_id, angle=gopro_captive_rod_angle);

}
else if(gopro_primary_kind=="example2")
{
	color([0.6,0.6,0.6])
	{
		rotate([0,90,0]) gopro_connector("triple");
		gopro_extended_elbow(bend=60, th=gopro_ext_th)
			gopro_extended(len=gopro_ext_len, th=gopro_ext_th)
			{
				//gopro_reverse() gopro_connector("triple");
				// or (eg.)
				gopro_more()
					gopro_bar_clamp(rod_d= gopro_bar_rod_d, th= gopro_bar_th, gap= 5, screw_d= gopro_bar_screw_d, screw_head_d= gopro_bar_screw_head_d, screw_nut_d= gopro_bar_screw_nut_d, screw_shoulder_th=gopro_bar_screw_shoulder_th, screw_reversed=true, gap=2);
			}
	}
}
else // useful blocks
{
	//
	// ================ Printable standalone blocks (for the customizer)
	//
	rotate([0,90,0])
	{
		if(gopro_primary_kind=="triple")
			gopro_connector("triple", withnut=true, rounded_baseplate=(gopro_ext_twist%90!=0));
		else
			gopro_connector("double", rounded_baseplate=(gopro_ext_twist%90!=0));

			gopro_extended_elbow(rotation=gopro_ext_twist, bend=gopro_ext_bend_angle, th=gopro_ext_th)
				gopro_extended(len=gopro_ext_len_real, th=gopro_ext_th)
					rotate([0,-90,0])

		translate([0,-gopro_connector_y*2,0])
		{
			rotate([0,gopro_secondary_rotation,0])
			if(gopro_secondary_kind=="double" || gopro_secondary_kind=="triple")
			{
				translate([0,gopro_connector_y*2,0])
					scale([1,-1,1])
				if(gopro_secondary_kind=="triple")
					gopro_connector("triple", withnut=true, rounded_baseplate=(gopro_secondary_rotation%90)!=0);
				else if(gopro_secondary_kind=="double")
					gopro_connector("double", rounded_baseplate=(gopro_secondary_rotation%90)!=0);
			}
			else if(gopro_secondary_kind=="rod" && gopro_captive_rod_id>0) // Optional captive nut
			{
				gopro_join_baseplate(rounded_baseplate= (gopro_secondary_rotation%90!=0));
				gopro_rod_connect(nut_th=gopro_rod_nut_th, nut_od=gopro_rod_nut_od, rod_id=gopro_captive_rod_id, angle=gopro_captive_rod_angle);
			}
			else if(gopro_secondary_kind=="tripod_small") // Tripod mount (small, usual diameter)
			{
				gopro_join_baseplate(rounded_baseplate= (gopro_secondary_rotation%90!=0));
				gopro_tripod_connect(screw_d=tripod_small_d);  // 1/4"
			}
			else if(gopro_secondary_kind=="tripod_large") // Tripod mount (large diameter)
			{
				gopro_join_baseplate(rounded_baseplate= (gopro_secondary_rotation%90!=0));
				gopro_tripod_connect(screw_d=tripod_large_d);  // 3/8"
			}
			else if(gopro_secondary_kind=="plate")
			{
				gopro_join_baseplate(rounded_baseplate= (gopro_secondary_rotation%90!=0));
				gopro_plate_connect();
			}
			else if(gopro_secondary_kind=="clamp" && gopro_bar_rod_d>0) // Optional bar mount (can't be both!)
			{
				gopro_join_baseplate(rounded_baseplate= (gopro_secondary_rotation%90!=0));
				rotate([0,90,0])
					gopro_bar_clamp(
						rod_d= gopro_bar_rod_d,
						th= gopro_bar_th,
						gap= gopro_bar_gap,
						screw_d= gopro_bar_screw_d,
						screw_head_d= gopro_bar_screw_head_d,
						screw_nut_d= gopro_bar_screw_nut_d,
						screw_shoulder_th= gopro_bar_screw_shoulder_th,
						screw_reversed= gopro_bar_screw_reversed
					);
			}
		}
	}
}

//
// ============================= GOPRO CONNECTOR =============================
//

module gopro_torus(r,rnd)
{
	translate([0,0,rnd/2])
		rotate_extrude(convexity= 10)
			translate([r-rnd/2, 0, 0])
				circle(r= rnd/2, $fs=0.2);
}

module gopro_rcyl(r,h, center, rnd=1)
{
	translate([0,0,center ? -h/2 : 0])
	hull() {
		translate([0,0,0]) gopro_torus(r=r, rnd=rnd);
		translate([0,0,h-rnd]) gopro_torus(r=r, rnd=rnd);
	}
}

module gopro_join_baseplate(rounded_baseplate=false)
{
	// add the common start/stop base plate
	translate([0,gopro_connector_z/2+gopro_wall_th/2+gopro_connector_wall_tol,0])
	{
		if(!rounded_baseplate)
			cube([gopro_connector_z,gopro_wall_th,gopro_connector_z], center=true);
		else
			rotate([90,0,0]) cylinder(d=sqrt(2)*gopro_connector_z,h=gopro_wall_th, center=true);
	}
}

module gopro_connector(version="double", withnut=true, captive_nut_th=0, captive_nut_od=0, captive_rod_id=0, captive_nut_angle=0, rounded_baseplate=false)
{
	module gopro_profile(th)
	{
		hull()
		{
			gopro_torus(r=gopro_connector_z/2, rnd=gopro_connector_roundness);
			translate([0,0,th-gopro_connector_roundness])
				gopro_torus(r=gopro_connector_z/2, rnd=gopro_connector_roundness);
			translate([-gopro_connector_z/2,gopro_connector_z/2,0])
				cube([gopro_connector_z,gopro_wall_th,th]);
		}
	}
	difference()
	{
		union()
		{
			if(version=="double")
			{
				for(mz=[-1:2:+1]) scale([1,1,mz])
						translate([0,0,gopro_connector_th3_middle/2 + (gopro_connector_gap-gopro_connector_th2)/2]) gopro_profile(gopro_connector_th2);
			}
			if(version=="triple")
			{
				translate([0,0,-gopro_connector_th3_middle/2]) gopro_profile(gopro_connector_th3_middle);
				for(mz=[-1:2:+1]) scale([1,1,mz])
					translate([0,0,gopro_connector_th3_middle/2 + gopro_connector_gap]) gopro_profile(gopro_connector_th3_side);
			}

			gopro_join_baseplate(rounded_baseplate);

			// add the optional nut emboss
			if(version=="triple" && withnut)
			{
				translate([0,0,gopro_connector_z/2-gopro_tol])
				difference()
				{
					cylinder(r1=gopro_connector_z/2-gopro_connector_roundness/2, r2=11.5/2, h=gopro_nut_h+gopro_tol);
					cylinder(r=gopro_nut_d/2, h=gopro_connector_z/2+3.5+gopro_tol, $fn=6);
				}
			}
		}
		// remove the axis
		translate([0,0,-gopro_tol])
			cylinder(r=(version=="double" ? gopro_holed_two : gopro_holed_three)/2, h=gopro_connector_z+4*gopro_tol, center=true, $fs=1);
	}
}

//
// ============================= CAPTIVE NUT/ROD =============================
//

module gopro_rod_connect(nut_od=0, rod_id, nut_th=0, angle=0)
{
	if( (nut_th>0 && nut_od>0) || rod_id>0 )
	translate([0,gopro_connector_z,0])
	{
		// Main body mass
		difference()
		{
			hull()
			{
				translate([0,-gopro_connector_z/2+gopro_wall_th,0]) // attachment
					cube([gopro_connector_z,gopro_tol,gopro_connector_z], center=true);

				// main cylinder
				translate([gopro_connector_z/8,gopro_connector_z/4,0]) scale([0.75,0.5,1]) // optional
				gopro_rcyl(r=gopro_connector_z/2, h=gopro_connector_z, center=true, rnd=3);

				// nozzle
				rotate([0,0,angle])
					translate([0,gopro_connector_z/2-gopro_tol,0])
						rotate([-90,0,0])
								translate([0,0,-1.5]) gopro_torus(r=gopro_connector_z/2, rnd=1.5);
			}

			// Captive nut slot
			if(nut_th>0 && nut_od>0)
			{
				translate([0,0,0])
					rotate([0,(angle<18)?180:0,angle]) // easier print only for small angles
						hull()
				{
					rotate([-90,0,0]) cylinder(r=nut_od/2, h=nut_th+2*gopro_tol, $fn=6, center=true);
					translate([gopro_connector_z,0,0])
						rotate([-90,0,0]) cylinder(r=nut_od/2, h=nut_th+2*gopro_tol, $fn=6, center=true);
				}
			}

			// Carve the rod void
			if(rod_id>0)
			{
				rotate([0,0,angle])
				{
					if(angle>=80 || angle<=-80)
						rotate([-90,30,0])
							cylinder(r=rod_id/2, h=gopro_connector_z+2*gopro_tol, $fs=0.2, center=true);
					else
						translate([0,gopro_wall_th+gopro_tol*2-nut_th/2,0])
							rotate([-90,30,0])
								cylinder(r=rod_id/2, h=gopro_connector_z/2+gopro_tol, $fs=0.2);
				}
			}
		}
	}
}

//
// ============================= TRIPOD MOUNT =============================
//

module gopro_tripod_connect(screw_d)
{
	translate([0,gopro_connector_z/2+gopro_wall_th,0])
	{
		// Main body mass
		difference()
		{
			hull()
			{
				cube([gopro_connector_z,gopro_tol,gopro_connector_z], center=true);
				// nozzle
				translate([0,tripod_screw_depth,0])
					rotate([-90,0,0])
							translate([0,0,-1.5]) gopro_torus(r=tripod_base_d/2, rnd=1.5);
			}
			// Carve the screw
			translate([0,-gopro_tol,0])
				rotate([-90,30,0]) cylinder(r=screw_d/2, h=tripod_screw_depth + 2*gopro_tol, $fs=0.2);
			translate([0,tripod_screw_depth-1.5,0]) // chamfer
				rotate([-90,30,0]) cylinder(r1=screw_d/2, r2=screw_d/2+1, h=1.5 + 2*gopro_tol, $fs=0.2);
			for(r=[0:60:359])
				rotate([0,r,0])
					translate([tripod_base_d/2+4-2,0,0])
						scale([1,1,1.2])
						rotate([-90,30,0]) cylinder(d=8,h=100, $fs=0.5);
		}
	}
}

//
// ============================= BASIC PLATE MOUNT =============================
//

module gopro_plate_connect()
{
	module screws4()
	{
		for(dx=[-plate_screw_pair_spacing/2,plate_screw_pair_spacing/2])
			translate([dx,gopro_wall_th+plate_strap_gap,plate_len/2 - plate_screw_margin_outer])
				rotate([-90,0,0]) cylinder(d=plate_screw_d,h=gopro_wall_th+2*gopro_tol,center=true, $fs=0.5);
	}

	pw= (plate_width>0 ? plate_width : gopro_connector_z);
	translate([0,gopro_connector_z/2+gopro_wall_th/2,0])
	{
		difference()
		{
			union()
			{
				cube([gopro_connector_z,gopro_wall_th+gopro_tol,gopro_connector_z], center=true);
				translate([0,gopro_wall_th+plate_strap_gap,0]) // baseplate
					cube([pw, gopro_wall_th, plate_len], center=true);
				for(z=[-0.5,0.5]) scale([z,1,1])
				hull()
				{
					translate([gopro_connector_z-gopro_wall_th,0,0])
						cube([gopro_wall_th*2,gopro_wall_th,gopro_connector_z], center=true);
					translate([pw-gopro_wall_th,,gopro_wall_th+plate_strap_gap,0])
						cube([gopro_wall_th*2,gopro_wall_th,plate_len], center=true);
				}
			}
			for(dz=[-1,1]) scale([1,1,dz])
			{
				if(plate_strap_slot)
					hull() screws4();
				else
					screws4();
			}
		}
	}
}

//
// ============================= BAR CLAMP =============================
//

module gopro_bar_clamp(
	rod_d= 31,
	th= 3.2,
	gap= 2.4,
	screw_d= 3,
	screw_head_d= 6.2,
	screw_nut_d= 6.01,
	screw_shoulder_th=4.5,
	screw_reversed=1
	)
{
	module clamp_profile(r)
	{
		scale([r,r,1])
			translate([0,rod_d/2,0])
				cylinder(r=rod_d/2 + th,h=gopro_tol);
	}

	screw_x= rod_d/2+screw_head_d/2;
	translate([0,gopro_connector_z,0])
	difference()
	{
		hull()
		{
			translate([0,-gopro_connector_z/2+gopro_wall_th,0]) // attachment
				cube([gopro_connector_z,gopro_tol,gopro_connector_z], center=true);

			clamp_profile(1);
			for(m=[-1:2:+1]) scale([1,1,m])
				translate([0,0,-gopro_connector_z/2])
					clamp_profile((rod_d-0.8)/rod_d);

			// Shoulder screw support
			for(m=[-1:2:+1]) scale([m,1,1])
			{
				translate([screw_x,rod_d/2,gopro_tol/2])
					rotate([90,0,0])
						translate([0,0,-(gap+th*2)/2])
							cylinder(r=screw_head_d/2+0.78,h=gap+th*2);
			}

		}

		translate([0,rod_d/2,0])
		{
			// Main hole and gap
			translate([0,0,-gopro_tol-gopro_connector_z/2])
				cylinder(r=rod_d/2,h=gopro_connector_z+2*gopro_tol, $fs=1); // inner

			// Gap
			cube([screw_x*2 + screw_head_d*2, gap, gopro_connector_z+2*gopro_tol+1],center=true);

			// Screws
			for(mx=[-1:2:+1]) scale([mx,1,1])
			{
				translate([screw_x,0,0]) rotate([90,0,0])
				{
						translate([0,0,-rod_d/2-screw_shoulder_th]) cylinder(r=screw_d/2,h=rod_d+2*screw_shoulder_th,$fs=0.5); // screw axis
						if(screw_head_d>0)
							scale([1,1,screw_reversed?-1:1])
								translate([0,0,gap/2+screw_shoulder_th])
									cylinder(
										r1=screw_head_d/2,
										r2=1.5*screw_head_d/2,
										h=rod_d/2,$fs=0.5); // screw head
						if(screw_nut_d>0)
							scale([1,1,screw_reversed?1:-1])
								translate([0,0,gap/2+screw_shoulder_th])
									rotate([0,0,30])
										cylinder(
											r1=screw_nut_d/2,
											r2=1.5*screw_nut_d/2,
											h=rod_d/2,$fn=6); // screw nut
				}
			}

		}
	}
}

module gopro_extended_profile(th=3)
{
	for(r=[45:90:360]) rotate([0,0,r])
	{
		hull()
		{
			// corners
			translate([sqrt(2)*(gopro_connector_x/2-th/2),0,0])
			{
				intersection()
				{
					rotate([0,0,45]) square([th,th],center=true);
					circle(r=1.2*th/2,$fs=0.5);
				}
			}
			circle(r=th/2);
		}
	}
	// Internal roundness
	difference()
	{
		square([th*2,th*2],center=true);
		for(r=[0:90:360]) rotate([0,0,r])
			translate([0,th*sqrt(2)]) circle(r=th/2,$fs=0.5);
	}
}

module gopro_extended_elbow(rotation=0, bend=0, th=3)
{
	module pie_slice(radius, angle, step)
	{
		for(theta = [0:step:angle-step])
		{
			linear_extrude(height = radius*2, center=true)
				polygon( points = [[0,0],[radius * cos(theta+step) ,radius * sin(theta+step)],[radius*cos(theta),radius*sin(theta)]]);
		}
	}

	module partial_rotate_extrude(angle, radius, convexity)
	{
		intersection ()
		{
			rotate_extrude(convexity=convexity) translate([radius,0,0]) for(i=[0:$children-1]) children(i);
			pie_slice(radius*2, angle, angle/5);
		}
	}

	rotate([0,rotation+90,0])
		translate([-gopro_connector_x/2,gopro_connector_y,0])
		{
			if(bend>0)
				partial_rotate_extrude(angle=bend, radius=gopro_connector_x/2, convexity = 10)
					gopro_extended_profile(th);
			translate([cos(bend)*gopro_connector_x/2,sin(bend)*gopro_connector_x/2,0])
				rotate([0,0,bend])
					translate([0,-gopro_connector_y-gopro_tol,0])
						for(i=[0:$children-1]) children(i);
		}
}

module gopro_extended(len, th=3)
{
	linlen= max(len - 2*gopro_connector_y, 0);
	translate([0,gopro_connector_y,0])
	{
		if(linlen>0)
		{
			rotate([90,0,0])
				translate([0,0,-linlen/2])
					linear_extrude(height = linlen, center = true, convexity = 10)
						gopro_extended_profile(th);
		}
		translate([0,linlen+gopro_connector_y,0])
			for(i=[0:$children-1]) children(i);
	}
}

```


[User]
Okay, so I'm working with some 30x30 aluminum profiles and I need a cover that not only hides the profile's structure but also conceals cables running through the grooves. I've already made a quick and dirty version (coperchio_profilato_30x30.scad), but it's not parametric at all. I'd like to have a more flexible design I can adjust for different lengths and potentially different profile sizes later on.

Here's what I'm looking for:

**Core Functionality:**

*   The cover should sit flush on top of a 30x30 aluminum profile.
*   It should have a main base that wraps around the top and partially down the sides of the profile, mimicking the general shape of my example SCAD file.
*   There should be an inner "lip" or step that helps hold the cover in place and also creates the space for the cables.
*   The design needs to be parametric. I'd like to be able to control at least the following:
    *   **`length`**: The overall length of the cover.
    *   **`profile_width`**: The width of the aluminum profile (in this case, it will initially be 30mm, but I'd like to be able to change it).
    *   **`profile_height`**:  The height of the aluminum profile (initially 30mm).
    *   **`cover_thickness`**: The thickness of the main base material.
    *   **`lip_height`**: The height of the inner lip.
    *   **`lip_thickness`**: The thickness of the inner lip.
    *   **`lip_offset`**: The distance of the inner lip from the edge of the main base.

**Additional Considerations:**

*   I don't need it to completely encase the profile; it should just cover the top and part of the sides as in my example.
*   It would be helpful if the design was easy to understand and modify if I need to tweak things in the future.
*   I'm not doing anything fancy with curves or complex shapes, so simple primitives (cubes mostly) should be sufficient.

**Requested File:**

Could you please generate a parametric OpenSCAD file based on this description, using the parameters specified?  I don't need any special libraries, just vanilla OpenSCAD primitives.

[Assistant]
coperchio_profilato_30x30.scad:
```
lun=82;
cube([16,lun,1.5]);

translate([4,0,1.5]) cube([8,lun,2.4]);
translate([3.8,0,3.6]) cube([8.4,lun,1.5]);
```


[User]
Okay, I need a parametric OpenSCAD file for a chopper wheel, similar to the one I already have but with some added flexibility. I’m using it for optical experiments, part of an open-source hardware project.

The existing design (which I’ll attach, but I won't paste all the code here - it's a file called `custom-chopper.scad`) has a few key features I need to keep and extend. Here's a breakdown of what I’m looking for:

**Core Functionality:**

*   **Rotating Wheel with Interrupters:** The wheel needs to have a set of "interrupters" (slots or teeth) around its circumference for interrupting a light beam. The number and width of these interrupters are critical.
*   **Inner and Outer Radii:** It needs to have configurable inner and outer radii for both the solid wheel portion and the interrupters.
*   **Dual Phase Interrupters:** I need two sets of interrupters, one slightly phase-shifted from the other, for direction detection. These should be based on two inner radii, one for each interrupter set.
*   **Center Mounting Hole:** There needs to be a central hole to mount it to a motor shaft.
*   **Thickness:** The thickness of the wheel and the mounting hub should be configurable.
*   **M3 Mounting Nut:** It currently has a shaft-lock that is designed to accommodate an M3 nut for securing the wheel to a shaft, which should be retained.

**Desired Parametric Controls:**

1.  **Number of Interrupters (NUM_Int):** A parameter to control the total number of interrupters on the main outer track.
2.  **Outer Radius (R_OUTER):** A parameter for setting the overall radius of the wheel.
3.  **Inner Radius (R_INNER):** The radius of the filled inner section of the wheel, defining the first set of interrupters.
4.  **Inner Radius 2 (R_INNER2):**  The radius of the phase-shifted interrupters for the second track.
5.  **Mounting Hole Radius (R_HOLE):** The radius of the central hole for the motor shaft.
6.  **Border Thickness (BORDER):** The thickness of any solid border surrounding the interrupters.
7.  **Wheel Thickness (THICKNESS):** The thickness of the main wheel.
8.  **Mounting Hole Outline Thickness (THICKNESS_MOUNT):** The thickness of the mounting hub around the center hole.
9. **Interrupter Width Modifier (INT_MODIFIER):** A parameter that affects the width of the interrupters (negative values make the interrupters wider than the gaps; positive make them narrower; 0 makes them the same width).
10. **Shaft Lock Nut Parameters:** I'd like parameters for the M3 nut and screw dimensions for the shaft lock, so I don't have to hardcode them (i.e., nut diameter, nut thickness, screw diameter).
11. **Mounting Hole Outline Radius (R_MOUNT):** The radius of the outer edge of the mounting hub.
12. **Center Cross Radius (R_CROSS):** The size of the cross used for 2D encoder representations (for laser cutting).

**New Features and Flexibility:**

1.  **Optional 2D Representation:** I'd like a way to generate a 2D SVG outline of the wheel (for laser cutting or plotting) as well as the 3D model using a switch. This 2D representation should have the mounting hole and the center cross markers.
2. **Full Radius Control:** Ensure all radii are fully configurable including both interrupter sets so their widths can be controlled separately.
3.  **Clearer Variable Names:** My current code uses a lot of single-letter variables (like `z`, `a`, `b`, `c`). These should be replaced with more descriptive names for readability.
4.  **Comments:** It would also be very helpful to have more comprehensive comments throughout the code to explain each section of the code and how the parameters impact the design.
5.  **Unit Specification:** All parameters are in millimeters (mm), which should be stated in the comments.
6.  **Dependencies:** Can you please add a library dependency to handle the bolt functionality instead of hardcoding that shape? Please make sure that the license of that library is compatible with GPL-3.0.

**Libraries:**

Please use the **BOLTS** library for handling the nut and bolt geometries.

I need this to be a fully parametric design, so I can easily change the various dimensions without having to dig into the code. I'm aiming for it to be used for a range of different optical experiments.

I am hoping to have the OpenSCAD file you provide also be compatible with the GPL-3.0 license. Thank you.

[Assistant]
custom-chopper.scad:
```
// This is a customizable chopper wheel -- derived from
// Parametric encoder wheels http://www.thingiverse.com/thing:61434
// and the shaft lock from the less versatile Parametric open-source chopper wheel http://www.thingiverse.com/thing:28121

//Customizer Variables
//Number of interrupters
NUM_Int=40; // [2:120]
// Outer Radius
R_OUTER = 30;

// Filled inner radius
R_INNER = 20;

// Inner radius 2, phase shifted interrupters for direction detection
R_INNER2 = 9.5;

//Mounting hole radius
R_HOLE = 4;

// Filled Border Thickness
BORDER = 2;

//Thickness of wheel
THICKNESS = 5;

// Thickness of the mouting hole outline
THICKNESS_MOUNT = 2;

//Interrupter-width modifier, if =0 then interrupter is hole, if <0 then interrupter > hole and if >0 then interrupter < hole
INT_MODIFIER = -0.2;  // [-1:1]

//Customizer variables end

//Non-customizer variables
z=R_HOLE; //The diameter of the motor shaft.
a=6; //m3 nut Diameter
b=3; //m3 nut thickness
c=3; //m3 screw diameter
NUM_SECTIONS = NUM_Int*2; //number of sections
R_MOUNT = 3;				/* mounting hole outline radius */
R_CROSS = 1.9;			/* center-cross for 2d encoders*/

shaft_lock();

module shaft_lock(){
difference(){
cylinder(15,(z*3)/2+3,(z*3)/2+3);
rotate([90,0,0])translate([0,10,4])hexagon(b,a/2);
translate([0,-5.5,15])cube([a,b,8],center=true);
translate([0,0,10])#rotate([90,0,0])cylinder(100,(c+1)/2,(c+1)/2);
cylinder(20,(z+1)/2,(z+1)/2);
}
}

module reg_polygon(sides,radius)
{
  function dia(r) = sqrt(pow(r*2,2)/2);
  if(sides<2) square([radius,0]);
  if(sides==3) triangle(radius);
  if(sides==4) square([dia(radius),dia(radius)],center=true);
  if(sides>4) circle(r=radius,$fn=sides);
}

module hexagon_f(radius)
{
  reg_polygon(6,radius);
}

module hexagon(height,radius)
{
  linear_extrude(height=height) hexagon_f(radius);
}

$fs = 0.01;

/* generates encoder contour */
module encoder_contour(n,rin,rout,mod){
	 for (i = [1:2:n])
    {
        assign (a1 = i*360/n, a2 = (i+1+mod)*360/n )
        {
                polygon(points=[
						[cos(a2)*rin,sin(a2)*rin],
						[cos(a1)*rin,sin(a1)*rin],
						[cos(a1)*rout,sin(a1)*rout],
						[cos(a2)*rout,sin(a2)*rout]
					]);
			}
    }
}

/* use this to create a hole outline */
module hole2d(rhole,rcross){
	 circle(r = rhole);
	 polygon(points=[[0,0.1],[rcross,0],[0,-0.1],[-rcross,0] ] );
	 polygon(points=[[0.1,0],[0,rcross],[-0.1,0],[0,-rcross] ] );
}

module encoder3d(n,rin,rin2,rout,rhole,rmount,border,mod,t,tm) {
	echo();
	difference(){
		union(){
			cylinder(h=t,r=rout);
			cylinder(h=tm,r=rmount);
		}
		linear_extrude(height=5*t,center=true) encoder_contour(n,rin,rin2,mod);
		rotate([0,0,360/(4*n)]) linear_extrude(height=5*t,center=true) encoder_contour(n,rin2-$fs,rout-border,mod);
		cylinder(h=5*tm,r=rhole,center=true);
	}
}

module encoder2d(rin,rout,rhole,rcross,mod) {
	hole2d(rhole,rcross);
	encoder_contour(rin,rout,mod);
}

encoder3d(NUM_SECTIONS,R_INNER,R_INNER2,R_OUTER,R_HOLE,R_MOUNT,BORDER,INT_MODIFIER,THICKNESS,THICKNESS_MOUNT);
//encoder2d(NUM_SECTIONS,R_INNER,R_OUTER,R_HOLE,R_CROSS,INT_MODIFIER);
```


[User]
Okay, I've been working on this cool flexible tubing project and I've got a good starting point, but I need some help taking it to the next level. I've already got a SCAD file that makes a single segment of the flex tube, which I've attached. It works great, prints really easily with no infill and just a single wall thickness. I've also got a bit of a nozzle design concept that I'd like to combine with the tubing, and I need the whole thing to be parametric so I can adjust it.

Here's what I need:

I want to generate a flexible nozzle that consists of a series of connected segments, exactly like the tube segment I have created, but with the last segment of the nozzle terminating in a cylindrical extrusion. Basically, each flexible segment is identical to the `tube()` module in the file, and they should all be connected sequentially in a way that they can be bent and flexed. The last of these flexible segments should transition into the extrusion, which will have its own set of parameters for length and radius.

The parameters from my original tube design are:

*   `r`: The radius of the joint sphere.
*   `t`: Wall thickness.
*   `h`: Height of the top sphere, affects the max bending angle and inner diameter of tube.
*   `d`: Height of the bottom sphere segment. Affects how difficult it is to join parts.
*   `neck`: Determines the slope of the neck. Should not be lower than `d`.

In addition to these parameters, I need:

*   `num_segments`: The number of flexible segments that comprise the nozzle.
*   `extrusion_length`: The length of the cylindrical nozzle extrusion.
*   `extrusion_radius`: The radius of the cylindrical nozzle extrusion.

The design should use standard OpenSCAD primitives and logic. It should avoid using external libraries, and I would like to keep the final output in one single .scad file.

Can you generate a parametric OpenSCAD file that implements this nozzle design? It should be a single module that uses these parameters, and should generate a bendable nozzle with an attached extrusion. The tube segments should still print with no infill and a single wall.

I want to be able to tweak all of these parameters to get different nozzle characteristics. Thanks!

[Assistant]
flexitubenozzle.scad:
```
// Print with no infill and wall thickness t

//Resolution
$fn=48;

//Radius of joint sphere
r=7;

// Wall thickness. Don't forget to adjust slicer!
t=1;

// Height of top sphere, affects max bending angle and inner diameter of tube
h = 0.7;

// Height of bottom sphere segment. Determines how difficult it is to join parts.
d= 0.3;

// Determines slope of neck. Decrease to make tube segment longer. Should not be lower than d.
neck = 0.3;

tube(r,t,h,neck,d);

module tube(r,t,u,l1,l2)
{
  trunc_r = r*sqrt(1-u*u); // Radius of truncated circle on top sphere
  cone_h = (r+t)/l1 - (r+t)*l1; // height of cone
  cone_r = (r+t)*sqrt(1-l1*l1); // base radius
  cone_factor = trunc_r/cone_r; // Truncate cone
  zscale = r/(r+t); // Squash bottom sphere to make inside more spherical
  p = ((r+t)*l1+cone_h*(1-cone_factor))*zscale+r*u;

  union() {
    scale([1,1,zscale]) {
      truncSphere(r+t,l2,l1);
      translate([0,0,(r+t)*l1])cylinder(r1=cone_r,r2=cone_r*(cone_factor/3),h=cone_h*(1-cone_factor/4));
    }
    //translate([0,0,p])truncSphere(r,u,u);
  }
}

module truncSphere(r,h1,h2) {
  intersection() {
    sphere(r);
    translate(-r*[1,1,h1])cube(r*[2,2,h1+h2]);
  }
}

```


[User]
Okay, I'm looking to create a custom ring band using OpenSCAD, similar to the functionality of that "Ring_band_creation_script_v1.4-USA.scad" script I saw on Thingiverse. I need a script that is parametric so I can easily customize the size, shape, and text.

Here's what I need the script to be able to do:

**Ring Sizing:**

*   I need to be able to specify the ring size using US/Canadian numerical ring sizes (e.g., 6.5, 10.25, 13). I need fractional size support (e.g., 6.25 or 6.75).
*   I need to control the wall thickness (the difference between the inner and outer radius), which I'll refer to as `main_wall`. I want to be able to specify this in millimeters.
*   I need to control the width of the band, which I'll call `main_depth`, also in millimeters.
*   Finally, some of the cross-sections need a third variable, which I'll call `main_feature`.

**Cross-Section Shapes:**

I want to be able to select from a variety of cross-section shapes for the ring band. Specifically, I need all of the following:

*   `cs_ellipse`
*   `cs_rectangle`
*  `cs_pill`
*   `cs_hemi_ellipse`
*   `cs_scallopped_rectangle`
*   `cs_rounded_scallopped_rectangle`
*   `cs_rounded_hemi_ellipse`
*   `cs_rounded_rectangle`
*  `cs_chamfered_rectangle`
*  `cs_half_pill`
* `cs_reverse_hemi_ellipse`
* `cs_reverse_rounded_hemi_ellipse`
* `cs_half_chamfered_rectangle`
*  `cs_ellipse_intersection`
*  `cs_rounded_ellipse_intersection`
 I should be able to choose one of these by setting a variable (perhaps a string, as in the reference code) called `cs_shape`.

**Text:**

*   I need the ability to add text to the ring band. This should be toggled on or off with a `text_enabled` boolean variable.
*   The text should be able to be either engraved (cut into the ring) or raised (protruding from the ring). I should control this with a `text_engraved` boolean variable.
*   I need to specify if the text is on the inside or outside of the band, using a `text_inside` boolean variable.
*   I need to be able to specify the text itself using a variable called `text_itself`.
*   I need to control the height of the letters using a variable called `text_height`.
*   I need to control the depth of the engraved or raised letters using a variable `text_depth`.
*   I need to control the spacing between the letters with a `text_spacing` variable.
*   I need to be able to select the font, which will need to use the `write.scad` library. I will need to specify the path to a `.dxf` file. This should use a variable called `text_font`. The `write.scad` library from Thingiverse should be used to manage the text.

**Other Requirements:**

*   I need a `smoothness` variable to control the number of facets used in the curves of the ring; larger numbers will be smoother but take longer to render. I'd like to use this same variable to set `$fn`.
*   I need to be able to set the color of the metal using an RGBA vector, `colour_RGBA_metal` with values between 0-1.
*   There should be some small offset that helps with manifoldness etc., which is a variable called `a_bit`. Set to 0.01 in the original script is probably fine.

The script should output the ring based on the parameters specified. Can you please create the OpenSCAD code for me?

[Assistant]
Ring_band_creation_script_v1.4-USA.scad:
```
/*!
@brief Ring Band creation script
@details This OpenSCAD script will generate a plain wedding band style ring.
Most parameters are user selectable such as the ring profile shapes.
This would be ideal as the basis for a wedding ring...

@author Mark Gaffney
@version 1.4
@date 2013-03-19

@todo
Implement texturing
Implement hallmarking

@warning
Let the right one in

@note
Changes from previous versions:
1.4
 - 	added ellipse_intersection.scad code for 2 new cross section shapes (cs_ellipse_intersection & cs_rounded_ellipse_intersection)
 - 	added support for write.scad on inside or outside of ring, engraved or raised
1.3
 - 	Xxxxx's wedding ring version (no stone, no mount)
1.2
 - 	Made higher resolution shapes by increasing rotate extrude $fn from 50 to 100 and shape $fn from 20 to 40
 - 	Implemented half chamfered rectangle
1.1
 - 	Fixed issue whereby rounded rectangle shape CS appeared slightly translated in Y direction
1.0
 - 	First version based on Ring_band_creation_script_v0.10.scad
 - 	Added more cross sections (cs_half_pill, cs_reverse_hemi_ellipse, cs_reverse_rounded_hemi_ellipse)

*/
//******Fixed*Variables*******

//*************includes********
use <write/Write.scad>//http://www.thingiverse.com/thing:16193  writecylinder("Text on Cylinder",[translatex,translatey,translatez],cylinderr=20,cylinderh=40,rotate=45,center=true)
//include <write/Write.scad>//http://www.thingiverse.com/thing:16193  writecylinder("Text on Cylinder",[translatex,translatey,translatez],cylinderr=20,cylinderh=40,rotate=45,center=true)

//*******User*Variables*******

/* [Size] */ //choose ring size
//enter US numerical ring size
ring_size_us_can=6.5; //[0, 0.25, 0.5, 0.75, 1, 1.25, 1.5, 1.75, 2, 2.25, 2.5, 2.75, 3, 3.25, 3.5, 3.75, 4, 4.25, 4.5, 4.75, 5, 5.25, 5.5, 5.75, 6, 6.25, 6.5, 6.75, 7, 7.25, 7.5, 7.75, 8, 8.25, 8.5, 8.75, 9, 9.25, 9.5, 9.75, 10, 10.25, 10.5, 10.75, 11, 11.25, 11.5, 11.75, 12, 12.25, 12.5, 12.75, 13, 13.25, 13.5, 13.75, 14, 14.25, 14.5, 14.75, 15, 15.25, 15.5, 15.75, 16]
//difference between ring inner and outer radius [mm] (1 to 5)
main_wall=2;
//how wide the band of the ring is [mm] (1 to 10)
main_depth=4.34;
//this is the 3rd variable for the cross section, not used in some cross section shapes, read the instructions, OpenSCAD code or play around to figure out how/if it affects your ring
main_feature=0.2;

	main_internal_diameter=(ring_size_us_can+14.312)/1.2308;//(US, Canada size to mm ID)the diameter of the wearers finger in mm

/* [Cross Section] */ //Choose cross section shape for ring band, set one of these lines to 1 the rest to 0 to choose the cross section for the ring band
//Choose cross section shape
cs_shape="cs_half_pill";//"cs_rounded_ellipse_intersection";//[cs_ellipse, cs_rectangle, cs_pill, cs_hemi_ellipse, cs_scallopped_rectangle, cs_rounded_scallopped_rectangle, cs_rounded_hemi_ellipse, cs_rounded_rectangle, cs_chamfered_rectangle, cs_half_pill, cs_reverse_hemi_ellipse, cs_reverse_rounded_hemi_ellipse, cs_half_chamfered_rectangle, cs_ellipse_intersection, cs_rounded_ellipse_intersection]

/* [Text] */ //Choose to add text
//Do you want to add text?
text_enabled="false";//[true, false]
//Engraved or raised text?
text_engraved="true";//[true:engraved, false:raised]
//Where would you like the text?
text_inside="true";//[true:inside, false:outside]
//What do you want the text to say?
text_itself="Your Text Here";
//Height of each letter
text_height=2;
//Depth of engraved/raised letters
text_depth=1;
//Spacing between adjacent letters
text_spacing=1.1;
//Text Font
text_font="write/orbitron.dxf";//[Letters.dxf:Letter, orbitron.dxf:Orbitron, BlackRose.dxf:BlackRose, braille.dxf:Braille]

/* [Hidden] */
//how smooth and round is it? Bigger numbers mean smoother shapes but take a lot longer to render!
smoothness=20;
//choose colo(u)rs //colour of the metal in Red, Green, Blue, Opacity where the values can be anything from 0-1
colour_RGBA_metal=[0.65,0.65,0.65,1];
//something I use to help ensure manifoldness etc. do not change please!
a_bit=0.01*1;//[0.01]
$fn=smoothness*1;

//********User*Feedback****

echo("main_internal_diameter ", main_internal_diameter);

//**********Calls************

if (text_enabled=="true"){
	if (text_engraved=="true"){
		difference(){
			color(colour_RGBA_metal) ring_shape(main_internal_diameter, main_depth, main_wall, main_feature);
			ring_engraving(main_internal_diameter, main_wall, main_depth, text_inside, text_itself, text_height, text_depth, text_spacing);
		}
	}else{
		union(){//implies text is raised and has to be unioned
			color(colour_RGBA_metal) ring_shape(main_internal_diameter, main_depth, main_wall, main_feature);
			ring_engraving(main_internal_diameter, main_wall, main_depth, text_inside, text_itself, text_height, text_depth, text_spacing);
		}
	}
	//ring_compartment();
}else{//we don;t have text just make the ring itself
	color(colour_RGBA_metal) ring_shape(main_internal_diameter, main_depth, main_wall, main_feature);
}
//*******Modules************

module ring_engraving(internal_diameter=20, wall=5, depth=5, text_inside=false, text_itself="Some Text", text_height, text_depth=1, text_spacing=1.2, text_font="write/orbitron.dxf"){
	internal_radius=internal_diameter/2;
	external_radius=(internal_diameter/2)+wall;
	if (text_inside=="true"){
		mirror(1,0,0)rotate(a=[0,0,180])writecylinder(text_itself,[0,0,-depth/2],internal_radius,depth,rotate=0,t=text_depth,h=text_height,space=text_spacing,font=text_font);
	}else{
		writecylinder(text_itself,[0,0,-depth/2],external_radius,depth,rotate=0,t=text_depth,h=text_height,space=text_spacing,font=text_font);
	}
}

module ring_shape(ring_internal_diameter, ring_depth, ring_wall, ring_feature){
	rotate_extrude (convexity = 20) translate([(ring_internal_diameter)/2, 0, 0]){
		if(cs_shape=="cs_pill"){
			echo("Pill Shaped Cross Section, depth",  ring_depth, "wall",ring_wall);
			pill_shape (ring_depth, ring_wall);
		}
		else if(cs_shape=="cs_ellipse"){
			echo("Ellipse Shaped Cross Section, depth",  ring_depth, "wall",ring_wall);
			ellipse_shape (ring_depth, ring_wall);
		}
		else if(cs_shape=="cs_hemi_ellipse"){
			echo("Hemi Ellipse Shaped Cross Section, depth",  ring_depth, "wall",ring_wall);
			hemi_ellipse_shape (ring_depth, ring_wall);
		}
		else if(cs_shape=="cs_rounded_hemi_ellipse"){
			echo("Rounded Hemi Ellipse Shaped Cross Section, depth",  ring_depth, "wall",ring_wall,"feature", ring_feature);
			rounded_hemi_ellipse_shape (ring_depth, ring_wall, ring_feature);
		}
		else if(cs_shape=="cs_rectangle"){
			echo("Rectangle Shaped Cross Section, depth",  ring_depth, "wall",ring_wall);
			rectangle_shape (ring_depth, ring_wall);
		}
		else if(cs_shape=="cs_scallopped_rectangle"){
			echo("Scallopped Rectangle Shaped Cross Section, depth",  ring_depth, "wall",ring_wall,"feature", ring_feature);
			scallopped_rectangle_shape (ring_depth, ring_wall, ring_feature);
		}
		else if(cs_shape=="cs_rounded_scallopped_rectangle"){
			echo("Rounded Scallopped Rectangle Shaped Cross Section, depth",  ring_depth, "wall",ring_wall,"feature", ring_feature);
			rounded_scallopped_rectangle_shape (ring_depth, ring_wall, ring_feature);
		}
		else if(cs_shape=="cs_rounded_rectangle"){
			echo("Rounded Rectangle Shaped Cross Section, depth",  ring_depth, "wall",ring_wall,"feature", ring_feature);
			rounded_rectangle_shape (ring_depth, ring_wall, ring_feature);
		}
		else if(cs_shape=="cs_chamfered_rectangle"){
			echo("Chamfered Rectangle Shaped Cross Section, depth",  ring_depth, "wall",ring_wall,"feature", ring_feature);
			chamfered_rectangle_shape (ring_depth, ring_wall, ring_feature);
		}
		else if(cs_shape=="cs_half_pill"){
			echo("Half Pill Shaped Cross Section, depth",  ring_depth, "wall",ring_wall);
			half_pill_shape (ring_depth, ring_wall);
		}
		else if(cs_shape=="cs_reverse_hemi_ellipse"){
			echo("Reverse Hemi Ellipse Shaped Cross Section, depth",  ring_depth, "wall",ring_wall);
			translate (v=[ring_wall,0,0]) rotate(a=[0,0,180]) hemi_ellipse_shape (ring_depth, ring_wall);
		}
		else if(cs_shape=="cs_reverse_rounded_hemi_ellipse"){
		echo("Reverse Rounded Hemi Ellipse Shaped Cross Section, depth",  ring_depth, "wall", ring_wall, "feature", ring_feature);
			translate (v=[ring_wall,0,0]) rotate(a=[0,0,180]) rounded_hemi_ellipse_shape (ring_depth, ring_wall, ring_feature);
		}
		else if(cs_shape=="cs_half_chamfered_rectangle"){
			echo("Chamfered Rectangle Shaped Cross Section, depth",  ring_depth, "wall",ring_wall,"feature", ring_feature);
			half_chamfered_rectangle_shape (ring_depth, ring_wall+(sin(45)*ring_feature), ring_feature);
		}
		else if(cs_shape=="cs_ellipse_intersection"){
			echo("Ellipse Intercestion Shaped Cross Section, depth",  ring_depth, "wall",ring_wall,"feature", ring_feature);
			ellipse_intersection_shape (ring_depth, ring_wall, ring_feature);
		}
		else if(cs_shape=="cs_rounded_ellipse_intersection"){
			echo("Rounded Ellipse Intercestion Shaped Cross Section, depth",  ring_depth, "wall",ring_wall,"feature", ring_feature);
			rounded_ellipse_intersection_shape (ring_depth, ring_wall, ring_feature);
		}

//	cs_half_chamfered_rectangle=0;//not yet implemented

	}
}

//************Ring_Cross_Setion_Modules**************

module pill_shape (pill_l, pill_b){
	translate(v=[pill_b/2,0,0]){
		translate (v=[0,-(pill_l-pill_b)/2,0]) circle (r=pill_b/2, center=true);
		square (size=[pill_b, pill_l-pill_b], center=true);
		translate (v=[0,(pill_l-pill_b)/2,0]) circle(r=pill_b/2, center=true);
	}
}

module ellipse_shape (ellipse_x, ellipse_y){
	translate(v=[ellipse_y/2,0,0]) scale(v=[ellipse_y,ellipse_x]) circle(r=0.5,$fn=40, center=true);
}
module hemi_ellipse_shape(hemi_ellipse_x,hemi_ellipse_y){
	scale(v=[2*hemi_ellipse_y,hemi_ellipse_x]) difference () {
		circle(r=0.5,$fn=40, center=true);
		translate (v=[-1.5,0,0]) square (size=3, center=true);
	}
}
module rectangle_shape (rectangle_x, rectangle_y){
	translate(v=[rectangle_y/2,0,0]) square(size=[rectangle_y, rectangle_x], center=true);
}

module scallopped_rectangle_shape (scallopped_rectangle_y, scallopped_rectangle_x, scallopped_rectangle_z){
	difference (){
		rectangle_shape (scallopped_rectangle_y, scallopped_rectangle_x);
		translate(v=[scallopped_rectangle_x,0,0]) rotate(a=[0,0,180]) hemi_ellipse_shape(scallopped_rectangle_y,scallopped_rectangle_z);
	}
}

module rounded_scallopped_rectangle_shape (rounded_scallopped_rectangle_y, rounded_scallopped_rectangle_x, rounded_scallopped_rectangle_z){
	minkowski(){
		translate(v=[rounded_scallopped_rectangle_z,0,0]) difference (){
			rectangle_shape (rounded_scallopped_rectangle_y-2*rounded_scallopped_rectangle_z, rounded_scallopped_rectangle_x-2*rounded_scallopped_rectangle_z);
			translate(v=[rounded_scallopped_rectangle_x-2*rounded_scallopped_rectangle_z,0,0]) rotate(a=[0,0,180]) hemi_ellipse_shape(rounded_scallopped_rectangle_y-2*rounded_scallopped_rectangle_z,rounded_scallopped_rectangle_z);
		}
	circle(r=rounded_scallopped_rectangle_z, $fn=40);
	}
}

module rounded_hemi_ellipse_shape(rounded_ellipse_x, rounded_ellipse_y, rounded_ellipse_z){
	translate(v=[rounded_ellipse_z,0,0]){
		minkowski(){
			hemi_ellipse_shape(rounded_ellipse_x-2*rounded_ellipse_z,rounded_ellipse_y-2*rounded_ellipse_z);
			circle(r=rounded_ellipse_z, $fn=40);
		}
	}
}

module rounded_rectangle_shape(rounded_rectangle_y, rounded_rectangle_x, rounded_rectangle_z){
	translate(v=[rounded_rectangle_x/2,0,0]){
		minkowski(){
			square(size=[rounded_rectangle_x-2*rounded_rectangle_z,rounded_rectangle_y-2*rounded_rectangle_z], center=true);
			circle(r=rounded_rectangle_z, $fn=40);
		}
	}
}

module chamfered_rectangle_shape(chamfered_rectangle_y, chamfered_rectangle_x, chamfered_rectangle_z){
	translate(v=[chamfered_rectangle_x/2,-sin(45)*chamfered_rectangle_z,0]){
		minkowski(){
			square(size=[chamfered_rectangle_x-2*sin(45)*chamfered_rectangle_z,chamfered_rectangle_y-2*sin(45)*chamfered_rectangle_z],center=true);
			rotate (a=[0,0,45]) square (size=chamfered_rectangle_z);
		}
	}
}

module half_chamfered_rectangle_shape(half_chamfered_rectangle_y, half_chamfered_rectangle_x, half_chamfered_rectangle_z){
	translate(v=[-sin(45)*half_chamfered_rectangle_z,0,0]){
		difference(){
			chamfered_rectangle_shape (half_chamfered_rectangle_y, half_chamfered_rectangle_x+(sin(45)*half_chamfered_rectangle_z), half_chamfered_rectangle_z);
			//translate(v=[+sin(45)*half_chamfered_rectangle_z/2,0,0]) rectangle_shape (half_chamfered_rectangle_y+0.1, (sin(45)*half_chamfered_rectangle_z));
			translate(v=[(-0.1+sin(45)*half_chamfered_rectangle_z)/2,0,0]) square (size=[(sin(45)*half_chamfered_rectangle_z + 0.1),half_chamfered_rectangle_y+0.1], center=true);
		}
	}
}
module half_pill_shape (pill_l, pill_b){
	translate(v=[-pill_b,0,0]) difference (){
		pill_shape(pill_l,2*pill_b);
		square (size=[2*pill_b,pill_l], center=true);
	}
}

module ellipse_intersection_shape (ellipse_inter_x, ellipse_inter_y, ellipse_inter_z,rounding_rad_m=0){
	band_width_m = ellipse_inter_x;
	band_depth_m = ellipse_inter_y;
	inner_depth_ratio_m = ellipse_inter_z;
	//else{//default aligns (0,0) with the line separating the 2 sides determiend by inner_depth_ratio
	//echo("band_width_m, band_depth_m, inner_depth_ratio_m",band_width_m, band_depth_m, inner_depth_ratio_m);
	inner_height_m=(band_depth_m)*inner_depth_ratio_m;
	outer_height_m=(band_depth_m)-inner_height_m;

	inner_rad_m=(inner_height_m/2) + (band_width_m)*(band_width_m)/(8*inner_height_m);
	outer_rad_m=(outer_height_m/2) + (band_width_m)*(band_width_m)/(8*outer_height_m);
	//echo("herp inner_depth_ratio_m",inner_depth_ratio_m);

	//inner surface centred
	//echo("inner centred");
	rotate(a=-90)translate(v=[0, (band_depth_m)*inner_depth_ratio_m ]) intersection(){//translate(v=[0, (band_depth_m-2*rounding_rad_m)*inner_depth_ratio_m+rounding_rad_m ]) intersection(){
		translate(v=[0,inner_rad_m-inner_height_m]) circle(r=inner_rad_m);
		translate(v=[0,-(outer_rad_m-outer_height_m)]) circle(r=outer_rad_m);
	}
}

module rounded_ellipse_intersection_shape (rounded_ellipse_inter_x, rounded_ellipse_inter_y, rounded_ellipse_inter_z,rounded_rounding_rad_l=0.5){
	band_width_l = rounded_ellipse_inter_x;
	band_depth_l = rounded_ellipse_inter_y;
	inner_depth_ratio_l = rounded_ellipse_inter_z;
	minkowski(){
		//echo("rounded_rounding_rad_l r=",rounded_rounding_rad_l);
		circle(r=rounded_rounding_rad_l);
		translate(v=[rounded_rounding_rad_l,0])ellipse_intersection_shape (rounded_ellipse_inter_x-2*rounded_rounding_rad_l, rounded_ellipse_inter_y-2*rounded_rounding_rad_l, rounded_ellipse_inter_z,rounded_rounding_rad_l);
	}
}
```