[User]
Hey, I'm working on a model rocket design for my friend's science class, and I need some help creating the OpenSCAD files. I've got some basic ideas, and a little bit of code, but I'd prefer it if you started from scratch and generated all the files parametrically.

The first thing I need is a rocket engine spacer. This part will hold the main engine and several smaller secondary engines. Here's how it should work:

**General Structure:**

*   The spacer needs to have mounts for a central main engine and a configurable number of secondary engines spaced evenly around it.
*   It should be designed to handle both inch and millimeter measurements for all of the components.
*   I would like to include a small amount of overlap where the spacer arm is connected to the mount for additional structural support.
*   I would prefer it if the spacer was made using hulls, so that it can be resized in every dimension.

**Specific Dimensions and Parameters (these are what should be made parametric):**

*   **Units:** Let the user choose between inches and millimeters (this will need to convert all other measurements to millimeters when inches is chosen.)
*   **Wall Thickness:**  The thickness of the engine mounts should be configurable, this will be consistent throughout the model.
*  **Resolution:** The resolution should be variable, represented as $fn, to control smoothness.

**Secondary Engines:**

*   **Diameter:** The diameter of the secondary engines.
*   **Mount Height:** The height of the secondary engine mounts.
*   **Number:** The number of secondary engines around the main engine.
*   **Vertical Offset:** The vertical distance between the bottom of the main engine mount and the bottom of the secondary engine mounts.

**Main Engine:**

*   **Diameter:** The diameter of the main engine.
*   **Mount Height:** The height of the main engine mount.
*  **Vertical Offset:** The vertical distance between the bottom of the spacer and the bottom of the main engine mount.

**Spacer:**

*   **Length:** The length of the spacer arms connecting the main engine to the secondary engines.
*   **Thickness:** The thickness of the spacer arms.
*   **Height:** The overall height of the spacer.

I think that covers it. I have an idea of what I want to do for the rest of the model, but this is the first part I need. Let me know if you have any questions! Also, I will not be using any additional libraries.

[Assistant]
Engine_Spacer.scad:
```
// preview[view:south east, tilt: top diagonal]

//What units are you measuring in?
units = "Inches"; //[Inches, Millimeters]

//Wall thickness for the engine brackets
wall_t = .125;

//Resolution
$fn = 30;

/* [Secondary Engines] */

//Secondary engine diameter
se_d = 1.375;
//Secondary engine mount height
se_h = 6;
//How many secondary engines are there?
se_n = 3;
//distance between the bottom of the main engine to the bottom of the second engine
se_me_diff = 1;

/* [Main Engine] */

//Main engine diameter
me_d = 1.6875;
// main engine mount height
me_h = 3;
//distance between bottom of the spacer and the bottom of the main engine
me_s_diff = .5;

/* [Spacer] */

//Spacer length
s_l = .5625;
//Spacer thickness
s_t = .25;
//Spacer height
s_h = 1.5;

/* [Hidden] */

//Makes the spacer arms overlap
overlap_amount = wall_t*2;

engine_spacer_render();

//Builds the mount to hold the secondary rocket engines
module secondary_engine_mount(){
  difference(){
    cylinder(r = se_d/2+wall_t, h = se_h);
    cylinder(r = se_d/2, h = se_h);
  }
}

//Builds the mount to hold the main engine
module main_engine_mount(){
  difference(){
    cylinder(r = me_d/2+wall_t, h = me_h);
    cylinder(r = me_d/2, h = me_h);
  }
}

//Builds the spacer that connects the secondary engines to the main engine
module spacer(){
  _r = .001;
  difference(){
    translate([me_d/2,0,0]) rotate([0,90,0]) hull(){
      for(j = [-1:2:1])
        translate([0,s_t/2*j,0])
          cylinder(r = _r, h = s_l+overlap_amount);
        translate([-s_h,0,0])
          cylinder(r = .01, h = s_l+overlap_amount);
    }
    union(){
      cylinder(r = me_d/2, h = s_h*2.5, center = true);
      translate([s_l+(me_d/2+wall_t)+(se_d/2+wall_t),0,0])
        cylinder(r = se_d/2, h = s_h*2.5, center = true);
    }
  }
}
//Connects all of the different parts together
module engine_spacer(){
  for(i = [0:360/se_n:360])
    rotate(i){
      translate([s_l+(me_d/2+wall_t)+(se_d/2+wall_t), 0, -se_me_diff])
        secondary_engine_mount();
      translate([0,0,me_s_diff])
        spacer();
    }
  main_engine_mount();
}
//converts the model to inches if units = "Inches"
module engine_spacer_render(){
  if(units == "Inches")
   scale(25.4) engine_spacer();
  else if (units == "Millimeters")
    engine_spacer();
}

```


[User]
I'm looking to design a 16mm contact printing snoot for use with motorized sync blocks, and I'd like to be able to adjust the key dimensions. Basically, this is a light-tight tube that fits around a flashlight on one end, has a rectangular slit for the film, and then can attach to a sync block. I'd like a parametric design, so I can easily adjust sizes.

Here's what I'm envisioning:

*   **Flashlight Sleeve:** This is a cylinder that will fit around the flashlight. I need to control its diameter, and length. It also needs to have a thickness.
*   **Main Tube:** This section connects the flashlight sleeve to the slit and should be a frustum. The narrow end of the frustum should have the same width as the film. I'll need to control the overall length, the diameter of both the sleeve end, and the film end. It should also have a defined thickness.
*   **Slit:** This is a rectangular opening for the film. It needs to be placed at the end of the frustum and have an adjustable width, while the height of the slit should be the film width. The slit is essentially a rectangular cutout within a thin, round disk.
*   **Sprocket Guides:** I also need a way to guide the film in the slit, and I'm thinking a couple of small cube cutouts along the film's path would do the trick. I'll need to control their distance from the film, their depth, width and height.
*   **Sync Block Mount:** I'll need two cylinders on the film side to use with a sync block. I think just two pegs would be fine.

Key parameters should include:

*   `FLASHLIGHT_DIAMETER`: Diameter of the flashlight.
*   `SLEEVE_LENGTH`: Length of the flashlight sleeve.
*   `SNOOT_THICKNESS`: Thickness of the walls.
*  `FILM_WIDTH`: Width of the film.
*   `TUBE_LENGTH`: Length of the frustum section.
*   `SLIT_WIDTH`: Width of the film slit.
*  `SPROCKET_WIDTH`: Width of the sprocket guide.
* `SPROCKET_DISTANCE`: Distance of the sprocket guide from the center of the film path.
*  `SYNC_PEG_DIAMETER`: Diameter of the sync pegs.
*  `SYNC_PEG_DISTANCE`: Distance of the sync pegs from the center.
* `SYNC_PEG_OFFSET`: Distance of the sync pegs from the end of the tube.

I’d like this to be in OpenSCAD, with no external libraries needed for the core functionality.

[Assistant]
snoot.scad:
```
$fn = 140;

FILM = 16; //Film width
GATE = 16; //Gate width
SPROCKET = 4; //Sprocket width
FL_D = 27;	//Flashlight diameter
SLEEVE = 10;//Sleeve length
T = 3; 		//Snoot thickness
DIST = 25.4;//Slit distance
SLIT_VALUE = 1; //Slit width

module snoot (SLIT = 1) {
    //flashlight sleeve
  	difference () {
		cylinder(r = (FL_D / 2) + T, h = SLEEVE, center = true);
    	cylinder(r = (FL_D / 2), h = SLEEVE + 1, center = true);
	}

  	//tube
  	translate ([0, 0, -(SLEEVE / 2) - (DIST / 2) + (T / 2)]) {
    	difference () {
    		cylinder(r2 = (FL_D / 2) + T, r1 = (FILM / 2) + (T / 2), h = DIST - T, center = true);
      		cylinder(r2 = (FL_D / 2), r1 = (FILM / 2), h = DIST - T + .1, center = true);
            translate([0, 1, 0]) {
                cube([SLIT , FILM, T + 1], center = true);
            }
      	}
    }

    //tube + slit joiner
    translate ([0, 0, -(SLEEVE / 2) - DIST + T]) {
      difference () {
          cylinder(r = (FILM / 2) + (T / 2), h = T, center = true);
      	  translate([0, 0, 0]) {
        	cube([SLIT , FILM, T + 1], center = true);
        }
      }
    }

  	//slit
  	translate ([0, 1, -(SLEEVE / 2) - DIST + (T / 2) - 1]) {
    	difference () {
      		intersection () {
        		translate ([0, -1, 0]) cylinder(r = (FILM / 2) + (T / 2), h = T, center = true);
    			translate ([0, -3, 0]) cube([FILM + (T * 2), FILM + T, T], center = true);

        		translate ([0, 0, 0]) rotate([90, 0, 0]) {
          			scale([3, .6, 1]) cylinder(r = T / 1.2, h = FILM + T * 2, center = true);
          			translate ([0, 1.6, 0]) cube([(T / 1.2) * 2 * 3, (T / 1.2) * 2 * .6, FILM + T * 2], center = true);
          		}
        	}

        	translate([0, -1, 0]) cube([SLIT, FILM, T + 1], center = true); //slit

      		//sprocket
    		translate([0, (FILM / 2) - (SPROCKET / 2) + (T / 2) - 1, 0]) cube([SLIT + T * 6, SPROCKET, T + 1], center = true);

    	}
	}
    difference () {
        union () {
            translate([0, (16 / 2) + 1.1, -SLEEVE - DIST + 9]) rotate([90, 0, 0]) {
                cylinder(r = 16 / 2, h = 2, center = true);
            }

            translate([0, -(16 / 2) - 1.1, -SLEEVE - DIST + 9]) rotate([90, 0, 0]) {
                cylinder(r = 16 / 2, h = 2, center = true);
            }
        }
        translate ([0, 0, -(SLEEVE / 2) - (DIST / 2) + (T / 2)]) {
            cylinder(r2 = (FL_D / 2), r1 = (FILM / 2), h = DIST - T + .1, center = true);
        }
    }
}

module flat_path () {
    L = .5;
    cube([L, 16, 3], center = true);
    translate([0, (16 / 2) - (3 / 2), 2]) cube([L, 3, 3], center = true);
    translate([0, -(16 / 2) + (3 / 2), 2]) cube([L, 3, 3], center = true);

    translate([0, (16 / 2) - (3 / 2), 3.5]) cube([L, 1.5, 3], center = true);
}

snoot(SLIT_VALUE);

```


[User]
Hey, I'm looking for an OpenSCAD design for a square key, something I can customize easily.

I need the key part to be a specific width and length, with a hole in the center of the key part. Surrounding the key should be a skirt and then a larger, square grip with rounded corners. The grip should have cutouts at each corner. I'm thinking something like a doorknob-type grip, but square.

Here's a breakdown of the parts and the parameters I need to be able to control:

*   **Keyway:**
    *   `keywidth`: The width of the square key part.
    *   `keylength`: The length of the square key part.
    *   `holediameter`: The diameter of the hole going through the key part.

*   **Skirt:**
    *   `skirtheight`: The height of the skirt part connecting the key to the grip.
    *   The skirt should transition smoothly between the hole diameter at the key and the rounded part of the grip.

*   **Grip:**
    *   `gripdiameter`: The diameter (or width) of the square grip.
    *   `gripheight`: The height of the grip.
    *   `cutout`: The amount to cut out of the corners of the grip, so it has rounded corners.

*   **General:**
    *   `smoothness`: A value to control how smooth the curves are when creating cylinders and spheres. I'd prefer to adjust the `$fn` variable globally rather than having to change it in every module.

The design should start with the keyway, then a skirt that flares out to connect with a grip. The grip itself should be a square cube, with the four corner cutouts, creating rounded corners. Then, to make sure it prints well, the bottom of the skirt should have a rounded edge. There should be a single primary file that contains the final design. I'm thinking the bottom of the entire thing should be at Z=0, so I don't have to do weird translations in other software.

I'd like the design to be fully parametric, so I can change any of these parameters and the whole thing updates. I don't expect you to be using any external libraries. Can you generate the SCAD file(s) for this?

[Assistant]
squarekey.scad:
```
keywidth = 7.2;
keylength = 7;
holediameter = 15.5;
gripdiameter = 55;
gripheight = 8;
cutout = 3;
skirtheight = 8;
smoothness = 100;
tocorner = sqrt((gripdiameter / 2) * (gripdiameter / 2) * 2);
bottomradius = (tocorner - ((gripdiameter - cutout) / 2)) - 0;

module keyway(keywidth, keylength, holediameter) {
    difference() {
        cylinder((keylength + 2), (holediameter / 2), (holediameter / 2), $fn=smoothness, center=true);
        translate([0, 0, 1.5])
            cube([keywidth, keywidth, (keylength + 1)], center=true);
    }
}

module skirt(holediameter, gripdiameter, cutout, skirtheight) {
    translate([0, 0, -((skirtheight / 2) + ((keylength / 2) + 1))])
        cylinder(skirtheight, bottomradius, (holediameter / 2), center=true);
}

module cutout(height, diameter) {
    circleradius = (diameter - cutout) / 2;
    cylinder(height + 1, circleradius, circleradius, $fn=smoothness, center=true);
}

module grip(diameter, height, keylength) {
    translate([0, 0, -((height / 2) + ((keylength / 2) + 1) + skirtheight)])
        difference() {
            cube([diameter, diameter, height], center=true);
            translate([(diameter / 2), (diameter / 2), 0])
                cutout(height, diameter);
            translate([-(diameter / 2), (diameter / 2), 0])
                cutout(height, diameter);
            translate([(diameter / 2), -(diameter / 2), 0])
                cutout(height, diameter);
            translate([-(diameter / 2), -(diameter / 2), 0])
                cutout(height, diameter);
        }
}

difference() {
    union() {
        keyway(keywidth, keylength, holediameter);
        difference() {
            hull() {
                skirt(holediameter, gripdiameter, cutout, skirtheight);
                grip(gripdiameter, gripheight, keylength);
            }
            translate([(gripdiameter / 2), (gripdiameter / 2), 0])
                cutout(200, gripdiameter);
            translate([-(gripdiameter / 2), (gripdiameter / 2), 0])
                cutout(200, gripdiameter);
            translate([(gripdiameter / 2), -(gripdiameter / 2), 0])
                cutout(200, gripdiameter);
            translate([-(gripdiameter / 2), -(gripdiameter / 2), 0])
                cutout(200, gripdiameter);
        }
    }
    translate([0, 0, -((gripheight / 2) + ((keylength / 2) + 1) + skirtheight + (gripheight/3) + (gripheight/2))])
        resize(newsize=[((bottomradius*2)*0.8),((bottomradius*2)*0.8),((gripheight+skirtheight)*2)]) sphere(r=(gripheight+skirtheight), $fn=100);
}
```


[User]
Hey, I'm looking to design a custom Z-axis shim for my FlashForge Creator Pro 2016 3D printer, similar to the one I found on Thingiverse (thing:1886458). I need it to adjust the Z endstop height when I use a glass bed.

Essentially, it's a rectangular block with cutouts to fit around the Z-axis rods and screws. I need to be able to customize the height of the shim (how much lower the Z homing will be), the thickness of the clamping part (the bit that sits on the rods), and I'd also like to be able to toggle whether the thickness is printed on the model itself.

Here are the specific parameters I need to control:

*   **`ShimHeight`**: The distance the Z homing needs to be lowered. This should be adjustable in 0.1mm increments, probably between 1mm and 10mm.
*   **`ClampHeight`**: The thickness of the clamping section. This should also be adjustable in 0.1mm increments between 2mm and 10mm.
*   **`Label`**: A boolean to toggle printing the `ShimHeight` value on the model. It should be a simple text label on one of the sides, like the original.
*   **`Reinforce`**: An option for adding a reinforcing strut, useful if the `ShimHeight` is smaller than the `ClampHeight`. This can be a simple trapezoid shape.

The original model also had some internal dimensions that are probably important. The rod spacing seems to be 100mm, the rod diameter is 19mm, and the screw holes are about 7.155mm from the main body, though that doesn't need to be directly controlled by a parameter. I want the shim to be able to slightly clamp onto the rods (as the original one did) but not too aggressively, so any adjustments to the original dimensions will need to keep that in mind. I don't want to have to define the locations of these holes and cutouts by hand, but would rather the code calculate those based on the rod diameter and rod spacing, like the original.

I'd like you to generate the OpenSCAD code for this, with all the appropriate parameters and logic in it. I'm hoping this will let me create custom-sized shims easily in the future! Thanks!

[Assistant]
CustomizableZAxisShim_v2.scad:
```
// Customizable Z-axis shim for FlashForge Creator Pro 2016 by DrLex
// Based on Thing 1475239 by ben8p and Thing 557994 by Atomist
// Released under Creative Commons - Attribution - Share Alike license
// v2, 2017/07/30

// The distance you want the Z homing to be lowered.
ShimHeight = 3; // [1:0.1:10]
// How thick the clamping part should be.
ClampHeight = 4; // [2:0.1:10]
// Print the thickness on the model?
Label = "yes"; // [yes, no]
// Useful for very thin thims where Shimheight is smaller than ClampHeight.
Reinforce = "no"; // [yes, no]

/* [Hidden] */
RodDistance = 100; // [80:0.1:120]
RodDiameter = 19; // [15:0.1:25]

RodRadius = RodDiameter/2;
RodCenter = RodDistance/2 + 0.1;
MaxX = RodCenter - 2.85;
ClampScale = [1, 1.062, 1];

difference() {
    union() {
        difference() {
            union() {
                translate([-MaxX, 3, 0]) cube([2*MaxX, 13.88, ShimHeight]);
                translate([0, -2.0, ClampHeight/2]) cube([RodDistance, 10, ClampHeight], center=true);
                translate([RodCenter, -7.15, ClampHeight/2]) scale(ClampScale) cylinder(r=RodRadius + 2, h=ClampHeight, center=true, $fn=32);
                translate([-RodCenter, -7.15, ClampHeight/2]) scale(ClampScale) cylinder(r=RodRadius + 2, h=ClampHeight, center=true, $fn=32);
            }

            // Rod holes
            translate([RodCenter, -7.15, 9]) scale(ClampScale) cylinder(r=RodRadius, h=20, center=true, $fn=32);
            translate([-RodCenter, -7.15, 9]) scale(ClampScale) cylinder(r=RodRadius, h=20, center=true, $fn=32);

            // Side screw holes
            translate([MaxX, 7.155, 9]) cylinder(r=3.1, h=20, center=true);
            translate([-MaxX, 7.155, 9]) cylinder(r=3.1, h=20, center=true);

            // Chop off the sides
            translate([MaxX, -2*RodDiameter, -5]) cube([RodDiameter, 4 * RodDiameter, 20]);
            translate([-MaxX - RodDiameter, -2*RodDiameter, -5]) cube([RodDiameter, 4 * RodDiameter, 20]);
            // Chop off the center
            translate([0, -10, 9]) cube([2*(RodCenter - RodRadius - 2), 20, 20], center=true);

            if(ClampHeight > ShimHeight) {
                // Remove pieces of the clamps sticking out
                translate([-MaxX - 1, 3, ShimHeight]) cube([2*MaxX + 2, 13.88, 20]);
            }
        }

        if(Reinforce == "yes") {
            translate([0, 1.85, ClampHeight/2]) isoTrapezoidX(22, 30, 3.7, ClampHeight);
        }
    }

    // Space for leadscrew bearing
    if(Reinforce == "yes") {
        translate([0, 0, ClampHeight/2]) isoTrapezoidX(18, 28, 5, ClampHeight+0.1);
    }
    else {
        translate([0, 0, 9]) cube([21.35, 7, 20], center=true);
    }

    if(Label == "yes") {
        translate([MaxX-9, 4, ShimHeight - 0.2]) linear_extrude(1)  text(str(ShimHeight, " mm"), 4.5, font="Roboto", halign="right", $fn=14);
    }
}

module isoTrapezoidX(sizeXTop, sizeXBtm, sizeY, sizeZ) {
    linear_extrude(height=sizeZ, center=true) polygon([[-sizeXTop/2, sizeY/2], [sizeXTop/2, sizeY/2], [sizeXBtm/2, -sizeY/2], [-sizeXBtm/2, -sizeY/2]]);

}
```


[User]
Hey, I'm looking to get a parametric OpenSCAD design for a small, customizable retainer bracket. I've got an existing design but it's not as flexible as I'd like, and I'd prefer to have a fresh design with some different parameters.

Here's the basic idea: It's a bracket with a pin that sticks out, meant to hold something in place, like a blind or shade. The bracket itself attaches to a wall or surface with two screws. I need to be able to adjust a few things:

*   **Pin Distance:** How far the pin protrudes from the mounting surface (the wall).
*   **Pin Length:** The length of the pin itself.
*   **Pin Width:** The diameter of the pin.
*   **Bracket Thickness:** How thick the overall bracket is.
*  **Pin Flange:** This is the area where the pin connects to the body of the bracket.
*   **Screw Hole Size:** The diameter of the holes for the mounting screws.
*   **Screw Hole Distance:** The distance between the centers of the screw holes.
*   **Tab Height:** The height of the main rectangular portion of the bracket.
*  **Tab Width:** The width of the main rectangular portion of the bracket.

I'd like the pin to have a rounded end, using a technique similar to a `rcylinder`, and it would be great to have the option to print the part either laying flat on the print bed or standing upright, as printing flat would be easier and require no supports, but might be weaker.

I am not using any special libraries and the attached file is not intended to be used as part of your response. Could you generate one or more .scad files for me?

[Assistant]
BilndRetainerV1.scad:
```
// preview[view:south, tilt:top]

// Laying flat will print easier without supports but will not be as strong.
layFlat = "no"; // [yes,no]
// How far from the wall should the pin be?
pinDistance = 35;
// How long should the pin be?
pinLength = 5;
// Width of the pin
pinWidth = 3;
// Thickness of the part
thickness = 3;
// size of the area around the pin
pinFlange = 5;
// Size of the screw holes
holeSize = 4;
// Distance between the screw holes
holeDistance = 11;
// size of the tab
height = 15;
// width of the tab
width = 25;

/* [Hidden] */
outerCurve = (pinWidth*2) + pinFlange;

function rotationAngle(layFlat) = (layFlat) == "no" ? 90 : 0;

rotate(a=[rotationAngle(layFlat),0,0]) {
union() {

    translate([pinDistance+thickness,0,0]) {
        bezelRadious = 0.5;
        translate([0,0,thickness-bezelRadious]) {
            rcylinder(r1=pinWidth/2,r2=pinWidth/2,h=pinLength+bezelRadious,b=bezelRadious,$fn=90);
        }
        cylinder(thickness,outerCurve/2,outerCurve/2,$fn=90);
    }

    centerPoint = [pinDistance+thickness,0];
    radius=outerCurve/2;

    outerPoint1=[thickness,width/2];
    dx1 = centerPoint.x - outerPoint1.x;
    dy1 = centerPoint.y - outerPoint1.y;
    dd1 = sqrt(dx1*dx1 + dy1*dy1);
    a1 = asin(radius / dd1);
    b1 = atan2(dy1, dx1);
    ta1 = b1 + a1;
    tangent1Point1 = [centerPoint.x + radius*-sin(ta1), centerPoint.y + radius*cos(ta1)];
    tb1 = b1 - a1;
    tangent1Point2 = [centerPoint.x + radius*sin(tb1), centerPoint.y + radius*-cos(tb1)];

    outerPoint2=[thickness,-width/2];
    dx2 = centerPoint.x - outerPoint2.x;
    dy2 = centerPoint.y - outerPoint2.y;
    dd2 = sqrt(dx2*dx2 + dy2*dy2);
    a2 = asin(radius / dd2);
    b2 = atan2(dy2, dx2);
    ta2 = b2 + a2;
    tangent2Point1 = [centerPoint.x + radius*-sin(ta2), centerPoint.y + radius*cos(ta2)];
    tb2 = b2 - a2;
    tangent2Point2 = [centerPoint.x + radius*sin(tb2), centerPoint.y + radius*-cos(tb2)];

    linear_extrude(height = thickness)
    polygon(points=[outerPoint1,outerPoint2,tangent2Point2,tangent1Point1]);

    difference() {
        translate([0,-width/2,0]) {
            cube([thickness,width,height], center=false);
        }

        translate([-0.5,-holeDistance/2,(height/2)-(holeSize/2)+thickness]) {
            rotate(a=[0,90,0]) {
                cylinder(thickness+1,holeSize/2,holeSize/2,$fn=90);
            }
        }

        translate([-0.5,holeDistance/2,(height/2)-(holeSize/2)+thickness]) {
            rotate(a=[0,90,0]) {
                cylinder(thickness+1,holeSize/2,holeSize/2,$fn=90);
            }
        }
    }
}
}
module rcylinder(r1=10,r2=10,h=10,b=2)
{hull(){rotate_extrude() translate([r1-b,b,0]) circle(r = b); rotate_extrude() translate([r2-b, h-b, 0]) circle(r = b);}}

```


[User]
I'd like to design a parametric plant pot for 3D printing, and I'm hoping you can help me create the OpenSCAD code for it.

Here's what I'm looking for:

*   **Basic Shape:** A simple, truncated cone shape. The base will have a smaller diameter than the top.
*   **Parameters:** I want to be able to easily adjust the following:
    *   `baseD`: Diameter of the base of the pot (in mm).
    *   `potH`: Height of the pot (in mm).
    *   `sideSlope`: The angle (in degrees) of the sides relative to vertical, creating the cone shape.
    *   `potThick`: Thickness of the pot's walls (in mm).
    *   `nHoles`: The number of drainage holes in the base.
    *   `sHoles`: The diameter of each drainage hole (in mm).
*   **Drainage Holes:** The holes should be evenly spaced around the center of the base.

I think it would be good to use a Minkowski sum to round out the transition to the thickness, but I don't think that's strictly necessary.

Basically, I want a pot that can be easily customized, with or without drainage holes. I'd like to be able to print it as one part, without any special support structures (though I know the side angle will matter, and should be reasonable).

Could you generate the OpenSCAD code for this? I'm not using any special libraries.

[Assistant]
SimpleParametricPot2.scad:
```
//simple plant pot

//Diameter of base in mm
baseD = 35;

//Height of pot in mm
potH = 40;

// The sides are this many degrees from verticle
sideSlope = 10; //[0:1:90]

//Thickness of the pot size
potThick = 1;

/* [Holes in Base] */

// Number of holes
nHoles = 6;//[0:1:10]

// Size of Holes diameter in mm
sHoles = 3;//

difference() {
    pot();
    holes(nHoles, sHoles);
}

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

module holes(n, s){
    for(i = [0:n]){
        rotate([0,0,i*360/n]) translate([baseD/4,0,0]) cylinder(d=s, h=2*potThick, center=true, $fn=16);
    }
}

module pot(){
difference(){
minkowski(){
cylinder(d1=baseD, d2=baseD+potH*tan(sideSlope) , h=potH, $fa=3);
sphere(r=potThick, $fn=16);
}//!minkowski
cylinder(d1=baseD, d2=baseD+potH*tan(sideSlope) , h=potH, $fa=3);
//slice top off
translate([0,0,potH]) cylinder(d=2*baseD, h= 2*potThick, center=true);

}//!diff
}
```


[User]
I'd like to design a parametric propeller guard for a small quadcopter, and I'd like to use OpenSCAD to create the model. The guard should have a few key features: a motor mount, arms extending outwards, and a circular guard ring. I'd like to be able to easily adjust these dimensions via parameters.

Here's a breakdown of the features and parameters I envision:

**Motor Mount:**

*   **`motor_d`:** The internal diameter of the motor mount cylinder.
*   **`motor_h`:** The height of the motor mount cylinder.
*   **`motor_t`:** The thickness of the motor mount cylinder walls.
*   **`pin_h`:** The height of the mounting pin that extends from the motor mount.
*   **`pin_w`:** The width of the mounting pin.
*   **`pin_r`:** The rotation angle of the mounting pin around the Z-axis, so I can position it anywhere around the mount's circumference.
*   **`cut_w`:** The width of a cutout in the motor mount cylinder which allows it to flex and grip a motor.
*   **`cut_b`:** The thickness of a thin web left at the base of the cutout, for drilling/reaming purposes.
*   **`cut_r`:** The rotation of the cutout around the Z-axis, so I can position it anywhere around the mount's circumference.

**Arms:**

*   **`arm_l`:** The length of the arms extending from the center of the motor mount to the guard ring.
*   **`arm_base_h`:** The height of the arm at its base (where it connects to the motor mount).
*   **`arm_base_w`:** The width of the arm at its base.
*   **`arm_a`:** The angle between the two primary arms, for a "U-shaped" guard design.
*   **`center_arm`:** A boolean value (0 for false, 1 for true) to add a third arm between the two primary arms for additional support.

**Guard Ring:**

*   **`guard_h`:** The height of the guard ring.
*   **`guard_w`:** The width/thickness of the guard ring.

**General:**

*   **`fillet_r`:** A fillet radius for smoothing all of the joints between the motor mount, arms, and guard ring. This should strengthen the part.

The code should include a module named `prop_guard()` that generates the entire assembly based on the above parameters. It should also include separate modules such as `arm()`, `motor_pin()`, and `motor_clip_cut()` to keep the code organized. It will also be important to be able to remove the back side of the guard ring, so that the guard isn't a full circle, given my arm angles may not always add up to 360 degrees. You'll need to create a function to handle this `remove_back_guard()`.

Also, please make use of the `fillet()` function, which includes a `fillet_two()` module, and the `offset_3d()` module. I'm providing the code for this custom fillet module below:

```openscad
module fillet(r=1.0,steps=3,include=true) {
  if(include) for (k=[0:$children-1]) {
	children(k);
  }
  for (i=[0:$children-2] ) {
    for(j=[i+1:$children-1] ) {
	fillet_two(r=r,steps=steps) {
	  children(i);
	  children(j);
	  intersection() {
		children(i);
		children(j);
	  }
	}
    }
  }
}

module fillet_two(r=1.0,steps=3) {
  for(step=[1:steps]) {
	hull() {
	  render() intersection() {
		children(0);
		offset_3d(r=r*step/steps) children(2);
	  }
	  render() intersection() {
		children(1);
		offset_3d(r=r*(steps-step+1)/steps) children(2);
	  }
	}
  }
}

module offset_3d(r=1.0) {
  for(k=[0:$children-1]) minkowski() {
	children(k);
	sphere(r=r,$fn=8);
  }
}
```
I don't need you to write any code for the provided fillet library, but I'll need you to incorporate it into the other modules.

I'd like to have a clean and fully parameterized model that I can use as a base for different prop guard designs.

[Assistant]
Dreamcatcher_Prop_Guard.scad:
```
// motor clip internal diameter
motor_d = 8.5;
// motor clip height
motor_h = 3;
// motor clip thickness
motor_t = 2.5;
// motor clip pin height
pin_h = 5;
// motor clip pin width
pin_w = 7;
// motor clip pin rotation around Z
pin_r = 0;
// motor clip cut width
cut_w = 2;
// motor clip cut solid base
cut_b = 0.4;
// motor clip cut rotation around Z
cut_r = 0;
// guard height
guard_h = 2;
// guard width
guard_w = 2;
// arm length from motor center
arm_l = 37;
// arm base height
arm_base_h = 3;
// arm base width
arm_base_w = 3;
// angle between the two arms
arm_a = 120;
// add center arm
center_arm = 0; //[0:False, 1:True]
// fillet radius
fillet_r = 3;

module prop_guard() {
    $fn=40;
    third_arm_a = center_arm?0:arm_a/2;

     difference() {

        //union base/arm/guard assembly, with motor pin
        union() {
            //fillet joints between motor base cylinder, arms, and guard
            fillet(r=(fillet_r < 0.1?0.1:fillet_r), steps=5) { //fillet doesn't work for fillet radius <= 0
                arm(-arm_a/2);
                arm(third_arm_a);
                arm(arm_a/2);
                cylinder(r=motor_d/2 + motor_t, h=motor_h);
                difference() {
                    cylinder(r=arm_l, h=guard_h);
                    cylinder(r=arm_l-guard_w, h=guard_h);
                }
            }

            //motor pin, at specified width, height and rotation around Z
            motor_pin();

        }

        //version of OpenSCAD used doesn't have rotate_extrude for a limited angle - only does 360 degrees
        // so need to hack away the rear part of the guard
        remove_back_guard();

        //remove motor inner diameter
        cylinder(r=motor_d/2, h=motor_h);

        //hollow out motor clip cut, at specified width, with specified base web
        motor_clip_cut();
    }
}

module arm(angle) {
    rotate([0, 0, angle]) {
        hull() {
            cylinder(r=arm_base_w/2, h=arm_base_h);
            translate([arm_l-guard_w/2, 0, 0])cylinder(r=guard_w/2, h=guard_h);
        }
    }
}

module motor_pin() {
    //rotate resulting pin around to desired rotation around Z
    rotate([0, 0, pin_r]) {
        translate([0, 0, motor_h]) {
            //hollow motor base inner diameter out of block making up pin
            difference() {
                //intersection of cylinder sitting on top of motor base, and a cube of the pin width
                intersection() {
                    cylinder(r=motor_d/2 + motor_t, h=pin_h);

                    translate([-(motor_d/2 + motor_t), -pin_w/2, 0])
                        cube([motor_d/2 + motor_t, pin_w, pin_h]);
                }

                //inner motor cylinder
                cylinder(r=motor_d/2, h=pin_h);
            }
        }
    }
}

//cut out the motor clip cutout, so that the base will expand to clip around motor body
// leave a thin web of material at the base (optional), to allow reaming out hole to precise
// desired diameter with a drill bit (so clip isn't expanding as trying to ream hole out),
// then manually cut the thin web out with a knife
module motor_clip_cut() {
    rotate([0, 0, cut_r])
        translate([motor_d/2 - motor_t/3, -cut_w/2, cut_b])
            cube([motor_t * 3, cut_w, motor_h]);

}

//version of OpenSCAD used to create this doesn't support rotate_extrude in a limited arc
// - only does full 360 degree extrusion - so need to remove the unused rear portion of the
// outer guard - just blocking it out a bit at a time (1 degree increments), then this resulting block will be diff'd out
module remove_back_guard() {
    block_deg_step = 1;
    partial_block_w = 2 * arm_l * sin(block_deg_step);   //block width needed to cover a 1 degree increment

        for(a=[-arm_a/2:-block_deg_step:-180]) {
            rotate([0, 0, a])                                                                  //rotate to arm angle
                translate([0, -(arm_base_w/2 + partial_block_w) , 0])                          //move so adjacent to base of arm
                    rotate([0, 0, -sign(arm_a) * atan(( guard_w/2 - arm_base_w/2)/arm_l)])     //rotate rectangle to make parallel to side of arm (taking into account angle of side of arm due to diff in arm_base_w and guard_w)
                        translate([arm_l - (guard_w + fillet_r), 0, 0])                        //move it out to the guard
                            cube([2*guard_w + fillet_r, partial_block_w, guard_h*2]);          //thin rectangle along X axis - make long enough to potentailly cover from very rear of guard to very front of guard
        }

        for(a=[arm_a/2:block_deg_step:180]) {
            rotate([0, 0, a])                                                                  //rotate to arm angle
                translate([0, arm_base_w/2, 0])                                                //move so adjacent to base of arm
                    rotate([0, 0, sign(arm_a) * atan(( guard_w/2 - arm_base_w/2)/arm_l)])      //rotate rectangle to make parallel to side of arm (taking into account angle of side of arm due to diff in arm_base_w and guard_w)
                        translate([arm_l - (guard_w + fillet_r), 0, 0])                        //move it out to the guard
                            cube([2*guard_w + fillet_r + arm_l, partial_block_w, guard_h*2]);  //thin rectangle along X axis - make long enough to potentailly cover from very rear of guard to very front of guard
        }

}

//this is the awesome ClothBotCreations fillet utility, distributed under the GNU General Public License
// see: https://github.com/clothbot/ClothBotCreations/blob/master/utilities/fillet.scad
// vvvvvvv start of ClothBotCreations fillet utililty vvvvvvv

module fillet(r=1.0,steps=3,include=true) {
  if(include) for (k=[0:$children-1]) {
	children(k);
  }
  for (i=[0:$children-2] ) {
    for(j=[i+1:$children-1] ) {
	fillet_two(r=r,steps=steps) {
	  children(i);
	  children(j);
	  intersection() {
		children(i);
		children(j);
	  }
	}
    }
  }
}

module fillet_two(r=1.0,steps=3) {
  for(step=[1:steps]) {
	hull() {
	  render() intersection() {
		children(0);
		offset_3d(r=r*step/steps) children(2);
	  }
	  render() intersection() {
		children(1);
		offset_3d(r=r*(steps-step+1)/steps) children(2);
	  }
	}
  }
}

module offset_3d(r=1.0) {
  for(k=[0:$children-1]) minkowski() {
	children(k);
	sphere(r=r,$fn=8);
  }
}

//actually generate the prop guard
prop_guard();
```


[User]
I'm looking for an OpenSCAD design for a USB stick case, but I need it to be fully parametric. I'd like to be able to specify the dimensions of the PCB and the USB port itself, as well as the depth and width of the notches on the sides of the PCB. The design should consist of two parts: a base and a lid, which snap together. I'd like to be able to specify the overall length of the case (that is, the length of the PCB plus the length of the protruding USB port) along with the length of the PCB itself, along with the distance from the front of the side notches to the end of the USB port.

The case should have two slots on the inside to hold the USB stick's PCB. The design should also include a cutout for the USB port, of the proper dimensions. The lid needs to snap fit into the base and should be relatively flush with the base once closed. For added flair, I want to include the capacity of the USB drive (e.g. "4GB") printed on the bottom, and the text size should be a variable.

I also want to be able to adjust the tolerance for the fit, and adjust the thicknesses of the walls. I'm not too picky about the method for snapping the base and lid together - a simple tongue-and-groove or similar approach would work.

It would be ideal if you could provide me with an OpenSCAD file (or two if necessary) that incorporates these parameters so I can easily customize it for different USB drives. I'm thinking something that can be printed relatively quickly, but is still functional. No special libraries are required for this, I believe; simple built-in functions will suffice.

[Assistant]
USB_stick_case.scad:
```
notchDepth = 1.2; //Depth of slots on the side of the PCB
notchWidth = 1.2; //Width of slots on the side of the PCB
portLength = 23.4; //Distance between the front of the slot to the end of the USB port
boardLength = 23.4; //Dsitance from the rear of the slot to the back of the board
boardWidth = 14.7; // Width from one side of the board to the other, you may want to add some tolerance
capacity = "4GB"; //The capacity of the drive to be written on the bottom
textSize = 10; // If you have a very large or small drive you can change the text size (default = 6)

USBLength = 12.2; // The required length of protruding port (should remain constant)
USBHeight = 4.6; // The height of a USB port (should remain constant)
USBWidth = 12.7; // The width of a USB port (should remain constant)

unitLength = boardLength+notchWidth+(portLength-USBLength)+2;
difference(){
    translate([0, 0, -0.5])
        cube([boardWidth+2, unitLength,1], center=true);
    translate([0,0,-0.6])
        rotate([180,0,90])
            linear_extrude(height = 0.5)
                text(text = capacity, font = "Liberation Sans:style=Bold", size = textSize, valign = "center", halign = "center");
}
translate([0, (unitLength-1)/-2, ((USBHeight+2)/2)-1])
    cube([boardWidth+2, 1, USBHeight+2], center=true);
difference(){
    translate([0, (unitLength-1)/2, ((USBHeight+2)/2)-1])
        cube([boardWidth+2, 1, USBHeight+2], center=true);
    translate([0, (unitLength-1)/2, ((USBHeight+2)/2)+0.1])
        cube([USBWidth, 1.1, USBHeight+0.1], center=true);
}
translate([(boardWidth/2)+0.5, 0, ((USBHeight+2)/2)-1])
    cube([1, unitLength, USBHeight+2],center = true);
translate([-(boardWidth/2)-0.5, 0, ((USBHeight+2)/2)-1])
    cube([1, unitLength, USBHeight+2],center = true);
translate([(boardWidth/2)-0.5, ((unitLength-1)/2)-(portLength-USBLength), ((USBHeight)/2)])
    cube([notchDepth-(notchDepth*0.3), notchWidth-(notchWidth*0.3), USBHeight], center = true);
translate([(boardWidth/-2)+0.5, ((unitLength-1)/2)-(portLength-USBLength), ((USBHeight)/2)])
    cube([notchDepth-(notchDepth*0.3), notchWidth-(notchWidth*0.3), USBHeight], center = true);
```
USB_stick_case_lid.scad:
```
notchWidth = 1.2; //Width of slots on the side of the PCB
portLength = 23.4; //Distance between the front of the slot to the end of the USB port
boardLength = 23.4; //Dsitance from the rear of the slot to the back of the board
boardWidth = 14.7; // Width from one side of the board to the other
capacity = "4GB"; //The capacity of the drive to be written on the bottom
textSize = 10; // If you have a very large or small drive you can change the text size (default = 6)

USBLength = 12.2; // The required length of protruding port (should remain constant)
USBWidth = 12.7; // The width of a USB port (should remain constant)

unitLength = boardLength+notchWidth+(portLength-USBLength)+2;
difference(){
    translate([0, 0, -0.5])
        cube([boardWidth+2, unitLength,1], center=true);
    translate([0,0,-0.6])
        rotate([180,0,90])
            linear_extrude(height = 0.5)
                text(text = capacity, font = "Liberation Sans:style=Bold", size = textSize, valign = "center", halign = "center");
}
difference(){
    translate([0, -0.5, 0.5])
        cube([boardWidth-0.4, unitLength-3.2,1], center = true);
    translate([0, 1, 0.5])
        cube([boardWidth-2.4, unitLength-2,1.1], center = true);
}
```


[User]
I'm looking to create a custom segmented track for my wooden train set, something similar to the "wacky track" toys. I'd like to be able to control the number of segments and the type of connectors on each end (male or female). I'd also like it to include a brim for printing stability.

I see there's an existing OpenSCAD design that does this already, but it relies on external libraries, which is a bit of a hassle. Can you create a new parametric OpenSCAD file (or files if necessary) that achieves this, without relying on those libraries? I'm comfortable with the basic OpenSCAD syntax and understand that I'll need to define the dimensions myself.

Specifically, I need the following parameters:

*   `left_connector`:  A dropdown selection of "male" or "female" for the connector on the left end of the track.
*   `right_connector`: A dropdown selection of "male" or "female" for the connector on the right end of the track.
*   `num_segments`: An integer to define the number of segments in the track.

The track itself should be based on standard wooden train track dimensions. The connection mechanism should also replicate the standard wooden train track pins and holes.  The "segments" should be joined with a "hinge-like" mechanism. It would also be helpful to generate a brim around the track to prevent peeling during printing. I don't need a curved option.

[Assistant]
track-segmented.scad:
```
/**
 * Parametric module to create a piece of segmented track for Thomas- and
 * Brio-compatible wooden train sets.  This is similar in play value to the
 * branded "wacky track" or "crazy track".  This includes its own brim to hold
 * the shape together while printing.  The included STL file matches size and
 * general curvature to standard "large curve" wooden tracks.

 * Advanced users can use parameters to customize the number of segments and
 * track appearance, but Thingiverse Customizer can't load the external
 * dependencies and the default values are the only ones that have been tested.
 *
 * To render this shape in OpenSCAD, you will need
 * [tracklib.scad](https://github.com/dotscad/trains) and
 * [dotscad](https://github.com/dotscad/dotscad).  See install instructions in
 * each of their github repositories.
 *
 * This OpenSCAD library is part of the [dotscad](https://github.com/dotscad/dotscad)
 * project, an open collection of modules and Things for 3d printing.  Please
 * check there for the latest versions of this and other related files.
 *
 * @copyright  Chris Petersen, 2016
 * @license    http://creativecommons.org/licenses/LGPL/2.1/
 * @license    http://creativecommons.org/licenses/by-sa/3.0/
 *
 * @see        http://www.thingiverse.com/thing:1897766
 * @source     https://github.com/dotscad/trains/blob/master/track-wooden/track-segmented.scad
 */

/* ******************************************************************************
 * Thingiverse Customizer parameters and rendering.
 * Unfortunately, Customizer doesn't support multiple .scad files so this won't work.
 * ****************************************************************************** */

/* [parameters] */

// Connector to place on the "left" end of the piece.
left = "male"; // [male,female]

// Connector to place on the "right" end of the piece.
right = "female"; // [male,female]

// Number of segments to render (9 matches a "large curve" wooden track).
segments = 9;

/* [Hidden] */

// A global overlap variable (to prevent printing glitches)
$o = .001;

// Lots of facets
$fn=25;

// A bunch of variables that I'd rather not be changed...

pad = .5; // extra to account for the bevel on the track edge
ring_buffer = 2;
ring_width = 6;
ring_length = 10 + ring_buffer;
ring_wall = 2.5;
hole_radius = (ring_length - 2*ring_wall)/2;
cutout_length = ring_length - ring_buffer + pad;
cutout_width1 = ring_width + pad;
cutout_width2 = cutout_width1 + 3;

pin_fudge = 1/cos(180/8); // see: https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/undersized_circular_objects
pin_r = 2*pin_fudge;

// Render the part
render_track(segments, left, right);

/* ******************************************************************************
 * Main module code below:
 * ****************************************************************************** */

// Import tracklib from globally-installed copy
use <tracklib.scad>;
use <dotscad/on_arc.scad>;
use <dotscad/pie.scad>;

module track_chain_segment(length=20, ring=true, pin=true) {

    // inside bevels of the pin cutout
    hole_edge_r = pin_fudge*(cutout_length/2);

    translate([0,-wood_width()/2, 0]) union() {
        difference() {
            wood_track(length);
            // Link pin cutout
            if (pin) {
                translate([length-cutout_length+$o,wood_width()/2 - ring_width/2, -$o]) {
                    hull() {
                        cube([$o,cutout_width1,wood_height()+2*$o]);
                        translate([cutout_length,ring_width/2-cutout_width2/2,0]) cube([$o,cutout_width2,wood_height()+2*$o]);
                    }
                }
            }
        }
        // Link ring
        if (ring) {
            translate([-ring_length,wood_width()/2 - ring_width/2, 0]) difference() {
                cube([ring_length+1,ring_width,wood_height()]); // pad 1 to account for the track's bevel edge
                hull() {
                    translate([hole_radius+ring_wall,ring_width+$o,hole_radius+ring_wall]) rotate([90,45/2,0]) cylinder(r=hole_radius, h=ring_width+2*$o, $fn=8);
                    translate([hole_radius+ring_wall,ring_width+$o,wood_height()-hole_radius-ring_wall]) rotate([90,45/2,0]) cylinder(r=hole_radius, h=ring_width+2*$o, $fn=8);
                    translate([ring_length-ring_buffer-hole_radius/pin_fudge-$o,ring_width+$o,wood_height()-hole_radius-ring_wall]) rotate([90,45/2,0]) cylinder(r=hole_radius, h=ring_width+2*$o, $fn=8);
                    translate([ring_length-ring_buffer-hole_radius/pin_fudge-$o,ring_width+$o,hole_radius+ring_wall]) rotate([90,45/2,0]) cylinder(r=hole_radius, h=ring_width+2*$o, $fn=8);
                }
                // TODO: bevel
                translate([-$o,ring_width/2,4+wood_height()]) rotate([0,45,0]) cube([ring_length,ring_width+2*$o,ring_length], center=true);
                translate([-$o,ring_width/2,-4]) rotate([0,45,0]) cube([ring_length,ring_width+2*$o,ring_length], center=true);
            }
        }
        // Link pin
        if (pin) {
            translate([length-pin_r/pin_fudge,wood_width()-$o, wood_height()/2]) {
                rotate([90,45/2,0]) cylinder(r=pin_r, h=wood_width()-2*$o, $fn=8);
            }
            translate([length-cutout_length-$o,wood_width()/2 - cutout_width2/2, 0])
                difference() {
                    cube([ring_buffer*2+$o,cutout_width2,wood_height()]);
                    translate([-ring_buffer+1,-$o,wood_height()/2]) rotate([0,45,0]) cube([wood_height(),cutout_width2+2*$o,wood_height()]);
                }
        }
     }
}

module left_segment(connector,segment_length) {
    if (connector == "female") {
        segment_left_pad = max(0, 32-segment_length);
        translate([-segment_left_pad,0,0]) difference() {
            track_chain_segment(segment_length+segment_left_pad, ring=false);
            translate([0,0,0]) wood_cutout();
        }
    } else {
        union() {
            track_chain_segment(segment_length, ring=false);
            rotate([0,0,180]) wood_plug();
        }
    }
}

module right_segment(connector,segment_length) {
    if (connector == "female") {
        segment_right_pad = max(0, 24-segment_length);
        difference() {
            track_chain_segment(segment_length+segment_right_pad, pin=false);
            translate([segment_length+segment_right_pad,0,0]) rotate([0,0,180]) wood_cutout();
        }
    } else {
        union() {
            track_chain_segment(segment_length, pin=false);
            translate([segment_length,0,0]) wood_plug();
        }
    }
}

/*
 * @param string left              Connector to place on the "left" end of the piece.
 * @param string right             Connector to place on the "right" end of the piece.
 * @param int    segnents          Number of track segments to render
 */
module render_track(segments, left, right) {
    // TODO: calculate some info based on segments
    segment_length = 14; // up to 20

    segment_left_pad = (left == "female") ? max(0, 32-segment_length) : 0;

    offset = segment_length+2.5;

    // Rotation angle, and radius that we'll need to move around
    a = 8;
    rad = (segment_length/2+ring_buffer) / sin(a/2);

    // Render the parts along an arc.
    // Note: no real point to do this because 12 segments is the same size
    //       straight or curved, and past that you need a print bed >24cm.
    arc = false;

    chain_segments = segments - 2;
    union() {
        // Left segment
        if (arc) {
            on_arc(rad, 0) rotate([0,0,-90])
                left_segment(left,segment_length);
        }
        else {
            left_segment(left,segment_length);
        }
        // Center chain links
        if (chain_segments > 0) {
            for (i = [1:chain_segments]) {
                if (arc) {
                    on_arc(rad, -a*i) rotate([0,0,-90]) track_chain_segment(segment_length);
                } else {
                    translate([segment_left_pad+i*(offset),0,0]) track_chain_segment(segment_length);
                }
            }
        }
        // Right segment
        if (arc) {
            on_arc(rad, -a*(chain_segments+1)) rotate([0,0,-90])
                right_segment(right, segment_length);
        } else {
            translate([segment_left_pad+(segments-1)*(offset),0,0])
                right_segment(right, segment_length);
        }
        // anti-peeling brim
        if (arc) {
            // See note about printing on an arc.  Wasn't worth continuing the
            // math to make this fit.  If you enable this, you're on your own
            // for a brim
            // translate([rad,0,0]) {
            //     union() {
            //         difference() {
            //             cylinder(r=rad+wood_width()/2-1, h=.2, $fn=100);
            //             translate([0,0,-$o]) cylinder(r=rad+wood_width()/2-3, h=1, $fn=100);
            //         }
            //         difference() {
            //             cylinder(r=rad+1, h=.2, $fn=100);
            //             translate([0,0,-$o]) cylinder(r=rad-1, h=1, $fn=100);
            //         }
            //         difference() {
            //             cylinder(r=rad-wood_width()/2+3.5, h=.2, $fn=100);
            //             translate([0,0,-$o]) cylinder(r=rad-wood_width()/2+1.5, h=1, $fn=100);
            //         }
            //     }
            // }
        } else {
            translate([3,-1,0]) cube([(offset)*(segments-1),2,.2]);
            translate([-5,wood_width()/2-2-.5*sqrt(2),0]) cube([(offset)*(segments+1),2,.2]);
            translate([-5,-wood_width()/2+.5*sqrt(2),0]) cube([(offset)*(segments+1),2,.2]);
        }
    }
}

```


[User]
Hi, I'd like a custom key designed with my name on it. I want to be able to adjust the length of the key, and also the letter height, but I'd like it to default to adjusting the length based on the length of the name. Also, I'd like to be able to select if the letters have support structures, and also change their width. I'd also like some options for the ring at the end, where I can change the size and also the shape of it.

More specifically, I'd like a parametric OpenSCAD design, or set of designs, that can do the following:

*   **Name:**  The design should take a text input which will be the name on the key. This should be able to accommodate the following characters:
    *   English letters (upper and lower case).
    *   Numbers (0-9).
    *   Hebrew letters (with variant selection for some letters).
    *   Special characters: `/`, `\`, `+`, `=`, `-`, `.`, `$`, `&`, `<`, `>`, `[`, `]`, `{`, `}`, `(`, `)`, `#` and space. Note: The backslash character, `\`,  will need to be entered doubled (`\\`).
*   **Key Length/Letter Height:** There should be a parameter `fixedLength` which is a boolean. If true, then the length of the key will be determined by a `length` parameter. If false, the height of the letters will be determined by a `letterHeight` parameter, and the key length will dynamically adjust to accommodate the text. The default should be `fixedLength = true`.
*   **Scaling:** There should be a scaling parameter to adjust the overall size of the key; this should scale everything proportionately.
*   **Minimum Blank Space:** There should be an adjustable parameter called `minBlankSpace` that controls the blank space between each letter, in multiples of the line width. This should default to 10.
*   **Minimum Width Ratio:** There should be a parameter called `minWidthRatio` that dictates the ratio between the diameter and the length of the key. The default should be 10.
*   **Ring:** The design needs a ring on the end of the key.
    *   There should be a parameter `ringSize` to control its diameter in multiples of the barrel diameter (default to 3).
    *   There should be a parameter `ringScale` to control the scale of the ring (default to 0.75).
    *   There should be a parameter `ringType` that selects whether the ring is a circle or a heart (defaulting to circle).
*   **Support Structures:**
    *   A boolean `support` parameter will turn support structures on or off for letters that have floating parts. It should be on by default.
    *   A `supportWidth` parameter will control the width of the support structures. The default should be 3.
*   **Text Direction:**  A `textDirection` parameter to flip the key for languages written right to left (like Hebrew). The default value should be 0 (for left to right).
*   **Dual Extrusion:** The customizer should be able to output 3 files. One file with the full key, one with just the key blank, and a final file with just the name. A `part` parameter (with values 0 for Full Key, 1 for Key Blank, and 2 for Name) will control which parts are rendered. The default should be 0.
*   **Character Variants:**
    *   There should be options for character variants for the following letters, using parameters like `nVariant` (with default 1), `zayinVariant` (with default 1), and `ayinVariant` (with default 1).
*   **Hidden Parameters:**
    *   A `lineSize` parameter controls the width of lines. It should default to 0.2.
    *   A `$fn` variable controls the resolution of circles, with default 50.

I think that covers it. Let me know if you need any clarifications. Thanks!

[Assistant]
key-nospecial.scad:
```
name = "Your Name Here";
/* [Basic] */
// This determines whether the key has a fixed length or a fixed letter height.
fixedLength = true; // [true,false]
// This scales EVERYTHING proportionately (and may appear to do nothing). NOTE: This will only have an effect if Fixed Length is true.
length = 100; // [1:1000]
// NOTE: This will only have an effect if Fixed Length is false.
letterHeight = 10; // [1:100]
/* [Advanced] */
// This is a multiple of the line width.
minBlankSpace = 10; // [0:100]
// This is the ratio between the diameter and the length of the key. Lower this to allow for a stubbier key with a shorter name.
minWidthRatio = 10; // [2:20]
// This is a multiple of the barrel diameter.
ringSize = 3; // [2:10]
ringScale = 0.75; // [0.5:0.125:1.5]
// Please note that the heart is pretty buggy and may not work if you adjust ring size
ringType = 0; // [0:circle,1:heart]
// For characters with floating parts
support = true; // [true,false]
supportWidth = 3; // [1:0.5:5]
// this will flip the key for languages written RTL (Hebrew)
textDirection = 0; // [0:left to right,1:right to left]
// The customizer will generate all 3 as seperate files. Use the separate key & name for dual extrusion.
part = 0; // [0:Full Key,1:Key Blank,2:Name]
/* [Character Variants] */
nVariant = 1; // [1:2]
zayinVariant = 1; // [1:2]
ayinVariant = 1; // [1:3]
/* [Hidden] */
// preview[view:south,tilt:top]
lineSize = 0.2;
unit = fixedLength ? min(length / minWidthRatio, length / (pos() + (minBlankSpace * lineSize) + ringSize - lineSize)) : letterHeight; // base unit of measurement - calculated if total length is fixed, otherwise set directly
keyLength = fixedLength ? length : max(letterHeight * minWidthRatio, letterHeight * (pos() + (minBlankSpace * lineSize) + ringSize - lineSize));  // calculated if fixed not set to true above
line = unit * lineSize;
$vpt = [keyLength / (textDirection == 0 ? 2 : -2), 0, 0]; // center
$vpd = 100; // zoom
$vpr = [0,0,0]; // show flat
$fn = 50; // resolution
rotate([0, textDirection * 180, 0]){
  if(part < 2){
    keyBlank();
  }
  if(len(name) > 0 && part % 2 == 0){
    word();
  }
}
module word(){
  for(i = [0:len(name) - 1]){
    translate([unit * pos(i),0,unit / -2]){
      if(support){
        supportLetter(name[i]);
      }
      linear_extrude(unit){
        scale([line,line]){
          letter(name[i]);
        }
      }
    }
  }
}
{function pos(n) = ( // position function
  n == undef ? pos(len(name)) : n == 0 || n > len(name) ? 0 :
    name[n - 1] == "I" ||
    name[n - 1] == "i" ||
    name[n - 1] == "." ? pos(n - 1) + lineSize * 2 : // 1 line-width letters above this line
    name[n - 1] == "[" ||
    name[n - 1] == "]" ||
    name[n - 1] == "י" || // (yud)
    name[n - 1] == "ו" || // (vav)
    name[n - 1] == "ן" || // (nun sofit)
    name[n - 1] == "(" ||
    name[n - 1] == ")" ? pos(n - 1) + lineSize * 3 : // 2 line-width letters above this line
    name[n - 1] == "1" ||
    name[n - 1] == " " ||
    name[n - 1] == "נ" || // (nun)
    name[n - 1] == "ג" || // (gimmel)
    name[n - 1] == "ז" || // (zayin)
    name[n - 1] == "{" ||
    name[n - 1] == "}" ? pos(n - 1) + lineSize * 4 : // 3 line-width letters above this line
    name[n - 1] == "<" ||
    name[n - 1] == ">" ? pos(n - 1) + lineSize * (3.5+sqrt(0.5)) : // 2.5+sqrt(0.5) line-width letters above this line
  pos(n - 1) + lineSize * 6
);}
module letter(char){
    if     (char == "A" || char == "a"){
      polygon([[0,0],[0,5],[5,5],[5,0],[4,0],[4,2],[1,2],[1,0],[1,3],[1,4],[4,4],[4,3]],paths = [[0,1,2,3,4,5,6,7],[8,9,10,11]]);
    }
    else if(char == "B" || char == "b"){
      polygon([[0,0],[0,5],[5,5],[5,0],[1,3],[1,4],[4,4],[4,3],[1,1],[1,2],[4,2],[4,1]],paths = [[0,1,2,3],[4,5,6,7],[8,9,10,11]]);
    }
    else if(char == "C" || char == "c"){
      polygon([[0,0],[0,5],[5,5],[5,4],[1,4],[1,1],[5,1],[5,0]]);
    }
    else if(char == "D" || char == "d"){
      polygon([[0,0],[0,5],[4,5],[5,4],[5,1],[4,0],[1,1],[1,4],[4,4],[4,1]],paths = [[0,1,2,3,4,5],[6,7,8,9]]);
    }
    else if(char == "E" || char == "e"){
      polygon([[0,0],[0,5],[5,5],[5,1 *4],[1,4],[1,3],[3,3],[3,2],[1,2],[1,1],[5,1],[5,0]]);
    }
    else if(char == "F" || char == "f"){
      polygon([[0,0],[0,5],[5,5],[5,1 *4],[1,4],[1,3],[3,3],[3,2],[1,2],[1,0]]);
    }
    else if(char == "G" || char == "g"){
      polygon([[0,0],[0,5],[5,5],[5,1 *4],[1,4],[1,1],[4,1],[4,2],[2,2],[2,3],[5,3],[5,0]]);
    }
    else if(char == "H" || char == "h"){ // did you know that the name of this letter in English is aitch?
      polygon([[0,0],[0,5],[1,5],[1,3],[4,3],[4,5],[5,5],[5,0],[4,0],[4,2],[1,2],[1,0]]);
    }
    else if(char == "I" || char == "i"){
      polygon([[0,0],[0,5],[1,5],[1,0]]);
    }
    else if(char == "J" || char == "j"){
      polygon([[0,0],[0,2],[1,2],[1,1],[4,1],[4,5],[5,5],[5,0]]);
    }
    else if(char == "K" || char == "k"){
      polygon([[0,0],[0,5],[1,5],[1,3],[(3 - sqrt(0.5)),3],[(5 - sqrt(0.5)),5],[5,5],[5,(5 - sqrt(0.5))],[(2.5 + sqrt(0.5)),2.5],[5,sqrt(0.5)],[5,0],[(5 - sqrt(0.5)),0],[(3 - sqrt(0.5)),2],[1,2],[1,0]]);
    }
    else if(char == "L" || char == "l"){
      polygon([[0,0],[0,5],[1,5],[1,1],[5,1],[5,0]]);
    }
    else if(char == "M" || char == "m"){
      polygon([[0,0],[0,5],[5,5],[5,0],[4,0],[4,4],[3,4],[3,0],[2,0],[2,4],[1,4],[1,0]]);
    }
    else if(char == "N" || char == "n"){
      if(nVariant == 1) polygon([[0,0],[0,5],[1,5],[1,4+sqrt(0.5)],[4,1+sqrt(0.5)],[4,5],[5,5],[5,0],[4,0],[4,1-sqrt(0.5)],[1,4-sqrt(0.5)],[1,0]]);
      else polygon([[0,0],[0,5],[5,5],[5,0],[4,0],[4,4],[1,4],[1,0]]);
    }
    else if(char == "O" || char == "o"){
      polygon([[0,0],[0,5],[5,5],[5,0],[1,1],[1,4],[4,4],[4,1]],paths = [[0,1,2,3],[4,5,6,7]]);
    }
    else if(char == "P" || char == "p"){
      polygon([[0,0],[0,5],[5,5],[5,2],[1,2],[1,0],[1,3],[1,4],[4,4],[4,3]],paths = [[0,1,2,3,4,5],[6,7,8,9]]);
    }
    else if(char == "Q" || char == "q"){
      polygon([[0,0],[0,5],[5,5],[5,0],[1,1],[1,4],[4,4],[4,(1 + sqrt(0.5))],[(2 + sqrt(0.5)),3],[2,3],[2,(3 - sqrt(0.5))],[(4 - sqrt(0.5)),1]],paths = [[0,1,2,3],[4,5,6,7,8,9,10,11]]);
    }
    else if(char == "R" || char == "r"){
      polygon([[0,0],[0,5],[5,5],[5,2],[(3 + sqrt(0.5)),2],[5,sqrt(0.5)],[5,0],[(5 - sqrt(0.5)),0],[(3 - sqrt(0.5)),2],[1,2],[1,0],[1,3],[1,4],[4,4],[4,3]],paths = [[0,1,2,3,4,5,6,7,8,9,10],[11,12,13,14]]);
    }
    else if(char == "S" || char == "s"){
      polygon([[0,0],[0,1],[4,1],[4,2],[0,2],[0,5],[5,5],[5,4],[1,4],[1,3],[5,3],[5,0]]);
    }
    else if(char == "T" || char == "t"){
      polygon([[0,4],[0,5],[5,5],[5,4],[3,4],[3,0],[2,0],[2,4]]);
    }
    else if(char == "U" || char == "u"){
      polygon([[0,0],[0,5],[1,5],[1,1],[4,1],[4,5],[5,5],[5,0]]);
    }
    else if(char == "V" || char == "v"){
      polygon([[0,2],[0,5],[1,5],[1,2.5],[2.5,1],[4,2.5],[4,5],[5,5],[5,2],[3,0],[2,0]]);
    }
    else if(char == "W" || char == "w"){
      polygon([[0,0],[0,5],[1,5],[1,1],[2,1],[2,4],[3,4],[3,1],[4,1],[4,5],[5,5],[5,0]]);
    }
    else if(char == "X" || char == "x"){
      polygon([[0,0],[0,sqrt(0.5)],[(2.5 - sqrt(0.5)),2.5],[0,(5 - sqrt(0.5))],[0,5],[sqrt(0.5),5],[2.5,(2.5 + sqrt(0.5))],[(5 - sqrt(0.5)),5],[5,5],[5,(5 - sqrt(0.5))],[(2.5 + sqrt(0.5)),2.5],[5,sqrt(0.5)],[5,0],[(5 - sqrt(0.5)),0],[2.5,(2.5 - sqrt(0.5))],[sqrt(0.5),0]]);
    }
    else if(char == "Y" || char == "y"){
      polygon([[0,2],[0,5],[1,5],[1,3],[4,3],[4,5],[5,5],[5,2],[3,2],[3,0],[2,0],[2,2]]);
    }
    else if(char == "Z" || char == "z"){
      polygon([[0,0],[0,1],[3.5,4],[0,4],[0,5],[5,5],[5,4],[1.5,1],[5,1],[5,0]]);
    }
    else if(char == "0"){
      polygon([[0,0],[0,5],[5,5],[5,0],[1,1],[1,4],[4,4],[4,1]],paths=[[0,1,2,3],[4,5,6,7]]);
    }
    else if(char == "1"){
      polygon([[0,0],[0,1],[1,1],[1,4],[0,4],[0,5],[2,5],[2,1],[3,1],[3,0]]);
    }
    else if(char == "2"){
      polygon([[0,0],[0,3],[4,3],[4,4],[0,4],[0,5],[5,5],[5,2],[1,2],[1,1],[5,1],[5,0]]);
    }
    else if(char == "3"){
      polygon([[0,0],[0,1],[4,1],[4,2],[1,2],[1,3],[4,3],[4,4],[0,4],[0,5],[5,5],[5,0]]);
    }
    else if(char == "4"){
      polygon([[0,2],[0,5],[1,5],[1,3],[4,3],[4,5],[5,5],[5,0],[4,0],[4,2]]);
    }
    else if(char == "5"){
      polygon([[0,0],[0,1],[4,1],[4,2],[0,2],[0,5],[5,5],[5,4],[1,4],[1,3],[5,3],[5,0]]);
    }
    else if(char == "6"){
      polygon([[0,0],[0,5],[5,5],[5,4],[1,4],[1,3],[5,3],[5,0],[1,1],[1,2],[4,2],[4,1]],paths = [[0,1,2,3,4,5,6,7],[8,9,10,11]]);
    }
    else if(char == "7"){
      polygon([[0,4],[0,5],[5,5],[5,0],[4,0],[4,4]]);
    }
    else if(char == "8"){
      polygon([[0,0],[0,5],[5,5],[5,0],[1,3],[1,4],[4,4],[4,3],[1,1],[1,2],[4,2],[4,1]],paths = [[0,1,2,3],[4,5,6,7],[8,9,10,11]]);
    }
    else if(char == "9"){
      polygon([[0,0],[0,1],[4,1],[4,2],[0,2],[0,5],[5,5],[5,0],[1,3],[1,4],[4,4],[4,3]],paths = [[0,1,2,3,4,5,6,7],[8,9,10,11]]);
    }
    else if(char == "/"){
      polygon([[0,0],[0,sqrt(0.5)],[(5 - sqrt(0.5)),5],[5,5],[5,(5 - sqrt(0.5))],[sqrt(0.5),0]]);
    }
    else if(char == "\\"){ // may need to be escaped in customizer
      polygon([[0,(5 - sqrt(0.5))],[0,5],[sqrt(0.5),5],[5,sqrt(0.5)],[5,0],[(5 - sqrt(0.5)),0]]);
    }
    else if(char == "+"){
      polygon([[0,2],[0,3],[2,3],[2,5],[3,5],[3,3],[5,3],[5,2],[3,2],[3,0],[2,0],[2,2]]);
    }
    else if(char == "-"){
      polygon([[0,2],[0,3],[5,3],[5,2]]);
    }
    else if(char == "="){
      polygon([[0,1],[0,2],[5,2],[5,1]]);
      polygon([[0,3],[0,4],[5,4],[5,3]]);
    }
    else if(char == "#"){ // octothorpe is a fun word
      polygon([[0,1],[0,2],[1,2],[1,3],[0,3],[0,4],[1,4],[1,5],[2,5],[2,4],[3,4],[3,5],[4,5],[4,4],[5,4],[5,3],[4,3],[4,2],[5,2],[5,1],[4,1],[4,0],[3,0],[3,1],[2,1],[2,0],[1,0],[1,1],[2,2],[2,3],[3,3],[3,2]],paths = [[0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27],[28,29,30,31]]);
    }
    else if(char == "<"){
      polygon([[0,2.5],[2.5,5],[2.5+sqrt(0.5),5],[2.5+sqrt(0.5),5-sqrt(0.5)],[sqrt(2),2.5],[2.5+sqrt(0.5),sqrt(0.5)],[2.5+sqrt(0.5),0],[2.5,0]]);
    }
    else if(char == ">"){
      polygon([[0,0],[0,sqrt(0.5)],[2.5-sqrt(0.5),2.5],[0,5-sqrt(0.5)],[0,5],[sqrt(0.5),5],[2.5+sqrt(0.5),2.5],[sqrt(0.5),0]]);
    }
    else if(char == "["){
      polygon([[0,0],[0,5],[2,5],[2,4],[1,4],[1,1],[2,1],[2,0]]);
    }
    else if(char == "]"){
      polygon([[0,0],[0,1],[1,1],[1,4],[0,4],[0,5],[2,5],[2,0]]);
    }
    else if(char == "{"){
      polygon([[0,2],[0,3],[1,3],[1,5],[3,5],[3,4],[2,4],[2,1],[3,1],[3,0],[1,0],[1,2]]);
    }
    else if(char == "}"){
      polygon([[0,0],[0,1],[1,1],[1,4],[0,4],[0,5],[2,5],[2,3],[3,3],[3,2],[2,2],[2,0]]);
    }
    else if(char == "("){
      polygon([[0,sqrt(0.5)],[0,(5 - sqrt(0.5))],[sqrt(0.5),5],[2,5],[2,4],[1,4],[1,1],[2,1],[2,0],[sqrt(0.5),0]]);
    }
    else if(char == ")"){
      polygon([[0,0],[0,1],[1,1],[1,4],[0,4],[0,5],[(2 - sqrt(0.5)),5],[2,(5 - sqrt(0.5))],[2,sqrt(0.5)],[(2 - sqrt(0.5)),0]]);
    }
    else if(char == "."){ // period
      polygon([[0,0],[0,1],[1,1],[1,0]]);
    }
    else if(char == "$"){
      polygon([[0,0.5],[0,1.5],[4,1.5],[4,2],[0,2],[0,4.5],[2,4.5],[2,5],[3,5],[3,4.5],[5,4.5],[5,3.5],[1,3.5],[1,3],[5,3],[5,0.5],[3,0.5],[3,0],[2,0],[2,0.5]]);
    }
    else if(char == "&"){ // ampersand
      polygon([[0,0],[0,5],[3,5],[3,3],[5,3],[5,2],[(3 + sqrt(0.5)),2],[5,sqrt(0.5)],[5,0],[(5 - sqrt(0.5)),0],[3,(2 - sqrt(0.5))],[3,0],[1,3],[1,4],[2,4],[2,3],[1,1],[1,2],[2,2],[2,1]],paths = [[0,1,2,3,4,5,6,7,8,9,10,11],[12,13,14,15],[16,17,18,19]]);
    }
    else if(char == " "){ // space
      // this space intentionally left blank
    }
    else echo(str("<b>Invalid character: ", char, "</b>"));
  }
module keyBlank(){
	translate([keyLength - unit * (ringSize / 2),0,0]){ // ring
		if (ringType == 0){
			rotate_extrude(){
				translate([(ringSize - ringScale) / 2 * unit,0,0]){
					scale([ringScale,1]){
						circle(d = unit);
					}
				}
			}
		}
		else if (ringType == 1){
			heart();
		}
	}
	rotate([0,90,0]){ // barrel
		difference(){
			if (ringType == 0){
				cylinder(d = unit,h = keyLength - (ringSize - ringScale / 2) * unit);
			}
			else if (ringType == 1){
				cylinder(d = unit,h = keyLength - (ringSize + 1 - ringScale / 2) * unit);
			}
			translate([unit / -2,0,0]){
				cube([unit,unit,unit * pos() - line]);
			}
    }
  }
}
module heart(){
	difference(){
		translate([0,(ringSize / 2 - ringScale) * unit,0]){
			rotate_extrude(){
				translate([(ringSize - ringScale) / 2 * unit,0,0]){
					scale([ringScale,1]){
						circle(d = unit);
					}
				}
			}
		}
		linear_extrude(unit,center = true){
			polygon([[0,0],[unit * ringSize / 2,0],[unit * ringSize / 2,-unit * ringScale],[unit * ringSize / -2,-unit * ringScale],[unit * ringSize / -2,unit * (ringSize - ringScale)],[0,unit * (ringSize / 2 - ringScale)]]);
		}
	}
	difference(){
		translate([0,(ringSize / 2 - ringScale) * unit,0]){
			rotate([90,0,-45]){
				translate([unit * (ringSize - ringScale) / -2,0,0]){
					linear_extrude(unit * ringSize){
						scale([ringScale,1]){
							circle(d = unit);
						}
					}
				}
			}
		}
		translate([unit * ringSize * -1.2,unit * ringSize * -1,unit / -2]){
			cube([unit * ringSize,unit * ringSize,unit]);
		}
	}

	rotate([180,0,0]){
		difference(){
			translate([0,(ringSize / 2 - ringScale) * unit,0]){
				rotate_extrude(){
					translate([(ringSize - ringScale) / 2 * unit,0,0]){
						scale([ringScale,1]){
							circle(d = unit);
						}
					}
				}
			}
			linear_extrude(unit,center = true){
				polygon([[0,0],[unit * ringSize / 2,0],[unit * ringSize / 2,-unit * ringScale],[unit * ringSize / -2,-unit * ringScale],[unit * ringSize / -2,unit * (ringSize - ringScale)],[0,unit * (ringSize / 2 - ringScale)]]);
			}
		}
		difference(){
			translate([0,(ringSize / 2 - ringScale) * unit,0]){
				rotate([90,0,-45]){
					translate([unit * (ringSize - ringScale) / -2,0,0]){
						linear_extrude(unit * ringSize){
							scale([ringScale,1]){
								circle(d = unit);
							}
						}
					}
				}
			}
			translate([unit * ringSize * -1.2,unit * ringSize * -1,unit / -2]){
				cube([unit * ringSize,unit * ringSize,unit]);
			}
		}
	}
}
module supportLetter(letter){
  if     (letter == "-") support(2,2);
  else if(letter == "=") support(2,3);
}
module support(position, height){
  scale([line,line,line]){
    translate([position, 0, 2.5-(supportWidth/2)]){
      cube([1, height == undef ? 5 : height, supportWidth]);
    }
  }
}
```


[User]
I need a customizable ruler designed in OpenSCAD. It should be parametric so I can easily adjust its length, units, and various other aspects.

Here are the key features I'm looking for:

*   **Length:** The ruler length should be adjustable in a parameter, let's call it `RulerLength`. I want to be able to specify this in either centimeters or inches. The range should be from 1 to 50, and I want to input just the numerical length.
*   **Units:** A parameter called `Unit` should allow me to choose between "centimeters" and "inches".
*   **Hole:** I'd like an option for a hole at one end of the ruler using a `WithHole` parameter, with "yes" or "no" options.
*   **Reverse Design:** A `ReverseDesign` parameter, also "yes" or "no", to flip the ruler design so the markings are at the top instead of the bottom.
*  **Shrinkage Compensation:** I need a parameter called `ShrinkageCompensationFactor` that I can use to scale the whole design, to account for material shrinkage during printing. The default should be 1.0.
*   **Text Label:** I need a `RulerText` parameter for a text label on the ruler, along with a `FontSize` parameter. I should also be able to choose if the text is bold or not via `BoldFont`, and if the font is narrow via `NarrowFont`, both with "yes" or "no" options. `TextHeight` allows to change how the text is rendered and `TextX` and `TextY` will change its position.
*   **Numbers:** The ruler should have numbers alongside the major unit markings. I want to be able to adjust their size using the `NumberSize` parameter and boldness using the `BoldNumbers` parameter ("yes" or "no"). There should also be a `NumberHeight` parameter to control whether numbers are embossed or recessed and a `NumberOffset` to control its position.
*   **Ruler Lines:** A `UnitsLineWidth` parameter should control the width of the main unit lines and `SubdivisionsGapWidth` will change the gap between each subdivision.
*   **Font:**  I'd like to use "Roboto" as a default font, but when "NarrowFont" is set to "yes", "Roboto Condensed" should be used instead. The numbers should always use "Roboto Condensed". The bold version of the chosen fonts should also be used, when specified.
* **Additional Notes:**
    * The subdivision lines should be recessed to improve printability, not just drawn on the surface.
    * The text and numbers should be embossed when `TextHeight` and `NumberHeight` are positive and recessed when these are negative. When the `TextHeight` or `NumberHeight` parameter is 0, text or numbers should not be rendered.
    * When `ReverseDesign` is "yes", the numbers, text, and hole should also be flipped around.

I think that should cover it. Let me know if you have any questions. I look forward to seeing the result!

[Assistant]
iRuler_v2.scad:
```
//customizable ruler by Stu121
//Updated by DrLex
//2017-04-21: v2: added inches option

/* [General] */
RulerLength=10;//[1:50]
Unit="centimeters";//[centimeters, inches]
WithHole="yes";//[yes, no]
ReverseDesign="no";//[yes, no]
ShrinkageCompensationFactor=1.0;

/* [Text] */
RulerText="iRuler";
FontSize=10;
BoldFont="no";//[yes, no]
NarrowFont="no";//[yes, no]
TextHeight=1;//[-2.6:.1:5]
TextX=3;
TextY=18;

/* [Numbers] */
NumberSize=7;//[1:15]
BoldNumbers="no";//[yes, no]
NumberHeight=.5;//[-2.6:.1:5]
NumberOffset=2;//[0:.5:4]

/* [Ruler lines] */
UnitsLineWidth=.5;//[.3:.05:.7]
SubdivisionsGapWidth=.3;//[.2:.05:.5]

/* [Hidden] */
UnitText = Unit == "inches" ? "IN" : "CM";
UnitSize = Unit == "inches" ? 25.4 : 10;
Font= NarrowFont == "no" ? "Roboto" : "Roboto Condensed";
Font2="Roboto Condensed";
Hole=(WithHole == "yes");
Inverted=(ReverseDesign == "yes");
TextFont = BoldFont == "no" ? Font : str(Font, ":style=Bold");
NumberFont = BoldNumbers == "no" ? Font2 : str(Font2, ":style=Bold");

module numbers() {
    Thickness=abs(NumberHeight) + (NumberHeight < 0 ? 0.1 : 0);
    ZPos=NumberHeight >= 0 ? 2.5 : 2.5+NumberHeight;
    Rot=Inverted ? [0,0,180] : [0,0,0];
    RotCenter=[RulerLength*UnitSize/2+5,5.5+NumberSize/2,0];
    translate(RotCenter) rotate(Rot) {
        for (i=[1:1:RulerLength]) {
            NumberOffsetActual=(i > 9) ? NumberOffset-2.5 : NumberOffset;
            translate([(i*UnitSize)+NumberOffsetActual,5.5,ZPos]-RotCenter) linear_extrude(Thickness)  text(str(i),NumberSize,font=NumberFont,$fn=24);
        }
        translate([1,5.5,ZPos]-RotCenter) linear_extrude(Thickness)  text(UnitText,5,font=NumberFont,$fn=24);
    }
}

module label() {
    Thickness=abs(TextHeight) + (TextHeight < 0 ? 0.1 : 0);
    ZPos=TextHeight >= 0 ? 2.5 : 2.5+TextHeight;
    Rot=Inverted ? [0,0,180] : [0,0,0];
    RotCenter=[RulerLength*UnitSize/2+5,TextY-1.5+FontSize/2,0];
    translate(RotCenter) rotate(Rot) {
        translate([TextX,TextY,ZPos]-RotCenter) linear_extrude(Thickness)  text(RulerText,FontSize,font=TextFont,$fn=24);
    }
}

scale(ShrinkageCompensationFactor) difference() {
    union() {
        hull() {
            translate([0,5,0]) cube([(RulerLength*UnitSize)+10,25,2.5]);
            translate([0,-5,0])  cube([(RulerLength*UnitSize)+10,1,1]);
        }

        for (i=[0:1:RulerLength]) {  //unit lines
            translate([i*UnitSize+5-UnitsLineWidth/2,-4.9,0.6]) rotate([8.5,0,0]) cube([UnitsLineWidth,10,.7]);
        }

        if(NumberHeight > 0) {
            numbers();
        }
        if (TextHeight > 0) {
            label();
        }
    }

    //Subdivision lines. These are recessed to improve printability with thicker nozzles.
    if(Unit == "centimeters") {
        for (i=[1:RulerLength*10]) {
            if(i % 10) {
                GapLength=(i % 5) ? 5 : 6.5;
                translate([i+5-SubdivisionsGapWidth/2,-4.95,0.5]) rotate([8.5,0,0]) cube([SubdivisionsGapWidth,GapLength,.7]);
            }
        }
    }
    else {
        for (i=[0:RulerLength-1]) {
            translate([(i+0.5)*UnitSize+5-SubdivisionsGapWidth/2,-4.95,0.5]) rotate([8.5,0,0]) cube([SubdivisionsGapWidth,8,.7]);
            for (j=[0:1]) {
                translate([(i+0.25+j*0.5)*UnitSize+5-SubdivisionsGapWidth/2,-4.95,0.5]) rotate([8.5,0,0]) cube([SubdivisionsGapWidth,6,.7]);
            }
            for (j=[0:3]) {
                translate([(i+0.125+j*0.25)*UnitSize+5-SubdivisionsGapWidth/2,-4.95,0.5]) rotate([8.5,0,0]) cube([SubdivisionsGapWidth,4.25,.7]);
            }
            for (j=[0:7]) {
                translate([(i+0.0625+j*0.125)*UnitSize+5-SubdivisionsGapWidth/2,-4.95,0.5]) rotate([8.5,0,0]) cube([SubdivisionsGapWidth,2.5,.7]);
            }
        }
    }
    if (TextHeight < 0) {
        label();
    }
    if (NumberHeight < 0) {
        numbers();
    }
    if (Hole) {
        HoleX = Inverted ? 10 : RulerLength*UnitSize;
        translate([HoleX,18,2])  cylinder(10, 2.5, 2.5, true);
    }
}

```


[User]
Okay, I'm looking to create a Turkish spindle for spinning yarn, and I'd like a parametric OpenSCAD design. I'm thinking of a design with two crossbars, one smaller than the other, that fit onto a stick. I'd like to be able to adjust the size of the stick, the length and width of the crossbars, and the curvature of the arms. The design I'm thinking of is very similar to the one in the attached file.

Specifically, I'd like the following parameters to be adjustable:

*   **`side_count`**: This should control the number of sides for the stick. It should allow for a cylindrical hole (when set to a high number) or a polygon hole for the stick.
*   **`stick_diameter`**: The diameter of the stick, measured corner-to-corner.
*   **`arm_length`**: The length of each arm of the crossbars.
*   **`arm_width`**: The width of the arms. This should be greater than the `stick_diameter` to avoid interference.
*  **`radius_factor`**: This should control how curved the arms are, where a higher number results in a straighter arm.
* **`bevel`**: The size of the bevel to be applied to edges.

The design has two crossbars:

*   **Small Crossbar**: This will have a hole that fits the stick and a smaller thickness.
*   **Big Crossbar**: This one will be thicker and have a hole through which the entire small crossbar (and stick) passes, with an additional hole for the stick.

The small crossbar should be placed at the top, rotating 90 degrees about the x axis. The big crossbar should be placed below the small one in the same orientation.

I think that covers it. I am not interested in using the existing functions or modules, I want all-new code. I'm hoping you can generate the OpenSCAD files based on these requirements.

[Assistant]
turkish_spindle-craigv1.scad:
```
// Number of sides your stick has
side_count =4;

// This is in mm, and must be measured at the largest diameter (corner-to-corner, not edge-to-edge).  My chopsticks are 5.5mm, pencils are 8mm.
stick_diameter = 10.2;

// Length in mm
arm_length = 120;

// Width in mm - make sure it's greater than your stick's diameter!
arm_width = 18;

// Controls curvature of arms - higher numbers yield less curve.
radius_factor = .9;

/* [Hidden] */
bevel = 3;
width = arm_width;
$fa = .5; // resolution: 3/3 is good for design, maybe use 0.5/0.5 for printing
$fs = .5;

module round_stick() {
  length = 200;
  dia = stick_diameter;  // 5.5 seems to work for chopstick, trying 8 for pencil

  cylinder(h=length, r=dia/2, $fn=side_count); // $fn=6 gives hexagonal hole for pencil
}

module crossbar(width, thickness, bevel) {
  function loop_drop(arm_length=arm_length, radius_factor=radius_factor) = -cos(asin((arm_length/2)/(arm_length*radius_factor)))*arm_length*radius_factor; // calculates how far to lower the loop

  module loop() { // this module draws the big loop
    translate([-width/2, 0, loop_drop(arm_length, radius_factor)])
      rotate([0, 90, 0])
        rotate_extrude(angle=360, convexity=10, $fs=3, $fa=3)
          translate([bevel/2+radius_factor*arm_length-thickness/2, bevel/2, 0])
            minkowski() {
              square([thickness-bevel, width-bevel]);
              circle(r=bevel/2);
            }
  }

  intersection() { // cuts the segment of the loop that we want
    loop();
    translate([-arm_length, -arm_length/2, 0]) cube([arm_length*2, arm_length, arm_length*2]);
  }

  intersection() { // makes the rounded ends
    loop();
    for (i=[1,-1])
      translate([0, i*arm_length/2, thickness/3.6])
        rotate([0, 90, 0])
          cylinder(h=width+2, r=thickness/3.6, center=true);
  }
}

module little_crossbar(template=false) { // set template true if using it to make a hole
  thickness = 6;
  clearance = .6;

  if (template==true) {
    crossbar(width=width+clearance, thickness=thickness+clearance, bevel=bevel);
  }
  else {
    difference() {
      crossbar(width=width, thickness=thickness, bevel=bevel);
      round_stick();
    }
  }
}

module big_crossbar() {
  difference() {
    crossbar(width=width, thickness=12, bevel=bevel);
    rotate([0,0,90]) little_crossbar(template=true);
    rotate([0,0,90]) round_stick(); // rotated to match other spindle in case the stick lacks 90* rotational symmetry
  }
}

translate([25, 0, width/2]) rotate([0, 90, 0]) // rotating may eliminate need for supports
  little_crossbar();
translate([0, 0, width/2]) rotate([0, 90, 0])
  big_crossbar();

```


[User]
Hi! I'm looking to get some OpenSCAD files designed for rubber feet, kind of like the ones I see online, but I want some specific customizations and a few different designs. I've seen some using the `build_plate` function, so I'd like to use something similar here.

For the first file, I want to be able to adjust the diameter and the height of a simple cylindrical foot.  I'd like a variable for `diameter` with a range of 6 to 100 and a variable for `height`. Make the default diameter 30 and default height 3. I'd like a build plate included for scale - is there a standard library function that might work? I think I saw something about `build_plate` somewhere using some parameters for different printers that looked helpful.

The second file will be for the control box of my Wanhao Duplicator i3 printer. I want to make some custom feet for that since it can be a bit wobbly.  I'd like four feet, each with a hollowed-out circular base for stability - I'm thinking like a wide, squat donut. I need parameters for the outer diameter, inner diameter (of the hollow center), and the height of the feet. The feet should also have a small "stub" on the bottom that will insert into the bottom of the control box - say, a short cylinder, around half the diameter of the central hollow, and maybe a third of the height of the foot.  I want to be able to adjust the size and position of the insertion stub. The stub should have a slight taper, maybe like a 2-degree taper.

For this second file, I'd like to be able to specify the spacing of the four feet. This should work for the Wanhao Duplicator i3, but I should also be able to adjust it for other control boxes if necessary.

Oh, and in both files, could you make sure the build plate for scale is included using the `build_plate` function with parameters for the printer and the manual position? Also, are there any standard libraries that would be helpful here?

[Assistant]
Customizable_Feet.scad:
```
//Customizable "Rubber Feet"
//(Best in a flexible filament)

include <utils/build_plate.scad>

//Customizable Variables
diameter = 30; // [6:100]
height = 3;

//Cylinder
cylinder (r=0.5*diameter, h=height);

//Build plate for scale
build_plate(build_plate_selector,build_plate_manual_x,build_plate_manual_y);

```


[User]
Hi there, I'm looking for a way to generate some custom inserts for pipette tip boxes, and I'd like to use OpenSCAD to design them. Basically, I want to create trays that will hold different sizes of tubes – 1.5 mL, 0.5 mL, and PCR tubes – and I'd like to have a script that lets me adjust the number and arrangement of tubes easily, as well as the overall size of the tray.

I'm hoping for a parametric design that lets me do a few different things:

1.  **Adjust tube spacing:** The tubes should have a little bit of extra space around their diameter, so that they fit easily. I'd like to be able to specify an inflation percentage for the diameter.  The horizontal and vertical spacing should also be adjustable, and might be different for each type of tube.
2.  **Specify grid layouts:** I want to control how many rows and columns of tubes there are.
3.  **Customize tray dimensions:** I need to be able to set the tray's length, width, and thickness, as well as the radius of the corners (which are rounded). There should also be an adjustable margin on the edges of the tray.
4. **Create cutouts**: I need to include a rectangular cutout on either side of the tray; I want to be able to control the size and corner radius of those, too.
5. **Multiple hole types:** I want to be able to make trays with just one type of tube, but I also want to be able to mix them. Ideally I'd like to have a single script that can generate all of the types of racks I mentioned above (mixed, 1.5mL, 0.5mL, PCR). I don't need to have them all in a single rack.

I don't know the best way to implement this, but I'm thinking that I could use modules for things like a "makeHoleGrid" function and "roundedBox" (like in the example code I have). It would be amazing if you could generate the code for me, including the function for the rounded box. I'd like to avoid using external libraries if possible.

I've included the relevant parameters that I've been using in the example code I have below to help you.
```
// Misc

IDexpand = 12; // Percent inflation to make sure that the tubes fit in their holes.
fn = 80;

// Tray dimensions (mm)
trayLength = 118;
trayWidth = 80;
trayHeight = 0.6;
trayRadius = 3;

// Tray margin
trayMargin = 6; // Unused space around the edges of the tray. This is in addition to the reserved space around each tube.

// Tray cut-out
hasCutouts = true; // The pipette box has protrusions at the top and bottom.
cutoutLength = 41;
cutoutWidth = 3;
cutoutRadius = 1;

// Tray working space
availLength = trayLength - (trayMargin * 2);
availWidth = trayWidth - (trayMargin * 2);

// Tube dimensions
// Spacings were worked out by using Meshmixer's packing algorithm to arranged 9 tube models into a compact square with 1 mm borders.

// 1500 uL
d1500 = 10.67 * (IDexpand / 100 + 1);
//11.20 at 5% expansion
// Actually printed as 10.50, which is 0.0625 % smaller.
// So should expansion be 12 % (0.0625 + 0.0500)?
spacing1500x = 16.25;
spacing1500y = 17.30;

// 500 uL
d500 = 7.60 * (IDexpand / 100 + 1);
spacing500x = 13.00;
spacing500y = 13.00;

// 200 uL (PCR)
d200 = 6.43 * (IDexpand / 100 + 1); // SSI tubes are 6.35 OD and Varistrips are 6.50 OD. http://4ti.co.uk/pcr/vari-strips-vari-plates/vari-strips
spacing200x = 9.00; // Standard for 200 uL PCR tubes.
spacing200y = 9.00;

// Misc
cutterHeight = trayHeight * 2; // Cutters in OpenSCAD must extend past the faces they're cutting.
cutterOffset = trayHeight / 2; // Center the cutter to ensure top/bottom faces are both cut.
```

Thanks!

[Assistant]
Thaw-box.scad:
```
// Misc

IDexpand = 12; // Percent inflation to make sure that the tubes fit in their holes.
fn = 80;

// Tray dimensions (mm)
trayLength = 118;
trayWidth = 80;
trayHeight = 0.6;
trayRadius = 3;

// Tray margin
trayMargin = 6; // Unused space around the edges of the tray. This is in addition to the reserved space around each tube.

// Tray cut-out
hasCutouts = true; // The pipette box has protrusions at the top and bottom.
cutoutLength = 41;
cutoutWidth = 3;
cutoutRadius = 1;

// Tray working space
availLength = trayLength - (trayMargin * 2);
availWidth = trayWidth - (trayMargin * 2);

// Tube dimensions
// Spacings were worked out by using Meshmixer's packing algorithm to arranged 9 tube models into a compact square with 1 mm borders.

// 1500 uL
d1500 = 10.67 * (IDexpand / 100 + 1);
//11.20 at 5% expansion
// Actually printed as 10.50, which is 0.0625 % smaller.
// So should expansion be 12 % (0.0625 + 0.0500)?
spacing1500x = 16.25;
spacing1500y = 17.30;

// 500 uL
d500 = 7.60 * (IDexpand / 100 + 1);
spacing500x = 13.00;
spacing500y = 13.00;

// 200 uL (PCR)
d200 = 6.43 * (IDexpand / 100 + 1); // SSI tubes are 6.35 OD and Varistrips are 6.50 OD. http://4ti.co.uk/pcr/vari-strips-vari-plates/vari-strips
spacing200x = 9.00; // Standard for 200 uL PCR tubes.
spacing200y = 9.00;

// Misc
cutterHeight = trayHeight * 2; // Cutters in OpenSCAD must extend past the faces they're cutting.
cutterOffset = trayHeight / 2; // Center the cutter to ensure top/bottom faces are both cut.

// =================================================

difference()
{
  // Make the basic tray shape and center it in the world.
  translate([0, 0, trayHeight/2])
  roundedBox([trayLength, trayWidth, trayHeight], trayRadius, true, $fn=fn);

  // Make the tray cutouts.
  translate([0, trayWidth/2, cutterOffset])
  roundedBox([cutoutLength, cutoutWidth * 2, cutterHeight], cutoutRadius, true, $fn=fn);

  translate([0, -trayWidth/2, cutterOffset])
  roundedBox([cutoutLength, cutoutWidth * 2, cutterHeight], cutoutRadius, true, $fn=fn);

// ===== Single-type racks==============================================================

//  makeHoleGrid(numX = 6, numY = 4, tubeDiam = d1500, spacingX = spacing1500x, spacingY = spacing1500y);
//
//  makeHoleGrid(numX = 8, numY = 5, tubeDiam = d500, spacingX = spacing500x, spacingY = spacing500y);
//
//    makeHoleGrid(numX = 12, numY = 8, tubeDiam = d200, spacingX = spacing200x, spacingY = spacing200y);

// ===== Mixed size PCR reagent box ====================================================

  translate([-trayWidth/2,0,0])
  makeHoleGrid(numX = 2, numY = 4, tubeDiam = d1500, spacingX = spacing1500x, spacingY = spacing1500y);

  translate([spacing1500x,spacing500x+1.5,0])
  makeHoleGrid(numX = 6, numY = 3, tubeDiam = d500, spacingX = spacing500x, spacingY = spacing500y);

  translate([spacing1500x-1.5, -spacing200x*2.25])
  makeHoleGrid(numX = 8, numY = 3, tubeDiam = d200, spacingX = spacing200x, spacingY = spacing200y);
}

module makeHoleGrid(numX, numY, tubeDiam, spacingX, spacingY, height = cutterHeight, offset = cutterOffset) {
  xCenter = ((numX - 1) * spacingX) / 2;
  yCenter = ((numY - 1) * spacingY) / 2;

  translate([-xCenter, -yCenter, -cutterOffset])

  union() {
    for (i = [0 : numX - 1]) {
      for (j = [0 : numY - 1]) {
        translate([spacingX * i, spacingY * j, 0])
        color("Blue")
          cylinder(d = tubeDiam, h = height, $fn = fn);
      }
    }
  }
}

// ==================================================================================

// Library: boxes.scad
// Version: 1.0
// Author: Marius Kintel
// Copyright: 2010
// License: 2-clause BSD License (http://opensource.org/licenses/BSD-2-Clause)

// roundedBox([width, height, depth], float radius, bool sidesonly);

// EXAMPLE USAGE:
// roundedBox([20, 30, 40], 5, true);

// size is a vector [w, h, d]
module roundedBox(size, radius, sidesonly)
{
  rot = [ [0,0,0], [90,0,90], [90,90,0] ];
  if (sidesonly) {
    cube(size - [2*radius,0,0], true);
    cube(size - [0,2*radius,0], true);
    for (x = [radius-size[0]/2, -radius+size[0]/2],
           y = [radius-size[1]/2, -radius+size[1]/2]) {
      translate([x,y,0]) cylinder(r=radius, h=size[2], center=true);
    }
  }
  else {
    cube([size[0], size[1]-radius*2, size[2]-radius*2], center=true);
    cube([size[0]-radius*2, size[1], size[2]-radius*2], center=true);
    cube([size[0]-radius*2, size[1]-radius*2, size[2]], center=true);

    for (axis = [0:2]) {
      for (x = [radius-size[axis]/2, -radius+size[axis]/2],
             y = [radius-size[(axis+1)%3]/2, -radius+size[(axis+1)%3]/2]) {
        rotate(rot[axis])
          translate([x,y,0])
          cylinder(h=size[(axis+2)%3]-2*radius, r=radius, center=true);
      }
    }
    for (x = [radius-size[0]/2, -radius+size[0]/2],
           y = [radius-size[1]/2, -radius+size[1]/2],
           z = [radius-size[2]/2, -radius+size[2]/2]) {
      translate([x,y,z]) sphere(radius);
    }
  }
}
```


[User]
Hey, I'm looking for help creating a customizable multiplication table in OpenSCAD. I've got some experience with it, but I'm thinking this might be a bit complex to do from scratch.

Here's what I'm envisioning:

I'd like a 3D printed plate with the multiplication table on it. I want to be able to specify the range of rows and columns. So, I could set it up to show from 2x2 to 9x9, or any other range I want within 1 to 20, for example.

For the layout, I'd like some control over the plate's size and margins. The plate thickness, of course, needs to be configurable, where 0 gives no plate at all. There should also be a space (margin) between the edges of the plate and the numbers. I would like to be able to set the thickness of the numbers.

I would like each number to be a 3D extruded text object. I'd like to choose the font size of the text for all numbers and would also like the option to have the thickness of the numbers be proportional to their value.

I also need an option to set the plate's X and Y dimensions when a manual plate selector is chosen. It will not always be necessary to use the full build plate of my printer.

There should be a visual column separator line that separates the column with the row numbers from the rest of the table.

I'm hoping you can generate the OpenSCAD files for me. I don't need any specific libraries other than the build_plate library used to size the plate. I want the code to be clear and easy to follow.

[Assistant]
Times_Table_v1.5.scad:
```
/*
*****************************************************

By Jordi Caparrós
jordicaparros@gmail.com
2016

v1.3:     calculate row & col positions with a col. vector
v1.4:     Separate limits for rows and columns & variable height text
v1.5:     Thingiverse Customizer version

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

// Customizer helper code
include <utils/build_plate.scad>;

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

//CUSTOMIZER VARIABLES

/* [Plate Size] */

// Number where rows start counting
first_row_number = 2; // [1:20]

// Number where rows end counting
last_row_number = 9; // [1:20]

// Number where Columns start counting
first_column_number = 2; // [1:20]
// Number where Columns end counting
last_column_number = 9;  // [1:20]

// Plate thickness ( 0 = no plate ! )
plate_thickness = 2;  // [0:0.5:10]

/* [Numbers Settings] */

// Number's Font size
font_size=6; // [5:20]

// Number's default thickness (3D height)
numbers_thickness = 1;  // [0.5:0.5:10]

// Set >0 to get Variable Height Numbers (Proportional to value)
variable_numbers_thicknessbers = 0; // [0:0.5:5]

/* [General Layout] */

// White space (margins) from plate border to numbers
intend = 3; // [1:10]

//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]

//CUSTOMIZER VARIABLES END

/* [Hidden] */
cells_sep_x = 2*1 ;     // X_inter-cell-space
cells_sep_y = 5*1;        // Y_inter-cell-space

$fn=15;
build_plate_selector = 3;
plate_op = "X";
line_size=3;

total_num_row = last_row_number - first_row_number + 1;
total_num_col = last_column_number - first_column_number + 1;
num_z_adjust = plate_thickness - 0.2;

// Modules

module write_num(num) {

    snum = str(num);
    linear_extrude(height = numbers_thickness + ( num / 10 ) * variable_numbers_thicknessbers , center = false)
        text(snum, font = "Comic Sans:style=Bold Italic", size=font_size);

}   // moudule write_num

module write_text(texto) {

    linear_extrude(height = numbers_thickness , center = false)
        text(texto, font = "Comic Sans:style=Bold Italic", size=font_size);

}   // moudule write_text

// Helper functions to Calculate x,y number positions

function  x_pos(columna) = ( columna <= first_column_number -1 ) ?

        // First Column

            intend   :

        // Non First Columns

            ( columna == first_column_number ) ?   // Second col ?

                       cells_sep_x + len ( str (last_row_number))*font_size
                        +  x_pos(columna - 1)

                    :  // Column 3 to end
                        len ( str ((columna-1)*
                        last_row_number))*font_size +  x_pos(columna - 1);

function  y_pos(fila) = ( intend + (total_num_row - (fila - first_row_number  + 1 )) * ( font_size + cells_sep_y ));

// MAIN PLATE SIZE CALCULATION
plate_size_x = x_pos(last_column_number + 1)  - cells_sep_x;
plate_size_y = intend+(total_num_row+1)*(font_size+cells_sep_y);

build_plate(build_plate_selector,build_plate_manual_x,build_plate_manual_y);

union() {
    cube([plate_size_x,plate_size_y,plate_thickness],center=false);

    // HEADER: Operation symbol operator + First Row numbers

    translate([x_pos(first_column_number-1),y_pos(first_row_number-1),num_z_adjust])
                write_text(plate_op);

    for (head =[first_column_number:last_column_number])
        translate([x_pos(head),y_pos(first_row_number-1),num_z_adjust])
            write_num(head);

    // TABLE BODY (second row to last_row_number row)

    for (row =[first_row_number:last_row_number]) {

        translate([x_pos(first_column_number-1),y_pos(row),num_z_adjust])
                write_num(row);

        for (col = [first_column_number:last_column_number]) {

            translate([x_pos(col),y_pos(row),num_z_adjust])
                write_num(row*col);
        }
    }

    // COLUMN SEPARATOR

    translate( [x_pos(first_column_number)- cells_sep_x ,intend,num_z_adjust+0.5] )
        rotate ([270,0,0])
            linear_extrude(height = (y_pos(first_row_number-1)+cells_sep_y )) resize([line_size-1,line_size/3]) circle(d=3);

}

```