[User]
Hi, I'm looking to design a new effector for my delta 3D printer, specifically for a hotend from reprap.cc. I've been using the `effector_benny_reprap_cc_customizer_v12.scad` file but it's not fully parametric and I'd like something more flexible. It also has some magic numbers.

Essentially, I need an effector that can mount the reprap.cc Bowden hotends which use a similar mounting style to the MendelMax. They are held in place with three flat M3 nuts and three M3 screws. I have included the dimensions of a few things that I need modeled in the code:

**Hotend:**
The hotend has a cylindrical body, and its radius should be a parameter that I can specify (`hotend_rad`). Additionally, the height of the hotend holder part should also be adjustable (`hholder_height`).

**Mounting:**
The effector needs three arms extending outwards at 120-degree angles to connect to the carriage rods.  Each arm will have a mounting section with a place for a ball joint or some other connection. The distance between the mounting faces of these ball joints should be a parameter called `separation`, and the offset of the hotend mounting in the center relative to the ball joint mounts should be a parameter called `offset`.

The mount for the hotend needs to have three M3 flat nut slots placed around the base at 120-degree angles. These slots should accommodate the flat M3 nuts, and have some buffer room to make sure they fit well. The cutouts for the M3 screws should extend out on the side of the hotend mount. The depth should be a variable as well, `m3_flachmutter`.  The distance from the center of the hotend mount to the center of an M3 nut should be a variable too, `m3_loch_b`. The screws themselves should be countersunk, or have the appropriate cutouts for screw heads.

**Other:**
There are some additional variables used for the mounting hardware which should be parameters as well (like nut radii and screw radii), to make sure the holes fit appropriately. You can use a `buffer` variable for any of the parts that need an extra bit of tolerance. I can use a variable `extra_radius` to handle minor overages. There's a `thickness` for the mounts, which right now is just a hard coded value. The mounting screw radius should be a parameter as well (currently `mount_radius`). And finally there's `push_fit_height` which is the length of the brass fitting.

I would like to generate this with a parametric design. Could you generate the OpenSCAD files needed for this? I'd prefer to not use a library if possible, but if it is necessary to accomplish a parametric design feel free to use it.

[Assistant]
effector_benny_reprap_cc_customizer_v12.scad:
```

// Kossel Effector
// based on http://www.thingiverse.com/thing:218402/#files
// Update by nischelwitzer@gmail.com

  //////////////////////////
 // Customizer Settings: //
//////////////////////////

// How big is the hotend radius?
hotend_rad   = 5;  // [3:10]

// How height should the hotend holder be?
hholder_height = 20; // [14:30]

  //////////////////////
 // Static Settings: //
//////////////////////

module GoAwayCustomizer() {
// This module is here to stop Customizer from picking up the variables below
}

// ---------------------------------------------------
// NIS Hotend Data

hotend_radius   = hotend_rad + 0.17;  // 0.17mm buffer

height = 9;
hholder_border = 7.0;

m5_hole    = 5.0;
m3_hole    = 3.0+0.3;
m3_loch_b  = 5.75;
m3_flachmutter = 2.0+0.4; // dicke
buffer     = 0.3;

// ---------------------------------------------------

// ---------------------------

// include <configuration.scad>;

// Increase this if your slicer or printer make holes too tight.
extra_radius = 0.1;

// OD = outside diameter, corner to corner.
m3_nut_od = 6.1;
m3_nut_radius = m3_nut_od/2 + 0.2 + extra_radius;
m3_washer_radius = 3.5 + extra_radius;

// Major diameter of metric 3mm thread.
m3_major = 2.85;
m3_radius = m3_major/2 + extra_radius;
m3_wide_radius = m3_major/2 + extra_radius + 0.2;

// NEMA17 stepper motors.
motor_shaft_diameter = 5;
motor_shaft_radius = motor_shaft_diameter/2 + extra_radius;

// Frame brackets. M3x8mm screws work best with 3.6 mm brackets.
thickness = 3.6;

// OpenBeam or Misumi. Currently only 15x15 mm, but there is a plan
// to make models more parametric and allow 20x20 mm in the future.
extrusion = 15;

// Placement for the NEMA17 stepper motors.
motor_offset = 44;
motor_length = 47;

// ----------------------------

separation      = 40;  // Distance between ball joint mounting faces.
offset          = 20;  // Same as DELTA_EFFECTOR_OFFSET in Marlin.

mount_radius    = 12.5;  // Hotend mounting screws, standard would be 25mm

push_fit_height = 7.5;  // Length of brass threaded into printed plastic.

cone_r1 = 2.5;
cone_r2 = 14;

module effector() {

  difference() {
    union() {

      color("blue") cylinder(r=offset-3, h=height, center=true, $fn=60);

      // NIS Benny Holder
      color("lightblue") cylinder(r=hotend_radius+hholder_border, h=hholder_height, center=false, $fn=60);

      for (a = [60:120:359]) rotate([0, 0, a]) {

	rotate([0, 0, 30]) translate([offset-2, 0, 0])
	  color("green") cube([10, 13, height], center=true);

	for (s = [-1, 1]) scale([s, 1, 1]) {
	  translate([0, offset, 0]) difference() {
	    intersection() {
	      color("red") cube([separation, 40, height], center=true);
	      translate([0, -4, 0]) rotate([0, 90, 0])
		cylinder(r=10, h=separation, center=true);
	      translate([separation/2-7, 0, 0]) rotate([0, 90, 0])
		cylinder(r1=cone_r2, r2=cone_r1, h=14, center=true, $fn=24);
	    }
	    rotate([0, 90, 0])
	      cylinder(r=m3_radius, h=separation+1, center=true, $fn=12);
	    rotate([90, 0, 90])
	      cylinder(r=m3_nut_radius, h=separation-24, center=true, $fn=6);
	  }

        }
      }
    }

    // cutter
    translate([0, 0, -height*2])
      cylinder(r=hotend_radius, h=height*10, $fn=36);

  // m3 cuts
  translate([0,0,hholder_height-11]) rotate([0,0,-30]) schrauben_cut();
  translate([0,0,hholder_height-11]) rotate([0,0,-30+120]) schrauben_cut();
  translate([0,0,hholder_height-11]) rotate([0,0,-30-120]) schrauben_cut();

  }

}

// ############################################################
// ############################################################

translate([0, 0, height/2]) effector();

// ############################################################
// ############################################################

module schrauben_cut()
{
  translate([2.5+hotend_radius,-m3_loch_b/2,2])
    cube([m3_flachmutter,m3_loch_b,20]);

  translate([0,0,6]) rotate([0,90,0])
    cylinder(20, r=(3+buffer)/2,$fn=100);
}

// ############################################################

```


[User]
I'm looking to create a customizable stone turret using OpenSCAD, and I've got a pretty specific idea in mind based on a design I saw. The main thing is that it should be built from blocks that are randomly rotated before being intersected with each other, sort of like real stone.

Here are the features I'm looking for:

**Base:**

*   **Block Generation:** The base of the turret should be made from layers of these intersecting "stone" blocks. Each block is created from the intersection of multiple rotated cubes. The number of intersections per block should be customizable.
*   **Randomness:** Each block has a slightly random rotation, and this should be controlled by a seed that the user can change. The rotations are around all three axes, and the amount of rotation decreases for each intersection.
*   **Block Shape:** Each block will essentially be a wedge, where the inner radius, radial width, angle, and height can be changed.
*   **Layering:** The blocks should be arranged in layers, and the user should be able to specify the number of layers, block height, and the vertical spacing between layers, to allow for some variation in the overall look.
*   **Rotation:** Each layer should be able to rotate slightly to add some randomness.
*   **Mortar:** There should be an option to add mortar between the layers and blocks, where the thickness of the mortar can be adjusted relative to the block thickness.
*   **Turret Radius:** There needs to be a parameter to control the overall internal radius of the turret.
*   **Curviness:** I want to be able to control the smoothness of the curves with the `$fn` variable.

**Top (Optional):**

*   **Crenelations:** The design should have an optional top part, where crenelations or "lookout stones" are added.
*   **Overhangs:** There should be an option to choose if the crenelations should be more difficult to print. In other words, avoid large overhangs.
*   **Lookout Stone Width:** The width of the crenelations should be adjustable, as a multiplier of the main blocks.

**General:**

*   **Color:** I want to be able to set a color for the stone and another for the mortar.
*   **Units:** The dimensions are expected to be in millimeters.

I'd really like the code to be written in a modular way, if possible. I'm thinking we could use modules for the wedge creation, layer creation, and the top of the turret.

I am not sure if this helps, but I do have some additional information for you regarding how the wedge module might look:

```
module wedge5(inner,width,theta,thickness,seed){
	//inner		=inner radius of arch/circle
	//width		=radial distance of block
	//theta		=angle subtended by block
	//thickness	=height of block
	random=rands(-1,1,n*3,seed);
	intersection(){
		wedge_boundary(inner,width,theta,thickness);
		correct(inner, width)	translate([inner+width/2,0,0])
			intersection_for(i=[0:n-1]){
				rotate([	max_angle*random[3*i]*pow(i*(thickness/inner),power),
							.7*max_angle*random[3*i+1]*pow(i,power),
							max_angle*random[3*i+2]*pow(i*(inner/width),power)])
					cube([width, sqrt((4*inner*tan(theta/2))*(width)), sqrt((4*inner*tan(theta/2))*(thickness))], center=true);
				}
		}
	}
```

I'm also not attached to the names of the variables as they appear in the existing code. Feel free to modify them to be more descriptive or consistent with established OpenSCAD coding practices.

Could you generate the necessary OpenSCAD file or files for me? I don't need any external libraries, just the standard OpenSCAD functionality.

[Assistant]
Turret_4.4.scad:
```
//Created by Ari M. Diacou, February 2014
//Shared under Creative Commons License: Attribution 3.0 Unported (CC BY-SA 3.0)
//see http://creativecommons.org/licenses/by-sa/3.0/

/* [Base] */
//A way to save your "random" arrangement
master_seed=13;
//Number of intersections forming a block
n=8;
//reduces the ablity of higher n to cut away all the block, I like -0.4.
power=-.4; //[-1,-0.9,-0.8,-0.7,-0.6,-0.5,-0.4,-0.3,-0.2,-0.1,0]
//Maximum angle of block intersections
max_angle=15;
//How many blocks form a circle?
blocks_per_rev=12;
//Number of layers of blocks in the turret base
height=6;
//The height of each block in mm
block_height=4;
//The radial width of a block in mm
block_thickness=10;
//The internal radius of the turret in mm
turret_radius=25;
//How much curviness do you want?
$fn=30;
//<1 Compresses layers, >1 expands them to show mortar
z_spacing=1.1;
//<1 Compresses layers, >1 expands them to show mortar
theta_expansion=1.0;
//Mortar thickeness divided by Block thickness, if you dont want, hit zero.
mortar_thickness=.4;

/* [Top] */
//Do you want a top?
care="yes";//[yes,no]
//Do 45 degree overhangs scare you?
noob="no";//[yes,no]
//How many blocks wide do you want the lookout stones?
factor=1.5;

/* [Hidden] */
stone="silver";
grout="ghostwhite";
rad=turret_radius;
num=blocks_per_rev;
union(){
	color(stone) base();
	if(mortar_thickness>.01){
		color(grout)
			mortar(turret_radius,mortar_thickness);
		}
	}
if (care=="yes") {crown();}

module crown(){
	phase=360/num*(ceil(factor)-factor)/1;
	if(noob=="no"){
		translate([2*rad+4*block_thickness,0,3*block_height]) union(){
			//The conical base
			translate([0,0,-3*block_height])
				color(stone) cylinder(2*block_height,turret_radius+block_thickness,turret_radius+2*block_thickness);
			//The middle stones
			for(i=[1:num]){
				rotate( i * 360 / num, [0,0,1])
					color(stone) wedge5(turret_radius+block_thickness,block_thickness,360/num,block_height, master_seed+i);
				}
			//The mortar
			if(mortar_thickness>.01){
				translate([0,0,-1*block_height])
					scale([1,1,1/(height*z_spacing)])
						color(grout) mortar(turret_radius+block_thickness,mortar_thickness);
				}
			//The crenelations
			for(i=[1:num/2]){
				//Crenelations
				translate([0,0,2*block_height])
					rotate( phase+i * 720 / num, [0,0,1])
						color(stone) wedge5(turret_radius+block_thickness,block_thickness,(360*factor)/num,block_height,master_seed+num+i);
				}
			}
		}
	if(noob=="yes"){
		translate([2*rad+4*block_thickness,0,1*block_height]) union(){
			//The middle stones
			for(i=[1:num]){
				rotate( i * 360 / num, [0,0,1])
					color(stone) wedge5(turret_radius+block_thickness,block_thickness,360/num,block_height, master_seed+i);
				}
			//The mortar
			translate([0,0,-1*block_height])
				scale([1,1,1/(height*z_spacing)])
					color(grout) mortar(turret_radius+block_thickness,mortar_thickness);
			//The crenelations
			for(i=[1:num/2]){
				//Crenelations
				translate([0,0,2*block_height])
					rotate( phase+i * 720 / num, [0,0,1])
						color(stone) wedge5(turret_radius+block_thickness,block_thickness,(360*factor)/num,block_height,master_seed+num+i);
				}
			}
		//The conical base
		translate([0,2*rad+4*block_thickness,0])
			color(stone) cylinder(2*block_height,turret_radius+2*block_thickness,turret_radius+block_thickness);
		}
	}

module base(){
	for(h=[0:height-1]){
		rotate([0,0,90*(pow(-1,h))/num])
			translate([0,0,(h+.5)*block_height*2*z_spacing])
				union(){
					for(i=[1:num]){
					   rotate( i * 360 / num, [0,0,1])
							wedge5(turret_radius,block_thickness,360*theta_expansion/num,block_height,master_seed+i+num*h);
						}
					}
		}
	}

module mortar(radius,thickness){
	//Makes a hollow cylinder in the middle of the bricks of the
	inner_radius=radius+(1-thickness)*block_thickness/2;
	outer_radius=thickness*block_thickness;
	//translate([0,0,-block_height])
	linear_extrude(height=2*height*block_height*(z_spacing)-height*(z_spacing-1)){
		difference(){
			circle(inner_radius+outer_radius);
			circle(inner_radius);
			}
		}
	}

module wedge5(inner,width,theta,thickness,seed){
	//inner		=inner radius of arch/circle
	//width		=radial distance of block
	//theta		=angle subtended by block
	//thickness	=height of block
	random=rands(-1,1,n*3,seed);
	intersection(){
		wedge_boundary(inner,width,theta,thickness);
		correct(inner, width)	translate([inner+width/2,0,0])
			intersection_for(i=[0:n-1]){
				rotate([	max_angle*random[3*i]*pow(i*(thickness/inner),power),
							.7*max_angle*random[3*i+1]*pow(i,power),
							max_angle*random[3*i+2]*pow(i*(inner/width),power)])
					cube([width, sqrt((4*inner*tan(theta/2))*(width)), sqrt((4*inner*tan(theta/2))*(thickness))], center=true);
				}
		}
	}

module correct(inner, width){
	//mirrors an object about its yz plane, which necessarily must be done is this ugly way
	translate([inner+width/2,0,0])
		mirror([1,0,0])
			translate([-inner-width/2,0,0])
				child(0);
	}

module wedge_boundary(inner,width,theta,thickness){
	//Creates a pie slice of theta degrees that has a radius of inner+width. Used to make sure that the wedge does not over-extend the angle it is supposed to.
	intersection(){
		rotate([0,0,-theta/2])
			translate([(inner+width)/2,(inner+width)/2,0])
				cube([inner+width,inner+width,2*thickness],center=true);
		rotate([0,0,theta/2])
			translate([(inner+width)/2,-(inner+width)/2,0])
				cube([inner+width,inner+width,2*thickness],center=true);
		}
	}
```


[User]
Hey, I'm looking to create a custom lid for a wine decanter and need some help designing it in OpenSCAD. I've got some basic dimensions in mind but want it to be fully parametric, so I can tweak things easily later.

Essentially, it's a conical lid with a cylindrical handle on top. The main body of the lid should be a frustum, wider at the bottom where it fits into the decanter and narrower at the top. I'd like the bottom edge of this frustum to be somewhat rounded. The handle should transition smoothly from a cylindrical base to a rounded top. Also, I'd like the option to have a small flat section at the bottom to improve print adhesion.

Here are the key parameters I'd like to control:

*   `smallDiameter`: The diameter of the top of the frustum.
*   `largeDiameter`: The diameter of the bottom of the frustum.
*   `lidHeight`: The height of the frustum.
*   `handleHeight`: The total height of the handle.
*   `cutoff`: The thickness of the flat section at the bottom (set to zero for no flat section).

I'd also want to make sure the handle transitions smoothly. Perhaps a couple of spheres scaled in z could be used to accomplish that.

Could you generate an OpenSCAD file that does all this, making use of the hull() operation to make sure all the shapes blend together nicely? Also, please use `$fa` to control the circle resolution in a parametric way as well.

[Assistant]
bouchon.scad:
```
// Small diameter of the lid
SD=30;

// Large diameter of the lid
LD=44;

// Height of the lid
LH=30;

// Height of the handle
HH=60;

// To help adhésion cut off the botton (replaces Cura similar option)
CUTOFF=1.5;

$fa=0.5;

intersection(){
	hull(){
		cylinder(r1=SD/2, r2=LD/2, h=LH);
		scale([1,1,0.3]) sphere(r=15);
	}
	translate([-50, -50, -4.5+CUTOFF]) cube([100, 100, 100]);
}

cylinder(r=8, h=LH+HH-27.5);

hull(){
   translate([0,0,LH+HH-27.5]) sphere(r=8);
	translate([0,0,LH+HH-7.5]) scale([1,1,0.6]) sphere(r=15);
}
```


[User]
I'm looking to create a parametric belt tensioner for a project, and I've seen a design that I like, but it's not as flexible as I need. Could you help me design a parametric OpenSCAD model?

The basic design is a bar with a sort of "S" shaped cutout on each side to guide the belt. There are also notches on the sides to help hold the belt.

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

*   **`tensionLength`**:  The overall length of the tensioner bar. I need to be able to adjust this between 20mm and 50mm.
*   **`tensionThick`**: The thickness of the tensioner bar. I'd like to set this between 2mm and 10mm.
*   **`beltWidth`**:  The width of the belt this is intended for, scaled by 1/10th. I should be able to set this between 30 and 100. So, a `beltWidth` of 65 means a belt width of 6.5mm.
*   **`notchDepth`**: The depth of the notches on the sides that help guide the belt, and this will vary between 1mm and 10mm.

I think that's everything. Let me know if you need any more information. I am not using any external libraries.

[Assistant]
belt_tensioner_v10.scad:
```

//
// source: http://www.thingiverse.com/thing:10082
// made for customizer
// alexander@nischelwitzer.com
//

  //////////////////////////
 // Customizer Settings: //
//////////////////////////

// How long should the belt-tension be? (mm)
tensionLength   = 25;  // [20:50]

// How thick should the tension be? (mm)
tensionThick = 4; // [2:10]

// How large is the belt width? (1/10 mm)
beltWidth = 65; // [30:100]

// How deep is the notch? (mm)
notchDepth = 2; // [1:10]

  //////////////////////
 // Static Settings: //
//////////////////////

module GoAwayCustomizer() {
// This module is here to stop Customizer from picking up the variables below
}

// ---------------------------------------------------

beltTensioner(beltWidth/10, 3, tensionLength, tensionThick, notchDepth);

module beltTensioner(belt_width, post_width, length, thickness, notch_depth)
{
	module _beltTensioner(width, length, thickness, post_width, notch_depth)
	{
		cutout_width = width - post_width + 2;
		cutout_length = (length - post_width * 3) / 2;
		cutout_thickness = thickness + 6;

		notch_width = width - post_width * 2;
		module cutout()
		{
			translate([post_width / 2 + 1, length / 2 - cutout_length / 2 - post_width, 0])
			{
				cube([cutout_width, cutout_length, cutout_thickness], center=true);
			}
		}

		module notch_cutout()
		{
			translate([0,  length / 2 - post_width / 2, thickness / 2 - notch_depth / 2 + 1])
			{
				cube([notch_width, post_width + 2, notch_depth + 2], center= true);
			}
		}
		difference()
		{
			// Main body
			cube([width, length, thickness], center=true);

			// Notches for "S" shape
			union()
			{
					cutout ();
					mirror([1, 0, 0])
					{
						mirror([0, 1, 0])
						{
							cutout ();
						}
					}

					// Notches for belt guide
					notch_cutout();
					mirror([0, 1, 0])
					{
						notch_cutout();
					}
			}
		}
	}
	_beltTensioner(belt_width + post_width * 2, length, thickness, post_width, notch_depth);
}

```


[User]
Hey, I'm looking to create a parametric design for a hoe head that can be 3D printed on a metal RepRap printer. I have a basic idea, but I need your help to create a robust and customizable OpenSCAD file (or files, if that makes sense for the design).

My main goal is to have a hoe head with adjustable dimensions, so it can be adapted for different use cases and material availability. Here’s what I had in mind:

**Key Features and Parameters:**

*   **Blade Back Radius (r):** This controls the curvature of the hoe head back. It should be adjustable.
*   **Resolution (n):** The fineness of the curves on the hoe should be controlled to help reduce print time and artifacts (basically the $fn value).
*   **Hoe Head Height (h):** The vertical thickness of the main body of the hoe.
*   **Handle Hole Radius (x):** The radius of the circular hole for the handle. I also need to be able to easily create a rectangular hole to accommodate a more common handle.
*  **Hoe Scale (s):** The depth of the hoe head, that is the length from the attachment points to the end of the blade.
*   **Blade Base Thickness (b):** The thickness of the blade at the point where it transitions from the main body.
* **Blade Width (w):** The width of the blade.
*   **Handle Insertion Length (l):** The length that the handle will pass through the hoe head.

**Design Details:**

*   The hoe head should consist of a main curved back portion that connects to the blade. This should use the `r` value.
*   The blade should connect to the main body, creating the "business end" of the hoe. I need control over its thickness (`b`) and width (`w`).
*   There should be both a circular and a rectangular hole to accommodate different handles.
*   I am planning on using a metal printer (like the one linked above, but this is not critical to the design).

**General Expectations:**

*   I would like the code to be well-commented, which makes it easier for people to understand.
*   I need all of the code from scratch; please do not try to improve upon the SCAD code I provided above.
*   I’d prefer the use of only the standard OpenSCAD libraries for maximum compatibility.

Could you generate the OpenSCAD code based on these requirements? Let me know if you need any more information from my side! Thanks!

[Assistant]
hoe.scad:
```
// Customizable simple hoe head

//Customizer Variables

//axe head back
r= 60; //[1:200]

//resolution
n=100; //[1:200]

//hoe head height
h=20; //[1:500]

// handle hole radius
x=25; //

//scale LENGTH OF HOE
s=150; //

// base blade thickness
b=30;//

// blade width
w=120;

l=50;

module chuck(){
	union(){
translate([0,-0.1*r,0])cube([r,0.7*r,h], center = true);
translate([0,0.3*r/2,0])cylinder(h = h, r1 = r/2, r2 = r/2, center = true, $fn=n);
}
}

module chunk(){
chuck();
hull(){
cylinder(h = h, r1 = b, r2 = b, center = true, $fn=n);
translate([0,s,-h/2])rotate([0,90,0])cylinder(h = w, r1 = 0.1, r2 = 0.1, center = true, $fn=n);
				}
}

module hoe(){
	difference(){
	chunk();
	translate([0,x*.1,0])cylinder(h = h+l+1, r1 = x, r2 = x, center = true, $fn=n); //HANDLE HOL
	translate([-x,-x*.9,-h/2-1])cube([2*x, x,h+l+1,]); //SQUARE HANDLE HOLE
	}
					}
hoe();

```


[User]
Hey, I'm looking to create a parametric ring design in OpenSCAD, and I'd love some help getting started. I've got a general idea, but I need some flexibility.

The basic ring should have these features:

*   A main band, basically a cylinder.
*   A "topper" element, kind of like a signet ring, that sits on top of the band.
*   I'd like to be able to control the ring size (finger diameter), band width and thickness, plus the size of the topper independently.
*   I'd like to embed a logo into the topper as a recessed area.
*   I'd like the edges where the band and topper meet to be rounded.
*   I don't need any advanced features or libraries beyond what's built in to OpenSCAD, and the standard OpenSCAD library.

I need these parameters to be easily accessible to change, so that I can tweak them.

Could you help me generate the OpenSCAD code for this?

[Assistant]
NM_Ring.scad:
```
// preview[view:south east, tilt:bottom diagonal]

// Finger diameter in mm
ring_size = 20;

// Band width in mm
band_width = 6;

// Multiplying by 1 ensures these variables do not appear in Customizer.
band_thickness = 1*2;
logo_depth = 1*1;
topper_width = 1*23;
topper_height = 1*20;

function scaleFactor(ringSize) = (ringSize+2*band_thickness)/topper_width;

module ring(size, width)
{
	topper_thickness = 10;
	scaleAmt = scaleFactor(size);

	difference()
	{
		union()
		{
			// Outer cylinder
			cylinder(h=width, r=size/2+band_thickness, center=true, $fn=200);

			// Topper
			translate([-size/2-band_thickness, 0, -topper_height/2*scaleAmt])
			rotate([90, 0, 0])
			ringTopper(size/2 + band_thickness+1, size);
		}

		// Hollow out for the finger.
		cylinder(h=topper_width*scaleAmt+1, r=size/2, center=true, $fn=200);

		// Round the union of the band & the topper.
		for(i = [-1,1])
		{
			translate([-size/2-band_thickness-.5, 0, (width/2 + size/2 + 2)*i])
			rotate([0, 90, 0])
			cylinder(h=size+band_thickness*2+1, r=size/2+2, $fn=200);
		}
	}
}

module ringTopper(thickness, ringSize)
{
	corner_angle = 35;

	scaleAmt = scaleFactor(ringSize);
	scale([scaleAmt, scaleAmt, 1.0])
	difference()
	{
		cube([topper_width, topper_height, thickness]);

		translate([topper_width/2, topper_height/2, thickness - .5])
		scale([0.15, 0.15, 1.0])
		#nmLogo(logo_depth);

/*
		translate([topper_width, cos(corner_angle)*topper_height*0.6+0.5, thickness - logo_depth])
		rotate([0, 0, corner_angle])
#		cube([topper_width*0.25, topper_height*0.6, logo_depth+0.1]);
*/
	}
}

rotate([90,0,0]) ring(ring_size, band_width);

/* Begin NM Logo */
fudge = 0.1;

module poly_path3079(h)
{
  scale([25.4/90, -25.4/90, 1]) union()
  {
    linear_extrude(height=h)
      polygon([[-69.823040,215.973605],[-69.823040,194.226438],[-47.660872,194.226438],[-47.660872,215.973605],[-35.247021,215.973605],[-35.247021,165.046683],[-47.660872,165.046683],[-47.660872,184.798073],[-69.823040,184.798073],[-69.823040,165.046683],[-82.236901,165.046683],[-82.236901,215.973605]]);
  }
}

module poly_path3073(h)
{
  scale([25.4/90, -25.4/90, 1]) union()
  {
    linear_extrude(height=h)
      polygon([[-236.966025,215.973605],[-236.966025,183.215208],[-236.813711,183.215208],[-212.214465,215.973605],[-200.790671,215.973605],[-200.790671,165.046683],[-212.214465,165.046683],[-212.214465,197.529805],[-212.366779,197.529805],[-235.975957,165.046683],[-248.389818,165.046683],[-248.389818,215.973605]]);
  }
}

module poly_path3081(h)
{
  scale([25.4/90, -25.4/90, 1]) union()
  {
    linear_extrude(height=h)
      polygon([[8.016879,215.973605],[8.016879,180.668861],[8.169193,180.668861],[9.778049,187.370218],[11.444016,192.574750],[19.821463,215.973605],[30.788314,215.973605],[39.241923,192.574750],[40.945971,187.155164],[42.364421,181.219421],[42.516746,181.219421],[42.516746,215.973605],[54.473644,215.973605],[54.473644,165.046683],[37.718750,165.046683],[25.990318,202.484852],[25.838004,202.484852],[13.271828,165.046683],[-3.102286,165.046683],[-3.102286,215.973605]]);
  }
}

module poly_path3083(h)
{
  scale([25.4/90, -25.4/90, 1]) union()
  {
    linear_extrude(height=h)
      polygon([[79.013086,215.973605],[79.013086,165.046683],[66.675387,165.046683],[66.675387,215.973605]]);
  }
}

module poly_path3085(h)
{
  scale([25.4/90, -25.4/90, 1]) union()
  {
    linear_extrude(height=h)
      polygon([[114.128479,216.937097],[119.076985,216.585732],[123.407904,215.658542],[127.121240,214.155520],[130.216995,212.076664],[132.777201,209.517151],[134.884047,206.572134],[136.537533,203.241615],[137.737658,199.525592],[126.085388,197.185697],[124.325376,201.795590],[123.191035,203.633570],[121.887139,205.160242],[120.365436,206.361105],[118.577785,207.221627],[116.524187,207.741809],[114.204642,207.921653],[111.180891,207.594770],[108.535564,206.700107],[106.268659,205.237671],[104.380173,203.207470],[102.891501,200.674036],[101.824087,197.701869],[101.177932,194.290966],[100.953037,190.441325],[101.169580,186.669942],[101.800266,183.332439],[102.845081,180.428816],[104.304011,177.959068],[106.162749,175.982927],[108.407044,174.560023],[111.036900,173.690354],[114.052317,173.373920],[116.343308,173.569382],[118.339789,174.089037],[120.041761,174.932883],[121.449226,176.100919],[123.658988,179.209685],[125.247644,183.215208],[136.976076,180.118301],[135.904169,176.774361],[134.380688,173.751387],[132.405631,171.049380],[129.978998,168.668340],[126.998972,166.716404],[123.363878,165.301568],[119.073715,164.423833],[114.128479,164.083201],[108.890479,164.488550],[104.121935,165.714664],[99.822845,167.761676],[95.993206,170.629715],[94.303955,172.373689],[92.831131,174.326941],[90.534766,178.861284],[89.104114,184.232744],[88.539175,190.441325],[89.077343,196.731659],[90.470510,202.159045],[92.718678,206.723486],[94.163389,208.682103],[95.821851,210.424985],[99.614004,213.284517],[103.929159,215.323045],[108.767316,216.540571],[114.128479,216.937097]]);
  }
}

module poly_path3087(h)
{
  scale([25.4/90, -25.4/90, 1]) union()
  {
    difference()
    {
       linear_extrude(height=h)
         polygon([[158.873580,215.973605],[158.873580,196.772785],[166.032492,196.772785],[177.760924,215.973605],[190.860205,215.973605],[178.294029,195.327557],[180.967592,194.448767],[183.307380,193.319959],[185.313394,191.941134],[186.985635,190.312291],[188.304405,188.402812],[189.250130,186.182022],[189.822815,183.649918],[190.022461,180.806499],[189.622621,176.902594],[188.508790,173.582567],[186.680981,170.846419],[184.139205,168.694149],[180.947660,167.070988],[177.170664,165.922024],[172.808212,165.247256],[167.860304,165.046683],[146.688195,165.046683],[146.688195,215.973605]]);
       translate([0, 0, -fudge])
         linear_extrude(height=h+2*fudge)
           polygon([[158.873580,174.199764],[167.327189,174.199764],[172.001403,174.568634],[173.824456,175.060311],[175.304805,175.756820],[176.449543,176.688872],[177.265863,177.887048],[177.753761,179.351351],[177.913239,181.081783],[177.753761,182.856878],[177.265863,184.356140],[176.449543,185.579573],[175.304805,186.527178],[173.824452,187.232869],[172.001399,187.730476],[167.327189,188.101440],[158.873580,188.101440]]);
    }
  }
}

module poly_path3089(h)
{
  scale([25.4/90, -25.4/90, 1]) union()
  {
    difference()
    {
       linear_extrude(height=h)
         polygon([[224.300500,216.937097],[227.691126,216.760121],[230.970698,216.222000],[234.139218,215.322637],[237.196688,214.061937],[240.057374,212.434153],[242.635652,210.433589],[244.931525,208.060246],[246.944994,205.314126],[248.590310,202.189510],[249.781865,198.680641],[250.519661,194.787520],[250.803700,190.510149],[250.519638,186.232800],[249.781845,182.339687],[248.590302,178.830809],[246.944994,175.706163],[244.931525,172.960070],[242.635652,170.586738],[240.057374,168.586166],[237.196688,166.958351],[234.139216,165.697631],[230.970694,164.798201],[227.691122,164.260058],[224.300500,164.083201],[220.892475,164.260183],[217.598168,164.798315],[214.417578,165.697676],[211.350704,166.958351],[208.482671,168.586166],[205.898652,170.586738],[203.598646,172.960070],[201.582652,175.706163],[199.935810,178.830809],[198.743275,182.339687],[198.005047,186.232800],[197.721127,190.510149],[198.005025,194.787524],[198.743255,198.680645],[199.935803,202.189512],[201.582652,205.314126],[203.598646,208.060246],[205.898652,210.433589],[208.482671,212.434153],[211.350704,214.061937],[214.417578,215.322685],[217.598168,216.222128],[220.892475,216.760265],[224.300500,216.937097]]);
       translate([0, 0, -fudge])
         linear_extrude(height=h+2*fudge)
           polygon([[224.300500,207.921653],[221.165186,207.594504],[218.392233,206.701186],[215.981639,205.241706],[213.933406,203.216073],[212.295687,200.690434],[211.116711,197.730900],[210.396479,194.337472],[210.134989,190.510149],[210.396474,186.697903],[211.116707,183.332439],[212.295685,180.413759],[213.933406,177.941862],[215.981639,175.970025],[218.392233,174.551423],[221.165186,173.686055],[224.300500,173.373920],[227.415247,173.686047],[230.176585,174.551416],[232.584513,175.970023],[234.639032,177.941862],[236.286531,180.413763],[237.473526,183.332443],[238.200015,186.697904],[238.466000,190.510149],[238.200011,194.337472],[237.473522,197.730900],[236.286530,200.690434],[234.639032,203.216073],[232.584513,205.241700],[230.176585,206.701171],[227.415247,207.594488],[224.300500,207.921653]]);
    }
  }
}

module poly_path3014(h)
{
  scale([25.4/90, -25.4/90, 1]) union()
  {
    linear_extrude(height=h)
      polygon([[-247.126130,116.237093],[-247.577961,115.482729],[-247.921717,112.747253],[-248.355083,94.008695],[-248.695820,-47.808727],[-248.670192,-186.191160],[-248.336987,-207.210597],[-248.058154,-210.939354],[-247.692260,-212.152037],[-246.509614,-212.869071],[-243.534693,-213.253763],[-225.723370,-213.392167],[-210.521425,-213.202557],[-203.155510,-212.846717],[-202.059053,-212.247137],[-200.012087,-210.071553],[-189.270147,-195.743344],[-114.618900,-90.435577],[-44.115528,9.128900],[-34.482102,22.166302],[-32.935991,23.859387],[-32.376390,23.996573],[-31.907890,1.732392],[-31.726940,-55.274767],[-31.726940,-134.144717],[-29.869090,-135.362027],[-28.164262,-136.140645],[-26.833370,-135.847297],[-24.890189,-133.889678],[-20.351847,-128.322773],[1.153510,-100.496147],[16.844490,-80.028927],[16.844490,17.428863],[16.661240,101.719128],[16.261628,113.459682],[15.935081,115.393408],[15.505090,116.098803],[14.143163,116.743913],[10.839082,117.081723],[-7.791740,117.102363],[-29.749150,116.893773],[-32.397400,113.908593],[-51.544995,87.393717],[-93.861890,27.837163],[-186.580388,-102.837443],[-197.823037,-117.955233],[-199.265426,-119.345461],[-199.516913,-119.296685],[-199.674320,-119.056087],[-200.102813,-84.273378],[-200.287430,-1.980727],[-200.298330,114.144753],[-201.951510,115.697843],[-203.281602,116.582652],[-206.176643,117.045175],[-224.672140,117.250923],[-241.878097,117.052003],[-245.543871,116.741999],[-247.126100,116.237093]]);
  }
}

module poly_path3016(h)
{
  scale([25.4/90, -25.4/90, 1]) union()
  {
    linear_extrude(height=h)
      polygon([[191.880140,118.667353],[189.705315,117.686216],[187.951570,116.121923],[88.853103,-22.006968],[-20.607860,-175.138777],[-32.653890,-192.171327],[-32.998270,-202.315607],[-33.111817,-209.256569],[-32.926255,-211.447909],[-32.490165,-212.976162],[-31.736817,-213.983580],[-30.599483,-214.612419],[-26.905940,-215.303377],[-19.518652,-215.454665],[-6.550745,-215.336219],[5.851715,-215.046837],[11.542660,-214.685317],[127.278137,-53.284478],[243.574860,109.860253],[245.935349,113.822951],[246.730143,116.430521],[246.540999,117.321993],[245.961146,117.989714],[243.630260,118.807283],[234.306781,119.179745],[217.414635,119.266627],[200.692785,119.088856],[191.880190,118.667353],[191.880180,118.667353]]);
  }
}

module poly_path2996(h)
{
  scale([25.4/90, -25.4/90, 1]) union()
  {
    difference()
    {
       linear_extrude(height=h)
         polygon([[188.480010,119.588283],[184.774960,115.148383],[101.878310,-0.727497],[78.163300,-33.824677],[60.012700,-59.118457],[42.836600,-83.051247],[32.173500,-97.850797],[4.008880,-137.152457],[-7.942930,-153.772627],[-14.531140,-162.921437],[-19.912790,-170.434757],[-26.055930,-179.045407],[-27.939510,-181.551107],[-31.475900,-186.568927],[-34.679520,-191.317667],[-34.704920,-202.829387],[-34.564358,-212.976892],[-34.202294,-214.657575],[-33.504950,-215.571027],[-32.279620,-216.800947],[-10.632920,-216.937097],[6.705334,-216.899972],[10.658849,-216.712670],[12.340850,-216.392177],[13.954657,-214.964649],[15.971130,-212.488877],[24.331050,-200.734067],[31.607190,-190.508917],[33.759850,-187.467917],[37.922050,-181.616797],[42.612340,-175.035587],[161.485870,-8.580427],[179.590730,16.719423],[199.745670,44.973113],[203.781910,50.675003],[215.247580,66.718513],[226.010890,81.836583],[229.926850,87.319783],[240.948650,102.600283],[247.628268,112.274946],[248.650693,114.397891],[248.872320,115.966483],[248.586299,118.098271],[247.372940,119.599083],[245.863010,120.897883],[217.949710,120.897883],[190.036410,120.897883],[188.479990,119.588283]]);
       translate([0, 0, -fudge])
         linear_extrude(height=h+2*fudge)
           polygon([[246.405190,118.527283],[247.100263,117.775131],[247.478103,116.958860],[247.490085,115.964110],[247.087584,114.676521],[244.844631,110.765388],[240.360240,104.310583],[123.037050,-60.042977],[44.963050,-169.170250],[11.926190,-214.861107],[5.103280,-215.418442],[-8.601435,-215.776097],[-22.538995,-215.834088],[-30.060440,-215.492437],[-32.119863,-214.589895],[-32.776812,-213.827498],[-33.225782,-212.704577],[-33.621380,-208.917835],[-33.549840,-202.311027],[-32.860210,-191.718367],[-0.707798,-146.322085],[75.973770,-39.148447],[186.756050,115.366283],[188.839583,117.883883],[190.492000,119.235383],[198.753533,119.586571],[218.555120,119.654483],[241.615763,119.420583],[245.176220,119.101602],[246.405190,118.527283]]);
    }
    difference()
    {
       linear_extrude(height=h)
         polygon([[-247.906030,117.973383],[-249.308145,116.980458],[-250.193240,115.492383],[-250.478447,106.142773],[-250.667201,77.866097],[-250.803700,-48.452707],[-250.791686,-150.187397],[-250.472528,-198.710317],[-250.065059,-209.170200],[-249.421549,-213.710546],[-248.994690,-214.529997],[-248.488914,-214.792490],[-247.214070,-214.877167],[-239.265562,-215.328857],[-224.425690,-215.469588],[-209.623092,-215.304958],[-201.786410,-214.840567],[-200.667603,-214.380626],[-199.655385,-213.634120],[-197.291560,-210.669787],[-193.828040,-205.768587],[-179.496780,-185.341657],[-173.954020,-177.475177],[-166.727000,-167.289757],[-154.011660,-149.261217],[-139.944690,-129.349087],[-90.170710,-59.000477],[-87.853980,-55.771487],[-79.617390,-44.049857],[-72.237740,-33.531977],[-57.871370,-13.167757],[-39.030870,13.533853],[-34.894360,19.399873],[-33.384840,21.498743],[-33.357740,13.480053],[-33.374740,-63.303137],[-33.268630,-115.787914],[-32.848180,-134.186737],[-32.098371,-135.926263],[-31.096930,-137.132787],[-29.077959,-137.883502],[-26.805757,-137.715135],[-24.639489,-136.721699],[-22.938320,-134.997207],[-2.417430,-108.043457],[17.735930,-81.461737],[18.117293,-56.431095],[18.148870,17.858443],[18.010000,116.147683],[16.500040,117.446483],[14.990070,118.745183],[-7.448330,118.735183],[-25.323832,118.580658],[-29.473523,118.371049],[-31.232140,118.048583],[-32.676567,116.866969],[-35.102200,113.932821],[-45.528160,99.369183],[-64.865980,71.922783],[-91.158820,34.789333],[-103.147490,17.837123],[-112.115130,5.190233],[-132.498830,-23.601627],[-145.052350,-41.361087],[-178.399650,-88.450567],[-191.878130,-107.494077],[-197.355906,-114.956764],[-198.289889,-115.690967],[-198.668520,-115.158387],[-198.906272,-80.758938],[-198.943430,-0.052337],[-198.995035,80.733323],[-199.267470,115.322883],[-199.622931,116.426502],[-200.238123,117.262930],[-201.388052,117.868804],[-203.347725,118.280758],[-210.796323,118.669449],[-224.783970,118.722083],[-242.163150,118.555433],[-246.104874,118.327912],[-247.905990,117.971183]]);
       translate([0, 0, -fudge])
         linear_extrude(height=h+2*fudge)
           polygon([[-201.514530,115.889883],[-200.216150,114.379883],[-200.216150,-2.680517],[-200.080900,-99.665108],[-199.841862,-115.799369],[-199.659081,-118.797496],[-199.426350,-119.566957],[-192.440475,-110.354119],[-176.753730,-88.448447],[-147.228350,-46.740617],[-93.117500,29.678883],[-39.095720,105.976383],[-32.521530,114.870171],[-30.890375,116.525101],[-29.638180,117.177383],[-22.750901,117.548096],[-6.625460,117.568483],[14.483170,117.399883],[15.708400,116.174083],[16.933630,114.948183],[16.933630,17.147163],[16.933630,-80.653887],[-3.446140,-107.288657],[-24.972760,-135.101517],[-26.388265,-136.221413],[-27.789600,-136.682539],[-29.138787,-136.481307],[-30.397850,-135.614127],[-31.770350,-134.241637],[-31.770350,-55.106847],[-31.906141,9.436805],[-32.130247,21.029229],[-32.506820,24.027943],[-36.181012,19.562011],[-43.980520,8.824773],[-167.309470,-165.675397],[-192.681830,-201.622157],[-198.556113,-209.609273],[-201.721420,-213.266827],[-208.160476,-213.695459],[-224.697990,-213.841207],[-246.438360,-213.841207],[-247.948330,-212.542387],[-249.458290,-211.243577],[-249.458290,-48.189327],[-249.322028,92.750570],[-249.024311,112.090572],[-248.780900,115.089002],[-248.460300,115.967683],[-247.416280,116.815458],[-246.307640,117.305183],[-223.982930,117.469783],[-202.812900,117.399783],[-201.514530,115.889783]]);
    }
  }
}

module poly_path3075(h)
{
  scale([25.4/90, -25.4/90, 1]) union()
  {
    difference()
    {
       linear_extrude(height=h)
         polygon([[-182.257176,215.973605],[-177.916133,204.618276],[-158.724160,204.618276],[-154.535432,215.973605],[-141.969256,215.973605],[-161.922821,164.840222],[-173.727405,164.840222],[-193.680970,215.973605]]);
       translate([0, 0, -fudge])
         linear_extrude(height=h+2*fudge)
           polygon([[-168.243990,179.154820],[-168.091676,179.154820],[-161.618182,196.497500],[-174.869787,196.497500]]);
    }
  }
}

module poly_path3077(h)
{
  scale([25.4/90, -25.4/90, 1]) union()
  {
    linear_extrude(height=h)
      polygon([[-113.950510,216.937097],[-108.489123,216.570144],[-103.809542,215.669298],[-99.911763,214.234556],[-96.795785,212.265919],[-94.415259,209.913406],[-92.723712,207.327008],[-91.721144,204.506725],[-91.407552,201.452556],[-91.943668,197.893810],[-93.204461,194.886696],[-95.189932,192.431212],[-97.900086,190.527355],[-104.452133,187.690692],[-111.818070,185.692731],[-116.743410,184.329254],[-120.376402,182.836697],[-121.685090,181.971086],[-122.624284,180.931263],[-123.193983,179.717226],[-123.394187,178.328975],[-122.859912,176.255797],[-121.290297,174.647098],[-118.735432,173.606218],[-115.245206,173.236282],[-111.183834,173.755684],[-107.372314,175.223466],[-104.032071,177.504239],[-101.384334,180.462400],[-92.778411,174.543863],[-94.392051,172.506434],[-96.319827,170.615771],[-101.117787,167.274730],[-104.030870,165.932497],[-107.343775,164.953164],[-111.056503,164.336732],[-115.169055,164.083201],[-119.544914,164.358517],[-123.454890,165.124150],[-126.898982,166.380104],[-129.877191,168.126383],[-132.287792,170.317903],[-134.029028,172.909422],[-135.100901,175.900939],[-135.503410,179.292457],[-134.967921,182.868974],[-133.704166,185.864806],[-131.712142,188.279958],[-128.991846,190.114433],[-122.394621,192.841446],[-114.940578,194.845812],[-110.039078,196.238364],[-106.458408,197.779281],[-105.179500,198.661854],[-104.262927,199.694426],[-103.708689,200.877000],[-103.516785,202.209577],[-103.719395,203.586791],[-104.248644,204.778509],[-105.104530,205.784733],[-106.287053,206.605460],[-109.396488,207.696911],[-113.341243,208.059290],[-118.013118,207.488291],[-122.213724,205.814028],[-124.098065,204.577694],[-125.786053,203.094570],[-127.277689,201.364653],[-128.572974,199.387945],[-137.940489,204.411825],[-136.213532,207.063016],[-134.138507,209.446451],[-131.715411,211.562133],[-128.944244,213.410062],[-125.798247,214.916037],[-122.250628,216.005867],[-118.301383,216.679554],[-113.950510,216.937097]]);
  }
}

module nmLogo(h)
{
	poly_path3079(h);
	poly_path3073(h);
	poly_path3081(h);
	poly_path3083(h);
	poly_path3085(h);
	poly_path3087(h);
	poly_path3089(h);
	poly_path3014(h);
	poly_path3016(h);
	poly_path2996(h);
	poly_path3075(h);
	poly_path3077(h);
}

/* END NM Logo */

```


[User]
I need a parametric OpenSCAD design for a PCB mount. I have a specific PCB size in mind, but I'd like the mount to be easily adaptable for other boards in the future. It should be a simple, box-like design with a cutout that snugly fits the PCB, and it needs mounting holes so I can attach it to a surface.

Here are the details:

1.  **Parametric PCB Dimensions:** The design needs parameters for `pcb_width`, and `pcb_length` to define the size of the PCB. I'd like to set them like this, by default: `pcb_width = 100;` and `pcb_length = 52;`.
2.  **Mounting Holes:** There should be four mounting holes, one in each corner, that allow for countersunk screws. The diameter of the mounting holes and countersink depth should also be parameters, e.g. `mounting_hole_diameter` and `countersink_depth`. By default I would like `mounting_hole_diameter=3;` and `countersink_depth=1.5;` and the diameter of the countersunk hole should be `mounting_hole_diameter*2` (i.e. 6).
3.  **PCB Support:** The PCB cutout should have a small clearance around the PCB to allow for easy insertion/removal. Let's say a clearance of 1mm on all sides and a depth of 5mm.
4. **Wall Thickness:** I would like to control the wall thickness with a parameter called `wall_thickness` with a default of 3mm
5.  **Fillet:** I would like to have a small fillet at the bottom of the case, where the PCB rests. The fillet parameter should be called `fillet_radius`, and let's make the default 1mm.
6.  **Mounting Hole Extension:** To make it easier to get a nut in for mounting the PCB to the case, I would like to have a small cylindrical extension added to the mounting holes at the depth that the PCB sits. The radius of this extension should be a parameter called `mounting_extension_radius`. The height of the extension should be just slightly more than the wall thickness so you don't see it externally.

Ideally, I'd like to use the BOSL2 library for the fillet, countersinking and cylindrical extension. I'd like the final design to be in a single .scad file.

[Assistant]
PCB-Mounting.scad:
```
// Give the PCB Measurements below.
// DO NOT ADD ANY EXTRA MARGIN AS THAT IS ALREADY CALCULATED

pcbwidth = 100;
pcblength = 52;

// DO NOT CHANGE ANYTHING BELOW THIS LINE
rotate(a=[180,0,0]){
	difference(){
		cube([pcbwidth+6,pcblength+6,8]);
		translate([2,2,0])
			cube([pcbwidth+2,pcblength+2,5]);
		translate([19,8,4],center=true){
			cylinder(h=10,r=3);
			cylinder(h=3,r1=5,r2=3);
		}
		translate([pcbwidth-13,8,4],center=true){
			cylinder(h=10,r=3);
			cylinder(h=3,r1=5,r2=3);
		}
		translate([pcbwidth-13,pcblength-2,4],center=true){
			cylinder(h=10,r=3);
			cylinder(h=3,r1=5,r2=3);
		}
		translate([19,pcblength-2,4],center=true){
			cylinder(h=10,r=3);
			cylinder(h=3,r1=5,r2=3);
		}
		translate([28,5,0])
			cube([pcbwidth-50,pcblength-4,8]);
		translate([5,14,0])
			cube([pcbwidth-4,pcblength-22,8]);
	}
	translate([5,5,3])
	difference(){
		cylinder(h=5,r=5);
		cylinder(h=5,r=2);
	}
	translate([pcbwidth+1,5,3])
	difference(){
		cylinder(h=5,r=5);
		cylinder(h=5,r=2);
	}
	translate([pcbwidth+1,pcblength+1,3])
	difference(){
		cylinder(h=5,r=5);
		cylinder(h=5,r=2);
	}
	translate([5,pcblength+1,3])
	difference(){
		cylinder(h=5,r=5);
		cylinder(h=5,r=2);
	}
	echo("The PCB has a dimention of ", pcbwidth, "x", pcblength, "mm");
	echo("The PCBHolder will have a final dimension of ", pcbwidth+6, "x", pcblength+6, "mm");
}
```


[User]
Hey, I'm looking to create a 3D-printable leg cage for my cat. He's got a bandage on his leg, and I'd like to make something that protects it so he doesn't have to wear that awful cone. I've done a little bit of OpenSCAD before, so I understand the basics, but I'm hoping you can help me create a parametric design that I can adjust as needed.

Here's what I'm thinking: The cage should be a cylindrical shape, with rounded ends, like a capsule. It will go around the cat's leg and the bandage, so we'll need to define the inner diameter and length of the cylinder to fit snugly around the bandage, but not too tight. There should also be a specified thickness for the cage walls, so it's not too flimsy. We also need an opening for the cat's leg to fit inside the cage, and this will have its own diameter.

I would like to have air holes in the cage to keep the bandage from getting too sweaty. It would be great to have multiple rows of these holes running lengthwise and rotated around the cylinder, using a parameter to control their quantity.

Finally, I'd really prefer it to have a simple design, avoiding any supports. I can print with a decent overhang, so I don't think that will be an issue. I'm thinking I can orient it standing up on one of the flat circular ends.

I'm hoping to use OpenSCAD so I can adjust all these values later. Could you create a parametric .scad file for me that I can use? I'm not using any libraries so don't worry about that. Thanks!

[Assistant]
leg.scad:
```
inner_d   = 48;
inner_r   = inner_d/2;
inner_l   = 125;
leg_d     = 28;
leg_r     = leg_d/2;
thickness = 3;

huge = 500;

$fn=9;

module air_holes()
{
  // Air holes
  for(a = [0:120:240])
  {
    for(h = [0:thickness*4:(inner_l - (inner_r*2))])
    {
      translate([0,0,h])
      rotate([0,0,a])
      translate([-huge/2,-inner_r/2.5,0]) cube([huge, inner_r/1.25, thickness*2]);
    }
  }
}

difference()
{
rotate([0,90,0])
difference()
{
  union()
  {
    cylinder(r=inner_r + thickness, h=inner_l - (inner_r*2));
    sphere(r=inner_r+thickness);
    translate([0,0,inner_l - (inner_r*2)]) sphere(r=inner_r+thickness);
  }

  air_holes();

  // Insides
  cylinder(r=inner_r, h=inner_l - (inner_r*2));
  sphere(r=inner_r);
  translate([0,0,inner_l - (inner_r*2)]) sphere(r=inner_r);

  // Leg hole
  cylinder(r=leg_r, h=huge);

  // Air holes
  //for(a = [0:120:360])
  //{
  //  rotate([0,0,a]) translate([0,0,(inner_l - (inner_r*2))/2])
  //    cube([thickness*2, huge, inner_l - (inner_r*2)], center=true);
  //}

}
translate([-huge/2,-huge/2,-huge]) cube([huge,huge,huge]);
}

```


[User]
Hey, I'm looking to create a custom vase decorator with a "bubble" aesthetic, and I'd like it to be easily customizable for different sized vases. I have some ideas on how I want it to work, but I need help getting it into OpenSCAD code.

Basically, the decorator will be a hollow cylinder that fits around a vase. I need to be able to set the vase's radius, and the decorator should automatically add a 1mm margin to the inner radius. I also need to define the decorator's thickness and overall height.

The "bubble" effect will come from a series of cylindrical holes that wrap around the decorator. I need to be able to control the rotation and scale of these holes as they move up the height of the decorator. I'm thinking there should be two parameters for this: one for a rotation factor (R_factor) and another for a scale factor (S_factor). Both should be adjustable.

The decorator will have a flat base, which I'd like to be able to control the thickness of via the W_bottom variable. The decorator should have a base that is at least the thickness of the walls, W_ext.

I'd like the holes to be aligned vertically, but the hole positions should vary in the z-axis to create a wavy pattern. I'd like the hole placement to be derived based on the circumference of the vase, which I'd like to be calculated as part of the code. There should also be a bit of variability on top, V_top.

I'd also like to have a variable H_sym that determines if the cylinders are centered or not, so I can set it to false for better visibility in the center.

I don't need any included libraries, just pure OpenSCAD. Could you generate a parametric OpenSCAD file for me, using the following variable names as guidelines: `R_vase`, `Thickness`, `Height`, `R_factor`, `S_factor`, `W_bottom`, `R_in`, `W_ext`, `R_ext`, `R_top`, `V_top`, `H_sym`, `H_ext`, `W_hole`, and `nb_holes`?

[Assistant]
cache_customizer.scad:
```
// Vase radius (in mm, a 1 mm margin will be automatically added)
R_vase = 30;
// Decorator thickness (mm)
Thickness = 2;
// Decorator total height (mm)
Height = 100;
// Holes: Rotation factor
R_factor = 3; // [-10:10]
// Holes: Scale factor
S_factor = 0.15;

/* [Hidden] */
R_in  = R_vase + 1;
W_ext = Thickness;

W_bottom = 10;
R_ext = R_in + W_ext;

R_top = 2 * 3.14159 * R_in / 12;
V_top = R_top / 5; // Variation on top
H_sym = true;
H_ext = Height + R_top + V_top;

W_hole = 6;

nb_holes = (Height / R_top / 2);

$fa = 2;
$fs = 1;

intersection() {
	difference() {
		cylinder(r = R_ext, h = H_ext);
		translate([0, 0, W_ext]) cylinder(r = R_ext - W_ext, h = H_ext);
		cylinder(r = R_ext - W_bottom, h = W_ext);
		for (i = [0:5]) {
			for (j = [0:nb_holes]) {
				translate([0, 0, Height + V_top * ((i % 3) - 1) - j * (2 * R_top - W_hole)]) {
					rotate([90, 0, 60 * i  - R_factor * j * j]) {
						cylinder(r = (R_top - W_hole) - S_factor * j * (R_top - W_hole), h = 2 * R_ext, center = H_sym);
					}
				}
			}
		}
	}
	union() {
		for (i = [0:5]) {
			translate([0, 0, Height + V_top * ((i % 3) - 1)]) {
				rotate([90, 0, 60 * i]) {
					cylinder(r = R_top, h = 2 * R_ext, center = H_sym);
				}
			}
		}
		translate([-R_ext, -R_ext, 0]) cube([2 * R_ext, 2 * R_ext, Height]);
	}
}

```


[User]
I need help designing a parametric spool holder for my 3D printer. I have a Mendel90, and the provided spool holder only fits very specific spools that I can't buy. I'd like to design one that's fully printable and just snaps onto my printer's gantry. It needs to accommodate different spool sizes and be customizable.

Here are the key parameters:

*   **Gantry Dimensions:**
    *   `gantryHeight`: The height of the gantry the holder needs to grip around. I'll need to be able to adjust this, and it should have an offset for shrinkage.
    *   `gantryThickness`: The thickness of the gantry the holder grips.

*   **Spool Dimensions:**
    *   `rollRadius`: The minimum internal radius of the filament spool.
    *   `spoolRadiusMargin`: How much bigger than the minimum radius the holder should also accommodate.
    *  `spoolWidth`: The width of the filament spool

*   **Holder Design:**
    *   `spoolNotch`: The height of the notch at the end of the holder arm.
    *   `spoolAngle`: The angle of the bottom arm of the spool holder. This is crucial to ensure the end aligns properly.
    *   `spoolHolderThickness`: The thickness of the spool holder arms.
    *  `baseThickness`: Thickness of the top vertical part of the holder that grabs the gantry
    * `baseThicknessBottom`: Thickness of the bottom vertical part of the holder
    *   `baseNotchTop`: How much the top of the holder should wrap around the gantry
    *   `baseNotchBottom`: How much the bottom of the holder wraps around the gantry (be careful with this so it isn't hard to snap on)
    *   `cornerRadius`: The radius of the rounded corners on the base

The holder is essentially two parts: a hook for the spool to sit on and a base that clips onto the printer's gantry.  I need the hook to have some internal hollowing, to save on material, and a notch at the end. The base needs a cutout for the gantry and be designed to allow for easy snapping on and off. I need rounded corners to look nice and avoid sharp edges.

I’d like to be able to easily adjust all of those dimensions via customizable variables at the top of the file. The design should be in a single OpenSCAD file, and use the default `$fn=50`. No other libraries are required for this.

[Assistant]
SpoolHolder.scad:
```
/* [Main] */
// What's the height of the gantry the holder needs to grip around? (add ~1mm to compensate shrinkage)
gantryHeight = 101.1;

// What's the thickness of the gantry the holder needs to grip aroud?
gantryThickness = 3.3;

// What is the minimum internal radius of the roll of filament?
rollRadius = 15; // [10:50]

// How much bigger spool radius do you also want to accomodate?
spoolRadiusMargin = 20; // [0:50]

// What's the width of the fillament spool?
spoolWidth = 87; //[50:200]

/* [Extra] */
// Height of the notch at the end of the holder
spoolNotch = 3; //[1:10]

// Angle of the bottom arm of the spoolholder (set this so that the end aligns)
spoolAngle = 16.5; //[5:50]

// Thickness of the spoolholder arms
spoolHolderThickness = 3.5;//[1,1.5,2,2.5,3,3.5,4,4.5,5,5.5,6,6.5,7,7.5,8,8.5,9,9.5,10]

// Thickness of the top vertical part of the holder
baseThickness = 5; //[2:10]

// Thickness of the bottom vertical part of the holder
baseThicknessBottom = 2; //[1:10]

// How much should the top wrap around?
baseNotchTop = 3; //[1:10]

// How much should the bottom wrap around? (don't make this to high, otherwise it'll be hard to snap the holder on)
baseNotchBottom = 1; //[1:5]

// How round should the corners be?
cornerRadius = 4; //[0:10]

$fn =50;

module hook() {
	translate([0,0,rollRadius/2])	rotate([90,0,0]) intersection() {
		translate([-rollRadius,-rollRadius/2,0]) rotate([0,spoolAngle,0]) cube([spoolWidth/2,rollRadius, spoolWidth*1.2]);
		union() {
			difference() {
				translate([0,0,-1]) cylinder(spoolWidth+2,rollRadius, rollRadius);
				intersection() {    // make the holder hollow, for less printing
					rotate([0,spoolAngle,0]) translate([-rollRadius+spoolHolderThickness*1.2,-rollRadius/2-1,-10])
						cube([spoolWidth/2,rollRadius*2, spoolWidth*1.2]);
					translate([0,0,-2]) cylinder(spoolWidth + 2, rollRadius-spoolHolderThickness, rollRadius-spoolHolderThickness);
				}
			}
			translate([spoolNotch,0,spoolWidth]) cylinder(spoolNotch, rollRadius, rollRadius);
		}
	}
}

module rounding(height, radius = 3) {
	height = height + 0.04;
	translate([0,0,-0.02]) difference() {
		cube([radius+0.02, radius+0.02, height]);
		cylinder(height, radius, radius);
	}
}

module base() {
	cubeX = gantryHeight + baseThickness + baseThicknessBottom;
	cubeY = gantryThickness + baseThickness * 2;
	cubeZ = rollRadius;

	translate([-cubeX+rollRadius+spoolNotch,0,0]) {
		difference() {
			cube([cubeX, cubeY, cubeZ]);
			union() {
				// rounded corners
				translate([cubeX-cornerRadius, cubeY-cornerRadius,0]) rounding(cubeZ, cornerRadius);
				translate([cornerRadius/2, cubeY-cornerRadius/2-baseThickness+baseThicknessBottom, 0]) rotate([0,0,90])
					rounding(cubeZ, cornerRadius/2);
				translate([cubeX-cornerRadius, cornerRadius, 0]) rotate([0,0,-90]) rounding(cubeZ, cornerRadius);
				translate([cornerRadius/2, cornerRadius/2+baseThickness-baseThicknessBottom, 0]) rotate([0,0,180])
					rounding(cubeZ, cornerRadius/2);

				// space for the gantry
				translate([baseThicknessBottom, baseThickness, -0.1]) cube([gantryHeight, gantryThickness, cubeZ+0.2]);
				translate([baseThicknessBottom+baseNotchBottom, baseThickness+gantryThickness-0.1, -0.1])
					cube([gantryHeight-baseNotchTop-baseNotchBottom, baseThickness+0.2, cubeZ+0.2]);

				// making the bottom part skinnier
				difference() {
					translate([-0.1,-0.1,-0.1])
						cube([cubeX-spoolNotch-rollRadius-spoolRadiusMargin*2+0.1, baseThickness-baseThicknessBottom+0.1, cubeZ+0.2]);
					translate([cubeX-spoolNotch-rollRadius-spoolRadiusMargin*2-cornerRadius*2+0.1,
								 baseThickness-baseThicknessBottom-cornerRadius*2+0.1, -0.1])
						rounding(cubeZ+0.2, cornerRadius*2);
				}
				translate([-0.1, baseThickness+baseThicknessBottom+gantryThickness,-0.1])
					cube([baseThickness+baseNotchBottom+0.2, baseThickness, cubeZ+0.2]);
			}
		}
	}
}

hook();
base();

```


[User]
Hey, I'm looking to create a custom ergonomic stand for my Apple Magic Trackpad. I've seen some designs out there, but I want something that's easily customizable to fit my specific needs.

Basically, I want a platform that holds the trackpad at an angle. I'd like to be able to adjust the angle of elevation, and also specify whether I'll be using the trackpad with my right or left hand.

Ideally, the design should be parametric, so I can tweak the dimensions if needed, maybe adjust how much of a lip there is at the front, or how thick the base walls are. The included description gives a good idea about what the stand should look like, with a slightly curved back wall, and thinner walls at the sides. The design should also have some cutouts on the underside/at the rear so the trackpad can fit better and not have its feet press against the base.

I'm primarily interested in OpenSCAD files for this. The design should have a primary module that generates the entire stand; I expect the main module name should probably be called 'trackpad_platform', and should take the 'angle' and 'handed' parameters. It looks like this could leverage some of the dotSCAD library's tools, but that's just a guess. I'm not sure whether it will be easiest to just write it all from scratch or reuse existing modules, but I'm happy for you to decide the best way to tackle this. I think the key will be to make sure the design looks sleek, but also is sturdy enough to support the trackpad.

Could you generate the OpenSCAD files for this? Let me know if you have any questions.

[Assistant]
magic_trackpad_ergonomic_support.scad:
```
/**
 * Parametric module to create an angled ergonomic support for the Apple Magic Trackpad.
 *
 * 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, 2014
 * @license    http://creativecommons.org/licenses/LGPL/2.1/
 * @license    http://creativecommons.org/licenses/by-sa/3.0/
 *
 * @see        http://www.thingiverse.com/thing:263636
 * @source     https://github.com/dotscad/things/blob/master/magic_trackpad_ergonomic_support/magic_trackpad_ergonomic_support.scad
 */

/* ******************************************************************************
 * Thingiverse Customizer parameters and rendering.
 * ****************************************************************************** */

/* [parameters] */

// Target angle of elevation
angle = 12; // [5:45]

// Which hand you use for the trackpad
handed = "right"; // [right,left]

/* [Hidden] */

// I don't know why but OpenSCAD freaks out if $fn is 50 or 100
$fn=75;

// A global overlap variable (to prevent printing glitches)
$o = .1;

// Render the part
trackpad_platform(angle, handed);

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

module round_corner() {
    difference() {
        translate([-5,-5,0]) cube([10,10,200]);
        translate([5,5,-1]) cylinder(r=5, h=202);
    }
}

// Newer variation of the lower wall, but it leaves the bottom edge of the support too
// thin/flimsy, so for now we'll use the original.
module lower_wall2(d) {
    t = 1;
    h = 6 + t;
    r = 11.5;
    union() {
        // back
        // @todo extend further.  may need to extend entire width just for strength.
        intersection() {
            translate([0,-1.3/2,0]) cube([3,16,d]);
            hull() translate([1.5,1,-10.1]) rotate([0,90,0])
                rotate_extrude(convexity = 10)
                translate([17, 0, 0])
                    circle(r = 1.5);
        }
        // front
        intersection() {
            cube([3,d,d]);
            hull() translate([1.5,d-16,-r/2]) rotate([0,90,0])
                rotate_extrude(convexity = 20)
                translate([r, 0, 0])
                circle(r = 1.5);
        }
    }
}

module lower_wall(d) {
    hull() {
        cube([3,1,6]);
        translate([1.5,-.5,6.5]) rotate([0,90,90]) cylinder(r=1.5,h=d-15);
        intersection() {
            cube([3,d,8]);
            translate([1.5,d-16,-5]) rotate([0,90,0])
                rotate_extrude(convexity = 10)
                translate([11.5, 0, 0])
                 circle(r = 1.5);
        }
     }
 }

module back_wall(d, angle) {
    t = .5;
    h = 6 + t;
    difference() {
        union() {
            cube([d+(tan(angle)*t),19+1.5+(1.5*1.5),h]);
        	// Rear lip of the "cup"
            translate([0,1.5,h]) rotate([0,90,0]) intersection() {
                cylinder(r=1.5,h=d+(tan(angle)*t));
                hull() { // 5 is just an arbitrary number
                    translate([0,5/2,1.5]) rotate([90,0,0]) cylinder(r=1.5,h=5);
                    translate([0,5/2,d+(tan(angle)*t) -1.5]) rotate([90,0,0]) cylinder(r=1.5,h=5);
                }
            }
        	// Front lip of the "cup"
            translate([0,19+1.5*1.5,h]) rotate([0,90,0]) intersection() {
                cylinder(r=1.5,h=d+(tan(angle)*t));
                hull() { // 5 is just an arbitrary number
                    translate([0,5/2,1.5]) rotate([90,0,0]) cylinder(r=1.5,h=5);
                    translate([0,5/2,d+(tan(angle)*t) -1.5]) rotate([90,0,0]) cylinder(r=1.5,h=5);
                }
            }
            // Front of the "cup"
            //intersection() {
                //cube([d+(tan(angle)*t),19.6,4]);
            //    translate([0,17.75-1.3,1.3]) rotate([0,90,0]) hull() { // 25 is just an arbitrary number
            //        translate([0,25/2,1.3+(tan(angle)*t)]) rotate([90,0,0]) cylinder(r=1.3,h=25);
            //        translate([0,25/2,d+(tan(angle)*t) -1.3]) rotate([90,0,0]) cylinder(r=1.3,h=25);
            //    }
            //}
            // Lip for the front of the "cup"
            //translate([0,19.6-1.3,4]) rotate([0,90,0]) intersection() {
            //    cylinder(r=1.3,h=d+(tan(angle)*t));
            //    hull() { // 5 is just an arbitrary number
            //        translate([0,5/2,1.3+(tan(angle)*t)]) rotate([90,0,0]) cylinder(r=1.3,h=5);
            //        translate([0,5/2,d+(tan(angle)*t) -1.3]) rotate([90,0,0]) cylinder(r=1.3,h=5);
            //    }
            //}
        }
        // note: trackpad rear diameter is 17.75mm.  Render at 19mm to account for PLA shrinkage
        translate([-$o,11.5,9.5+1.5-t+$o]) rotate([0,90,0]) {
            cylinder(r=9.5,h=200);
        }
    }
}

module trackpad_platform(angle, handed) {
    d = (13 * 10) + 3; // 13cm on a side, plus a little fudge for the wall
    t = 1;
    difference() {
        union() {
            difference() {
                // base
                difference() {
                    union() {
                        translate([0,(handed == "right" ? -2 : 0),$o]) difference() {
                            cube([d,d+2,d]);
                            rotate([0,-angle,0]) translate([-$o,-$o,t]) cube([d*2,d*2,d*2]);
                        }
                        // platform walls
                        rotate([0,-angle,0]) union() {
                            if (handed == "right") {
                                translate([0,-2,0]) back_wall(d, angle);
                                lower_wall(d);
                            }
                            else {
                                translate([d+(tan(angle)*2),d+2,0]) rotate([0,0,180]) back_wall(d, angle);
                                translate([3,d,0]) rotate([0,0,180]) lower_wall(d);
                            }
                        }
                    }
                    // front opening under the trackpad
                    translate([cos(angle)*23,(handed == "right" ? d-30 : -5),-$o])
                        cube([cos(angle)*(d-23)-cos(angle)*20, 40, 200]);
                    // @todo need about 2mm more on rear edge
                    // @todo lower edge is too thin (bends). For now, we're just using the old lower_wall variation
                    translate([0,(handed == "right" ? 10+5 : -10+35),-$o]) hull() {
                        for(t = [ [3+cos(angle)*15,0,0],
                                  [3+cos(angle)*15,d-40,0],
                                  [cos(angle)*(d-10)-3,d-40,0],
                                  [cos(angle)*(d-10)-3,0,0]
                                ]) {
                            translate(t) cylinder(r=5,h=d);
                        }
                    }
                    // Tiny cutout on the back wall for the trackpad feet
                    // @todo make this look right, and add for left handed.
	                //rotate([0,-angle,0]) union() {
                    //    translate([-$o,11, t]) rotate([0,90,0]) cylinder(r=1.25,h=200);
					//}
                }
                // Rounded edges
                if (handed == "right") {
                    for (tr=[ [ [0,d,-$o],                    [0,0,-90] ],
                              [ [cos(angle)*d,d,-$o],         [0,0,180] ],
                              [ [cos(angle)*(d-20),d,-$o],    [0,0,-90] ],
                              [ [cos(angle)*(20+3),d,-$o],    [0,0,180] ],
                              [ [cos(angle)*(20+3),d-20,-$o], [0,0,90]  ],
                              [ [cos(angle)*(d-20),d-20,-$o], [0,0,0]   ],
                            ] ) {
                        translate(tr[0]) rotate(tr[1]) round_corner();
                    }
                }
                else {
                    for (tr=[ [ [0,0,-$o],                           [0,0,0]   ],
                              [ [cos(angle)*d,0,-$o],                [0,0,90]  ],
                              [ [cos(angle)*d-cos(angle)*20,0,-$o],  [0,0,0]   ],
                              [ [cos(angle)*(20+3),0,-$o],           [0,0,90]  ],
                              [ [cos(angle)*(20+3),20,-$o],          [0,0,180] ],
                              [ [cos(angle)*d-cos(angle)*20,20,-$o], [0,0,-90] ],
                            ] ) {
                        translate(tr[0]) rotate(tr[1]) round_corner();
                    }
                }
            }
        }
        // Max-width cutoff
        translate([cos(angle)*d,-d/2,-d/2]) cube([d*2,d*2,d*2]);
    }
}

```


[User]
I'm looking to design a T-shaped connector for a rear bike rack. I need it to be fully parametric so I can adjust it to fit different racks and accessories. This connector will be fused with another part.

Here are the parameters I'd like to control:

*   **Screw Hole Spacing:**
    *   `screw_center_horizontal`: Distance from the center of the center screw to the center of a side screw.
    *   `screw_center_vertical`: Distance from the center of the top screw to the center of the bottom screw.

*   **Part Dimensions:**
    *   `thickness`: Overall thickness of the T-connector.
    *   `Ttop_height`: Height of the top part of the T (calculated internally, but I would like to be able to adjust the margin around the screws, which will change it)
    *   `Tver_height`: Height of the vertical part of the T (also calculated internally, based on other parameters)

*   **Screw Head Details:**
    *   `hex_head_radius`: Radius of the hexagonal screw head (half the wrench size).
    *   `hex_head_depth`: Depth of the screw head.
    *   `hex_head_margin`: Margin from the screw head to the edge of the part.
    *   `screw_hole_radius`: Radius of the hole for the screw body.
    *   `hex_head_rotation`: Rotation of the hex head (0 for flat top, 30 for pointy top).
    *   `hex_head_pierce`: How much the hex head hole should pierce the mating part (not used in the connector itself, but it needs to be there for the future).

The connector should have a T shape with four screw holes: one at the top center, one at the bottom center, and one on each side. The screw holes should be designed to accommodate a flat-head (flush) screw using the hex head dimensions.

I’d like the OpenSCAD code to be well-commented for easier understanding and modification later. Could you please generate the necessary OpenSCAD file(s) for this? I don't need any extra libraries, just the standard OpenSCAD stuff.

[Assistant]
rear_rack_v1.scad:
```
/*
T shapped connector for rear bike racks
*/

/* [Rear Rack] */
// distance from center of center screw to center of any side screw
screw_center_horizontal = 25.5;
// distance from center of top screw to center of bottom screw
screw_center_vertical = 18;
// thickness of the part. must be larger than screw head depth as we will try to make screw flush
thickness = 6;
// radius of the screw head. i.e. half of the mm wrench you want to use
hex_head_radius = 4; //[1:12]
// depth of the screw head.
hex_head_depth = 4;
// margin from the screw to the edge of the part
hex_head_margin = 3;
// radius for hole for the screw body, obviously must be smaller than hex_head_radius
screw_hole_radius = 2;
// direction of the hex head (0=flat top, 30=pointy top)
hex_head_rotation = 0; // [0,30]
// how much the hex head hole should pierce trhu the holder part being attached (not usable on this part alone)
hex_head_pierce = 100;

/* [Hidden] */
Ttop_height = 2*hex_head_radius + 2*hex_head_margin;
Tver_height = screw_center_vertical + hex_head_radius+ hex_head_margin + Ttop_height/2;

module T() {
	translate([0,-thickness/2,-Ttop_height/2])
	union(){
		difference() {
			union(){
				// top of the T
				cube(center=true,[screw_center_horizontal*2, thickness, Ttop_height]);
				translate([screw_center_horizontal,0,0]) rotate(a=90,v=[1,0,0])
					cylinder(r=Ttop_height/2+0.05, h=thickness, center=true);
				translate([-screw_center_horizontal,0,0]) rotate(a=90,v=[1,0,0])
					cylinder(r=Ttop_height/2+0.05, h=thickness, center=true);
				// NOTE: the +0.05 on the cylinders above is to remove one artifact when it joing the body. without it, it looked like the radius was smaller than the height of the cube
				// vertical part of T
				translate([0,0,Ttop_height/2-Tver_height/2])
				cube(center=true,[Ttop_height, thickness, Tver_height]);
//translate([0,1,-5]) main();
			}
			// center hole, top
			translate([0,0,0])
				hex_head();
			// center hole, bottom
			translate([0,0,-screw_center_vertical])
				hex_head();
			// right ... yeah, our axis ended up a little off :)
			translate([-screw_center_horizontal,0,0])
				hex_head();
			// left
			translate([screw_center_horizontal,0,0])
				hex_head();
		}
	}
}

/** a sane way to create hexagons. fuck understanding polyhedron syntax at this hour of the night
*/
module hex_head(){
	// logic of this http://hexnet.org/content/hexagonal-geometry
	rotate( a=hex_head_rotation, v=[0,1,0])
	union(){
		translate([0,hex_head_pierce/2+thickness/2-hex_head_depth/2+0.001,0]){
			cube( size = [hex_head_radius,hex_head_pierce+ hex_head_depth+0.001, (hex_head_radius * sqrt(3))], center=true );
			rotate( a=60, v=[0,1,0])
				cube( size = [hex_head_radius, hex_head_pierce+hex_head_depth+0.001, (hex_head_radius * sqrt(3))], center=true );
			rotate( a=120, v=[0,1,0])
				cube( size = [hex_head_radius, hex_head_pierce+hex_head_depth+0.001, (hex_head_radius * sqrt(3))], center=true );
		}

		rotate(a=90,v=[1,0,0])
			translate([0,0,0])
				cylinder(r=screw_hole_radius, h=thickness+0.001+0.001+0.001+0.001, center=true, $fn=99);
				// NOTE: some reason the +0.001 was not working there... 0.004 did the trick, leaving syntax as 0.001 as i will find it with my regexps later
	}
}

T();

```


[User]
Hey, I'm looking to get a parametric OpenSCAD design for a bike light mount that attaches to a rear rack, specifically for a Chinese light with a slide-in holder. I've already got a pretty specific design in mind, so let me walk you through it.

Basically, the mount needs to be a "T" shape where the top of the T attaches to the rear rack using three screws, and the bottom part of the T has the holder for the bike light attached to it.

For the rack attachment part, I need it to be parametric based on the screw hole positions. I need to specify the horizontal distance between the center screw and the side screws, and the vertical distance between the top and bottom screw. I also need to specify the screw head radius and depth and a small margin to ensure that the bolt heads are sunk and don't stick out. I'd also like to set the thickness of the whole T and to define the diameter of the screw holes. I also want to be able to control how much the hex hole pierces through the body when attaching the light holder.  I want the option to rotate the hex head so that it is pointing in different angles (eg, flat or pointy top).

The bike light holder itself is a bit more custom. It needs to have a specific inner width and depth to fit the light's slide-in part. I'll need to specify a part height that's tall enough to reach a latch on the bottom. It also has a small thumb latch on the bottom. I want to control the width of this handle. The walls of the holder should also have a configurable thickness.  I need to be able to set how low the light holder is mounted on the bracket to optimize fit and function.

Essentially, I need to be able to adjust all these dimensions and the design should update accordingly, you know, so I can tweak it to fit my specific bike rack and light. I’m not really expecting to need any libraries beyond what’s in OpenSCAD itself.

Let me know if you have any questions or need me to clarify anything, but it feels like I covered most of the details here.

[Assistant]
rear_rack-chinese_laser.scad:
```
// preview[view:northwest, tilt:bottomdiagonal]

/* [Assembly Settings] */

// how low to put the holder on the bracket. Biggest issue here is to balance the part in a solid position while also benefiting from the cuts next to the latch on the bottom. Too low and it is too loose on the bracket. too high and there is no movement on the latch.
mix_top = 5;

/* [holder chinese laser] */

// min width of the plastic walls.
clf_wall = 2; // plastic walls are 2mm

// we will model the whole thing based on the hole in the middle, since that is all we care about. It should be the measured from the male part on the bike light you want to attach here.
clf_innerWidth = 17.21; // the side to side of the shaft
clf_innerDepth = 3.6; // the depth the shaft
// height does not matter much for the male part, as it will pass trhu the whole part. So just enter a good height so that it reaches the latch on the bottom.
clf_partHeight = 22.75;
// width of the thumb thing for the latch
clf_handle_width = 11.6;

/*
T shapped connector for rear bike racks
*/

/* [Rear Rack] */
// distance from center of center screw to center of any side screw
screw_center_horizontal = 25.5;
// distance from center of top screw to center of bottom screw
screw_center_vertical = 18;
// thickness of the part. must be larger than screw head depth as we will try to make screw flush
thickness = 6;
// radius of the screw head. i.e. half of the mm wrench you want to use
hex_head_radius = 4; //[1:12]
// depth of the screw head.
hex_head_depth = 4;
// margin from the screw to the edge of the part
hex_head_margin = 3;
// radius for hole for the screw body, obviously must be smaller than hex_head_radius
screw_hole_radius = 2;
// direction of the hex head (0=flat top, 30=pointy top)
hex_head_rotation = 0; // [0,30]
// how much the hex head hole should pierce trhu the holder part being attached (not usable on this part alone)
hex_head_pierce = 100;

/* [Hidden] */
Ttop_height = 2*hex_head_radius + 2*hex_head_margin;
Tver_height = screw_center_vertical + hex_head_radius+ hex_head_margin + Ttop_height/2;

module main_part(){
	latch();
	difference(){
		// the main block where we will chip the pieces away
		cube([ clf_innerWidth/2 + clf_wall, clf_innerDepth+clf_wall*2 , clf_partHeight] );
		main_cuts();
	}
}
module latch(){
	// bottom latch
	translate([ 0, 0, -clf_wall ] ){
		cube( [ clf_handle_width/2 -0.5, clf_wall, clf_wall] );
	}
	// the latching block
	translate([ 0, clf_wall, -3-clf_wall ] ){
		cube( [ 5.20/2, 1.15, 3] );
	}
	// the lachking block base
	translate([ 0, 0, -3-clf_wall ] ){
		cube( [ clf_handle_width/2, clf_wall, 3] );
	}
	//handle();
}
module handle(){
	// the handle
	translate([ 0, clf_wall, -3-clf_wall ] ){
		rotate([45, 0, 0])
			difference(){
				cylinder( h=clf_wall, r=clf_handle_width/2);
				color("blue") rotate([0,0,90])
					translate([0, -clf_handle_width/2-0.001,-0.001])
						cube([ clf_handle_width/2+0.002, clf_handle_width+0.002 , clf_handle_width+0.002]);
			}
	}

}

module main_cuts(){
	// the inner shaft
	translate( [ -0.001, clf_wall, -0.001] ){
		cube([ clf_innerWidth/2+0.001, clf_innerDepth, clf_partHeight+0.002] );
	}
	// the front wall opening
	translate( [ -0.001, (clf_wall)+clf_innerDepth-0.001, -0.001] ){
		cube([ clf_innerWidth/2-clf_wall+0.001, clf_wall+0.002, clf_partHeight+0.002] );
	}
	// the two cuts on the side leading to the latch so that it can move back/forth
	translate( [ clf_handle_width/2-0.5, -0.001, -0.001] ){
		cube([ 0.55, clf_wall+0.002, clf_partHeight/3+0.001]);
	}
}

//clf_main();
module clf_main(){
	translate([0,0,-clf_partHeight]){
		main_part();
		actual_mirror();
		handle();
	}
}

// mirror the geometry... why the fuck mirror does not copy? that way it is just an alias to rotate()
module actual_mirror(){
	mirror([10,0,0]){
		main_part();
	}
}
module T() {
	translate([0,-thickness/2,-Ttop_height/2])
	union(){
		difference() {
			union(){
				// top of the T
				cube(center=true,[screw_center_horizontal*2, thickness, Ttop_height]);
				translate([screw_center_horizontal,0,0]) rotate(a=90,v=[1,0,0])
					cylinder(r=Ttop_height/2+0.05, h=thickness, center=true);
				translate([-screw_center_horizontal,0,0]) rotate(a=90,v=[1,0,0])
					cylinder(r=Ttop_height/2+0.05, h=thickness, center=true);
				// NOTE: the +0.05 on the cylinders above is to remove one artifact when it joing the body. without it, it looked like the radius was smaller than the height of the cube
				// vertical part of T
				translate([0,0,Ttop_height/2-Tver_height/2])
					cube(center=true,[Ttop_height, thickness, Tver_height]);

				// ATTACH THE MAIN HOLDER TO THE BRACKET
				// undo the translate above
				translate([0,thickness/2,0])
					// move it down
					translate([0,0,-mix_top])
						// make the rear wall flush
						translate([0,-clf_wall-0.001,0])
							clf_main();
////////////////////////////////////////////////////////////////////////

			}
			// center hole, top
			translate([0,0,0])
				hex_head();
			// center hole, bottom
			translate([0,0,-screw_center_vertical])
				hex_head();
			// right ... yeah, our axis ended up a little off :)
			translate([-screw_center_horizontal,0,0])
				hex_head();
			// left
			translate([screw_center_horizontal,0,0])
				hex_head();
		}
	}
}

/** a sane way to create hexagons. fuck understanding polyhedron syntax at this hour of the night
*/
module hex_head(){
	// logic of this http://hexnet.org/content/hexagonal-geometry
	rotate( a=hex_head_rotation, v=[0,1,0])
	union(){
		translate([0,hex_head_pierce/2+thickness/2-hex_head_depth/2+0.001,0]){
			cube( size = [hex_head_radius,hex_head_pierce+ hex_head_depth+0.001, (hex_head_radius * sqrt(3))], center=true );
			rotate( a=60, v=[0,1,0])
				cube( size = [hex_head_radius, hex_head_pierce+hex_head_depth+0.001, (hex_head_radius * sqrt(3))], center=true );
			rotate( a=120, v=[0,1,0])
				cube( size = [hex_head_radius, hex_head_pierce+hex_head_depth+0.001, (hex_head_radius * sqrt(3))], center=true );
		}

		rotate(a=90,v=[1,0,0])
			translate([0,0,0])
				cylinder(r=screw_hole_radius, h=thickness+0.001+0.001+0.001+0.001, center=true, $fn=99);
				// NOTE: some reason the +0.001 was not working there... 0.004 did the trick, leaving syntax as 0.001 as i will find it with my regexps later
	}
}

T();

```


[User]
I'd like to design a customizable dice, specifically a six-sided die where each face displays a number based on the Fibonacci sequence. I'm thinking 1, 1, 2, 3, 5, and half a circle for the "6" face. The design should use spheres as indentations for the numbers, similar to the included file.

Here are some specific requirements:

*   **Parametric Design:** The die should be parametric, with a variable `size` controlling the overall dimensions of the die. This `size` variable should control the cube's dimensions, the radius of the indentations, and the spacing of the indentations. So if I change `size`, the whole thing should scale up or down accordingly.
*   **Cube Shape:** The base shape of the die should be a cube.
*   **Fibonacci Numbers:** The faces should represent the following numbers: 1, 1, 2, 3, 5, and a semicircle or "half" on one face.
*   **Spherical Indentations:** The numbers should be created using spherical indentations. The size of the spheres for the numbers should be parametric and relative to the size of the die itself.
*   **"Half" Face:** The face representing a "6" should have a "half" circle indentation, basically a semi-sphere. I think the sphere will be on the "inside" of the die, so the "half" shape will be cut from the face, as in the example. This should also be a parametric size based on `size`.
*   **Placement:** The indentations for the numbers should be centered on their respective faces, and use appropriate spacing. The positions of these are similar to a standard die, except with the "half" (or "6") face.
*   **No Special Libraries:** I don't want to use any external libraries for this project, just the built-in OpenSCAD functions.

Could you generate the OpenSCAD code for this design, keeping the code well-commented so it is easy for me to understand?

[Assistant]
parametric_fibonacci_dice.scad:
```
$fn = 100;

// size of the cube
size = 20; // [0:1000]

difference(){

	color("green")
	intersection(){
		cube([1,1,1]*size, true);
		rotate([0,0,0]) cylinder(size+2,.67*size, .67*size, true);
		rotate([0,90,0]) cylinder(size+2,.67*size, .67*size, true);
		rotate([90,0,0]) cylinder(size+2,.67*size, .67*size, true);
		sphere(size*80/100);
	}

//.5
	translate([0,0,size/2])
	rotate([0,0,45])
	difference(){
		sphere(3);
		translate([0,-size*4/50,0])
		cube([size*16/50,size*8/50,size*16/50], center=true);
	}
//6
	for (b=[-size/5,size/5]){
		for (a=[-size/4,0,size/4]){
			translate([b,a,-size/2])
			sphere(2,size*8/100,size*8/100);
		}
	}

	for (a=[-size/7,size/7]){
			//rotate([90,0,0])
			translate([0,a,-size/2])
			sphere(2,size*8/100,size*8/100);
	}

//3
	for (a=[-size/5,0,size/5]){
		rotate([0,90,0])
		translate([a,a,size/2])
		sphere(2,size*8/100,size*8/100);
	}

//2
	for (a=[-size/5,size/5]){
		rotate([0,-90,0])
		translate([a,a,size/2])
		sphere(2,size*8/100,size*8/100);
	}

//5
	rotate([90,0,0])
	translate([0,0,size/2])
	sphere(2,size*8/100,size*8/100);

	for (b=[-size/5,size/5]){
		for (a=[-size/5,size/5]){
			rotate([90,0,0])
			translate([b,a,size/2])
			sphere(2,size*8/100,size*8/100);
		}
	}

// 1
		rotate([-90,0,0])
		translate([0,0,size/2])
		sphere(2,size*8/100,size*8/100);
}
```


[User]
Okay, I'd like a parametric OpenSCAD design for a sewable button battery holder, similar to the one I saw on Thingiverse (thing:250503). But instead of relying on click-fit legs, I want it to screw together. Also, I would like to have two sew holes on the sides that can be used to thread through and push on the positive side of the battery.

Here's what I'm thinking about for parameters:

*   **Battery Type:** I need to be able to specify the battery type, with options like CR2032, AG13, or a "custom" option.
*   **Custom Battery Dimensions:** If I choose "custom", then I'll need to specify the radius and the width of the battery.
*   **Edge Width:** I'd like a parameter for the width of the edges, and it should be a good value for 3D printing (maybe take 2 * nozzle diameter).
*   **Wire Hole Radius:** For the holes for the wires, I need to set the radius.
*   **Sewing Rings:** I need a parameter to control the number of rings at the bottom that I can sew the holder to.
*   **Side Sew Holes:** A boolean toggle to turn the two side sew holes on/off.
*   **Top Sew Holes:** A boolean toggle to turn on/off two sew holes on the top part.
*   **Text Engraving:** I want to engrave text on the top of the holder, and this should be in two lines of text.
*   **Text Dimensions:** Parameters for controlling the width and height of the letters.
*    **Dual print part:**  I need a way to specify if the top, bottom, or both parts should be generated. There should be an option to print both at the same time.
*   **Rack Layout:**  I want to be able to lay out multiple holders in a grid, so parameters for the number of holders in the x and y directions, along with the spacing in each direction.
*    **Build Plate Selection:** I need a parameter for build plate selection, and if manual is selected, x and y dimensions of the build plate should be available to specify.

I'd like the code to use the `MCAD/fonts.scad` library for the text. It would also be great if you could use a `utils/build_plate.scad` library to display the build plate size.  I need to use `search` to get the text indices from `thisFont`.

I think that covers everything. Let me know if you need any more info.

[Assistant]
buttonbatteryscrewsew_v02.scad:
```
// Licence: Creative Commons, Attribution
// Parametrized button battery clip holder

// Thingiverse user by bmcage
// Same idea as http://www.thingiverse.com/thing:48606 but
// parametric

//what button battery should this hold
battery = "CR2032";  //[CR2032, AG13, custom]
//if custom battery, what is radius ?
custom_radius = 10; // [5:30]
//if custom battery, what is width ?
custom_width = 4; // [1:10]
//width of edges, hint: take 2*nozzle diameter of your printer
edge = 0.8;
//radius of the holes for wire
radwire = 1.2;

//how many rings at bottom to sew to
sewrings = 3; //[0:6]
//two sewholes in the sides
sidesew = "true"; //[true, false]
//two sewholes in top part too
topsew = "true";  //[true, false]

use <MCAD/fonts.scad>
//letter to ingrave in the top, first line
letter = "+";
//letter to ingrave in the top, second line
lettersec = "LOVE";

//width of letter
letterwidth = 6; // [1:10]
//height of letter
letterheight = 8; // [1:10]

//Dual print part. Top, bottom, or together. On creation of STL an stl for these 3 parts will be generated.
part = "together"; // [together, top, bottom]

//number in x direction
rack_x = 1;
//distance in rack
rack_dist_x = 60;
//number in y directionuse
rack_y = 1;
//distance in rack
rack_dist_y = 30;

use <utils/build_plate.scad>;

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

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

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

build_plate(build_plate_selector,build_plate_manual_x,build_plate_manual_y);

module test(){
  echo("test");
}

//process the text, we have beta_1 for the symbol, use beta_2 for border!
thisFont=8bit_polyfont();
x_shift=thisFont[0][0];
y_shift=thisFont[0][1];
theseIndicies=search(letter,thisFont[2],1,1);
wordlength = (len(theseIndicies));
theseIndiciessec=search(lettersec,thisFont[2],1,1);
wordlengthsec = (len(theseIndiciessec));

scale_x = letterwidth / x_shift;
scale_y = letterheight / y_shift;
ingrave = edge/4.*3;

//the bottom section
module divider(radius,width) {
  difference() {
    cylinder(r=radius+edge, h=edge+radwire/2,$fn=50);
    translate([-radius/2,1,0]) cylinder(r=radwire, h=edge+10,center=true,$fn=50);
    translate([radius/2,1,0]) cylinder(r=radwire, h=edge+10,center=true,$fn=50);
    translate([-radius/2, 1-radwire,edge]) cube([radius,2*radwire,2*radwire]);
    }
  difference() {
    cylinder(r=radius+2*edge, h=edge+radwire/2+width,$fn=50);
    cylinder(r=radius, h=4*(edge+0.8+width),$fn=50, center=true);
    //translate([0, 2*radius, width+edge+radwire]) cube([4*radius, 4*radius,2*width], center = true);
    }
}

module clip(radius, width, rotated=true){
  //three legs
  for (i=[0:2]){
    rotate([0,0,i*360/3]) {
    translate([radius+edge,-1.5,edge+radwire/2+1])cube([edge,3,2]);
    translate([radius+edge+0.5,-1.5,edge+radwire/2+1]) cube([2,3,(edge+radwire/2)+width]);
    }
  }
  if (rotated){
  for (i=[0:2]){
    rotate([0,0,i*360/3+asin(3./(radius+2.5+edge))-1]) {
    translate([radius+edge,-1.5,edge+radwire/2+1])cube([edge,3,(edge+radwire/2)+width]);
    translate([radius+edge+0.5,-1.5,edge+radwire/2+1]) cube([2,3,(edge+radwire/2)+width]);
    }
  }

  }
}

module letter(Indi){
  for( j=[0:(len(Indi)-1)] )
    translate([-letterwidth/2 + j*(-letterwidth-1),0,0])
    mirror([-1,0,0])scale([scale_x,scale_y,1]){
      translate([-letterwidth/2, -letterheight/2,0])
      linear_extrude(height=ingrave)
        polygon(points=thisFont[2][Indi[j]][6][0],paths=thisFont[2][Indi[j]][6][1]);
      }
}

//top section
module topsection(radius,width) {
  difference() {
    rotate([180,0,0])
    translate([0,0,-(edge+edge+radwire+width+1)])
  union() {
      translate([0,0,edge+edge+radwire+width+1])
      rotate([180,0,0]) difference()   {
        cylinder(r=radius+edge+2, h=edge+radwire/2,$fn=50);
        translate([-radius/2,1,0]) cylinder(r=radwire, h=edge+10,center=true,$fn=50);
        translate([radius/2,1,0]) cylinder(r=radwire, h=edge+10,center=true,$fn=50);
        translate([-radius/2, 1-radwire,edge]) cube([radius,2*radwire,2*radwire]);
        }
      clip(radius, width, false);
    }
  translate([len(theseIndicies)*(letterwidth+1)/2.,letterheight/2+1,-ingrave/10]) letter(theseIndicies);
  translate([len(theseIndiciessec)*(letterwidth+1)/2.,-letterheight/2-1,-ingrave/10]) letter(theseIndiciessec);
  }
    //now some rings to hang it to something
   if (topsew == "true")
    for (i=[0:1]){
      rotate([0,0,i*360/2])
        difference() {
          translate([0,radius+radwire+2*edge,0]) cylinder(r=radwire+2*edge, h=edge+radwire/2,$fn=50);
          translate([0,radius+radwire+2*edge,-0.8]) cylinder(r=radwire, h=2*(edge+0.8),$fn=50);
        }
    }
}

module bottomsection(radius, width){
 difference() {
   union() {
    difference(){
      divider(radius,width);
      clip(radius, width);
    }
    //now some rings to hang it to something
    for (i=[0:sewrings]){
      rotate([0,0,i*360/sewrings])
        difference() {
          translate([0,radius+radwire+2*edge,0]) cylinder(r=radwire+2*edge, h=edge+radwire,$fn=50);
          translate([0,radius+radwire+2*edge,-0.8]) cylinder(r=radwire, h=2*(edge+0.8),$fn=50);
        }
    }
   }
   if (sidesew == "true"){
     translate([0,0,(2*edge+radwire/2+width)/2]) rotate([90,0,70])cylinder(r=radwire, h=4*radius,center=true,$fn=50);
   }
 }
}

//the ensemble
module holder(radius, width) {
  if (part == "together" || part == "top") topsection(radius,width);
  if (part == "together" || part == "bottom")
    translate([2*(radius+4*edge+radwire),0,0]) bottomsection(radius,width);
}

if (battery == "CR2032") {
 translate([-(rack_x-1)/2 * rack_dist_x,-(rack_y-1)/2 * rack_dist_y,0])
 for (i=[1:rack_x]) {
   for (j=[1:rack_y]) {
     translate([(i-1)*rack_dist_x, (j-1)*rack_dist_y, 0])
       holder(10.8, 3.2+1);
   }
 }
}
if (battery == "AG13") {
 translate([-(rack_x-1)/2 * rack_dist_x,-(rack_y-1)/2 * rack_dist_y,0])
 for (i=[1:rack_x]) {
   for (j=[1:rack_y]) {
     translate([(i-1)*rack_dist_x, (j-1)*rack_dist_y, 0])
    holder(6, 6.3+1);
   }
 }
}
if (battery == "custom") {
 translate([-(rack_x-1)/2 * rack_dist_x,-(rack_y-1)/2 * rack_dist_y,0])
 for (i=[1:rack_x]) {
   for (j=[1:rack_y]) {
     translate([(i-1)*rack_dist_x, (j-1)*rack_dist_y, 0])
    holder(custom_radius,custom_width);
   }
 }
}

```


[User]
I'm looking to design a parametric forearm component for an exoskeleton. I have some ideas about the basic shape and how I want to control it, but need a SCAD file (or files if it makes sense) to generate the 3D model.

The main component is a hollow, truncated cone shape. The overall length, radius at the wrist end, radius at the elbow end, and the wall thickness should all be adjustable parameters. I also need a cylindrical joint at the elbow end that is a cut-out within the base cone. This joint's radius needs to be controllable. Finally, I want to cut a portion of the cone in half, so it looks like a 'C' when viewed from the top. The distance of this cut will need to be parametrically controlled. I'd like to be able to adjust how far from the center axis the cut starts, too.

Here are the parameters I was thinking of, with some example ranges:
- `Longitude`: Overall length of the cone (e.g., 20 to 30 units).
- `rad_wrist`: Radius at the wrist end (e.g., 2 to 6 units).
- `rad_elbow`: Radius at the elbow end (e.g., 4 to 10 units).
- `thick`: Wall thickness of the cone (e.g., 0.5 to 5 units).
- `rjoint`: Radius of the cylindrical joint at the elbow end (e.g., 0.5 to 4 units).
- `Rarm`: Distance the cut-out will start from the center axis (e.g. 5 to 30 units)

I'm not sure how best to manage this design in OpenSCAD. It seems like I need to use `difference` to make the hollow cone and cut-out. I would also like it to have a cut in the same plane as the x-axis. I'm thinking a `cube` would work for this.

Could you create the necessary OpenSCAD file(s)? I don't have any specific needs for libraries, though it would be helpful to use any appropriate techniques to keep the code clean and readable. Thanks.

[Assistant]
foreArm.scad:
```
//Variables de creacion.
Longitude=30; // [20:30]
rad_wrist=3; // [2:6]
rad_elbow=6; // [4:10]
thick=1; // [0.5:5]
rjoint=2; // [0.5:4]
Rarm=5; // [5:30]

module Shell(L,r_w,r_e,thick,rj){
difference() {
	translate([0,-L+rj+2,0])rotate([-90,0,0]) cylinder(L,r_w+thick,r_e+thick);
	translate([0,-L+rj+1.9,0])rotate([-90,0,0]) cylinder(L+0.5,r_w,r_e);
}}

//Cono hueco;
//Creamos un cono exterior con un grosor añadido y le quitamos el cono interior.
//Shell(Longitude,rad_wrist,rad_elbow,thick);

//Cortamos por la mitad

/*difference(){
	Shell(Longitude,rad_wrist,rad_elbow,thick,rjoint);
	translate([0,-70,-20])cube([50,100,50]);
	translate([10,0,0])rotate([0,-90,0]) cylinder(20,rjoint,rjoint);
	translate([10-rad_wrist-thick,2,-20])cylinder(50,10,10);
}*/

//translate([rad_wrist+thick+2,2,-40])cylinder(80,10,10);

module Shelly(L,r_w,r_e,thick,rj,rspatial){
	difference(){
		Shell(L,r_w,r_e,thick,rj);
		translate([0,-70,-20])cube([50,100,50]);
		translate([10,0,0])rotate([0,-90,0]) cylinder(20,rjoint,rjoint);
		translate([rspatial-rad_wrist-thick,2,-20])cylinder(50,rspatial,rspatial);
	}
}

Shelly(Longitude,rad_wrist,rad_elbow,thick,rjoint,Rarm);

```