[User]
Okay, I'm looking to generate a customizable sheet of European 4-in-1 chainmaille. I've got a basic OpenSCAD file that does this, but it's not as flexible as I'd like.

Here's what I'm after:

**Core Functionality:**

*   **European 4-in-1 Weave:** The script needs to generate the standard European 4-in-1 pattern, where each ring is linked through four others.
*   **Parametric Design:** I want to be able to easily adjust several key parameters:
    *   `numRows`:  The number of rows of rings in the sheet.
    *   `numCols`: The number of columns of rings in the sheet.
    *   `wireDiameter`: The diameter of the wire used to form the rings (in mm).
    *   `ringAR`: The aspect ratio of the ring (Inner diameter/Wire diameter). This is crucial for the weave to function correctly, and my current code starts to fuse rings together below a value of 3.3. I'd like to avoid this, so if you can come up with a minimum value and/or a warning that would be helpful.
    *   `smoothness`: This controls the smoothness of the rings (number of sides for the approximation of a circle). A higher number means smoother rings but also more processing time.
*   **Staggered Rows:** The rows should be offset, as is typical in 4-in-1, with each row being staggered relative to the one above/below it.
*   **Ring Geometry:** Each ring should be generated using a `rotate_extrude` around a circle. This is how it is done in my example, and it works.

**Specific Requirements/Requests:**

1.  **Robustness:** I'd like to make sure the code works well for a range of `ringAR` values, with a clear recommendation on how low we can go without the rings overlapping/fusing. My current minimum is 3.3, and I'd like that to be handled as well as possible.
2.  **Optimization:** While smoothness is important, I'd also like the code to be reasonably efficient. I would prefer to use a variable for the smoothness value, rather than hardcoding it for any circles or rotate extrudes, to be easily adjusted.
3.  **Modularity:** I'd like the code to be well-structured, making it easy to modify or extend it later, if needed. I'd like the ring generation to be handled within a `module ring(wd, ar)`.
4.  **No Libraries:** I'm not planning to use external libraries, just the standard OpenSCAD functionality.

Basically, I need an improved version of my current script, where the user can modify all the parameters, while ensuring no overlapping rings and efficient rendering.
I'll include my code for reference, but please write me a new script.
```
// preview[view:south, tilt:top]

numRows = 4;
numCols = 4;
// Diameter of ring in mm
wireDiameter = 2;
// Aspect ratio of the ring (Inner diameter/Wire diameter)
// Euro 4:1 has a minimum of 2.9 However, my script starts fusing rings together below 3.3
ringAR = 4;

// Smoothness factor (larger = smoother, but longer to generate stl)
smoothness = 40;

for (i = [1:numRows])
{
	for (j = [1:numCols])
	{
		translate([0,j*(wireDiameter/sin(45)/2+ringAR*wireDiameter/2),0])
		if (abs(i)%2==1)
		{
			rotate([45,0,0])
			translate([(i+1)*(wireDiameter*2+ringAR*wireDiameter)/2, 0, wireDiameter*ringAR/4])
			ring(wireDiameter, ringAR);
		}
		else
		{
			rotate([-45,0,0])
			translate([(i-1)*(wireDiameter*2+ringAR*wireDiameter)/2+(wireDiameter*2+ringAR*wireDiameter), 0, wireDiameter*ringAR/4])
			ring(wireDiameter, ringAR);
		}
	}
}

module ring(wd, ar)
{
	rotate_extrude(convexity = 10, $fn=smoothness)
	translate([ar*wd/2+wd/2, 0, 0])
	circle(r = wd/2, $fn=smoothness);
}
```

[Assistant]
Euro4in1_Customizer.scad:
```
// preview[view:south, tilt:top]

numRows = 4;
numCols = 4;
// Diameter of ring in mm
wireDiameter = 2;
// Aspect ratio of the ring (Inner diameter/Wire diameter)
// Euro 4:1 has a minimum of 2.9 However, my script starts fusing rings together below 3.3
ringAR = 4;

// Smoothness factor (larger = smoother, but longer to generate stl)
smoothness = 40;

for (i = [1:numRows])
{
	for (j = [1:numCols])
	{
		translate([0,j*(wireDiameter/sin(45)/2+ringAR*wireDiameter/2),0])
		if (abs(i)%2==1)
		{
			rotate([45,0,0])
			translate([(i+1)*(wireDiameter*2+ringAR*wireDiameter)/2, 0, wireDiameter*ringAR/4])
			ring(wireDiameter, ringAR);
		}
		else
		{
			rotate([-45,0,0])
			translate([(i-1)*(wireDiameter*2+ringAR*wireDiameter)/2+(wireDiameter*2+ringAR*wireDiameter), 0, wireDiameter*ringAR/4])
			ring(wireDiameter, ringAR);
		}
	}
}

module ring(wd, ar)
{
	rotate_extrude(convexity = 10, $fn=smoothness)
	translate([ar*wd/2+wd/2, 0, 0])
	circle(r = wd/2, $fn=smoothness);
}
```


[User]
Okay, I'm trying to design a support for my gate valves. I have a bunch of these Valterra 3" PVC gate valves, and they have this annoying habit of not staying open on their own. I need a little snap-on support that I can easily attach and remove.

I've tried to start with some code, but I think I need a more parametric approach. I'm aiming for something that can be easily adjusted for different valve stem sizes, support lengths, and wall thicknesses.

Here's what I've got so far (it's not very parametric and I think it can be improved):

```
// Stem Diameter
d = 6.3;
// Support Length
l = 70;
// Support Thickness
t = 2;

$fa = 0.1;
$fs = 0.1;

difference() {
	cube([l, d + (2 * t), d + t]);
	translate([t, t, t])
	cube([l - (2 * t), d, d + 0.1]);
	rotate([0, 90, 0])
	translate([-t - (d / 2), t + (d / 2), -0.1])
	cylinder(r = d / 2, h = l + 0.2);
	rotate([0, 90, 0])
	translate([-t - d - 1, t + (d / 2), -0.1])
	cylinder(r = d / 2, h = l + 0.2);
}
```

My basic idea is a sort of "C" shape that fits around the stem of the valve and uses some friction to stay in place. The current code creates a rectangular prism with another smaller prism and two cylinders subtracted out. I'd like to be able to adjust:

*   **`stem_diameter`:** This is the diameter of the valve stem that the support will snap onto. My current value is 6.3mm.
*   **`support_length`:** The overall length of the support. Right now it's 70mm.
*   **`support_thickness`:** The thickness of the support material. My current value is 2mm.
*   **`snap_gap`:** How much space there is in the "C" gap that will clip onto the stem. I think this needs to be slightly smaller than the stem diameter to get a good snap fit. Maybe 0.2 or 0.3mm less? This might need to be a variable we can experiment with.
*   **`outer_width`:** The total width of the support. I think it might be nice to have this as a variable.
*   **`outer_height`:** The total height of the support. Same as above.
*   **`tolerance`:** A small value that will be added or subtracted from various dimensions to get the fit just right - I'm guessing it'll be something like 0.1, 0.2, etc.

I would like it to be fully parametric, so these values can be modified through the Customizer. I'd like to use a more elegant method than just a bunch of cubes and cylinders. It would be great if the code could use the `linear_extrude` and `hull` modules from the BOSL2 library to make the shape smoother and easier to reason about.

Can you help me generate a more robust and flexible OpenSCAD file using BOSL2? I think it would be helpful to include comments in the code to help me understand what each part is doing.

[Assistant]
Gate_Valve_Support.scad:
```
// Stem Diameter
d = 6.3;
// Support Length
l = 70;
// Support Thickness
t = 2;

$fa = 0.1;
$fs = 0.1;

difference() {
	cube([l, d + (2 * t), d + t]);
	translate([t, t, t])
	cube([l - (2 * t), d, d + 0.1]);
	rotate([0, 90, 0])
	translate([-t - (d / 2), t + (d / 2), -0.1])
	cylinder(r = d / 2, h = l + 0.2);
	rotate([0, 90, 0])
	translate([-t - d - 1, t + (d / 2), -0.1])
	cylinder(r = d / 2, h = l + 0.2);
}
```


[User]
Okay, I'm looking to design a customizable friendship heart charm that I can 3D print. I'd like the design to be parametric, so I can easily change the size and other features.

Here's what I'm envisioning:

**Shape:** The charm should be in the shape of a heart, constructed from two semi-circles and a tilted square like in the code provided.

**Customization:**

*   **Size:** I want to be able to control the overall size of the heart. I'd like to specify an approximate width of the heart, and have the rest of the dimensions scale accordingly. I was thinking something like "Small", "Medium", and "Large" corresponding to widths of around 15mm, 30mm, and 50mm, respectively, or I should be able to input the size directly.
*   **Initials:** I'd like to add an initial on each side of the heart. These should be single letters. I need to be able to specify both the left and right initials independently.
*   **Font:** I want to be able to choose the font for the initials from a predefined list (I really liked the options in the code provided) . Specifically, I'd like to be able to choose from Letters, Orbitron, Knewave, Blackrose, and Braille.
*   **Thickness:** I need to be able to control the thickness of the heart, but this doesn't necessarily need to be a high level, customizable parameter. A default value of 2.5mm is fine, but it would be great if it was adjustable in a settings section.
*   **Hanging holes:** I would like there to be two holes near the top of the heart for a string or keyring. These should also scale with the size of the heart and ideally will not interfere with the letters if a braille font is chosen.

**Libraries:**

I see that the provided code uses some functions from a "Write.scad" and a "write/Write.scad" library. I'm assuming these are where the text rendering functionality is coming from, and I'd like to use these libraries again. I think the fonts are stored as DXF files which are imported by that library.

**Specifics from provided code:**

The provided code used a few specific dimensions based on `w`, and a number of variables related to the tilt and position of the tilted square: `lx`, `ly`, `diag`, `c2x`, `c2y`, `c3x`, and `c3y`. I'd prefer these to be handled automatically from a single input `w` (or `heart_size`), to make the design simpler to adjust.

**What I'm looking for:**

I need a single parametric OpenSCAD file that incorporates all of the above, so I can easily generate variations of the charm. The goal is to create a customizable heart that would be suitable for printing as a friendship charm. I'd like it to be clear which variables are used for each customization and easily adjustable in a settings section.

[Assistant]
Heart-5.scad:
```
use <write/Write.scad>
use <Write.scad>

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

/* [global] */
//Approx width of the heart. Small: 15mm / Medium: 30mm / Large: 50mm
heart_size = 30; // [10:Small,20:Medium,30:Large]

//For initials, this is meant for one letter only.
left_initial = "L";
right_initial = "R";
w=heart_size;
//l=20;

//Select font.
your_font = "write/Letters.dxf"; // ["write/Letters.dxf":Letters,"write/orbitron.dxf":Orbitron,"write/knewave.dxf":Knewave,"write/BlackRose.dxf":Blackrose, "write/braille.dxf":Braille]

/* [hidden] */
thickness = 2.5;
h=0;

lx = (sqrt((w*w)/2));
ly = 1.5*(sqrt((w*w)/2));
diag = sqrt(2*w*w);
c2x=.85*lx;
c2y=.80*ly;
c3x=1.15*lx;
c3y=.60*ly;

$fn=150;

module heart() {
translate([.5*(sqrt((w*w)/2)),1.5*(sqrt((w*w)/2)),h]) circle(w/2);
translate([1.5*(sqrt((w*w)/2)),1.5*(sqrt((w*w)/2)),h]) circle(w/2);
translate([sqrt((w*w)/2),0,0]) rotate([0,0,45]) square([w,w]);
}

module rightSquare() {
polygon( [ [(lx),(1.2*diag)],[(lx),(.75*diag)],[c2x,c2y],[c3x,c3y],[(lx),(.30*diag)],[(lx),(-2)],[(2.5*lx),(-2)],[(2.5*lx),(1.2*diag)] ] , [ [0,1,2,3,4,5,6,7,8] ]);
}

module leftSquare() {
polygon( [ [(lx),(1.2*diag)],[(lx),(.75*diag)],[c2x,c2y],[c3x,c3y],[(lx),(.30*diag)],[(lx),(-2)],[(-20),(-2)],[(-20),(1.2*diag)] ] , [ [0,1,2,3,4,5,6,7,8] ]);
}

module leftSection() {
difference() {
heart();
rightSquare();
}

}

module rightSection() {
difference() {
heart();
leftSquare();
}

}

linear_extrude(height = thickness) leftSection();
translate([5,0,0]) linear_extrude(height = thickness) rightSection();

//difference() {

//linear_extrude(height = thickness) heart();
//jaggedLine();

//}

if (heart_size == 10) {

translate([(.2*lx),(.6*diag),thickness-.01]) write(left_initial,t=.75,h=5,center=false, font=your_font);
translate([((1.35*lx)+5),(.6*diag),thickness-.01]) write(right_initial,t=.75,h=5,center=false, font=your_font);

} else if (heart_size == 20) {

translate([(.2*lx),(.6*diag),thickness-.01]) write(left_initial,t=1,h=10,center=false, font=your_font);
translate([((1.35*lx)+5),(.6*diag),thickness-.01]) write(right_initial,t=1,h=10,center=false, font=your_font);

} else if (heart_size == 30) {

translate([(.2*lx),(.6*diag),thickness-.01]) write(left_initial,t=1,h=13,center=false, font=your_font);
translate([(1.35*lx)+5,(.6*diag),thickness-.01]) write(right_initial,t=1,h=13,center=false, font=your_font);

}

difference() {
translate([(.4*lx),(1.15*diag),0]) cylinder((.5*thickness),3,3);
translate([(.4*lx),(1.15*diag),-1]) cylinder((thickness),1.5,1.5);

}

difference() {
translate([(1.6*lx)+5,(1.15*diag),0]) cylinder((.5*thickness),3,3);
translate([(1.6*lx)+5,(1.15*diag),-1]) cylinder((thickness),1.5,1.5);

}

```


[User]
Okay, I'd like to design a friendship charm that's a square with rounded corners, and it splits into two pieces. I want to be able to customize it with different sizes, initials on each side, and different fonts for those initials. I'm envisioning a bevel on each half where the pieces meet and a hole on the top of each piece for a keychain or cord.

Here's a breakdown of what I need:

*   **Shape:** A square with rounded corners, similar to a rounded rectangle. The overall design should split into two identical pieces.

*   **Size:** I need a parameter to control the overall size of the square, with options for small, medium, and large.  I'd like it if we could keep this as mm like the original and use 15mm, 20mm, and 30mm as the size options.

*   **Bevel:** A bevel should be implemented on the inner edges of each charm piece to create a nice fit when put together. This is not a full-round chamfer; instead, it's an offset of the main shape, leaving a small lip around the edge. The width of this lip should be adjustable, if possible.

*   **Initials:** I want to put a single letter on each half of the charm. These letters should be customizable, and I should be able to select the font. I want to be able to choose between a few fonts from the Write library -- specifically "Letters.dxf", "orbitron.dxf", "knewave.dxf", "BlackRose.dxf", and "braille.dxf".

*   **Holes:** Each half of the charm needs a small hole on top to attach it to a keychain, cord, or similar. The location of this hole relative to the corners of the square should be adjustable if we can.

*   **Extrusion:** The entire design will be extruded to a specific height, and I'd like that height to be parametric as well. The thickness of the beveled inner section should be slightly less, so it nestles into the outer extrusion.

*   **Libraries:** I would like to use the "Write.scad" library for the letters. I already have this in my project folder.

Could you write the OpenSCAD code for this? I'd really appreciate it!

[Assistant]
charmRectangle-5.scad:
```

use <write/Write.scad>
use <Write.scad>

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

/* [global] */
//Width of the square. Small: 15mm / Medium: 20mm / Large: 30mm
size = 20; // [15:Small,20:Medium,30:Large]

//For initials, designed for one letter only.
left_initial = "L";
right_initial = "R";

//Select font.
your_font = "write/Letters.dxf"; // ["write/Letters.dxf":Letters,"write/orbitron.dxf":Orbitron,"write/knewave.dxf":Knewave,"write/BlackRose.dxf":Blackrose, "write/braille.dxf":Braille]

/* [hidden] */
w = size;
r = 5;
w2 = .93*size;
r2 = .93*r;
thickness = 2.5;
$fn=150;

lx = w/2;
ly = w/2;
diag = w;
c2x=.85*lx;
c2y=.60*w;
c3x=1.15*lx;
c3y=.40*w;

module base() {
translate([r,r,0]) circle(r);
translate([r,(w-r),0]) circle(r);
translate([(w-r),r,0]) circle(r);
translate([(w-r),(w-r),0]) circle(r);
translate([r,0,0]) square([(w-2*r),(w)]);
translate([0,r,0]) square([(w),(w-2*r)]);
}

module innerBase() {
translate([r2,r2,0]) circle(r2);
translate([r2,(w2-r2),0]) circle(r2);
translate([(w2-r2),r2,0]) circle(r2);
translate([(w2-r2),(w2-r2),0]) circle(r2);
translate([r2,0,0]) square([(w2-2*r2),(w2)]);
translate([0,r2,0]) square([(w2),(w2-2*r2)]);
}

module jaggedLine() {
linear_extrude(height = thickness+10, center = true) polygon( [ [(lx-.2),(w+2)],[(lx-.2),(.75*w)],[c2x,c2y],[c3x,c3y],[(lx-.2),(.20*w)],[(lx-.2),(-2)],[(lx+.2),(-2)],[(lx+.2),(.20*w)],[(c3x+.4),(c3y)],[(c2x+.4),(c2y)],[(lx+.2),(.75*w)],[(lx+.2),(w+2)] ] , [ [0,1,2,3,4,5,6,7,8,9,10,11] ]);
}

module rightSquare() {
polygon( [ [(lx),(1.2*diag)],[(lx),(.75*diag)],[c2x,c2y],[c3x,c3y],[(lx),(.30*diag)],[(lx),(-2)],[(2.5*lx),(-2)],[(2.5*lx),(1.2*diag)] ] , [ [0,1,2,3,4,5,6,7,8] ]);
}

module leftSquare() {
polygon( [ [(lx),(1.2*diag)],[(lx),(.75*diag)],[c2x,c2y],[c3x,c3y],[(lx),(.30*diag)],[(lx),(-2)],[(-20),(-2)],[(-20),(1.2*diag)] ] , [ [0,1,2,3,4,5,6,7,8] ]);
}

module leftSection() {
difference() {
base();
rightSquare();
}

}

module rightSection() {
difference() {
base();
leftSquare();
}

}

difference() {

linear_extrude(height = thickness) leftSection();
translate([(.035*w),(.035*w),1.5]) linear_extrude(height = thickness-1.10) innerBase();

}

difference() {

translate([5,0,0]) linear_extrude(height = thickness) rightSection();
translate([(.035*w)+5,(.035*w),1.5]) linear_extrude(height = thickness-1.10) innerBase();

}

if (w == 15) {

translate([(.10*w),(.28*w),1.49]) write(left_initial,t=.75,h=7,center=false, font=your_font);
translate([(.63*w)+5,(.28*w),1.49]) write(right_initial,t=.75,h=7,center=false, font=your_font);

} else if (w == 20) {

translate([(.10*w),(.28*w),1.49]) write(left_initial,t=1,h=9,center=false, font=your_font);
translate([(.63*w)+5,(.28*w),1.49]) write(right_initial,t=1,h=9,center=false, font=your_font);

} else if (w == 30) {

translate([(.10*w),(.3*w),1.49]) write(left_initial,t=1,h=13,center=false, font=your_font);
translate([(.63*w)+5,(.3*w),1.49]) write(right_initial,t=1,h=13,center=false, font=your_font);

}

difference() {
translate([(.25*w),(1.06*w),0]) cylinder((.5*thickness),3,3);
translate([(.25*w),(1.06*w),-1]) cylinder((thickness),1.5,1.5);

}

difference() {
translate([(.75*w)+5,(1.06*w),0]) cylinder((.5*thickness),3,3);
translate([(.75*w)+5,(1.06*w),-1]) cylinder((thickness),1.5,1.5);

}

```


[User]
Okay, I'm trying to design a chain in OpenSCAD, and I'd like some help making it more parametric and flexible. Right now, I've got a basic script that creates a chain of oval links, but it's a little clunky and I want more control over its shape and construction.

Here’s what I have in mind:

**Overall Goal:** I want a modular OpenSCAD script that generates a chain of interlinked oval links. The chain should be configurable in terms of:

1.  **Number of links:** The total number of links in the chain.
2.  **Link Dimensions:**
    *   **Link Radius:**  The base radius of the link (before oval scaling).
    *   **Link Ovality:** A factor to control how squished the link becomes into an oval. For instance, I've been using a factor of 1.5 for the y-scale to get an oval shape but I'd rather be able to specify an ovality to scale on the y axis and a z axis.
    *   **Link Thickness:** The overall thickness of the link, and perhaps an option to specify the inner thickness.
3.  **Link Beveling:**
    *   **Bevel Size:**  The radius of a sphere used for beveling. I want the beveling to be an option and not just a binary on/off thing but I'd also like to avoid weird overlapping if the user chooses too large of a bevel.
4. **Chain Arrangement:**
    * **Link Rotation:** the rotation of the base link and the nested link within `chain_link`, and how those two links connect.
    * **Chain Radius:** the radius from which the chain links sit from the center
    * **Looping:** whether the chain forms a circle, or just a simple chain of links.

**Specific Features I'd Like:**

*   **Modular Design:** The code should be broken down into well-defined modules (e.g., `base_link`, `bevel_link`, `oval_link`, `chain_link`, `chain`).  I want to easily modify any specific link type or arrangement without needing to rewrite a lot of code.
*   **Parametric:**  All of the parameters listed above should be easily changeable at the top of the script.
*   **Clear and Readable Code:** I'm not an expert OpenSCAD programmer, so comments and clear variable names would be greatly appreciated.
*   **No libraries necessary:** I am not looking for any library dependencies like MCAD, BOSL, or anything else.

**My Current Attempt (For Reference):**

```
$fn=10;

// Radius of a single link before it's turned into an oval.
link_radius = 100;

// Number of links in your chain.
number_of_links= 14;

// Amount to bevel the edges. 0 means no bevel.
bevel_size = .1;

chain(number_of_links, link_radius, bevel_size);

module base_link(radius) {
	difference() {
		cylinder(h=radius * .5, r=radius, center=true);
		cylinder(h=radius * 1.1, r=radius *.85, center=true);
	}
}

module bevel_link(ring_radius, size) {
	minkowski() {
		base_link(ring_radius);
		sphere(ring_radius * size);
	}
}

module oval_link(radius, bevel) {
	if (bevel == 0) {
		scale([1, 1.5, .5]) base_link(radius);
	}
	if (bevel != 0) {
		scale([1, 1.4, .5]) bevel_link(radius, bevel);
	}
}

module chain_link(radius, bevel) {
	rotate([0, -22.5, 0]) translate([0, -(radius*.5), 0]) {
		rotate([0, 0, 10]) oval_link(radius);
		rotate([0, 45, -10]) {
			translate([0, radius*1.5, -3]) oval_link(radius, bevel);
		}
	}
}

module chain(links, link_radius, bevel) {
	loop = links/2;
	for (i = [1:1:loop]) {
		rotate([0, 0, i*360/loop]) translate([-link_radius*(loop/2), 0, 0]) {
			chain_link(link_radius, bevel);
		}
	}
}
```

This code creates a basic chain, but it lacks the flexibility and control I'm looking for, particularly regarding the ovality and thickness. I'd like to be able to control the oval scaling on both the y and z axis independently. I'd also like to avoid using a `if` statement for beveling.

Can you help me build a more advanced parametric chain generator based on these requirements?

[Assistant]
chain.scad:
```
$fn=10;

// Radius of a single link before it's turned into an oval.
link_radius = 100;

// Number of links in your chain.
number_of_links= 14;

// Amount to bevel the edges. 0 means no bevel.
bevel_size = .1;

chain(number_of_links, link_radius, bevel_size);

module base_link(radius) {
	difference() {
		cylinder(h=radius * .5, r=radius, center=true);
		cylinder(h=radius * 1.1, r=radius *.85, center=true);
	}
}

module bevel_link(ring_radius, size) {
	minkowski() {
		base_link(ring_radius);
		sphere(ring_radius * size);
	}
}

module oval_link(radius, bevel) {
	if (bevel == 0) {
		scale([1, 1.5, .5]) base_link(radius);
	}
	if (bevel != 0) {
		scale([1, 1.4, .5]) bevel_link(radius, bevel);
	}
}

module chain_link(radius, bevel) {
	rotate([0, -22.5, 0]) translate([0, -(radius*.5), 0]) {
		rotate([0, 0, 10]) oval_link(radius);
		rotate([0, 45, -10]) {
			translate([0, radius*1.5, -3]) oval_link(radius, bevel);
		}
	}
}

module chain(links, link_radius, bevel) {
	loop = links/2;
	for (i = [1:1:loop]) {
		rotate([0, 0, i*360/loop]) translate([-link_radius*(loop/2), 0, 0]) {
			chain_link(link_radius, bevel);
		}
	}
}
```


[User]
Okay, I'm looking to design a magnetic pen holder for my fridge and I want it to be fully customizable. I've got a basic design in mind, but I need an OpenSCAD file that can handle some parametric changes.

Here’s what I’m envisioning:

**Overall Function:** The holder will stick to my fridge using embedded magnets and will hold a pen vertically.

**Key Parameters:**

*   **`total_height`:**  The total height of the pen holder. This should be adjustable, probably between 0 and 100mm.
*   **`pen_diameter`:**  The diameter of the pen that the holder needs to accommodate. I’ll need to be able to change this from maybe 5mm to 50mm.
*   **`magnet_diameter`:** The diameter of the magnets I'll be using. This needs to be adjustable as I might use different magnets, but must be smaller than or equal to the `pen_diameter`.  I'd like to be able to specify this between 1mm and 20mm.
*   **`magnet_height`:** The height of the magnets I’m using. This value will also determine the thickness of the back wall of the holder since the magnets will sit in recesses there. This should be adjustable from 1mm to 20mm as well.

**Design Details:**

*   **Shape:**  The holder should have a cylindrical shape to hold the pen. The front of the holder will have a cut-out to accommodate the pen, and the back of the holder will have two recesses for the magnets.
*   **Wall Thickness:** The outer wall of the cylindrical part should have a thickness of 2mm.
*   **Magnet Recesses:** The magnet recesses should be sized to fit the magnets, and should have a bit of extra space for ease of insertion (maybe 0.25mm extra radius, or so). The recesses should be located at the top and bottom of the back wall.
*   **Orientation:** The holder is meant to be printed as a vertical cylinder standing on the magnet side, so the magnetic part is at the back. I'd like it if the final file is in that orientation already.

**Customizer:** I need all of these parameters to be exposed in the OpenSCAD customizer.

**Libraries:** I'm not requesting any external libraries for this design. I'm expecting this to be achievable with just the built-in functions of OpenSCAD.

Could you please generate the OpenSCAD file for me with these specifications? Thanks!

[Assistant]
parametric_magnetic_fridge_holder.scad:
```
//All units in mm.

//Total height of the holder.
total_height=50; //[0:100]

//Diameter of the pen.
pen_diameter=10; //[5:50]

//Diameter of the magnets. Must not be larger than the pen diameter!
magnet_diameter=10; //[1:20]

//Height of the magnets. This also changes the thickness of the back wall.
magnet_height=1; //[1:20]

//Calculate outer wall (2mm)
outer_diameter=pen_diameter+4;

rotate([0,0,-90])
difference()
{
difference()
{
linear_extrude(height=total_height,convexity=10)
union()
{
circle(r=(outer_diameter/2), $fn=64);
translate([-(outer_diameter/2),0,0])
square([outer_diameter,magnet_height+(outer_diameter/2)]);
}

translate([0,0,2])
linear_extrude(height=total_height,convexity=10)
circle(r=(pen_diameter/2)+0.5, $fn=64);
}

translate([0,outer_diameter/2,(magnet_diameter/2)+2])
rotate([-90,0,0])
cylinder(h=magnet_height+1,r=(magnet_diameter/2)+0.25,$fn=32);

translate([0,outer_diameter/2,total_height-((magnet_diameter/2)+2)])
rotate([-90,0,0])
cylinder(h=magnet_height+1,r=(magnet_diameter/2)+0.25, $fn=32);

}

```


[User]
Okay, I'm looking for a design for a simple but useful tool: a clip to hold a zip lock bag onto the edge of a table, acting as a temporary trash receptacle. I've already got a basic design in mind, but I'd like you to create a parametric OpenSCAD file for me.

Here's what I'm after:

*   **Functionality:** The clip should secure a zip lock bag to the underside of a table, allowing debris to be easily brushed into the open bag from the tabletop.
*   **Basic Structure:** The design consists of a few main parts:
    *   A base that sits against the underside of the table, providing a flat surface for the clip to push against.
    *   A main clamping body that extends over the edge of the table and provides the force to hold the bag. It needs a cutout at the end to allow a bag to be looped into the gap.
    *   A secondary clamp that helps grip the bag after looping it through the cutout on the main body.
*  **Parametric Design:** I want this to be adjustable for different table thicknesses. The following parameters should be configurable:
    *   `table_thickness`: The thickness of the table the clip is intended for (in millimeters).
    *   `bag_clip_width`: The total width of the main clamp for the bag loop.
    *   `main_clamp_depth`: How far the main body extends from the bottom of the table. This should be bigger than the table thickness.
    *  `secondary_clamp_width`: Width of the secondary clamp.
    * `secondary_clamp_depth`: How far the secondary clamp should extend from the main clamp.

*   **Specific Design Aspects:**
    *   The secondary clamping piece doesn’t need to be as wide as the main body.
    *   There should be a cutout, like a slot, in the main clamping body that the bag lip can be looped through, this cutout should not extend to the outer edge of the clamp.
    *   The bag needs to be held tight and there must be space for the bag to be placed between the body and the secondary clamp.
    *   The base shouldn’t have any overhang on the table so it needs to only extend to the edge of the table.
    *   The clip needs to be reasonably sturdy when printed in PLA.
*   **OpenSCAD Libraries:** I don't need any external libraries for this, but I'd prefer that it be formatted in a clear way.
*  **Units:** Use millimeters for all measurements.

I want to make it easy to adjust the design if needed, or to easily print it for different tables, so making it fully parametric would be great. Could you generate the OpenSCAD code based on this description?

[Assistant]
Table_Bag_Clip.scad:
```
//table thickness in mm
t=16.5;

translate([0,0,0])cube([2,70,3]);
difference() {
	cube([t+25,40,3]);
	translate([t,2,-1])cube([31,1,5]);
	translate([t+25,23,-1])cylinder(r=16,h=5);
}
translate([t+2,40,0]) cube([4,30,10]);
difference() {
	translate([t+2,40,0]) cube([23,6,3]);
	translate([t+5,43,-1])cube([30,1,5]);

}

```


[User]
Okay, I need a custom keyboard music stand designed, and I'd like to be able to adjust it for different keyboards. I've got a good idea of what I want, and I even have an existing design that I can describe, but I need a parametric OpenSCAD file that I can easily tweak.

Essentially, the stand consists of a flat plane that holds the sheet music, supported by rods that attach to the keyboard via holes. Here's the breakdown of what I need and how it should be customizable:

**Overall Structure:**

*   **Plane:** The main flat surface for the music.
    *   **`plane_width`**:  The width of the plane.
    *   **`plane_height`**: The height of the plane.
    *   **`tilt`**: The angle of the plane relative to the keyboard, adjustable in degrees.
*   **Rods:** Support structure using rods.
    *   **`rod_d`**: Diameter of the support rods (excluding the ones that go into the keyboard).
    *   **`rod_d_keyboard`**: Diameter of the rods that fit into the keyboard's holes.
*   **Keyboard Attachment:**
    *   **`keyboard_holes_distance`**: The distance between the two holes on the keyboard where the stand attaches.
    *   **`keyboard_holes_length`**: The length of the rod that inserts into the keyboard holes.

**Detailed Features:**

*   **Corners:** The corners of the stand should be slightly rounded for aesthetics and safety.
    *   **`corner_diameter`**: The overall diameter/sharpness of the rounded corner.
    *   **`corner_width`**: The thickness of the corner piece.
    *   **`corner_length`**: The length of the corner piece, effectively its size along the plane.
*   **Base:** There should be a small ledge at the bottom of the plane to help keep the sheet music from sliding off.
    *  **`base_width`**: The depth of the base/ledge.
*   **Stabilization:** Additional supports for stability.
    *   **`stabilize_length`**: The length of the support angles at the bottom of the base.
*   **Rod Spacing:** The ends of the rods should be slightly inset.
    *   **`space`**: Distance from the rod-ends to the intersection of the plane and side rods.

**Parametric Design Needs:**

*   I want the whole thing to be parametric, so I can change any of the values above to fit different keyboards.
*   The design should calculate the correct lengths for the diagonal rods based on the `plane_width` and `plane_height` values.
*   The rods should have holes cut out for them in the plane and base.
*   I need the ability to toggle the visibility of the rods, corners, and the base through the variables `show_rods`, `show_corners`, and `show_base`.

**Extra Notes:**

*   I plan to use 4mm diameter eloxed aluminium rods (if you're wondering, I'm using a Fame Stage SP as a base reference) for the main rods and also for the rods that insert into the keyboard.
*   I want the design to be easily printable.
*   I'd like the model to use `$fn = 30` for the circles.

**Libraries:**

I'm not expecting any specialized libraries, just the standard OpenSCAD primitives and functionality.

Can you create a parametric OpenSCAD file that does all of this?

[Assistant]
Keyboard_music_stand.scad:
```
// Customizeable Keyboard music stand - Design by Dominik Platz 08.09.2013
// Default values are for a Fame Stage SP

// User-defined parameters
//-------------------------

keyboard_holes_distance = 430;

// lengths of plane and rods
plane_width = 430;
plane_height = 300;
keyboard_holes_length = 28.5;

rod_d = 4; // diameter of rods
rod_d_keyboard = 4; // diameter of rods into Keyboard

tilt = 15; // angle of plane tilt in °

corner_diameter = 10; // corner "sharpness"
corner_width = 10;	// corner thickness
corner_length = 30; // corner size in plane
base_width = 20;	// place for the notes
stabilize_length = 30;	// length for the support angles on the bottom

// Parameters for me
space = 10; // Distance from the rod-ends to the intersection
$fn = 30;
diagonal_rod_angle = atan(plane_width / plane_height);
diagonal_rod_length = sqrt(plane_width*plane_width/4 + plane_height*plane_height/4);
real_diagonal_rod_length = diagonal_rod_length-space*2;
real_side_rod_length = plane_height-space*2;
real_bottom_rod_length = plane_width-space*2;

// View-settings
show_rods = false;
show_corners = true;
show_base = true;

translate([0,0,corner_width])
rotate([90-tilt,0,0])
if(show_rods == true)
{
 		rods();
}

translate([0,0,corner_width])
rotate([90-tilt,0,0])
difference()
{
	union() {
		if(show_base == true)
		{
			base();
		}
		if(show_corners == true)
		{
			corners();
		}
	}
	union()
	{
		rods();
		translate([plane_width/3,0,0])
		cube([0.1,1000,1000], center=true);
		translate([plane_width/3*2,0,0])
		cube([0.1,1000,1000], center=true);
	}

}

module base()
{
	// left, right arm
	for (i = [0,plane_width])
	{
	hull()
	{
		rotate([tilt,0,0])
		translate([i,-corner_width+0.5,0])
		rotate ([90,0,0])
		cylinder(h = 1, r = corner_diameter/2, center = true);

		translate([i,base_width-0.5,0])
		rotate ([90,0,0])
		cylinder(h = 1, r = corner_diameter/2, center = true);

		rotate([tilt,0,0])
		translate([i,-corner_width+0.5,25])
		rotate ([90,0,0])
		cylinder(h = 1, r = corner_diameter/2, center = true);

		translate([i,base_width-0.5,25*(1+sin(tilt))])
		rotate ([90,0,0])
		cylinder(h = 1, r = corner_diameter/2, center = true);
	}
	}

// plattform

	hull()
	{
		for (i = [0,plane_width])
		{
			rotate([tilt,0,0])
			translate([i,-corner_width+0.5,25-corner_diameter/4])
			rotate ([90,0,0])
			cylinder(h = 1, r = corner_diameter/4, center = true);

			translate([i,base_width-0.5 + 0*base_width*sin(tilt),25*(1+sin(tilt))-corner_diameter/4])
			rotate ([90,0,0])
			cylinder(h = 1, r = corner_diameter/4, center = true);
		}
	}

// back

	hull()
	{
		for (i = [0,plane_width])
		{
			rotate([tilt,0,0])
			translate([i,0,25])
			rotate ([90,0,0])
			cube([1,5,corner_width]) ;
		}
	}

stabilize_angle(1);
translate([keyboard_holes_distance,0,0]) stabilize_angle(1);

// middle stabilize_angle
	translate([keyboard_holes_distance/2,0,30])
	{
		hull()
		{
			rotate([tilt,0,0])
			translate([0,-corner_width+0.5,-corner_diameter/2*(1+sin(tilt))])
			rotate ([90,0,0])
			cylinder(h = 1, r = 2.5, center = true);

			translate([0,base_width-0.5,-corner_diameter/2*(1-sin(tilt))])
			rotate ([90,0,0])
			cylinder(h = 1, r = 2.5, center = true);

			translate([0,base_width-0.5,-40])
			rotate ([90,0,0])
			cylinder(h = 1, r = 2.5, center = true);

	}

	}
}

module stabilize_angle(lenght)
{
	hull()
	{
		rotate([tilt,0,0])
		translate([0,-corner_width+0.5,-corner_diameter/2])
		rotate ([90,0,0])
		cylinder(h = 1, r = 2.5, center = true);

		translate([0,base_width-0.5,-corner_diameter/2])
		rotate ([90,0,0])
		cylinder(h = 1, r = 2.5, center = true);

		translate([0,base_width-0.5,-stabilize_length*lenght])
		rotate ([90,0,0])
		cylinder(h = 1, r = 2.5, center = true);

	}
}

module rods()
{
rotate([tilt,0,0])
translate([0,-corner_width/2,25])
{

//side_rods
translate([0,0,plane_height/2])
cylinder(h=plane_height-space*2, r = (rod_d) / 2, center = true);

translate([plane_width,0,plane_height/2])
cylinder(h=plane_height-space*2, r = (rod_d) / 2, center = true);
echo("Side rods: 2x ",plane_height-space*2,"mm");

// middle_rod
translate([plane_width/2,0,plane_height/4])
cylinder(h=plane_height/2-space*2, r = (rod_d) / 2, center = true);
echo("middle rod: 1x ",plane_height/2-space*2,"mm");

// bottom_rod
translate([plane_width/2,0,0])
rotate([0,90,0])
cylinder(h=plane_width-space*2, r = (rod_d) / 2, center = true);
echo("Bottom rod: 1x ",plane_width-space*2,"mm");

// diagonal rods
translate([0,0,plane_height])
rotate([0,-diagonal_rod_angle,0])
translate([0,0,-diagonal_rod_length/2])
cylinder(h=diagonal_rod_length-space*2, r = (rod_d) / 2, center = true);

translate([plane_width,0,plane_height])
rotate([0,diagonal_rod_angle,0])
translate([0,0,-diagonal_rod_length/2])
cylinder(h=diagonal_rod_length-space*2, r = (rod_d) / 2, center = true);
echo("Diagonal rods: 2x ",diagonal_rod_length-space*2,"mm");

echo("Total: ",(diagonal_rod_length-space*2+plane_height-space*2)*2 + plane_height/2-space*2 + plane_width-space*2,"mm");
}

// Keyboard holes
		translate([0,(keyboard_holes_length + corner_width)/2])
		rotate ([90,0,0])
		cylinder(h = keyboard_holes_length + corner_width, r = rod_d_keyboard/2, center = true);

		translate([keyboard_holes_distance,(keyboard_holes_length + corner_width)/2])
		rotate ([90,0,0])
		cylinder(h = keyboard_holes_length + corner_width, r = rod_d_keyboard/2, center = true);

}

module round_corners()
{
	translate([0,0,0])
	rotate([90,0,0])
	cylinder(r = corner_diameter / 2, h = corner_width, center = true);

	translate([0,0,plane_height])
	rotate([90,0,0])
	cylinder(r = corner_diameter / 2, h = corner_width, center = true);

	translate([plane_width,0,0])
	rotate([90,0,0])
	cylinder(r = corner_diameter / 2, h = corner_width, center = true);

	translate([plane_width,0,plane_height])
	rotate([90,0,0])
	cylinder(r = corner_diameter / 2, h = corner_width, center = true);

	translate([plane_width/2,0,plane_height/2])
	rotate([90,0,0])
	cylinder(r = corner_diameter / 2, h = corner_width, center = true);

	translate([plane_width/2,0,0])
	rotate([90,0,0])
	cylinder(r = corner_diameter / 2, h = corner_width, center = true);

}

module corners()
{
rotate([tilt,0,0])
translate([0,-corner_width/2,25])
{
	translate([0,0,0])
	rotate([90,0,0])
	hull()
	{
		cylinder(r = corner_diameter / 2, h = corner_width, center = true);
		translate([corner_length,0,0]) cylinder(r = corner_diameter / 2, h = corner_width, center = true);
		translate([0,corner_length,0]) cylinder(r = corner_diameter / 2, h = corner_width, center = true);
	}

	translate([0,0,plane_height])
	rotate([90,0,0])
	hull()
	{
		cylinder(r = corner_diameter / 2, h = corner_width, center = true);
		translate([corner_length*sin(diagonal_rod_angle),-corner_length*cos(diagonal_rod_angle),0]) cylinder(r = corner_diameter / 2, h = corner_width, center = true);
		translate([0,-corner_length,0]) cylinder(r = corner_diameter / 2, h = corner_width, center = true);
	}

	translate([plane_width,0,0])
	rotate([90,0,0])
	hull()
	{
		cylinder(r = corner_diameter / 2, h = corner_width, center = true);
		translate([-corner_length,0,0]) cylinder(r = corner_diameter / 2, h = corner_width, center = true);
		translate([0,corner_length,0]) cylinder(r = corner_diameter / 2, h = corner_width, center = true);
	}

	translate([plane_width,0,plane_height])
	rotate([90,0,0])
	hull()
	{
		cylinder(r = corner_diameter / 2, h = corner_width, center = true);
		translate([-corner_length*sin(diagonal_rod_angle),-corner_length*cos(diagonal_rod_angle),0]) cylinder(r = corner_diameter / 2, h = corner_width, center = true);
		translate([0,-corner_length,0]) cylinder(r = corner_diameter / 2, h = corner_width, center = true);
	}

	translate([plane_width/2,0,plane_height/2])
	rotate([90,0,0])
	hull()
	{
		cylinder(r = corner_diameter / 2, h = corner_width, center = true);
		translate([corner_length*sin(diagonal_rod_angle),corner_length*cos(diagonal_rod_angle),0]) cylinder(r = corner_diameter / 2, h = corner_width, center = true);
		translate([-corner_length*sin(diagonal_rod_angle),corner_length*cos(diagonal_rod_angle),0]) cylinder(r = corner_diameter / 2, h = corner_width, center = true);
		translate([0,-corner_length,0]) cylinder(r = corner_diameter / 2, h = corner_width, center = true);
	}

	translate([plane_width/2,0,0])
	rotate([90,0,0])
	hull()
	{
		cylinder(r = corner_diameter / 2, h = corner_width, center = true);
		translate([0,corner_length,0]) cylinder(r = corner_diameter / 2, h = corner_width, center = true);
		translate([-corner_length,0,0]) cylinder(r = corner_diameter / 2, h = corner_width, center = true);
		translate([corner_length,0,0]) cylinder(r = corner_diameter / 2, h = corner_width, center = true);
	}

}
}

```


[User]
Okay, I'm looking to get a parametric OpenSCAD file designed for a Wii sensor bar mount, similar to the one I've already started, but much more flexible. I've included my current .scad file below but it's pretty limited.

Here's what I'm looking for in the design:

**Core Functionality:**

*   **Wii Sensor Holder:** Needs a space to hold the standard Wii sensor bar, ensuring it's securely in place. My current design uses a simple rectangular cutout with a couple of small cylinders on the back. I like the general concept, but we need to make this more easily customizable.
*   **TV Edge Mount:** The mount needs to grip the top edge of a flat-screen TV. It should be able to adjust to different TV thicknesses and depths. My current design uses an angled shape and a fill piece, which works, but the angles and depths are fixed.
*   **Parametric Design:** I need the following dimensions to be easily adjustable through variables:
    *   `sensor_bar_width`: Width of the Wii sensor bar (probably around 200mm, but I want to be able to adjust it to be less or greater)
    *   `sensor_bar_height`: Height of the Wii sensor bar (around 10-15mm)
    *   `sensor_bar_depth`: Depth of the Wii sensor bar (around 10mm)
    *   `tv_edge_width`: Width of the TV screen edge (this was `w` in my code).
    *   `tv_edge_depth`: Depth of the TV screen edge (this was `d` in my code).
    *   `tv_grip_angle`: Angle of the TV grip (This was `a` in my code).
    *   `mount_height`: Overall height of the mount (this is how tall the part is).
    *   `mount_depth`: Overall depth of the mount (how far the mount sticks off the front of the tv).

**Specific Design Considerations**

*   The TV mount should grip the top edge of the TV with an adjustable angle, as in my current design, and not rely on friction alone. I'm thinking an angled "hook" that extends downward behind the back of the TV would work well.
*   The mount should be printable without supports. I'd like it to be relatively compact and use as little material as possible.
*   I'd like to include an optional cable management feature; maybe a simple channel or clip in the back to route the cable. This could even be a second component that clips into the main mount. This isn't essential, but if it's easy to do I would love it.
*   I like the fill piece of my design, as it helps to fill in the space and add rigidity. The parametric version should account for this.

**Libraries**

I would like to make use of the BOSL2 library to simplify the design and ensure it is robust. I am aware it depends on the `math.scad` file also provided in the library.

**In Summary**

I need a flexible, parametric OpenSCAD design for a Wii sensor bar mount that can adjust to different TVs. The key is that it should be easy for me, or anyone else, to change the dimensions and print the specific size needed for their TV. My current code is very limited so your design will need to take a new approach.

```
// Wii Sensor Bar Stand

// Angle of sensor
a = 10;

// Width of TV edge (mm)
w = 22;

// Depth of TV edge (mm)
d = 9;

/*[Hidden]*/
$fn=20;

// Wii sensor holder
difference(){
	translate([-25,0,0])cube([25,11,10]);
	translate([-24,1,-1]) cube([23,11,12]);
	}
	translate([-24,11,0]) cylinder(r=1,h=10);
	translate([-1,11,0]) cylinder(r=1,h=10);

// TV edge holder
difference(){
	rotate([0,0,180+a]) translate([0,0,0]) cube([w+2,d+1,10]);
	rotate([0,0,180+a]) translate([1,1,-1]) cube([w,d+1,12]);
	}

// Fill piece
intersection(){
	rotate([0,0,180+a]) translate([0,-2*d,0]) cube([w+2,2*d+1,10]);
	translate([-26,-30,0])cube([26,31,10]);
}
```

[Assistant]
Wii_bar_mount.scad:
```
// Wii Sensor Bar Stand

// Angle of sensor
a = 10;

// Width of TV edge (mm)
w = 22;

// Depth of TV edge (mm)
d = 9;

/*[Hidden]*/
$fn=20;

// Wii sensor holder
difference(){
	translate([-25,0,0])cube([25,11,10]);
	translate([-24,1,-1]) cube([23,11,12]);
	}
	translate([-24,11,0]) cylinder(r=1,h=10);
	translate([-1,11,0]) cylinder(r=1,h=10);

// TV edge holder
difference(){
	rotate([0,0,180+a]) translate([0,0,0]) cube([w+2,d+1,10]);
	rotate([0,0,180+a]) translate([1,1,-1]) cube([w,d+1,12]);
	}

// Fill piece
intersection(){
	rotate([0,0,180+a]) translate([0,-2*d,0]) cube([w+2,2*d+1,10]);
	translate([-26,-30,0])cube([26,31,10]);
}
```


[User]
Okay, I'd like to design a parametric mold for making spherical ice, similar to the attached `Parametric_Ice_Mold_mk2.scad` file. I'm looking for an OpenSCAD design that allows me to customize the following:

1.  **Mold Half Selection:** I need to be able to choose whether the design creates the "Top" or "Bottom" half of the mold.

2.  **Wall Thickness:** I need to specify the wall thickness of the mold. This should be a variable so I can easily adjust it based on my printer's settings. The default in the attached file seems to be `.42`.

3.  **Connection Fit Adjustment (Fudge Factor 1):** I need a variable to slightly adjust the fit of the spiral screw-in connection. Sometimes they can be too tight, so I need a variable, with default value of `.01`, to fine-tune this. I'd expect this value to be quite small, maybe around `.01` or `.02`.

4. **Connection Fit Adjustment (Fudge Factor 2):** I need another variable, default value of `0.1`, to control the overall fit of the two halves when joined. This helps if the mold leaks, or the parts don't fit together correctly.

5.  **Mold Size:**  I need a variable to control the radius of the ice sphere the mold will produce. The default value is `20`.

6.  **Fineness:** I need a variable to control the fineness of the sphere shape of the mold, which is also `$fn` value, with a default of 30.

7.  **Build Plate Display:** I would also like to include a build plate display, like in the given design, so I can see how the mold scales with common printer platforms. This should use a `build_plate` module from the `utils/build_plate.scad` library which seems to require the following:
    *   **Build Plate Selection:** An option to select a pre-defined build plate size (e.g., Replicator 2, Replicator, Thingomatic).
    *   **Manual Build Plate Dimensions:** An option to manually specify the X and Y dimensions of the build plate when a manual selection is made.

I want all these parameters to be easily customizable, as they are in the attached `Parametric_Ice_Mold_mk2.scad` file. I also need the same structure as the provided file (e.g. using nested `difference()` calls to make the mold).

Can you please provide an OpenSCAD file that implements this design, utilizing the `utils/build_plate.scad` library?

[Assistant]
Parametric_Ice_Mold_mk2.scad:
```
/* Spherical ice (or other cast object) form
Released 2013 - Stephen Baird
License: Creative Commons - Attribution - NonCommercial - Sharealike
http://creativecommons.org/licenses/by-nc-sa/3.0/us/

Don't forget to upload pictures of what you make on Thingiverse
I love to see what people make from my designs! */

include <utils/build_plate.scad>

//Configuration options:
//CUSTOMIZER VARIABLES

//Pick which half of the mold you want to make - Top or Bottom
	top_or_bottom = "Top"; // [Bottom,Top]

//Put your wall thickness here - Default: .42 - Note: This is found under the "Advanced" option in the Print Settings tab in Slic3r
	wall_thickness = .42;

//If your spiral screw-in connection is too tight, increase this - Default: .01
	fudge_factor = .01; // [0,0.01,0.02,0.03,0.04,0.05]

//If the connection between the halves won't fit together increase this, if the mold leaks at the connection point decrease this - Default: 0.1
	fudge_factor2 = 0.1; // [0,0.025,0.05,0.075,0.1,0.125,0.15,0.175,0.2]

//Desired radius of the cast ice (or other object) - Default: 20
	mold_size = 20;

//Fineness, increase to make cast object smoother - Default: 30
fineness = 30; // [30:100]

//	This section is creates the build plates for scale
//	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]

//CUSTOMIZER VARIABLES END

//	This is just a Build Plate for scale
translate([0,0,-mold_size-2*wall_thickness]) build_plate(build_plate_selector,build_plate_manual_x,build_plate_manual_y);

//Begin object code

$fn = fineness;

// --* Bottom mold *--
if (top_or_bottom == "Bottom"){

	//Lower Shroud
	difference(){
translate([0,0,-mold_size-2*wall_thickness])cylinder(mold_size+2*wall_thickness,mold_size+(9+fudge_factor2)*wall_thickness,mold_size+(9+fudge_factor2)*wall_thickness); //outer wall
sphere(mold_size); //mold interior
	}

	//Upper Shroud
	difference(){
translate([0,0,-mold_size/4]) cylinder(mold_size/2,mold_size+(9+fudge_factor2)*wall_thickness,mold_size+(9+fudge_factor2)*wall_thickness); //outer wall
translate([0,0,-.1-mold_size/4]) cylinder(.2+mold_size/2,mold_size+(4+fudge_factor2)*wall_thickness,mold_size+(4+fudge_factor2)*wall_thickness); //inner wall

	//Connection Grooves
	for (j=[0:7]){
rotate([-40,0,45*j]) translate([-mold_size-4*wall_thickness,-1.17,1.49]) cylinder(mold_size/4,fudge_factor+2*wall_thickness,2*fudge_factor+2*wall_thickness,$fn=10); //angled groove
rotate([0,0,45*j]) translate([-mold_size-4*wall_thickness,0,1.78]) sphere(fudge_factor+2*wall_thickness,$fn=10); //corner
rotate([-90,0,45*j]) translate([-mold_size-4*wall_thickness,-1.78,-3.22]) cylinder(mold_size/6.2,fudge_factor+2*wall_thickness,2*fudge_factor+2*wall_thickness,$fn=10); //straight groove
rotate([0,0,45*j]) translate([-mold_size-4*wall_thickness,-3,1.78]) sphere(fudge_factor+2*wall_thickness,$fn=10); //ball end
	}}}

// --* Top Mold *--
if (top_or_bottom == "Top"){

	//Lower Shroud
	difference(){
translate([0,0,-mold_size-2*wall_thickness])cylinder(mold_size+2*wall_thickness,mold_size+(9+fudge_factor2)*wall_thickness,mold_size+(9+fudge_factor2)*wall_thickness); //outer wall
sphere(mold_size); //mold interior
translate([0,0,-mold_size-2]) cylinder(10,2.5,2.5,$fn=20); //filling hole

	//Upper Shroud
	difference(){
translate([0,0,-mold_size/4]) cylinder(10,mold_size+11*wall_thickness,mold_size+11*wall_thickness);
translate([0,0,-mold_size/4]) cylinder(10,mold_size+4*wall_thickness,mold_size+4*wall_thickness);
	}}

	//Connection Balls
	for (j=[0:7]){
rotate([0,0,45*j]) translate([-mold_size-4*wall_thickness,0,-1.78]) sphere(2*wall_thickness,$fn=10);
	}}
```


[User]
Okay, I'm looking to design a compact servo mount for a smoker, specifically to work with a HeaterMeter 4.0 controller. I've got a basic design in OpenSCAD, but it's not very parametric and I'd like to make it easier to adjust for different components in the future.

Here's what I've got so far, and what I'd like to achieve:

**Current Design (based on my existing .scad file, which I'll provide the code for as needed):**

*   It's essentially a mounting plate with an attached body that houses a small blower.
*   The blower is driven by an SG90 micro servo.
*   There's a support structure to brace the servo mount.
*   It uses a small aluminum rod (1/4 inch) as a shaft, although the current design uses a fixed shaft.

**Key Components & Dimensions:**

*   **Mounting Plate:**
    *   Width: ~40mm
    *   Height: ~43.5mm
    *   Thickness: ~3mm
*   **Blower Housing (Body):**
    *   Width (internal): ~25.15mm, plus wall thickness
    *   Height (internal): ~20.05mm, plus wall thickness
    *   Length: ~40mm
*   **Servo (SG90):**
    *   Height: ~7.2mm
    *   Width: ~11.72mm
    *   Length: ~22.5mm
    *   Offset from the body: ~5.2mm
*   **Shaft:**
    *   Diameter: ~1.65mm (though I want to use a standard 1/4 inch rod in the final design, so I'll want it to accommodate that)

**Desired Features:**

1.  **Parametric Design:** I'd like to be able to easily adjust all key dimensions (plate size, body size, blower size, servo dimensions, shaft diameter, etc.) using variables.
2.  **Servo Mount Flexibility:**  I'd like the servo mount to be somewhat adjustable in terms of its position relative to the blower, or if not adjustable, then have a parameter to set that servo_offset. It's also currently oriented so that the servo horn is in line with the plate, but being able to rotate that orientation could be useful.
3.  **Shaft Support:** The current design uses a fixed cylinder representing the shaft, which is not ideal for a real-world setup with a shaft. I'd like to explore having a hole or support that can accommodate the 1/4 inch aluminum rod and potentially allow for the easy insertion of a new rod. I should be able to specify this shaft diameter, as well as the diameter of any surrounding support.
4.  **Clean Construction:** I'd like the design to be clean and efficient, potentially using modules to make it easier to modify or reuse in other projects.
5.  **Mounting Flexibility:** I'd also like to explore options for easy mounting of the entire assembly, such as mounting holes in the plate or other useful mounting features.
6.  **Wall Thickness Control:**  I would like to define one wall thickness variable for the body and the servo housing that I can change globally.

**Specifically, I'm looking for an OpenSCAD file with:**

*   Well-defined parameters at the top for all the dimensions mentioned above.
*   Modules for the plate, body, servo mount, shaft support (or opening), and support structure.
*   A method to easily change the shaft diameter and adjust for the 1/4" rod.
*   (Optional) If possible, some common mounting hole patterns added to the mounting plate.

**I'm NOT looking for:**

*   Any specific rendering or output styles (I can handle that myself).
*   Any inclusion of libraries for screw threads, or gears.
*   A design that is specific to my aluminum rod, instead I would like the opening to be a parametric, and then use a shaft diameter parameter to control it

Could you please generate a parametric OpenSCAD file that accomplishes these goals?

[Assistant]
blowerservo.scad:
```
plate_width=40;
plate_height=43.5;
plate_thickness=3;
wall_thickness=.83;
blower_width=25.15;
blower_height=20.05;

body_width=blower_width+2*wall_thickness;
body_height=blower_height+2*wall_thickness;
body_length=40;

motor_height=7.2;
motor_width=11.72;
motor_length=22.5;
motor_offset=5.2;
shaft=1.65;

module plate(){
difference(){
cube(size=[plate_height,plate_width,plate_thickness], center=true);
cube(size=[blower_height,blower_width,plate_thickness+10], center=true);
}
}

module body(){
difference(){
translate([0,0,body_length/2])cube(size=[body_height,body_width,body_length], center=true);
translate([0,0,body_lenght/2])cube(size=[blower_height,blower_width,body_length+100], center=true);
}
}

module motor(){
translate([motor_offset,blower_width/2+motor_height/2,body_length/2])rotate([0,90,0])
difference(){
cube(size=[motor_width+2*wall_thickness,motor_height,motor_length+10], center=true);
translate([0,1,0])cube(size=[motor_width,motor_height-1,motor_length], center=true);
}
}

module support(){
translate([0,body_width/2+motor_height-wall_thickness,body_length/2-motor_width/2-wall_thickness])rotate([90,90,270])linear_extrude(height = body_height, center = true, convexity = 10)  polygon([[0,0],[0,motor_height],[motor_height,motor_height]]);

translate([plate_width/2-1,body_width/2-.925,0])cube(size=[2.5,motor_height,body_length/2]);
}

difference(){
union(){
plate();
body();
motor();
support();
}

translate([1.65,body_width/2+motor_height/2,body_length/2-.1])cube(size=[blower_height-5,motor_height+5,motor_width], center=true);

translate([0,0,body_length/2])rotate([90,0,0])cylinder(h=60, r=shaft, $fn=80);

}

```


[User]
Okay, so I'm trying to design a better ant trap. I've got one I kinda like that I've been messing with, but I want something a bit more flexible.

Essentially, I want a cylindrical dish that ants can easily get into, with a lip to make it harder for them to just fall in. There should be a recessed, bowl-shaped area in the center where I can put the ant bait. The base of the dish needs to be wider than the top for stability, and I need some thickness under the lowest point of the bowl to keep things solid.

Here's a breakdown of what I'm picturing:

*   **Overall Shape:** A cylinder that flares out towards the base. The top needs to have a lip, and the center should be hollowed out with a bowl-like depression that holds the bait.
*   **Parameters:** I'd really like this to be parametric, so I can adjust all this easily. I'm thinking these parameters would be useful:
    *   `height`:  The overall height of the trap.
    *   `diameter`: The diameter of the trap at its *top*.
    *   `lip_width`: How wide the lip extends out from the top diameter.
    *   `min_bottom`: The minimum thickness of the material at the bottom of the bait well.
    *   `base_enlargement`: How much wider the base of the trap is than the top. This will need to be added to the radius, not the diameter.
    *    `bait_well_sphere_radius`: This will control the size of the sphere used to carve out the bait well, it is more intuitive than trying to modify the diameter directly.
*   **Construction:**
    1.  Start with a cylinder that has the top diameter.
    2.  Use a separate cylinder that extends past the height of the trap to create the base with the enlargement.
    3.  Use a sphere to cut out the bait well from the top. This sphere should be slightly taller than the height of the well so that it fully intersects with the base.
*   **OpenSCAD Libraries:** I'm not sure if any libraries would help here, but if there are, let me know. I'm familiar with the basics of OpenSCAD, and understand simple boolean operations like `difference()`, `union()`, `intersection()` etc.

Could you write an OpenSCAD file that does that? I need to be able to tweak all of those parameters to get the design just right. Please make sure there are comments so I can follow what's going on.

[Assistant]
ant-trap.scad:
```
//Height of the ant trap:
height = 8;

//Width of the ant trap:
diameter = 67;

//How wide should the lip be?
lip_width = 5;

//How much material under the lowest point of the dish?
min_bottom = 2;

//How much wider is the base than the top of the dish?
base_enlargement = 10;

difference(){

//base of trap:
translate([0,0, height/2])
	cylinder(h = height, r1 = diameter/2, r2 = diameter/2-base_enlargement, center = true);

//Poison well:
translate([0,0, height])
	resize(newsize = [diameter-((lip_width+base_enlargement)*2), diameter-((lip_width+base_enlargement)*2), (height*2)-(min_bottom * 2)])
		sphere(r=10, center=true);

}
```


[User]
Okay, I'm looking to create a parametric design for a block and tackle system, and I want to be able to customize a lot of things. I found a really good starting point (rope-roller-2.scad) but it's not quite as flexible as I'd like.

Here's what I'd like to be able to control in my OpenSCAD design:

**Core Components & Parameters:**

*   **Number of Sheaves (Rollers):** I need to be able to set the number of rollers/sheaves in the block. The current design uses `nn` for the number of "spaces" and then `n=nn+1` for the number of plates, and that’s fine for me.
*   **Rope Diameter:** I need to specify the diameter of the rope being used. This affects groove size on the wheel and spacing on the rest of the block. I see that there is `drope` for the diameter and that `rrope = drope/2`.
*   **Axle Diameter:**  I'm using bolts for axles (or perhaps will move to using bearings).  So, I need to be able to set the axle diameter. The existing design uses `daxle` and `raxle` as you can see.
*   **Wheel/Sheave Diameter (at rope center):** The diameter of the roller where the rope sits is needed for calculation of clearances. I see it uses `dloop` and `rloop`, which is fine, but note it says to choose `dloop > daxle + drope/2`.
*  **Wheel Thickness:** The thickness of the wheel needs to be parametric, the current design is `twheel = drope*sqrt(2)`, but I might use ball bearings in the future so I need to control this.
*   **Burgerplate Thickness:** I want to set the thickness of the side plates (the "burgerplates"), this is `t` right now, so I would like to control that.
*  **Eyelet Diameter:** The diameter of the eyelet used to connect to the other block or supports.  I want to control this as `deyelet` (or `rring` as it's defined).
* **Eyelet Thickness:** The thickness of the eyelet, currently using `tcenter`.
*  **Clearing Space:** I need to control the extra space around the wheel so it moves freely.  Right now, I see `clr` is defined for this. I also see `add` to control the rope channel clearance, and `rout` used for that purpose.
*  **Beveling:** I need to independently adjust bevels on the burgerplates and on the eyelet. I see `bevel` and `bevel2` currently in the design.

**Desired Features:**

*   **Parametric Design:**  All of the above parameters should be easily adjustable to create different blocks for various rope sizes, axle sizes, etc.
*   **Wheel/Sheave Geometry:** The wheel should have a proper groove to hold the rope, following the design from the example code using tori.
*   **Side Plates/Burgerplates:** The side plates should be connected by a centerpiece that holds the axle hole. This should also be parametrically controlled (like in the original design with `l0` and `tcenter`).
*   **Eyelet:** There should be a loop or eyelet for attaching the rope or carabiner. This should be able to have separate bevelling.
*   **Clearance:** I want to make sure there's enough clearance for the rope to move freely, and this is partially controlled using the variable `add` right now, which is good.
*   **Units:**  I'll be using millimeters for all measurements.

**Output:**

*   I'd like the output to be an OpenSCAD file that generates the entire block and tackle system.
*   Ideally, the design would allow me to render the "block" and "wheel" separately (like in the original design).
*   I'd really like to be able to design a single-sheave block and a double-sheave block, and also go higher.

**Libraries:**
* I'm not requesting anything from external libraries like BOSL or MCAD at this point, since the design seems relatively straightforward.

I think that's it.  Can you generate the OpenSCAD code based on these requirements?

[Assistant]
rope-roller-2.scad:
```

// 2013 Lukas Süss aka mechadense - CC-BY
// Blocks with Tackle - customizable

/*

These are general blocks for the construction of:
http://en.wikipedia.org/wiki/Block_and_tackle
Among other options you can choose the number of sheaves the blocks hold.

DO NOT USE THIS TO SECURE LIFE OR OBJECTS OF HIGH VALUE
THIS IS A FREE MODEL
THE ENTIRE RISK OF USING THIS OBJECT IS WITH YOU
I AM NOT REPONSIBLE FOR ANY DAMAGE ARISING OUT OF THE USE OF THIS OBJECT

when using these you'll probably need to bind some knots:
mid-rope-loop:
  http://en.wikipedia.org/wiki/Butterfly_loop
non tightening loop:
  http://en.wikipedia.org/wiki/Bowline
self tightening loop:
  http://en.wikipedia.org/wiki/Double_overhand_noose
end knot:
  http://en.wikipedia.org/wiki/Figure-eight_knot
keep rope tidy:
  http://de.wikibooks.org/wiki/Klettern/_Seiltransport   (de Seilpuppe -> en ???)
non tightening but adjustable loop:
  http://en.wikipedia.org/wiki/Blake%27s_hitch
bindable under high tension:
  http://en.wikipedia.org/wiki/Round_turn_and_two_half-hitches

Note:
Tripple or higher-tupled blocks where not tested.

# Example

The single and double example blocks with otherwise default settings
are for rope with diameter of 4mm and M6 Bolts. With these you can make:
2 x advantage: Gun tackle
3 x advantage: Luff tackle
4 x advantage: Double tackle

I've succesfully tested a Luff tackle with a load reduction from 15 to 5 kg

To reproduce my setup you'll need one dual and one single sheave block
First assemble the blocks.
Then put the single-sheave-blocks eyelet over one end A of the rope.
With the ropes end A bind a self tightening loop (...) around the load.
Near the loop bind the sigle-sheave-blocks eyelet into a butterfly loop.
Thread the ropes far end B through one of the sheaves of the double-sheave-block.
Keep the block some distance away.
Go back and thread B through the single-sheave-blocks sheave.
Finally thread B through the second sheave of the double block.
Try to keep everything untangled.
Bind a stopper eight knot in the end of the rope to prevent it from slipping out.
Use two bowline or self tightening knots to mount the eyelet to your support structure.
Finished -> start pulling. When the load is in place bind a blakes hitch around one of the tensioned ropes to secure it.

# Hint

Print with the layers perpendicular to the holes
Print with full support and file the burgerplates thoroughly flat afterwards.
PLA prints need to be lubed to work properly.

The rope used in my case was:
http://www.amazon.de/Seil-Leine-Schnur-16-fach-x20AC/dp/B0085IZ054/ref=sr_1_6?ie=UTF8&qid=1378759292&sr=8-6&keywords=pp+seil

*/

// resolution: maximal angle per vertex
$fa = 5;
// resolution: minimal length per facet
$fs = 0.25;

// ########### "vitamin" parameters
// axle diammeter + clearing
daxle = 6.3;
raxle = daxle/2;
// rope diameter
drope = 4;
rrope = drope/2;
//############

// wheel thickness
twheel = drope*sqrt(2);

// burgerplate thickness
t = 7;

// number of rollers
nn = 2; // [1,2,3,4,5,6,7,8]
n = nn+1;

// roller diameter at center of rope: choose > daxle+drope/2
dloop = 18;
rloop = dloop/2;
// choose dloop greater than daxle+drope/2 !!

// additional space for rope to go through
add = 2*1;
rout = rloop+rrope+add; // free space
// burgerplate diameter - keep >= rout*2
w = rout*2;

// clearing - added on both sides
clr = 0.25;
// 0.1 was too little - dont forget to file flat

// burgerplate bevellings
bevel = 0.75;
// eyelet bevellings
bevel2 = 2;

// do not change - too keep load balanced?
//l0 =  w/2-daxle/2; // why -daxle/2
l0 = w/2*0.75;

// eyelet beefiness
tcenter = t; // equal burgerplate thickness

// eyelet diameter
deyelet = rrope*5;
rring = deyelet/2;

htotal = (t+twheel+2*clr)*n-twheel-2*clr;

//dentout
f = 0.1;

part = "block"; // [block,wheel]
//part = "wheel"; // [block,wheel]

//####################
if (part=="block") hoist();
if (part=="wheel") wheel();

// debug stuff
//cube([10,10,10]);
//translate([0,0,t/2+twheel/2+clr]) wheel();
//#####################

module hoist()
{
  plates();
  translate([0,-f*htotal,0]) hook();
}

module plates()
{
  difference()
  {
    union()
    {
      for(i=[0:n-1])
      {
         translate([0,0,(i-n/2+1/2)*(twheel+t+2*clr)]) // clearance added
         {
           bccylinder(w/2,t,bevel);
           // neck
           translate([0,-(rout+bevel2)/2,0])
             bxyzcube(2*l0,rout+bevel2,t,bevel2,bevel2*0,bevel2);
         }
      }
      // sideplate connector centerpiece - backplate
      translate([0,-rout-tcenter/2,0])
      hull()
      {
        bxyzcube(2*l0,tcenter,htotal,bevel2,bevel2,bevel2);
        translate([0,-f*htotal,0])
        bxyzcube(2*l0,tcenter,tcenter*1.618,bevel2,bevel2,bevel2);
        // tcenter*1.618
      }
    }
   // cut for axle
   cylinder(r=raxle,h=100,center=true);
  }
}

module hook()
{
  difference()
  {
    translate([0,0,0])
    {
      // make eyelet body
      translate([0,-(rout+tcenter)-rring,0])
        bccylinder(rring+tcenter,tcenter*1.618,2);
    }

    // cut eyelet ring
    translate([0,-(rout+tcenter)-rring,0])
     cylinder(r=rring,h=tcenter*3,center=true);

    // break eyelet edges
    translate([0,-(rout+tcenter)-rring,-tcenter*1.618/2+bevel])
      cylinder(r1=rring+bevel2,r2=rring,h=bevel2,center=true);
    scale([1,1,-1])
    translate([0,-(rout+tcenter)-rring,-tcenter*1.618/2+bevel])
      cylinder(r1=rring+bevel2,r2=rring,h=bevel2,center=true);
  }
}

module wheel()
{
  difference()
  {
    intersection()
    {
      union()
      {
        // radial size
        cylinder(r=rloop-rrope*(1/sqrt(2)),h=drope*sqrt(2)+10,center=true);

        // gside rounded groove ends
        translate([0,0,rrope*sqrt(2)])
          torus(rrope,rloop-rrope*sqrt(2));
        translate([0,0,-rrope*sqrt(2)])
          torus(rrope,rloop-rrope*sqrt(2));
      }
      //axial size
      cylinder(r=rloop*2,h=twheel-2*clr*0,center=true); // clearing removed
    }

    // groove cutter
    torus(rrope,rloop);

     cylinder(r=raxle,h=20*drope,center=true);
  }
}

// #############################
module torus(r1,r2)
{
  rotate_extrude(convexity=8)
  translate([r2,0,0])
    circle(r=r1);
}
module elongorus(r1,r2,l)
{
  rotate_extrude(convexity=8)
  translate([r2,0,0])
    hull()
    {
      translate([0,l/2,0]) circle(r=r1);
      translate([0,-l/2,0]) circle(r=r1);
    }
}

module bxyzcube(x,y,z,bx,by,bz)
{
  hull()
  {
    cube([x-2*bx, y-2*by, z     ],center=true);
    cube([x,      y-2*by, z-2*bz],center=true);
    cube([x-2*bx, y,      z-2*bz],center=true);
  }
}

module bcube(x,y,z,b=bevel)
{ translate([x/2,y/2,z/2]) bccube(x,y,z,b); }

module bccube(x,y,z,b=bevel)
{
  hull()
  {
    cube([x-2*b,y-2*b,z],center=true);
    cube([x,y-2*b,z-2*b],center=true);
    cube([x-2*b,y,z-2*b],center=true);
  }
}

module bccylinder(rr,hh,b)
{
  eps = 0.05;
  translate([0,0,-hh/2])
  {
    cylinder(r1=rr-b,r2=rr,h=b);
    translate([0,0,b-eps]) cylinder(r=rr,h=hh-2*b+2*eps);
    translate([0,0,hh-b]) cylinder(r1=rr,r2=rr-b,h=b);
  }
}
module bccylinder2(rr,hh,b)
{
  eps = 0.05;
  translate([0,0,-hh/2])
  {
    cylinder(r1=rr+b,r2=rr,h=b);
    translate([0,0,b-eps]) cylinder(r=rr,h=hh-2*b+2*eps);
    translate([0,0,hh-b]) cylinder(r1=rr,r2=rr+b,h=b);
  }
}

```


[User]
Okay, I'd like to design a customizable pen that has a word or phrase embossed on it, kind of like a personalized pen. I've been playing around with OpenSCAD and have a basic idea, but I need help making it parametric and more robust. I'm aiming to make it fit a standard Bic ballpoint pen refill.

Here's a breakdown of what I'm looking for:

**Overall Structure:**
*   The pen should consist of two main parts: a body and a cap (lid).
*   The pen body should have rounded edges for comfortable writing.
*   The length of the pen should ideally scale to fit the length of the word being displayed.
*   The cap needs to fit snugly over the pen body, with a slight tolerance for easy removal but secure fit.
*  I would like helper tabs to print alongside the body to prevent warping.

**Pen Body:**
*   **Word Emboss:** The pen body should have a word or phrase embossed along its length. I need to be able to easily change what word is displayed. The font needs to be customizable as well, and preferably not just hardcoded to one font.
*   **Bic Refill Hole:** A hole should be created to hold the refill.
    *   The diameter of the hole for the ballpoint tip needs to be parameterizable.
    *   The diameter of the hole for the inner tube should also be parameterizable.
    *   The length of the hole needs to be parameterizable as well.
*   **Body Thickness:** The overall thickness of the pen body should be adjustable.
*  **Tail Section:** If the word length is shorter than the length of the inner pen refill, the pen body should extend past the refill hole by some parametric amount.

**Cap (Lid):**
*   **Length:** The length of the cap needs to be adjustable.
*   **Fit:** The cap needs to fit snugly over the pen body, but not so tight that it's difficult to remove. So the diameter of the cap hole and the pen body should be a parameterizable distance away. The cap wall thickness should also be parametric.
*  **Cap Geometry:** I want to add a small rectangular extension on one side of the cap for aesthetic reasons. I want this extension to be customizable in size, position and rotation.

**Parameters I'd Like to Control:**

*   `object`: An option to render all components or just the pen body or just the lid. (enum: All, Pen Only, Cap Only)
*   `word`: The text to emboss on the pen.
*   `helper_tabs`: A boolean to enable or disable helper tabs for printing.
*   `tip_diameter`: The diameter of the hole for the pen tip.
*   `inner_diameter`: The diameter of the hole for the ink tube.
*   `inner_length`: The length of the ink tube (refill)
*   `pen_thickness`: The overall thickness of the pen body.
*   `lid_length`: The length of the cap.
*   `tolerance`: The gap between the pen body and cap for fit.
*   `font_scale`: A relative scaling factor for the font size.
*   `font_spacing`: A relative space factor between letters.
*   `font`: An option to choose which font is displayed.
*  `tail_length`: the length the pen body extends past the pen refill hole if required.
*  `cap_extension_length`: the length of the rectangular cap extension
*  `cap_extension_width`: the width of the rectangular cap extension
*  `cap_extension_height`: the thickness of the rectangular cap extension
*  `cap_extension_x`: x position of the cap extension
*  `cap_extension_y`: y position of the cap extension
*  `cap_extension_rotation`: z rotation of the cap extension

**Libraries:**

I'd like to use the `MCAD` library for fonts, if that is suitable. I don't have any other specific libraries in mind at the moment.

Can you help me create a parametric OpenSCAD file for this pen? I'm looking for something that's well-structured and easy to modify. I'd like to be able to just input my desired parameters and have it generate the pen with the right dimensions and embossed word. Thanks!

[Assistant]
Bic_Word_Pen.scad:
```
// Advanced Customizable Word Pen

use <MCAD/fonts.scad>

wordpen(mode=object);

/* [Word] */

// choose which part of the pen to render
object=1;//[1:All,2:Pen Only,3:Cap Only]

// the word to display on the pen
word = "Bictastic";

// generate single layer helper-tabs
helper_tabs=1;//[0:Disable,1:Enable]

/* [Cartridge] */

// the diameter of hole for the ball point tip
tip_diameter = 4;

// the diameter of the pen ink inner tube
inner_diameter = 3.4;

// the length of the entire pen inner (minus the ball point tip protrusion)
inner_length = 125;

/* [Body] */

// overall thickness of the pen
pen_thickness = 7;

// the lenfth of the lid
lid_length = 30;

// the gap between the pen body and pen lid
tolerance=0.2;

// the relative size of the font
font_scale = 2.1;

// the relative space between letters
font_spacing = 0.81;

/* [Hidden] */ //////////////////////////////////////////////////////////////////

top_offset=1.2*1;
font_height = pen_thickness + 1.5;
the_font = 8bit_polyfont();
x_shift = the_font[0][0] * font_spacing;
y_shift = the_font[0][1];
the_indicies = search(word,the_font[2],1,1);
word_size = len(the_indicies);
word_offset =  word_size < 8 ? (8 - word_size) / 2 : 0;
word_length = (word_size+2)*x_shift*font_scale;
pen_length = word_length > inner_length ? word_length : inner_length;
tip_radius = tip_diameter/2;
inner_radius = inner_diameter/2;
inner_thickness = pen_thickness-2.5;
lid_thickness = pen_thickness+3.2;
lid_hole = pen_thickness+tolerance*2;

module testpen() {
difference() {
wordpen();
translate([0,0,pen_thickness]) cube([300,30,pen_thickness], center=true);
}}

module wordpen(mode=1) {
	translate([-(pen_length - 30)/2,0,0]) difference() {
		union() {
			if(mode!=3) {
				translate([0,0,pen_thickness/2]) {
					pen();
					// Create the Text
					scale([font_scale,font_scale,1]) {
					for( j=[0:(word_size-1)] )
						translate([(j+top_offset+word_offset)*x_shift, -y_shift/2, -pen_thickness/2]) {
							linear_extrude(height=font_height)
								polygon(points=the_font[2][the_indicies[j]][6][0], paths=the_font[2][the_indicies[j]][6][1]);
						}
					}
					// End Pen
				}
				if(helper_tabs) {
					// Helper discs
					translate([pen_length, 0, 0]) cylinder(h=0.15, r=10);
					translate([0, -0.25, 0]) cube([5, 0.5, pen_thickness/2]);
				}
			}
			if(mode!=2) {
				lid();
			}
			if(helper_tabs) {
				translate([2, 0, 0]) cylinder(h=0.15, r=10);
			}
		}
		if(mode!=3) translate([0,0,pen_thickness/2]) {
			// Pen cut outs
			translate([8,-inner_thickness/4, 0]) rotate(a=[0, 90, 0]) cylinder(h=inner_length-15, r=inner_thickness/2, $fn=50);
			translate([8,-inner_thickness/4,-inner_thickness/2]) cube([inner_length-15, inner_thickness/2, inner_thickness]);
			translate([8, inner_thickness/4, 0]) rotate(a=[0, 90, 0]) cylinder(h=inner_length-15, r=inner_thickness/2, $fn=50);
			translate([-5, 0, 0]) rotate(a=[0, 90, 0]) cylinder(h=15, r=tip_radius, $fn=50);
			translate([3, 0, 0]) rotate(a=[0, 90, 0]) cylinder(h=inner_length-3, r=inner_radius, $fn=50);
               // tail
               if(pen_length > inner_length) {
			  translate([inner_length + 4,-inner_thickness/4, 0]) rotate(a=[0, 90, 0]) cylinder(h=pen_length-inner_length-5, r=inner_thickness/2, $fn=50);
			  translate([inner_length + 4,-inner_thickness/4,-inner_thickness/2]) cube([pen_length-inner_length-5, inner_thickness/2, inner_thickness]);
			  translate([inner_length + 4, inner_thickness/4, 0]) rotate(a=[0, 90, 0]) cylinder(h=pen_length-inner_length-5, r=inner_thickness/2, $fn=50);
               }
		}
	}
}

module pen() render() {
// Pen Tip
translate([0,-pen_thickness/4, 0]) rotate(a=[0, 90, 0]) cylinder(h=5, r1=0, r2=pen_thickness/2, $fn=50);
if(tip_radius+0.5 < pen_thickness/3.5) {
	rotate(a=[0, 90, 0]) cylinder(h=5, r1=pen_thickness/3.5, r2 =pen_thickness/2, $fn=50);
}
else {
	rotate(a=[0, 90, 0]) cylinder(h=5, r1=tip_radius+0.5, r2 =pen_thickness/2, $fn=50);
}
translate([0, pen_thickness/4, 0]) rotate(a=[0, 90, 0]) cylinder(h=5, r1=0, r2=pen_thickness/2, $fn=50);
// Main body
translate([5,-pen_thickness/4, 0]) rotate(a=[0, 90, 0]) cylinder(h=pen_length-3, r=pen_thickness/2, $fn=50);
translate([5,-pen_thickness/4,-pen_thickness/2]) cube([pen_length-3, pen_thickness/2, pen_thickness]);
translate([5, pen_thickness/4, 0]) rotate(a=[0, 90, 0]) cylinder(h=pen_length-3, r=pen_thickness/2, $fn=50);
}

module lid() translate([0,0,lid_thickness/2]) difference() {
union(){
	// Lid
	translate([-lid_length-5,-lid_thickness/4, 0]) rotate(a=[0, 90, 0]) cylinder(h=lid_length, r=lid_thickness/2, $fn=50);
	translate([-lid_length-5,-lid_thickness/4,-lid_thickness/2]) cube([lid_length, lid_thickness/2, lid_thickness]);
	translate([-lid_length-5,lid_thickness/4],0) rotate(a=[0, 90, 0]) cylinder(h=lid_length, r=lid_thickness/2, $fn=50);
	translate([-lid_length-5,0,-lid_thickness/2]) cube([3, (lid_thickness*3/4)+1.5, lid_thickness]);
	translate([-lid_length-5,(lid_thickness*3/4)+1.5,-lid_thickness/2]) cube([lid_length, 2, lid_thickness]);
	translate([-7,(lid_thickness*3/4)+0.1,-lid_thickness/2]) rotate(a=[0, 0, 45]) cube([2, 2, lid_thickness]);
}
union(){
	// Lid cut outs
	translate([-lid_length-2,-lid_hole/4, 0]) rotate(a=[0, 90, 0]) cylinder(h=lid_length, r=lid_hole/2, $fn=50);
	translate([-lid_length-2,-lid_hole/4,-lid_hole/2]) cube([lid_length, lid_hole/2, lid_hole]);
	translate([-lid_length-2, lid_hole/4, 0]) rotate(a=[0, 90, 0]) cylinder(h=lid_length, r=lid_hole/2, $fn=50);
}}

```


[User]
Okay, I'd like to design a customizable, folding, print-in-place word pencil case. I want it to be reversible, with a ruler edge and an 8-bit style letter pencil topper. I'm envisioning something like a hinged box that can fold flat, with the word embossed on the side.

Here's what I'm looking for in terms of parameters:

**General:**

*   **`object`**: An option to render the entire object, just the pencil case, or just the pencil topper (options should be `1:All`, `2:Pencil Case Only`, `3:Pencil Topper Only`).
*   **`word`**: The text to display on the pencil case.
*  **`font_scale`**: A relative scaling factor for the font.
*   **`font_spacing`**: The spacing between letters.
*   **`helper_tabs`**: A boolean (0/1) for whether to add helper tabs to the pencil topper to help with printing.

**Dimensions:**

*   **`width`**: The width of the main pencil case.
*   **`length`**: The length of the main pencil case.
*   **`height`**: The height of the main pencil case.
*   **`thickness`**: The thickness of the pencil case walls.

**Hinge:**

*   **`x_steps`**: Number of hinge segments along the width of the case.
*   **`y_steps`**: Number of hinge segments along the length of the case.
*   **`x_corner`**: The offset of the hinge from the corner in the x direction.
*   **`y_corner`**: The offset of the hinge from the corner in the y direction.
*   **`tolerance`**: The gap between hinge elements.

**Font:**

*   I'd like to use an 8-bit style font similar to the one in the example, which uses a custom font called `8bit_polyfont()` within a library.
*  I will need a way to define the character height, `font_height`, so I can control how far it is extruded.

The design should include:

*   A base structure with rounded edges and corners.
*   Two side walls with hinges and the embossed word.
*   Two end walls with hinges and interlocking elements.
*  A lid with hinges, ruler markings, a handle hole and a locking notch feature.
*   A separate pencil topper with the first letter of the word in a similar 8-bit style, and optional helper tabs.
*   Print-in-place hinges, using the `tolerance` parameter, so the case can fold right off the print bed.
* A series of small marks to serve as a ruler edge.

I'm using the `MCAD/fonts.scad` library for the font.

Could you generate an OpenSCAD file for this?

[Assistant]
Word_Case.scad:
```
// Reversible print-in-place word pencil case by whpthomas

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

use <MCAD/fonts.scad>

/* [Word] */

// choose which part of the object to render
object=1;//[1:All,2:Pencil Case Only,3:Pencil Topper Only]

// the word to display on the pencil case
word="Fantastic";

// the relative size of the font
font_scale=2.1;

// the space between letters
font_spacing=0.81;

// add a helper tab print aid to the pencil topper
helper_tabs=1;//[0:Disable,1:Enable]

/* [Dimensions] */

// the case width
width=40;

// the case length
length=190;

// the case height
height=25;

// the case thickness
thickness=3.5;

/* [Hinge] */

// the number of x steps
x_steps=2;

// the number of y steps
y_steps=16;

// the x corner offset
x_corner=20;

// the y corner offset
y_corner=26;

// the gap between the hinge elements
tolerance=0.3;

/* [Hidden] */

part();

module part() {
  if(object==1) {
    translate([length/2+height/2+6, -width/2-height/2-6, 0]) topper();
    wordcase();
  //build_plate();
  }
  if(object==2) {
    wordcase();
  }
  if(object==3) {
    topper();
  }
}

$fn=20*1;

x_hinge=(width-20)/x_steps;
y_hinge=(length-26)/y_steps;
hinge_rad=thickness/2;

font_height=1*1;
the_font = 8bit_polyfont();
x_shift = the_font[0][0] * font_spacing;
y_shift = the_font[0][1];
the_indicies = search(word,the_font[2],1,1);
word_size = len(the_indicies);
word_length = (word_size+2)*font_scale;

module wordcase()
rotate([0,0,90])
translate([0,0,hinge_rad]) {
  base();
  x_side();
  rotate([0,0,180]) x_side(180);
  y_side();
  rotate([0,0,180]) y_side();
  lid(55);
  rotate([0,0,180]) lid(-55);
}

module base() {
  x_offset=width/2;
  y_offset=length/2;
  difference() {
    union() {
      cube([width, length, thickness], center=true);
      // edges
      translate([x_offset,0,0]) rotate([90,0,0]) cylinder(h=length, r=hinge_rad, center=true);
      translate([-x_offset,0,0]) rotate([90,0,0]) cylinder(h=length, r=hinge_rad, center=true);
      translate([0,y_offset,0]) rotate([0,90,0]) cylinder(h=width, r=hinge_rad, center=true);
      translate([0,-y_offset,0]) rotate([0,90,0]) cylinder(h=width, r=hinge_rad, center=true);
      // corners
      translate([x_offset,y_offset,0]) sphere(hinge_rad, center=true);
      translate([-x_offset,y_offset,0]) sphere(hinge_rad, center=true);
      translate([x_offset,-y_offset,0]) sphere(hinge_rad, center=true);
      translate([-x_offset,-y_offset,0]) sphere(hinge_rad, center=true);
    }
    // hinge
    translate([x_offset,0,0]) hinge(y_steps, y_hinge, hinge_rad, tolerance/2);
    translate([-x_offset,0,0]) rotate([0,0, 180]) hinge(y_steps, y_hinge, hinge_rad, tolerance/2);
    translate([0,y_offset,0]) rotate([0,0,90]) hinge(x_steps, x_hinge, hinge_rad, tolerance/2);
    translate([0,-y_offset,0]) rotate([0,0,-90]) hinge(x_steps, x_hinge, hinge_rad, tolerance/2);
  }
}

module lid(angle=60) {
  x_offset=width/4;
  y_len=length-thickness-tolerance;
  translate([-width/2-height-width/4,0,0])
  difference() {
    union() {
      cube([width/2, y_len, thickness], center=true);
      translate([-width/4,0,0]) cube([thickness*2, length+thickness, thickness], center=true);
      // rounded edge
      translate([x_offset,0,0]) rotate([90,0,0]) cylinder(h=y_len, r=hinge_rad, center=true);
    }
    // hinge
    translate([x_offset,0,0]) rotate([0,0, 180]) hinge(y_steps+2, y_hinge, hinge_rad, tolerance/2);
    // ruler edge
    translate([-width/4+tolerance/2,0,0]) rotate([0,angle,0]) translate([-thickness,0,0]) cube([thickness*2, length+thickness*2, thickness*3], center=true);
    // handle hole
    translate([-width/4,0,0]) cylinder(h=thickness*2, r=thickness*2.5, center=true);
    // ruler
    translate([-width/4+tolerance/2,-length/2,0]) rotate([0,angle,0]) darts();
  }
}

module darts() render() {
for(i=[0:10:length]) {
    translate([0,i,0]) rotate([0,0,45]) cube([0.5,0.5,thickness*2], center=true);
  }
}

module notch(tol=0) {
  y_offset=thickness+tol;
  n_len=thickness*0.7;
  cube([thickness+tol, thickness*2+tol*2, thickness*2], center=true);
  translate([0,y_offset,0]) rotate([0,0,45]) cube([n_len,n_len,thickness*2], center=true);
  translate([0,-y_offset,0]) rotate([0,0,-45]) cube([n_len,n_len,thickness*2], center=true);
}

module x_side(angle=0) {
  x_offset=height/2;
  y_len=length+thickness;
  translate([-width/2-height/2,0,0])
  difference() {
    union() {
      cube([height, y_len, thickness], center=true);
      // edges
      translate([x_offset,0,0]) rotate([90,0,0]) cylinder(h=y_len, r=hinge_rad, center=true);
      translate([-x_offset,0,0]) rotate([90,0,0]) cylinder(h=y_len, r=hinge_rad, center=true);
    }
    // hinge
    translate([x_offset,0,0]) rotate([0,0, 180]) hinge(y_steps+2, y_hinge, hinge_rad, tolerance/2);
    translate([-x_offset,0,0]) rotate([0,0, 180]) hinge(y_steps, y_hinge, hinge_rad, tolerance/2);
    // notch
    translate([0,length/2,0]) rotate([0,0,90]) notch(tolerance);
    translate([0,-length/2,0])  rotate([0,0,-90]) notch(tolerance);
    // word
    rotate([angle,0,angle ? -90 : 90])
    translate([-(word_size+1)*x_shift,0,0])
    scale([font_scale,font_scale,1]) {
      for( j=[0:(word_size-1)] )
      translate([j*x_shift, -y_shift/2, thickness/2-font_height]) {
        linear_extrude(height=font_height*2)
        polygon(points=the_font[2][the_indicies[j]][6][0], paths=the_font[2][the_indicies[j]][6][1]);
      }
    }
  }
}

module y_side() {
  y_offset=height/2;
  x_len=width-thickness-tolerance;
  translate([0,-length/2-height/2,0])
  difference() {
    union() {
      translate([0,-hinge_rad/2,0]) cube([x_len, height+hinge_rad, thickness], center=true);
      // notch
      translate([width/2-thickness/2,0,0]) rotate([0,90,0]) notch();
      translate([-width/2+thickness/2,0,0]) rotate([0,-90,0]) notch();
      // edges
      translate([0,y_offset,0]) rotate([0,90,0]) cylinder(h=x_len, r=hinge_rad, center=true);
    }
    // hinge
    translate([0,y_offset,0]) rotate([0,0,-90]) hinge(x_steps+2, x_hinge, hinge_rad, tolerance/2);
    // slot
    translate([0,-y_offset-thickness/2,0]) cube([thickness*2+tolerance*2, thickness*2+tolerance, thickness*2], center=true);
  }
}

module hinge(n=8, len=8, rad=2, tol=0) {
translate([0,-(n*len)/2,0])
for(i=[0:2:n]) {
  translate([0,i*len,0]) hinge_link(len, rad, tol);
}}

module hinge_link(len=8, rad=2, tol=0) {
  tip=rad+rad/2;
render()
translate([0,len/2+tol/2,0])
rotate([90,0,0]) {
  difference() {
    union() {
      translate([-rad-tol, -rad-tol, 0]) cube([(rad+tol)*2, (rad+tol)*2, len+tol]);
      translate([0,0,len+tol-0.02]) cylinder(h=tip, r1=rad+tol, r2=0);
    }
    translate([0,0,-0.02]) cylinder(h=tip, r1=rad+tol, r2=0);
  }
}}

module topper() translate([0,0,6]) {
  difference() {
	union() {
	  difference() {
		cube(12, center=true);
		rotate([0,0,180]) letter();
		rotate([90,0,0]) letter();
		rotate([90,0,90]) letter();
		rotate([90,0,180]) letter();
		rotate([90,0,270]) letter();
		corner();
		rotate([90,0,0]) corner();
		rotate([180,0,0]) corner();
		rotate([270,0,0]) corner();
		rotate([0,180,0]) corner();
		rotate([90,180,0]) corner();
		rotate([180,180,0]) corner();
		rotate([270,180,0]) corner();
	  }
	  if(helper_tabs) translate([0,0,-6]) cylinder(h=0.15, r=10);
	}
    translate([0,0,-7]) cylinder(h=9, r=3.926, $fn=6);
  }
}

module letter() translate([0,0,6]) {
scale([0.9,0.9,1])
translate([-the_font[0][0]/2, -y_shift/2, -0.5])
linear_extrude(height=1)
        polygon(points=the_font[2][the_indicies[0]][6][0], paths=the_font[2][the_indicies[0]][6][1]);
}

module corner() translate([4,-6,-6])  {
    cube(4, center=true);
    translate([2,2,0]) cube(4, center=true);
    translate([2,0,2]) cube(4, center=true);
}

// Replicator 2 Build Plate to check layout
module build_plate(){
color("gold") translate([0,0,-4]) cube([280, 150, 8], center = true);
}

```


[User]
Okay, I'm looking to design a container, specifically a powder container for kyudo, Japanese archery. It's going to have a lid and a body that fit together. I need it to be parametric, so I can easily change dimensions.

Here's what I'm thinking:

*   **Parts:** I need to be able to choose if I want to generate just the container, just the lid, or both together.
*   **Variants:** There are two common sizes I need to support, a smaller one called "giriko-ire" and a larger one called "fudeko-ire," and also an even larger size. The giriko-ire is about 22mm in diameter, the fudeko-ire about 30mm, and a large fudeko-ire is about 35mm.
*   **Shape:** I'd like to be able to choose the number of sides for the container's cross-section.  I'd like options for 8 sides, 12 sides, or perfectly round (using 100 sides for the approximation) .
*   **Wall Thickness:** I need to control how thick the walls are, probably somewhere between 1 and 4mm.
*   **String Hole:** It needs a small hole for a string, the diameter of which I should be able to set, with options for 0mm (no hole) and up to 5mm.
*   **Hole:** It should have a hole on the side, also with options for 0mm and up to 5mm diameter.
*  **Tolerance:** The fit between the lid and the body needs to be adjustable. I want to be able to set the tolerance, starting around 0.05mm and going up to 0.5mm.

The container has a cylindrical base, and the lid fits over this, with an overlap section to keep it in place. The height of the container section should be about 2.5 times the diameter.  There should be a slight overlap between the lid and the container so that the lid stays on.

I'd like the OpenSCAD file to be easy to modify, with clear comments, and I need all the measurements to be in millimeters. I'd like the file to use the OpenSCAD language and be entirely self contained (no libraries).

[Assistant]
ire.scad:
```
// Which parts would you like to see?
part = "both"; // [container:Container Only,lid:Lid Only,both:Both Container and Lid]

// What type of container would you like to make?
variant = 30; // [22:Giriko-ire(22mm),30:Fudeko-ire(30mm),35:Large Fudeko-ire(35mm)]
variant_radius=variant/2;

// How many sides?
shape = 8; // [8:Eight sides,12:Twelve sides,100:Round]

// How thick should the walls be? (mm)
wall_thickness = 2; // [1:4]

// Diameter of the string hole. (mm)
string_hole_diameter = 3; // [0:No hole,1:1mm,1.5:1.5mm,2:2mm,3:3mm,4:4mm,5:5mm]

// Diameter of the hole.
hole_diameter = 2; // [0:No hole,1:1mm,1.5:1.5mm,2:2mm,3:3mm,4:4mm,5:5mm]

// How much tolerance between the lid and container?
tolerance = 0.05; // [0.05,0.06,0.07,0.08,0.09,0.1,0.15,0.2,0.3,0.4,0.5]

angle_between_holes = shape==100?45:(360/shape);

half_angle_between_holes=angle_between_holes/2;

hole_radius = hole_diameter==0?0:hole_diameter/2;
string_hole_radius = string_hole_diameter==0?0:string_hole_diameter/2;

height = variant*2.5;
segment = height/3;
overlap = segment-(string_hole_diameter+4);

print_part();

module print_part() {
	if (part == "container") {
		container();
	} else if (part == "lid") {
		lid();
	} else if (part == "both") {
		both();
	} else {
		both();
	}
}

module both() {
	translate([-(variant_radius+1), 0, 0]) container();
	translate([variant_radius+1, 0, 0]) lid();
}

module container() {
	difference(){
		union(){
			//outer shape
			cylinder(r=variant_radius, h=segment*2, $fn=shape);
			//overlap cylinder
			translate([0, 0, segment*2]) cylinder(r=variant_radius-(wall_thickness+1+tolerance), h=overlap, $fn=100);
		}
		// inside of container
		translate([0, 0, string_hole_diameter+5])cylinder(r=variant_radius-(wall_thickness+1+tolerance)-2, h=(segment*2)+overlap+2, $fn=100);
		// hole
		translate([0, 0, segment*2+(segment/3)]) rotate([90,0,half_angle_between_holes+angle_between_holes+90]) cylinder(r=hole_radius, h=variant_radius+1, $fn=20);
		// marker
		translate([0, 0, segment*2-(segment/3)]) rotate([90,0,half_angle_between_holes+angle_between_holes+90]) translate([0,0,variant_radius-2]) cylinder(r=hole_radius, h=variant_radius+1, $fn=20);
		// string hole
		translate([0, 0, string_hole_radius+2]) rotate([90,0,half_angle_between_holes]) cylinder(r=string_hole_radius, h=variant+1,center=true, $fn=20);

	}
}

module lid() {
	difference(){
		// outer shape
		cylinder(r=variant_radius, h=segment, $fn=shape);
		// cut-out cylinder
		translate([0, 0, string_hole_diameter+4]) cylinder(r=variant_radius-(wall_thickness+1), h=overlap+1, $fn=100);
		// hole
		translate([0, 0, segment/3*2]) rotate([90,0,half_angle_between_holes+90]) cylinder(r=hole_radius, h=variant_radius+1, $fn=20);
		// string hole
		translate([0, 0, string_hole_radius+2]) rotate([90,0,half_angle_between_holes]) cylinder(r=string_hole_radius, h=variant+1,center=true, $fn=20);
	}
}

```