[User]
Okay, I'm looking to design a stopper clamp, similar to the one I found on Thingiverse (thing:148571), but I need it to be fully parametric so I can easily adjust it for different pole and rope sizes, as well as fine-tune the grip and flexing behavior.

The basic idea is a clamp that uses a double overhand noose for self-tightening, combined with a rubber insert for extra grip on poles. I need this to be able to handle fairly high axial loads, say up to 15kg, but I'd like to be able to tune the design for potentially greater or lesser loads.

Here's a breakdown of the key features I need to be able to control via parameters:

*   **Pole Diameter (`dpolestage`):** This is the diameter of the pole the clamp will grip. It needs to be a parameter so I can adjust it for different poles. There should also be a small offset for the rubber insert. The original design uses `dpolestage3 = 24`, so I need to be able to specify something like `dpolestage = 24` as well as be able to use it for diameters both larger and smaller.
*   **Rubber Thickness (`trubber`):** The thickness of the rubber insert. This will affect the grip and amount of compression. In the original this was set to 3, but needs to be tunable.
*   **Main Part Thickness (`t0`):** The thickness of the main clamp body. This will affect how much it flexes. The original design had `t0 = 3`. I need to be able to adjust this parameter to make the clamp more flexible or stiffer.
*   **Main Parts Height (`hsqueezer`):** The overall height of the main body. The original design had `hsqueezer = 30`. This might be something I want to tweak if I need a taller or shorter clamp.
*   **Rope Diameter (`dropehole`):** The diameter of the hole where the rope passes through. The original design has `dropehole = 5`. I need to control this to match different rope sizes.
*  **Rope Hole Guide Thickness (`tropehole`):** The thickness of the guide around the rope hole. The original design had `tropehole = 4`.
*   **Number of Flex Cuts (`n`):** The number of flex cuts in the clamp. The original design had `n=12`.
*   **Opening Angle (`angle`):** The opening angle between the two sides of the clamp. The original used `angle = 120`. I would like to be able to change the angle of the opening, potentially to dial in grip and release properties.

The design should include the following parts:

*   A main body with flex cuts
*   An internal cut matching pole diameter
*   A recess for the rubber insert
*   A rope hole with a guide torus and a partial opening on both sides for knot management
*   Beveled edges around the rope opening.

I don't need a specific library, and the basic primitives should be enough. Also, it would be ideal if the code was well-commented so I can easily understand the structure. I am not requesting any specific rendering options.

Thanks!

[Assistant]
stopperclamp3.scad:
```

// author:   Lukas Süss aka mechadense
// released: 2013
// title:    Stopper Clamp
// license:  CC-BY

/*
This clamp can be used to pull on slippery poles.
Use a double overhand noose to tie a self tightening loop.
http://en.wikipedia.org/wiki/Double_overhand_noose
Due to the integration of a of rubber inlet and the loops self tightening, high axial load compoments can be held (~15kg tested). Untying is easy: You can take the loop out of the goove over the tip of the rod and pull the loop to zero to let the knot vanish.

It can be used inconjunction with
Block and Tackle - customizable: http://www.thingiverse.com/thing:148571
To lift up really long (12m) poles. I've succesfully tested this with a telescopic rod originally indended for cleaning equipment:
http://www.wischmop-shop.de/teilige-profi-teleskopstange-12meter-gleitstein-p-335.html

A butterfly loop can be used for sideward stabilizing ropes.
Alternatively one could add eylets to this thing.
*/

// resolution: maximal angle per vertex (overridable by $fs)
$fa = 5;
// resolution: minimal size per vertex
$fs = 0.2;

// pole diameter (subtract 1mm for preload)
dpolestage3 = 24;
rpolestage3 = dpolestage3/2;

// main part thickness
t0 = 3;  // Flexing vs maximal pulling force 2.5...very soft
// thickness of the rubber sheet you're goint to use
trubber = 3; // 4 was wrong

// main parts height
hsqueezer = 30;

// rope diameter (+ ~1mm)
dropehole = 5;
rropehole = dropehole/2;
// thickness of the giude
tropehole = 4;
rropeloop = rpolestage3+trubber+t0+rropehole;
// number of flexcuts (watch out to don't cut the bevelings away)
n = 12;

// opening angle
angle = 120; // 135 was too much.
overangle = (180-angle)/2;

difference()
{
  union()
  {
    unflexing();
    // round off
    translate([0,0,hsqueezer/2+dropehole/2])
      torus(tropehole/2,rropeloop+dropehole/2+tropehole/2);
  }
  // inserting cut - tweak angle !!
  scale([tan(overangle),1,1])
    translate([0,0,-50]) rotate(-45,[0,0,1])
      cube([100,100,100]);
  // flexing cuts:
  for(i=[-3:3])//for(i=[0:n-1])
  {
    hull()
    {
      rotate(360/n*i,[0,0,1])
        translate([-(rpolestage3+trubber+t0),0,0])
          cylinder(r=1,h=hsqueezer*1.2);
      rotate(360/n*i,[0,0,1])
        translate([-(rpolestage3+trubber+t0)-10,0,0])
          cylinder(r=2,h=hsqueezer*1.2);
    }
    //cylinder(r=1,h=hsqueezer*1.2);
      rotate(360/n*i+360/2/n*0,[0,0,1])
        translate([-(rpolestage3+trubber/2),0,-1])
          cylinder(r=trubber/2,h=hsqueezer*1.2);
  }
  // breaking edges
  rotate(-overangle-0.05,[0,0,1]) translate([0,rropeloop,0])
    translate([0,0,hsqueezer/2-rropehole]) rotate(-90,[0,1,0])
      hull()
      {
        cylinder(r1=rropehole+1.5,r2=rropehole,h=1.5);
        translate([2*dropehole,0,0])
        cylinder(r1=rropehole+1.5,r2=rropehole,h=1.5);
      }
  rotate(+overangle+0.05,[0,0,1]) translate([0,-rropeloop,0])
    translate([0,0,hsqueezer/2-rropehole]) rotate(-90,[0,1,0])
      hull()
      {
        cylinder(r1=rropehole+1.5,r2=rropehole,h=1.5);
        translate([2*dropehole,0,0])
        cylinder(r1=rropehole+1.5,r2=rropehole,h=1.5);
      }
}

module unflexing()
{
  difference()
  {
    hull()
    {
      // main body
      bcylinder(rpolestage3+trubber+t0,hsqueezer,2);
      // rope channel body
      translate([0,0,hsqueezer/2])
        elongorus(rropehole+tropehole,rropeloop,dropehole);
    }
    //cut for the pole
    translate([0,0,-hsqueezer*0.1])
      cylinder(r=rpolestage3+1.5,h=hsqueezer*1.2);

    // cut for the rubber inlet
    translate([0,0,+t0])
      bcylinder(rpolestage3+trubber,hsqueezer-2*t0,2);

    // rope channel
    translate([0,0,hsqueezer/2+50/2])
      elongorus(rropehole,rropeloop,dropehole+50);

    // open up ropeholder
    difference()
    {
      translate([0,0,hsqueezer/2+dropehole/2]) cylinder(r=100,h=100);
      translate([0,0,hsqueezer/2-1]) cylinder(r=rropeloop,h=100);
    }

  }
}

module bcylinder(rr,hh,b=1)
{
  cylinder(r1=rr-b,r2=rr,h=b);
  translate([0,0,b]) cylinder(r=rr,h=hh-2*b);
  translate([0,0,hh-b]) cylinder(r1=rr,r2=rr-b,h=b);
}

module torus(r1,r2)
{
  rotate_extrude(convexity=4)
  translate([r2,0,0])
    circle(r=r1);
}
module elongorus(r1,r2,l)
{
  rotate_extrude(convexity=4)
  translate([r2,0,0])
    hull()
    {
      translate([0,l/2,0]) circle(r=r1);
      translate([0,-l/2,0]) circle(r=r1);
    }
}

```


[User]
Okay, I'd like to request a parametric OpenSCAD design for a book ring. I've already got a basic design and some parameters I like, but I want a more robust and flexible version, and I'm having trouble with the customizer in Thingiverse. I'm also using the `write/Write.scad` library for the text.

Here's a description of what I want, based on my existing code:

The basic shape is a ring with a gap, and two wing-like extensions on either side that meet up with the ring to form a loop. The main body of the ring is a cylinder with a hole cut out of the center. Then there are two "wings" that are essentially a curved path of connected cylinders that form a larger loop. These wings are symmetrical on each side of the main ring.

Here are the parameters I want to control:

*   **`thumb_radius`**: The inner radius of the main ring cylinder. Think of this as the main thumb-hole size.
*   **`thumb_move`**: How much to shift the main ring cylinder along the Y axis. This is for small adjustments to the position of the thumb hole.
*   **`wall`**: The thickness of the ring walls.
*   **`height`**: The height/thickness of the entire object along the Z axis.
*   **`winglength`**: The overall length of each wing extension.
*   **`angle`**: The angle at which the wing starts.
*   **`text_left`**: The text on the left side of the book ring.
*   **`textdepth`**: The depth of the text
*   **`move_textleft_x`**: The X coordinate of the text on the left side.
*   **`move_textleft_z`**: The Z coordinate of the text on the left side.
*   **`size_textleft`**: The height of the text on the left side.
*   **`text_right`**: The text on the right side of the book ring.
*   **`move_textright_x`**: The X coordinate of the text on the right side.
*   **`move_textright_z`**: The Z coordinate of the text on the right side.
*    **`size_textright`**: The height of the text on the right side.
*   **`$fn`**: The number of fragments used to create a circle. I'd like to keep the ability to control the smoothness.

Here are some specific points about the design that are important:
*   The main ring is created by subtracting a cylinder from another cylinder, both placed at an offset specified by `thumb_move`.
*   The wings are created by creating a hull around 3 cylinders.
*   The additional structures on the wings are created by intersecting the wing hull with an additional cylinder.
*   The text uses the `write()` function from `write/Write.scad`
*   The text is rotated 90 degrees before it is projected on to the surface.
*   The left side's wing and text are mirrored along the X axis.

I'm happy with the core logic of how it's built, but I want it to be written cleanly and with good parametric control. I'm also curious if there's a better way to generate the additional structure without using the intersection method. It seems like there might be a way to do it with just `hull()` and `difference()` but I'm not sure.

I'm also interested if there is a better way of placing the text so that it always lines up nicely with the ring.

Could you help me generate a well-structured, parametric OpenSCAD file based on this description? Thanks!

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

thumb_radius = 11.5; 			//11.5
thumb_move = 0;	 			//0
wall = 2;					//2
height = 14;					//14
winglength = 43;				//43
angle = 10;					//10
text_left = "eine kleine";
textdepth = 0.5;				//0.5
move_textleft_x = 3;			//5
move_textleft_z = 5;			//5
size_textleft = 5;			//5
text_right = "Leseratte";
move_textright_x = 5;			//5
move_textright_z = 5;			//5
size_textright = 5;			//5

$fn = 50+0;					//50

bookring(thumb_radius, wall, height);

module bookring(thumb_radius, wall, height) {
	difference() {
		union() {
			translate([0, (thumb_radius + (wall / 2)) +thumb_move, 0])
				cylinder(r = (thumb_radius + wall), h = height);
			rotate([0, 0, angle])
				difference() {
					union() {
						wing();
						additionalStructur((thumb_radius * 2), ((thumb_radius * 2) + wall));
						additionalStructur((winglength - wall), (winglength * 2));
					}
					translate([+move_textright_x, -wall + textdepth, move_textright_z])
						rotate([90, 0, 0])
							write(text_right, t = textdepth*2, h = size_textright, center = false);
				}
			rotate([0, 0, (-angle)])
				difference() {
					mirror([1, 0, 0]) {
						wing();
						additionalStructur((thumb_radius * 2), ((thumb_radius * 2) + wall));
						additionalStructur((winglength - wall), (winglength * 2));
					}
					translate([(-winglength)+move_textleft_x, -wall + textdepth, move_textleft_z])
						rotate([90, 0, 0])
							write(text_left, t = textdepth*2, h = size_textleft, center = false);
				}
		}
		translate([0, (thumb_radius + (wall / 2)) +thumb_move, 0])
			cylinder(r = thumb_radius, h = height);
	}
}

module wing() {
	difference() {
		hull() {
			cylinder(r = wall, h = height);
			translate([winglength, 0, 0])
				cylinder(r = wall, h = height);
			translate([0, (thumb_radius * 1.5), 0])
				cylinder(r = wall, h = height);
		}
		hull() {
			cylinder(r = 0.1, h = height);
			translate([winglength, 0, 0])
				cylinder(r = 0.1, h = height);
			translate([0, (thumb_radius * 1.5), 0])
				cylinder(r = 0.1, h = height);
		}
	}
}

module additionalStructur(innerradius, outerradius) {
	intersection() {
		hull() {
			cylinder(r = wall, h = height);
			translate([winglength, 0, 0])
				cylinder(r = wall, h = height);
			translate([0, (thumb_radius * 1.5), 0])
				cylinder(r = wall, h = height);
		}
		difference() {
			translate([0, thumb_radius, 0])
				cylinder(r = outerradius, h = height);
			translate([0, thumb_radius, 0])
				cylinder(r = innerradius, h = height);
		}
	}
}

```


[User]
Okay, I'm looking to design a custom sink drainer using OpenSCAD, and I'd like your help creating a parametric design. I've experimented a little already, but I'm hoping you can create something more robust.

Here’s what I'm aiming for:

**Basic Shape:** The drainer should be a flat, circular disc with a lip that extends downwards to create a "dip" into the sink. This dip is important as it provides space for water and debris to collect. I want the main disc to have a flat top surface and the lip should create a consistent depth.

**Holes:** The drainer will have a pattern of circular holes for drainage. These holes should be arranged in concentric circles, with each circle having evenly spaced holes. I need control over both the spacing *between* the circles and the spacing *around* each circle.

**Parameters:** I need these parameters to be easily adjustable:
*   **`thick`**: The thickness of the main disk part of the drainer.
*   **`o_rad`**: The overall outer radius of the drainer.
*   **`i_rad`**: The radius of the inner edge of the flat disk, where the "dip" starts.
*   **`h_rad`**: The radius of each drainage hole.
*   **`h_r_pitch`**: The radial distance (pitch) between the concentric circles of holes.
*   **`h_c_pitch`**: The circumferential spacing (pitch) between holes around each circle.
*   **`dipdepth`**: How deep the lip should extend downwards from the flat top of the main disk, creating the dip.

**Functionality:**

*   The design should properly handle cases where the inner radius doesn't align exactly with the hole pitch (the innermost circle of holes should be correctly positioned).
*   The holes should extend through the entire thickness of both the main disk and the lip.
*   I’d like the code to use a rotation extrusion for the main body. It felt efficient to me and should be easy for others to understand.
*   It would be ideal if the code was relatively easy to understand and modify, and doesn’t rely on overly complicated logic. I'd like the design to avoid any unnecessary complexity.

I'm not asking for anything too fancy like handles or special patterns; this is meant to be a straightforward, functional drainer replacement.

I don't need any specific libraries, although I am familiar with the common mathematical functions like `sin`, `cos`, `floor`, `circ` etc. It should be possible to do everything with the base OpenSCAD language.

Can you provide me with an OpenSCAD file that meets these requirements?

[Assistant]
drainer.scad:
```
/* Strainer by Simon Peters */
/* Available under Creative Commons Share-alike licence */
/*[Global]*/
//Strainer thickness
thick = 1; //[2:10]
// Outer radius
o_rad = 50; //[20:200]
// Inner radius
i_rad = 35;	//[20:200]
// Strainer hole radius
h_rad = 1;	 //[0.5:10]
// Hole circle radius pitch
h_r_pitch = 4; //[1:30]
// Hole circle circumference pitch
h_c_pitch = 4; //[1:30]
// Drainer Dip Depth
dipdepth = 18; //[0:100]

/*[Hidden]*/
pi = 3.14159;
real_i_rad=floor(i_rad/h_r_pitch)*h_r_pitch;
hthick=h_r_pitch/real_i_rad*dipdepth;

function circ(r)=2*pi*r;
function nh(r) = floor(circ(r) / h_c_pitch);

difference(){
	create_disk();
	create_holes();
}
module create_holes() {
//$fn=12;
	for (r = [0 : h_r_pitch : real_i_rad ]) {
		translate([0,0,0-(dipdepth+1)]) {
			cylinder(h=thick+dipdepth+2,r=h_rad);
			for (c = [0 : circ(r)/nh(r): circ(r) ]) {
				translate ([sin((c/circ(r))*360)*r,cos((c/circ(r))*360)*r, 0]) {
					cylinder(h=thick+dipdepth+2,r=h_rad);
				}
			}
		}
	}
}
module create_disk() {
		rotate_extrude(convexity=36)
		polygon(points=[[0,0-dipdepth],[real_i_rad,0],[o_rad,0],[o_rad,thick],[real_i_rad,thick],[0,thick-dipdepth]],paths=[[0,1,2,3,4,5]]);
}
```


[User]
Okay, so I'm trying to prevent myself from accidentally hitting the freezer switch. It's a standard light switch, and I want to design a cover that goes over it to stop me knocking it off when I move my bike around.

I've found this existing OpenSCAD file that's pretty close to what I need, but it's not quite as flexible as I'd like. I'm hoping you can help me make a parametric version of it, so I can easily adjust it for different switch sizes if I need to.

Here's what the existing design does and what I'd like:

**Current Design (based on the provided SCAD file):**

*   It's a rectangular box that fits over the existing switch.
*   It has a cutout at the front for the light switch itself, so you can still operate it if you need to (though the main purpose is to *stop* it from being operated accidentally).
*   It includes little clips on the inside edges that should help it hold onto the switch plate.
*   The cover has a sort of bulge on the outside, and it's tapered.

**My Requirements for the Parametric Design:**

1.  **Switch Dimensions:** I want to be able to specify the height, depth and width of the light switch itself, and the height of the bottom of the switch relative to the wall. These are currently `HeightOfSocket`, `DepthOfSocket`, `WidthOfSwitch`, `DepthOfSwitch`, and `HeightToBottomOfSwitch` in the existing code.

2.  **Cover Dimensions:** I need to control the height and length of the main cover section itself. Currently, these are set with `HeightOfCover` and `LengthOfCover`, but I want them to be parameters. I also need to control the thickness of the cover walls and how much extra width there is around the switch (`Thickness` and `WidthExtraMargin` in the existing file).

3.  **Taper:** The taper is important to make it printable without too much overhang, so it needs to be customisable with a parameter. The existing file uses `Taper` for this.

4.  **Clips:** I want to keep the clips, and I need parameters for their length and thickness. The existing file uses `ClipLength` and `ClipThickness`. I should also be able to toggle if the clips are generated or not.

5.  **Fillet:** There are fillets at the corners of the cover, and I want to control the radius of these. The current code uses `FilletRadius` for this.

6.  **General Tolerance:** I need to be able to easily adjust the general tolerance around the switch so that it's not too tight, which is done using `WidthExtraMargin`

7. **Parametric Angles**: Rather than using fixed values for calculating rotation of the tapering parts of the cover, I'd like those to also be controlled by parameters for easier tweaking.

8. **Parametric fillet angles**: Rather than using fixed values for calculating rotations of the fillets, I'd like those to be parametrically defined for easy tweaking.

9. **Include fillets**: I want a boolean parameter to control if the fillets are generated or not.

Basically, I'd like to be able to adjust all the dimensions in the original file, and potentially include some extra customisation like those added above. The main goal is to have a single parametric file I can adjust for my needs now, and easily adjust in future if I change my switches.

Can you generate the OpenSCAD file for me using all these parameters? Also, can you please generate this code in a way that doesn't require any external libraries (such as MCAD, BOSL, BOSL2, dotSCAD, NopSCADlib or BOLTS), so that I can use the code directly, without downloading extra libraries?

[Assistant]
SwitchCover.scad:
```
// Switch cover
// Paul Murrin - Sept 2013

// (mm)
HeightOfSocket = 87;
// (mm)
DepthOfSocket = 11.5;
// (mm)
HeightToBottomOfSwitch = 48;
// (mm)
WidthOfSwitch = 10;
// (mm)
DepthOfSwitch = 5;
// The clip helps to grip the switch plate. If not possible, use blue tack.
IncludeClips = true;

/* [Hidden] */

Thickness = 1;			// Thickness of cover
WidthExtraMargin = 0.5;	// Additional tolerance on width of cover.
Taper = 1.2;				// Amount which switch cover tapers (helps make it printable without massive overhang)
ClipLength = Thickness + 1.2;	// Length of clip that helps hold it on
ClipThickness = 0.5;
WidthAtBase = WidthOfSwitch + 2*WidthExtraMargin + 2*Taper;
HeightOfCover=DepthOfSwitch+7;	// Height of the inside of the cover
LengthOfCover=40;	// Length of the inside of the cover
HeightToStartOfCover = HeightToBottomOfSwitch - 5 - Thickness;
FilletRadius = 2;
$fa=5;

rotate([0,90,0])
	union()
	{
		// Main body and cutout
		difference()
		{
			cube([WidthAtBase, HeightOfSocket+2*Thickness, DepthOfSocket + Thickness]);
			translate([0,Thickness,0])
				cube([WidthAtBase, HeightOfSocket, DepthOfSocket]);
			// Cutout for coverplate
			translate([0,Thickness + HeightToStartOfCover,DepthOfSocket])
				cube([WidthAtBase, LengthOfCover+2*Thickness, Thickness]);
		}

		// Clips to grip coverplate
		if (IncludeClips)
		{
			translate([0,0,-ClipThickness])
				cube([WidthAtBase, ClipLength, ClipThickness]);
			translate([0,HeightOfSocket+2*Thickness-ClipLength,-ClipThickness])
				cube([WidthAtBase, ClipLength, ClipThickness]);
		}

		// Cover bulge
		translate([0,HeightToStartOfCover+Thickness,DepthOfSocket])
		{
			difference()
			{
				union()
				{
					intersection()
					{
						translate([0,LengthOfCover/2+Thickness,(HeightOfCover+Thickness)-100])
							rotate([0,90,0])
								cylinder(r=100, h=WidthAtBase);
						cube([WidthAtBase,LengthOfCover+2*Thickness,HeightOfCover+Thickness]);
					}
					// Fillet at top
					translate([0,LengthOfCover+2*Thickness,Thickness])
						difference()
						{
							cube([WidthAtBase,FilletRadius,FilletRadius]);
							translate([-0.01,FilletRadius,FilletRadius])
								rotate([0,90,0])
									cylinder(r=FilletRadius, h=WidthAtBase+0.02, $fn=60);
						}
					// Fillet at bottom
					translate([0,-FilletRadius,Thickness])
						difference()
						{
							cube([WidthAtBase,FilletRadius,FilletRadius]);
							#translate([-0.01,0,FilletRadius])
								rotate([0,90,0])
									cylinder(r=FilletRadius, h=WidthAtBase+0.02, $fn=60);
						}

				}
				// Taper the cover
/*				translate([WidthAtBase,-FilletRadius, 0])
					rotate([0,-atan2(Taper, HeightOfCover+Thickness),0])
						cube([Taper,LengthOfCover+2*Thickness+2*FilletRadius,HeightOfCover+Thickness+10]);
				translate([-Taper,-FilletRadius, 0])
					rotate([0,atan2(Taper, HeightOfCover+Thickness),0])
						cube([Taper,LengthOfCover+2*Thickness+2*FilletRadius,HeightOfCover+Thickness+10]);
*/
				// Cutout inside of cover
				difference()
				{
					intersection()
					{
						translate([Thickness,(LengthOfCover/2)+Thickness,HeightOfCover-100])
							rotate([0,90,0])
								cylinder(r=100, h=WidthAtBase);
						translate([Thickness,Thickness, 0])
							cube([WidthAtBase-2*Thickness,LengthOfCover,HeightOfCover]);
					}
					// Taper the cover
					translate([WidthAtBase-Thickness,Thickness, 0])
						rotate([0,-atan2(Taper, HeightOfCover+Thickness),0])
							cube([Taper,LengthOfCover,HeightOfCover+10]);
					translate([Thickness-Taper,Thickness, 0])
						rotate([0,atan2(Taper, HeightOfCover+Thickness),0])
							cube([Taper,LengthOfCover,HeightOfCover+10]);
				}

			}
		}

	}

```


[User]
Okay, I've been working on this model of the WhiteKnightTwo aircraft in OpenSCAD, and it's getting pretty complex. I've got a basic version working using a lot of `hull()` functions, but it's not very elegant and difficult to tweak. I'm hoping you can help me design a better, more parametric version from scratch.

Here's what I'm aiming for:

**Overall Structure:**

The model should represent the WhiteKnightTwo aircraft, which has a distinctive twin-fuselage design connected by a central wing. I need to be able to easily adjust the dimensions of the various components. The scale of the final model is not yet determined, but I need to be able to scale everything. Ideally the user should be able to define these dimensions in mm and scale it after. I currently have a scale function, but i want something better.

**Key Components and Parameters:**

*   **Fuselage:**
    *   **Nose:** Should be a smooth, tapered nose. I need to be able to control its diameter (`NoseDiameter`) and length (`NoseLength`).
    *   **Cabin:** The main body section with two distinct portions. The lower cabin section (`CabinLowerDiameter`), the height offset (`CabinUpperHeightOffset`), and the length (`CabinLength`) need to be adjustable.
        * The cabin body should be connected to the tail, and the nose, with the front of the cabin also needing to connect to the wing.
    *   **Tail:** A smaller diameter fuselage that connects to the end of the cabin. It needs its diameter (`tailDiameter`), and height offset from the main body axis (`tailHeightOffset`) to be adjustable. There needs to be the ability to adjust the length of the rear fuseloge, which is currently the `LeghtOfFuseloge` parameter.
*   **Elevator:**
    *   This horizontal tail surface needs to have adjustable maximum and minimum depths (`ellMaxDepth`, `ellMinDepth`), widths (`ellMaxWidth`, `ellMidWidth`), and thicknesses (`ellMaxThickness`, `ellMinThickness`). It also needs a height offset from the tail (`ellHeightOffset`) and an X offset from the tail end (`ellXOffset`). This should connect to the tail.
*   **Vertical Tail:**
    *   The vertical tail needs a top depth (`topTailDepth`), a bottom triangle depth (`bottomTailTriangleDepth`), a max and min thickness (`tailMaxThickness`, `tailMinThickness`), a height (`tailHeight`), a top offset (`tailTopOffset`), and a cutout radius (`tailCutoutRadius`). This should be able to connect to the tail.
*   **Wing:**
    *   The main wing needs to connect to both fuselages at an offset from the front of the fuselage (`fusalageOffset`). The wing needs adjustable depth (`wingDepth`), max and min thickness (`wingMaxThickness`, `wingMinThickness`), tip depth (`wingTipDepth`) and span (`wingSpan`).

**Specific Requests:**

1.  **Parametric Design:** I want a fully parametric design where all the dimensions I mentioned above can be easily adjusted at the beginning of the script. I don't want to have to dig into the code to change values.
2.  **Clean Construction:** I want to avoid excessive use of `hull()` where possible. I think there are better ways to create the smooth, blended shapes using cylinders, spheres and extrusions.
3.  **Modular Structure:** The design should be modular, so that I can adjust components separately. For example, I would like to be able to move one of the fuselages in the Y axis without it breaking the rest of the code.
4. **Better Scaling:** I would like a better way of scaling the model. I have been using a simple scale function for this but I want something more parametric where I can have a general size/scale, and then have the option of changing individual parts.
5.  **Wing Shape:** the wing is a particular concern since it is currently relying on multiple hulls, and looks very blocky. Can you make this look cleaner, and follow the WhiteKnightTwo's slightly tapered shape better?

**Libraries:**

I don't need any specific external libraries for this, but if it makes sense to use one to simplify the process, I am open to it.

**Output:**

I would like the output to be a single `.scad` file.

I think that covers all the requirements. Let me know if you have any questions.

[Assistant]
WhiteKnight2V2.scad:
```
/*[scale]*/
modelScale=.04166667;
/*[fusalage Parameters]*/
NoseDiameter=12.3;
NoseLength=73.8;
CabinLowerDiameter=61.5;
CabinUpperHeightOffset=21.525;
CabinLength=184.5;
LeghtOfFuseloge=738.0;
tailDiameter=12.3;
tailHeightOffset=18.45;
/*[ellivator Parameters]*/
ellMaxDepth=55.35;
ellMinDepth=30.75;
ellMaxWidth=258.3;
ellMidWidth=246.0;
ellMaxThickness=6.15;
ellMinThickness=3.075;
ellHeightOffset=-15.375;
ellXOffset=33.825;
/*[Tail Parameters]*/
topTailDepth=43.05;
bottomTailTriangleDepth=92.25;
tailMaxThickness=6.15;
tailMinThickness=3.075;
tailHeight=159.9;
tailTopOffset=24.6;
tailCutoutRadius=30.75;
/*[Wing Parameters]*/
fusalageOffset=399.75;
wingDepth=86.1;
wingMaxThickness=15.375;
wingMinThickness=6.15;
wingTipDepth=61.5;
wingSpan=1322.25;

modelScale=modelScale*10;

module wing(){
	translate([0,0,wingMaxThickness/2])union(){
		union(){
			hull(){
				translate([-CabinLength,CabinLowerDiameter/2,CabinLowerDiameter/2+CabinUpperHeightOffset*2])sphere(wingMaxThickness/2);
				translate([-CabinLength,-CabinLowerDiameter/2,CabinLowerDiameter/2+CabinUpperHeightOffset*2])sphere(wingMaxThickness/2);
				translate([-CabinLength-wingDepth,CabinLowerDiameter/2,CabinLowerDiameter/2+CabinUpperHeightOffset*2])sphere(wingMinThickness/2);
				translate([-CabinLength-wingDepth,-CabinLowerDiameter/2,CabinLowerDiameter/2+CabinUpperHeightOffset*2])sphere(wingMinThickness/2);
			}
			translate([-CabinLength-wingDepth,0,CabinLowerDiameter/2+CabinUpperHeightOffset*2-CabinLowerDiameter/2-wingMaxThickness/2])difference(){
				translate([0,-CabinLowerDiameter/2,0])cube([wingDepth,CabinLowerDiameter,CabinLowerDiameter/2+wingMaxThickness/2]);
				translate([-wingDepth/2,0,0])rotate([0,90,0])cylinder(r=CabinLowerDiameter/2,h=2*wingDepth);
			}
		}
		hull(){
			translate([-CabinLength,CabinLowerDiameter/2,CabinLowerDiameter/2+CabinUpperHeightOffset*2])sphere(wingMaxThickness/2);
			translate([-CabinLength,fusalageOffset/2-CabinLowerDiameter/2,CabinLowerDiameter/2+CabinUpperHeightOffset])sphere(wingMaxThickness/2);

			translate([-CabinLength-wingDepth,CabinLowerDiameter/2,CabinLowerDiameter/2+CabinUpperHeightOffset*2])sphere(wingMinThickness/2);
			translate([-CabinLength-wingDepth,fusalageOffset/2-CabinLowerDiameter/2,CabinLowerDiameter/2+CabinUpperHeightOffset])sphere(wingMinThickness/2);
		}

		hull(){
			translate([-CabinLength,-CabinLowerDiameter/2,CabinLowerDiameter/2+CabinUpperHeightOffset*2])sphere(wingMaxThickness/2);
			translate([-CabinLength,-fusalageOffset/2+CabinLowerDiameter/2,CabinLowerDiameter/2+CabinUpperHeightOffset])sphere(wingMaxThickness/2);

			translate([-CabinLength-wingDepth,-CabinLowerDiameter/2,CabinLowerDiameter/2+CabinUpperHeightOffset*2])sphere(wingMinThickness/2);
			translate([-CabinLength-wingDepth,-fusalageOffset/2+CabinLowerDiameter/2,CabinLowerDiameter/2+CabinUpperHeightOffset])sphere(wingMinThickness/2);
		}
		hull(){
			translate([-CabinLength,-fusalageOffset/2+CabinLowerDiameter/2,CabinLowerDiameter/2+CabinUpperHeightOffset])sphere(wingMaxThickness/2);
			translate([-CabinLength-wingDepth,-fusalageOffset/2+CabinLowerDiameter/2,CabinLowerDiameter/2+CabinUpperHeightOffset])sphere(wingMinThickness/2);
			translate([-CabinLength,-3*wingSpan/8,CabinLowerDiameter/2+CabinUpperHeightOffset])sphere(wingMaxThickness/2);
			translate([-CabinLength-wingDepth,-3*wingSpan/8,CabinLowerDiameter/2+CabinUpperHeightOffset])sphere(wingMinThickness/2);
		}

		hull(){
			translate([-CabinLength,fusalageOffset/2-CabinLowerDiameter/2,CabinLowerDiameter/2+CabinUpperHeightOffset])sphere(wingMaxThickness/2);
			translate([-CabinLength-wingDepth,fusalageOffset/2+-CabinLowerDiameter/2,CabinLowerDiameter/2+CabinUpperHeightOffset])sphere(wingMinThickness/2);
			translate([-CabinLength,3*wingSpan/8,CabinLowerDiameter/2+CabinUpperHeightOffset])sphere(wingMaxThickness/2);
			translate([-CabinLength-wingDepth,3*wingSpan/8,CabinLowerDiameter/2+CabinUpperHeightOffset])sphere(wingMinThickness/2);
		}

		hull(){
			translate([-CabinLength,3*wingSpan/8,CabinLowerDiameter/2+CabinUpperHeightOffset])sphere(wingMaxThickness/2);
			translate([-CabinLength-wingDepth,3*wingSpan/8,CabinLowerDiameter/2+CabinUpperHeightOffset])sphere(wingMinThickness/2);

			translate([-CabinLength-(wingDepth-wingTipDepth)/2,wingSpan/2,CabinLowerDiameter/2+CabinUpperHeightOffset])sphere(wingMaxThickness/2);
			translate([-CabinLength-wingDepth+(wingDepth-wingTipDepth)/2,wingSpan/2,CabinLowerDiameter/2+CabinUpperHeightOffset])sphere(wingMinThickness/2);
		}
		hull(){
			translate([-CabinLength,-3*wingSpan/8,CabinLowerDiameter/2+CabinUpperHeightOffset])sphere(wingMaxThickness/2);
			translate([-CabinLength-wingDepth,-3*wingSpan/8,CabinLowerDiameter/2+CabinUpperHeightOffset])sphere(wingMinThickness/2);

			translate([-CabinLength-(wingDepth-wingTipDepth)/2,-wingSpan/2,CabinLowerDiameter/2+CabinUpperHeightOffset])sphere(wingMaxThickness/2);
			translate([-CabinLength-wingDepth+(wingDepth-wingTipDepth)/2,-wingSpan/2,CabinLowerDiameter/2+CabinUpperHeightOffset])sphere(wingMinThickness/2);
		}

		translate([-CabinLength-wingDepth,fusalageOffset/2,CabinLowerDiameter/2+CabinUpperHeightOffset-CabinLowerDiameter/2-wingMaxThickness/2])difference(){
				translate([0,-CabinLowerDiameter/2,0])cube([wingDepth,CabinLowerDiameter,CabinLowerDiameter/2+wingMaxThickness/2]);
				translate([-wingDepth/2,0,0])rotate([0,90,0])cylinder(r=CabinLowerDiameter/2,h=2*wingDepth);
		}
		translate([-CabinLength-wingDepth,-fusalageOffset/2,CabinLowerDiameter/2+CabinUpperHeightOffset-CabinLowerDiameter/2-wingMaxThickness/2])difference(){
				translate([0,-CabinLowerDiameter/2,0])cube([wingDepth,CabinLowerDiameter,CabinLowerDiameter/2+wingMaxThickness/2]);
				translate([-wingDepth/2,0,0])rotate([0,90,0])cylinder(r=CabinLowerDiameter/2,h=2*wingDepth);
		}
	}
}

module tail(){
	translate([0,0,CabinLowerDiameter+CabinUpperHeightOffset])difference(){
		union(){
			translate([0,0,-CabinLowerDiameter-CabinUpperHeightOffset])hull(){
				sphere(tailMaxThickness/2);
				translate([topTailDepth-bottomTailTriangleDepth-tailTopOffset,0,tailHeight])sphere(tailMaxThickness/2);
				translate([-bottomTailTriangleDepth-tailTopOffset,0,tailHeight])sphere(tailMinThickness/2);
				translate([-bottomTailTriangleDepth,0,0])sphere(tailMinThickness/2);
			}

			translate([-ellXOffset,0,ellHeightOffset])hull(){
				sphere(ellMaxThickness/2);
				translate([ellMinDepth-ellMaxDepth,ellMidWidth/2,0])sphere(ellMaxThickness/2);
				translate([ellMinDepth-ellMaxDepth,-ellMidWidth/2,0])sphere(ellMaxThickness/2);
				translate([-ellMaxDepth,ellMaxWidth/2,0])sphere(ellMinThickness/2);
				translate([-ellMaxDepth,-ellMaxWidth/2,0])sphere(ellMinThickness/2);
			}
		}
		translate([0,tailMaxThickness,-CabinLowerDiameter-CabinUpperHeightOffset])rotate([90,0,0])cylinder(r=tailCutoutRadius,h=tailMaxThickness*2);
	}
}

module fuselage(){
union(){
		hull(){
			translate([NoseLength,0,0])sphere(NoseDiameter/2);
			rotate([0,270,0])cylinder(r=CabinLowerDiameter/2,h=CabinLength);
			translate([-LeghtOfFuseloge+NoseLength,0,tailHeightOffset])sphere(tailDiameter/2);
		}
		hull(){
			translate([-CabinLowerDiameter/2,0,CabinUpperHeightOffset])sphere(CabinLowerDiameter/2);
			rotate([0,270,0])cylinder(r=CabinLowerDiameter/2,h=CabinLength);
			translate([-wingDepth,0,CabinUpperHeightOffset])rotate([0,270,0])cylinder(r=CabinLowerDiameter/2,h=CabinLength);
translate([-wingDepth,0,CabinUpperHeightOffset/4])rotate([0,270,0])cylinder(r=CabinLowerDiameter/2,h=CabinLength);
		translate([-LeghtOfFuseloge+NoseLength,0,tailHeightOffset])sphere(tailDiameter/2);
		}
	translate([(ellMaxDepth+ellMinDepth)/2+NoseLength-LeghtOfFuseloge,0,tailHeightOffset-tailCutoutRadius])tail();
	}
}

scale([modelScale,modelScale,modelScale]){
union(){
translate([0,fusalageOffset/2,0])fuselage();
translate([0,-fusalageOffset/2,0])fuselage();
translate([0,0,-1])wing();
}
}
```


[User]
Okay, I'd like to design a parametric credit card wallet, something like a minimalist "elastic band" style wallet but made from a single piece of printed plastic. I've seen designs similar to this online, but I want a version I can tweak more easily.

Here's what I'm looking for:

**Overall Shape and Function:**

*   The wallet should be roughly rectangular but with curved edges. It should have a channel in the middle where the credit cards are held.
*   The basic function is to hold a stack of credit cards using tension. The cards will be held within the channel of the wallet and will rely on the flexibility of the plastic for this tension. The wallet should bend slightly to allow the cards to enter and stay secure.
*   The wallet should lock onto the cards when the tension is applied by closing the sides of the channel onto the cards.
*   It should also allow the cards to be easily removed by opening the sides of the channel.
*   The final design should have rounded edges.

**Parameters:**

I need the following parameters to be customizable in OpenSCAD:

*   `inner_thickness`: The thickness of the card holding channel. This is critical, as it determines how many cards the wallet will hold. It's the primary variable I'd be adjusting.
*   `increase_wall`:  A percentage value (0-100) to increase the wall thickness. I want to be able to slightly increase the strength of the walls if needed.
*   `inner_width`: The width of the card channel in its relaxed/unlocked position. This determines how easy it is to insert and remove cards.
*   `height`: The height of the wallet (perpendicular to the card's surface).
*  `card_width`: The width of the credit cards. While usually standard I would like to be able to change it if needed.
* `rounded`: The radius of the rounded edges of the wallet.
*   `overhang`: An angle that will determine how much the corners should extend into the wallet from a rounded corner, and how large they should be.

**Key Features of the Design:**

*   **Rounded corners and edges:** I want the wallet to have rounded edges for comfort and aesthetics, but with enough tension for the locking mechanism to still work well.
*   **Single print part:** The final design should be a single piece that is 3D printable.

**OpenSCAD specifics:**

*   Please make good use of the `minkowski()` and `difference()` functions to create the final geometry.
*  Please make good use of the `hull()` function as well.
*   Please use `$fa` and `$fs` for controlling smoothness.
*   Please make the design parametric as described above, such that I can alter the above parameters to customize it.

I think that's everything! Let me know if you need clarification.

[Assistant]
MicroWallet.scad:
```
// Title: Micro Wallet
// Author: http://www.thingiverse.com/Jinja
// Date: 14/9/2013

/////////// START OF PARAMETERS /////////////////

// The more cards you carry, the bigger this should be. This is the only thing you really need to change.
inner_thickness = 10;

// Percentage to increase wall thickness
increase_wall = 0; // [0:100]

// The inner width. This is the width of the clip in the unlocked position.
inner_width = 65; // [60:80]

// The height of the wallet
height = 8; //[6:30]

// The width of your credit cards. You only need to change this if you plan to use the holder for something other than credit cards.
card_width = 56;

/////////// END OF PARAMETERS /////////////////
rounded = 0.7*1;
overhang=45*1;

$fs=0.3*1;
//$fa=5*1; //smooth
$fa=8*1; //nearly smooth
//$fa=20*1; //rough

x = inner_width*1;
y = height*1;
r = sqrt((x*x)+(y*y));
cc = card_width*1;
a = asin(cc/r);
b = acos(x/r);
c = (a-b);
new_length = cc/sin(c);
additional = new_length-x;

wall_thickness2 = 2 * (1+(increase_wall/100));
wall_thickness = wall_thickness2-(2*rounded);
height2 = height-wall_thickness2;

minkowski()
{
difference()
{
	wedge( additional+new_length+2*wall_thickness, new_length+2*wall_thickness, (inner_thickness+rounded)+2*wall_thickness, height );

	wedge( additional+new_length, new_length, (inner_thickness+rounded), height );
}

diamond(rounded);
}

module wedge( length, length2, thickness, height )
{
	hull()
	{
		translate([(-length+length2)*0.5,0,height*0.5])
		cube( [length2, thickness, 0.1], true );

		translate([(length-length2)*0.5,0,-height*0.5])
		cube( [length2, thickness, 0.1], true );
	}
}

module bar( length, diam1, diam2, height )
{
	hull()
	{
		translate( [-length*0.5, 0, -height*0.5] )
		cylinder( height, diam1*0.5, diam2*0.5 );
		translate( [length*0.5, 0, -height*0.5] )
		cylinder( height, diam1*0.5, diam2*0.5 );
	}
}

module cutter(dist, overhang)
{
	size = dist*2;

	translate([dist,-dist,-dist])
	cube([size,size,size]);

	translate([-dist-size,-dist,-dist])
	cube([size,size,size]);

	translate([dist,-dist,0])
	rotate([0,-overhang,0])
	cube([size,size,size]);

	translate([-dist,-dist,0])
	rotate([0,-90+overhang,0])
	cube([size,size,size]);

	translate([dist,-dist,0])
	rotate([0,90+overhang,0])
	cube([size,size,size]);

	translate([-dist,-dist,0])
	rotate([0,180-overhang,0])
	cube([size,size,size]);

}

module diamond( rounded )
{
	dist = rounded;
	difference()
	{
		cube([2*rounded,2*rounded,2*rounded], true);
		for(i=[0:45:179])
		{
			rotate([0,0,i])
			cutter(dist, overhang);
		}
	}
}

```


[User]
Okay, I've got this idea for a little drawer that fits *inside* a toilet paper roll. It's kind of a silly idea, but I think it could be useful for storing small items.

I want to be able to customize the size, obviously, so it should be parametric. The key parameters I need are:

*   `inner_dia`: The inner diameter of the toilet paper roll (in mm).
*   `length`: The length of the toilet paper roll (also in mm).
*   `layer_th`: The thickness of the base layer (in mm). This is mostly for printing, since I'll want to be able to control the shell thickness, so if we're aiming for a single-layer shell, this'd be that value.
*   `side_th`: The thickness of the front and back of the drawer (in mm).

The design consists of three main parts:

1.  **The base**: This is the main body of the drawer, basically a rectangular platform that fits inside the roll. It should have a small lip around the edges for reinforcement.

2.  **The front**: This is the "face" of the drawer, designed to fit into the end of the roll. It needs a ridge that fits snugly against the inside of the roll, and a flat face. There should also be a small hollowed out area at the bottom of the face to help remove it from the build plate - maybe a thin cube that extends out a bit beyond the circular face.

3.  **The ribs**: There should be reinforcing ribs along the sides of the base to add strength, and also little "end ribs" at the front and back of the base to help keep the base centered.

I'd like to be able to render each part individually, or all of them together for a preview. So the file should have a variable like `part = "all"; // [base, side, all]` so I can toggle what is rendered.

For the front, I'd like to make sure that the opening is shaped so that when the front piece is inserted, the face will make contact at the top of the toilet paper roll before the bottom. To do that, I'd like the face to be slightly shorter along the bottom. I think I need to use an angled cut for that. I think I also need to add a bit of a lip on the front of the face too.

Finally, it would be great to use the `build_plate.scad` file from the utils library to show where it fits onto the build plate. So I'll need a variable like `build_plate_selector = 1; //[0:Replicator 2,1: Replicator,2:Thingomatic,3:Manual]` and two more variables if I set that selector to manual - `build_plate_manual_x` and `build_plate_manual_y`.

So, I need an OpenSCAD file with a parametric drawer design as described, with the `utils/build_plate.scad` library, and with an option to render parts separately or together. I'm not expecting any other libraries, just that. Can you help me out with this?

[Assistant]
toiletrolldrawer_v02.scad:
```
// Licence: Creative Commons, Attribution-NonCommercial
// Created: 12-09-2013 by bmcage http://www.thingiverse.com/bmcage

// A drawer to put in a toilet roll

//the different parts
part = "all";   // [base, side, all]

// roll settings

//toilet roll inner diameter in mm
inner_dia = 42;  //[20:80]
//toilet roll length in mm
length = 95;   //[30:200]
//layer thickness (so as to have shell of one layer thick!)
layer_th = 0.2;
//thickness of the front and back
side_th = 6;

use <utils/build_plate.scad>;

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

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

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

build_plate(build_plate_selector,build_plate_manual_x,build_plate_manual_y);

// we begin the building of the elements

if (part == "base"){
  drawer();
}
if (part == "side"){
  translate([-circumference/4,length/2+inner_dia/2 +5,0]) front();
}
if (part == "all"){
  drawer();
  translate([-circumference/4,length/2+inner_dia/2 +5,0]) front();
  translate([inner_dia,0,0]) translate([-circumference/4,length/2+inner_dia/2 +5,0]) front();
}

circumference = 4/3*PI * inner_dia / 2;
circumin = circumference - 6;
circumin_angle = circumin / inner_dia;

module drawer() {
  base();
  ribs();
  endribs();
}

//size reinforcement
reinf = 5;
module base(){
  translate([-circumference/2, -length/2,0]) {
    cube([circumference, length, layer_th]);
    //now reinforcement around it
    difference(){
      cube([circumference, length, 2*layer_th]);
      translate([reinf,reinf,-.5*layer_th]) cube([circumference-2*reinf, length-2*reinf, 3*layer_th]);
      }
    }
}

module rib(shift){
  //translate([-1+shift, -length/2+side_th,0]) cube([2, length-2*side_th, 1]);
  translate([-1+shift, -length/2,0]) cube([2, length, 1]);
}

nr_ribs = round((circumference-10)/4)+1;
module ribs(){
  for (i=[1:nr_ribs]) {
    rib(-circumference/2+5 +1 +(i-1)*4);
  }
}

module endrib(shift){
  translate([-shift, -length/2,0]) difference() {
	rotate([-90,0,0]) cylinder(r=1.5, h=length, $fn=50);
	translate([-2.5,-1,-10]) cube([5,length+2, 10]);
  }
}

module endribs(){
  endrib(-circumference/2+1.5);
  endrib(circumference/2-1.5);
}

module front(){
  difference(){
  union(){
  //outside ridge
  difference(){
    cylinder(r=inner_dia/2, h=side_th, $fn=50);
    translate([0,0,-0.5])cylinder(r=inner_dia/2-1.1, h=side_th+1, $fn=50);
    translate([inner_dia/2 - 3, -inner_dia/2, -1]) cube([inner_dia, inner_dia, side_th*4]);
 translate([-4* inner_dia+inner_dia/2*cos(circumin_angle*180/PI), -2*inner_dia, -inner_dia/2])cube([4*inner_dia, 4*inner_dia, inner_dia]);
//  rotate([0,0,90-circumin_angle*180/PI]) translate([-inner_dia, -inner_dia, -inner_dia/2])cube([inner_dia, inner_dia, inner_dia]);
//  mirror([0,-1,0]) rotate([0,0,90-circumin_angle*180/PI]) translate([-inner_dia, -inner_dia, -inner_dia/2])cube([inner_dia, inner_dia, inner_dia]);
  }

  //bottom visible part
  difference() {cylinder(r=inner_dia/2, h=1, $fn=50);
    translate([inner_dia/2 - 3, -inner_dia/2, -1]) cube([inner_dia, inner_dia, side_th*4]);
    translate([-4* inner_dia+inner_dia/2*cos(circumin_angle*180/PI), -2*inner_dia, -inner_dia/2])cube([4*inner_dia, 4*inner_dia, inner_dia]);
  }
  //inner piece
  difference() {cylinder(r=inner_dia/2-1-2, h=side_th, $fn=50);
    translate([-4* inner_dia+inner_dia/2*cos(circumin_angle*180/PI), -2*inner_dia, -inner_dia/2])cube([4*inner_dia, 4*inner_dia, inner_dia]);
  }
  }
  // a hollow part at bottom to allow easy removal from the build plate
  translate([-1.5*inner_dia, -1.5,-0.01]) cube([3*inner_dia, 3, 1]);
  }
}

```


[User]
Okay, I'm looking to design a customizable planetary gear bearing with a flange, and I've got some specific parameters I need to be able to control. I really like the idea of the herringbone gears for strength and smooth operation, and I want to make sure it's easy to adjust the number of planets, teeth, and the flange dimensions.

Here's what I need:

1.  **Overall Bearing Dimensions:** I need to set the outer diameter of the main ring (D), the total thickness of the ring (T), and the outer diameter of the flange (FD). The flange has its own thickness (FT) which needs to be customizable as well.

2.  **Gear Parameters:** This is the tricky part. I need to control:
    *   The number of planet gears (`number_of_planets`).
    *   The number of teeth on the planet gears (`number_of_teeth_on_planets`).
    *   An *approximate* number of teeth on the sun gear (`approximate_number_of_teeth_on_sun`). The actual number will need to be calculated based on the other numbers. I want it to have the proper ratio for the planets to mesh well with the ring gear.
    *   The pressure angle of the gear teeth (`P`).
    *   The number of teeth to twist across for the herringbone pattern (`nTwist`).
    *   A maximum depth ratio of the teeth (`DR`), controlling how deep they are.
    *   I'll also need a clearance value (`tol`) to control the gap between gears.

3.  **Center Hole:** The bearing needs a central hexagonal hole, so I'll need to be able to adjust the width of the hex (`w`).

4.  **Herringbone Gears:** The planet, sun, and ring gears should all be herringbone gears, to be constructed using a `herringbone()` module, and I'd like that module to itself rely on an underlying `gear()` module for individual gears, and a `gear2D()` module to help do the math for the 2D gear shape before extruding.

5. **Flange:** This needs to be a simple cylinder that extends from the main cylinder with the flange outer diameter and thickness as parameters

6. **Monogram:** I'd like a simple logo on the main ring for branding, so I'd like to include a `monogram()` module. This should be mirrored and recessed into the main body.

7. **Parametric Design:** This whole design needs to be parametric so I can tweak it easily for different projects, so I need to be able to change every one of the above parameters to adjust the design. This will need to generate all the gears and bearing in a single scad file.

8.  **Libraries:** I'm not using any outside libraries for this. I'd like all of the modules included in the same file, so please don't include any `use` statements.

I think that's everything. Let me know if anything's unclear!

[Assistant]
BearingWithFlange.scad:
```
// Planetary gear bearing with flange (customizable)

// outer diameter of ring
D=51.7;
// total thickness of ring (including flange)
T=20;
// outer diameter of flange
FD=56.7;
// thickness of flange
FT=5;
// clearance
tol=0.15;
number_of_planets=5;
number_of_teeth_on_planets=7;
approximate_number_of_teeth_on_sun=9;
// pressure angle
P=45;//[30:60]
// number of teeth to twist across
nTwist=1;
// width of hexagonal hole
w=6.7;

DR=0.5*1;// maximum depth ratio of teeth

m=round(number_of_planets);
np=round(number_of_teeth_on_planets);
ns1=approximate_number_of_teeth_on_sun;
k1=round(2/m*(ns1+np));
k= k1*m%2!=0 ? k1+1 : k1;
ns=k*m/2-np;
echo(ns);
nr=ns+2*np;
pitchD=0.9*D/(1+min(PI/(2*nr*tan(P)),PI*DR/nr));
pitch=pitchD*PI/nr;
echo(pitch);
helix_angle=atan(2*nTwist*pitch/T);
echo(helix_angle);

phi=$t*360/m;

translate([0,0,T/2]){
	difference(){
		union() {
      	// main body of ring
			cylinder(r=D/2,h=T,center=true,$fn=100);

	 	   // lip at top of ring
      	translate([0,0,-T/2+FT/2]) {
       		cylinder(r=FD/2,h=FT,center=true,$fn=100);
        	}
    	}
		herringbone(nr,pitch,P,DR,-tol,helix_angle,T+0.2);
		difference(){
			translate([0,-D/2,0])rotate([90,0,0])monogram(h=10);
			cylinder(r=D/2-0.25,h=T+2,center=true,$fn=100);
		}
	}
	rotate([0,0,(np+1)*180/ns+phi*(ns+np)*2/ns])
	difference(){
		mirror([0,1,0])
			herringbone(ns,pitch,P,DR,tol,helix_angle,T);
		cylinder(r=w/sqrt(3),h=T+1,center=true,$fn=6);
	}
	for(i=[1:m])rotate([0,0,i*360/m+phi])translate([pitchD/2*(ns+np)/nr,0,0])
		rotate([0,0,i*ns/m*360/np-phi*(ns+np)/np-phi])
			herringbone(np,pitch,P,DR,tol,helix_angle,T);
}

module rack(
	number_of_teeth=15,
	circular_pitch=10,
	pressure_angle=28,
	helix_angle=0,
	clearance=0,
	gear_thickness=5,
	flat=false){
addendum=circular_pitch/(4*tan(pressure_angle));

flat_extrude(h=gear_thickness,flat=flat)translate([0,-clearance*cos(pressure_angle)/2])
	union(){
		translate([0,-0.5-addendum])square([number_of_teeth*circular_pitch,1],center=true);
		for(i=[1:number_of_teeth])
			translate([circular_pitch*(i-number_of_teeth/2-0.5),0])
			polygon(points=[[-circular_pitch/2,-addendum],[circular_pitch/2,-addendum],[0,addendum]]);
	}
}

module monogram(h=1)
linear_extrude(height=h,center=true)
translate(-[8,2.5])union(){
	difference(){
		square([4,5]);
		translate([1,1])square([2,3]);
	}
	square([6,1]);
	translate([0,2])square([2,1]);
   translate([6,2])square([3,1]);
   translate([7,1])square([1,3]);
   translate([9,4])square([3,1]);
   translate([10,0])square([1,4]);
	translate([12,0])square([1,5]);
   translate([13,2])square([1,1]);
	translate([14,0])square([1,5]);
   translate([15,2])square([1,1]);
	translate([16,0])square([1,5]);
}

module herringbone(
	number_of_teeth=15,
	circular_pitch=10,
	pressure_angle=28,
	depth_ratio=1,
	clearance=0,
	helix_angle=0,
	gear_thickness=5){
union(){
	gear(number_of_teeth,
		circular_pitch,
		pressure_angle,
		depth_ratio,
		clearance,
		helix_angle,
		gear_thickness/2);
	mirror([0,0,1])
		gear(number_of_teeth,
			circular_pitch,
			pressure_angle,
			depth_ratio,
			clearance,
			helix_angle,
			gear_thickness/2);
}}

module gear (
	number_of_teeth=15,
	circular_pitch=10,
	pressure_angle=28,
	depth_ratio=1,
	clearance=0,
	helix_angle=0,
	gear_thickness=5,
	flat=false){
pitch_radius = number_of_teeth*circular_pitch/(2*PI);
twist=tan(helix_angle)*gear_thickness/pitch_radius*180/PI;

flat_extrude(h=gear_thickness,twist=twist,flat=flat)
	gear2D (
		number_of_teeth,
		circular_pitch,
		pressure_angle,
		depth_ratio,
		clearance);
}

module flat_extrude(h,twist,flat){
	if(flat==false)
		linear_extrude(height=h,twist=twist,slices=twist/6)child(0);
	else
		child(0);
}

module gear2D (
	number_of_teeth,
	circular_pitch,
	pressure_angle,
	depth_ratio,
	clearance){
pitch_radius = number_of_teeth*circular_pitch/(2*PI);
base_radius = pitch_radius*cos(pressure_angle);
depth=circular_pitch/(2*tan(pressure_angle));
outer_radius = clearance<0 ? pitch_radius+depth/2-clearance : pitch_radius+depth/2;
root_radius1 = pitch_radius-depth/2-clearance/2;
root_radius = (clearance<0 && root_radius1<base_radius) ? base_radius : root_radius1;
backlash_angle = clearance/(pitch_radius*cos(pressure_angle)) * 180 / PI;
half_thick_angle = 90/number_of_teeth - backlash_angle/2;
pitch_point = involute (base_radius, involute_intersect_angle (base_radius, pitch_radius));
pitch_angle = atan2 (pitch_point[1], pitch_point[0]);
min_radius = max (base_radius,root_radius);

intersection(){
	rotate(90/number_of_teeth)
		circle($fn=number_of_teeth*3,r=pitch_radius+depth_ratio*circular_pitch/2-clearance/2);
	union(){
		rotate(90/number_of_teeth)
			circle($fn=number_of_teeth*2,r=max(root_radius,pitch_radius-depth_ratio*circular_pitch/2-clearance/2));
		for (i = [1:number_of_teeth])rotate(i*360/number_of_teeth){
			halftooth (
				pitch_angle,
				base_radius,
				min_radius,
				outer_radius,
				half_thick_angle);
			mirror([0,1])halftooth (
				pitch_angle,
				base_radius,
				min_radius,
				outer_radius,
				half_thick_angle);
		}
	}
}}

module halftooth (
	pitch_angle,
	base_radius,
	min_radius,
	outer_radius,
	half_thick_angle){
index=[0,1,2,3,4,5];
start_angle = max(involute_intersect_angle (base_radius, min_radius)-5,0);
stop_angle = involute_intersect_angle (base_radius, outer_radius);
angle=index*(stop_angle-start_angle)/index[len(index)-1];
p=[[0,0],
	involute(base_radius,angle[0]+start_angle),
	involute(base_radius,angle[1]+start_angle),
	involute(base_radius,angle[2]+start_angle),
	involute(base_radius,angle[3]+start_angle),
	involute(base_radius,angle[4]+start_angle),
	involute(base_radius,angle[5]+start_angle)];

difference(){
	rotate(-pitch_angle-half_thick_angle)polygon(points=p);
	square(2*outer_radius);
}}

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

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

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

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

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

```


[User]
Okay, I'm looking to generate a customizable handle for hex wrenches, similar to the one I found on Thingiverse (http://www.thingiverse.com/thing:129760) but parametric so I can adjust it for different wrench sizes.

Essentially, I need a cylindrical handle with a hole through the center for the wrench shaft, plus a slot to accommodate the bent part of the wrench, and some slots for zip ties to secure the wrench to the handle. I also want the handle to have a bit of a rounded cap at the top and some knurling for grip.

Here are the specific parameters I need to control:

*   **hex_size:** The diameter of the hex wrench itself (e.g. 2.5, 3, 4mm etc.). This will determine the size of the hole and the slot.
*   **hole_delta:** An allowance to make the hole slightly bigger than the hex size so the wrench can insert easily.
*   **handle_diameter:** The diameter of the main handle cylinder.
*   **handle_height:** The overall height of the handle.
*   **slot_bottom:** The Z-height (from the base of the cylinder) of the bottom of the main wrench slot.
*   **zip_tie_back**: the horizontal position (X-axis) of the zip tie slot.
*   **slot_width**: the width of the zip tie slots.

Here's a breakdown of the features I need:

1.  **Main Cylinder:** A cylinder for the handle, with a rounded cap at the top. The base will be flat.
2.  **Knurling:** Indented cylinders (like pegs) around the main handle's surface for grip.
3.  **Shaft Hole:** A cylindrical hole going all the way through the handle for the shaft of the wrench.
4.  **Wrench Slot:** A rectangular slot starting at `slot_bottom` going up the side, sized to accommodate the hex wrench. It will have its center aligned with the Y axis.
5.  **Wrench Bend Slot:** A shorter rectangular slot below the main wrench slot to make room for the bend in the wrench.
6.  **Zip Tie Slots:** Two small slots on the side to allow a zip tie to secure the wrench, one below the main slot and one closer to the wrench head.
7. **Zip Tie Openings**: Cut-outs through the side of the main cylinder connecting both zip tie slots.

I would like this design to be generated in OpenSCAD, as I'm familiar with that. I don't need any external libraries for this, just the basic OpenSCAD primitives. Could you please generate the OpenSCAD file for me?

[Assistant]
Hex_Wrench_Handle.scad:
```
// Diameter of hole for the hex wrench
hex_size = 2.8;

// Increase slot size by this amount
hole_delta = 0.15;

// Diameter of the handle
handle_diameter = 25;

handle(hex_size);

module handle(hex_size)
{
	hex_radius = (hex_size + hole_delta) / 2;
	hex_size = hex_size + hole_delta;
	handle_radius = handle_diameter / 2;
	knurl_offset = handle_radius * 1.2;
	handle_height = 50;
	slot_width = 1.2 * handle_radius;
	zip_tie_back = 0.6 * handle_radius;
	slot_bottom = 15;

	$fn=40;									// Control quality of mesh

	hole_radius = hex_radius + .2;	// Give a little more room for small hole

	difference()
	{
		union()
		{
			cylinder(h = 5, r1 = handle_radius - 3, r2 = handle_radius);
			translate(v=[0, 0, 5])
				cylinder(h = handle_height - 5, r = handle_radius);
			translate(v=[0, 0, handle_height])
				sphere(handle_radius);
		}

		for (angle = [30:60:360])
			translate(v=[knurl_offset * cos(angle), knurl_offset * sin(angle), 0])
				cylinder(h = handle_height + handle_radius, r = handle_radius / 2.7);

		// Shaft hole
		cylinder(h = handle_height + handle_radius, r = hole_radius);

		// Small cone at bottom
		cylinder(h = 2, r1 = hole_radius + .6, r2 = hole_radius);

		// Slot for the wrench
		translate(v=[0, -hex_size / 2, slot_bottom])
			cube(size = [handle_radius, hex_size, handle_height + handle_radius]);

		// Slot for bend in wrench
		translate(v=[0, -hex_size / 2, slot_bottom - 1.5 * hex_size])
			cube(size = [1.5 * hex_size, hex_size, 2 * hex_size]);

		// Lower slot for zip-tie
		translate(v=[zip_tie_back, -slot_width / 2, slot_bottom - 6])
			cube(size=[3, slot_width, 3]);

		// Upper slot for zip tie
		translate(v=[zip_tie_back, -slot_width / 2, slot_bottom + sin(60) * hex_size - 1])
			cube(size=[3, slot_width, 3]);

		// Zip Tie Opening
		translate(v=[zip_tie_back, slot_width / 4, slot_bottom - 6])
			cube(size=[3, slot_width / 4, 6 + sin(60) * hex_size + 2]);

		translate(v=[zip_tie_back, -slot_width / 2, slot_bottom - 6])
			cube(size=[3, slot_width / 4, 6 + sin(60) * hex_size + 2]);
	}
}

```


[User]
Okay, I'm looking to design a custom stamp, like a personalized embosser. I have a pretty good idea of how it should work, but I need help generating the OpenSCAD code.

Here's what I want:

The stamp will consist of two main parts: a top piece that has the embossed image and the male hinge parts, and a bottom piece that has the female hinge parts and a mirrored version of the handle. The two pieces will connect with a hinge, allowing them to rotate against each other. This way you can compress the handle together and have the emboss surface contact a surface.

**Image Embossing:**
I want to load a 150x150 pixel image and use it to create the embossed surface. Simple, high contrast images work best, and I know I'll need to invert the colors within the OpenSCAD file as necessary. The image will be stretched to fit a rectangular plate of a given size.

**Hinge:**
The hinge will be a basic pin-and-socket style. I need to be able to choose which side of the image the hinge is placed on: top, left, bottom, or right. The male hinge parts will be on the top piece, and the female parts will be on the bottom piece.

**Handle:**
The handle will be a rectangular bar that extends from the embossing plate. It needs to be a comfortable length and thickness. It should have rounded edges, and I would like a guide cutout to help with aligning the top and bottom before hinging. The handles should mirror each other, so when connected, the stamp is symmetrical.

**Parameters:**
I would like the following parameters to be customizable:

*   `image_file`: The file path to the image used for the emboss (image_surface with 150x150 pixels).
*   `hinge_placement`: A numerical value (1 to 4) to select the hinge position (1=top, 2=left, 3=bottom, 4=right).
*   `emboss_height`: The height (in mm) of the raised embossed area of the plate.
*   `handle_thickness`: The thickness (in mm) of the handle.
*   `handle_length`: The length (in mm) of the handle. It should not be less than 45 mm.

**Hidden parameters:**
These will be used to help create the objects. Don't let them be set by the user.
* `$fa`: Angular Resolution
* `$fs`: Linear Resolution
* `image_width`: Width of image plate
* `image_length`: Length of image plate
* `image_padding`: Spacing between edge of image plate and outside edge of handle
* `handle_width`: Width of handle
* `handle_height`: Height of handle
* `nub`: Size of the hinge
* `tol`: Spacing between hinge parts

**Libraries:**
I don't need any special libraries, just what is provided in the OpenSCAD core.

Could you generate the OpenSCAD file based on these requirements?

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

/* [Global] */

// Load a 150x150 pixel image.(images will be stretched to fit) Simple, high contrast images work best. Make sure to click the Invert Colors checkbox!
image_file = "smile.dat"; // [image_surface:150x150]

// Where would you like the hinge in relation to your image?
hinge_placement = 1; // [1:top,2:left,3:bottom,4:right]

// What height would you like for the embossed area (mm)?
emboss_height = 1.5;

// How thick should the handle be (mm)?
handle_thickness = 2.5;

// How long should the handle be (mm, not less than 45)?
handle_length = 70;

/* [Hidden] */
$fa = 6;
$fs = 1.5;
image_width = 40;
image_length = 40;
image_padding = 4;

handle_width = image_width + image_padding*2;
handle_height = emboss_height+handle_thickness;
nub = 3; // hinge size
tol = 0.5; // spacing between hinge pieces

assembly();

module assembly() {
    stamp_top(90*hinge_placement);
    stamp_bottom(90*hinge_placement);
}

module stamp_top(rot=90) {
    translate([1,0,0])
    union() {
        difference () {
            translate([handle_length + nub + tol, -handle_width/2, 0])
                rotate([0,0,90]) handle();
            translate([handle_length-image_length/2+nub+tol,0,handle_height])
                rotate([0,180,rot]) plate();
        }

        // hinge
        translate([-1,handle_width/2-2*nub,handle_height]) hinge_m();
        mirror([0,1,0]) translate([-1,handle_width/2-2*nub,handle_height]) hinge_m();
        translate([-1,-nub,handle_height]) hinge_m();
        mirror([0,1,0]) translate([-1,-nub,handle_height]) hinge_m();
    }
}

module stamp_bottom(rot=90) {
    translate([-1,0,0])
    union() {
        translate([-handle_length + image_length/2-nub-tol,0,handle_height])
            rotate([0,0,-rot]) plate();
        mirror([1,0,0]) translate([handle_length + nub + tol, -handle_width/2, 0])
            rotate([0,0,90]) handle();

        // hinge
        translate([1,-nub-tol,handle_height]) hinge_f();
        mirror([0,1,0]) translate([1,-nub-tol,handle_height]) hinge_f();
    }
}

module handle() {
    difference() {
        hull() {
            cube([handle_width, handle_length, handle_height]);
            translate([image_padding,0,0]) cylinder(r=image_padding, h=handle_height);
            translate([handle_width-image_padding,0,0]) cylinder(r=image_padding, h=handle_height);
        }
        guide();
    }

}

module guide() {
    translate([image_padding,0,-.5])
    difference() {
        cube([image_width, image_length, 1]);
        translate([1,1,-0.5]) cube([image_width-2, image_length-2, 2]);
    }
}

module hinge_m() {
    difference () {
    	rotate([0,45,0]) union(){
            translate([0,0,-nub]) cube ([nub*3,nub*2, nub*2]);
            rotate([90,0,0]) {
                translate([0,0,-2*nub]) cylinder(r=nub,h=2*nub);
    		    cylinder(r1=nub,r2=0,h=nub);
            }
    	}
        translate([-nub,-nub/2,-handle_height-nub*5]) cube([nub*5, nub*3, nub*5]);
    }
}

module hinge_f() {
    len = handle_width/2 - 3*nub - 2*tol;

    difference() {
        rotate([90,-45,0])
        difference() {
            union() {
                cylinder(r=nub, h=len);
                translate([-3*nub,-nub,0]) cube([nub*3,nub*2,len]);
            }
            translate([0,0,-0.1]) cylinder(r1=nub+tol,r2=0,h=nub);
            translate([0,0,len-nub+0.1]) cylinder(r1=0,r2=nub+tol,h=nub);
        }
        translate([-nub*4,-len-nub/2,-handle_height-nub*5]) cube([nub*5, len+nub, nub*5]);
    }
}

module plate() {
    scale([(image_width)/150,(image_length)/150,emboss_height])
        surface(file=image_file, center=true, convexity=5);
}

```


[User]
Okay, I need a new OpenSCAD file to create a shelf talker, but this time I need a version that mirrors the existing design, so that I can have shelf talkers facing both directions on a shelf.

The current design, `shelf_talker_left.scad`, has the bracket on the left side of the text. I need a new file, `shelf_talker_right.scad` where the bracket is on the *right* side of the text.

Here are the design considerations I need for the new file:

1.  **Text:** The new file should be fully parametric to match the existing file, allowing users to input the `label_text`, `font_size`, `letter_spacing`, and `font`. I need these variables to behave exactly as they do in `shelf_talker_left.scad`.
2.  **Shelf Thickness:** I need a parameter for the `shelf_thickness`, also matching `shelf_talker_left.scad`.
3.  **Mirroring:** The key difference will be that the bracket geometry is mirrored to the *right* side of the text rather than the left. Essentially, all the bracket-related translation values should be adjusted to achieve this. It also should not have `rotate([0,180,0])` around the bracket.
4.  **Dimensions:** The dimensions of the shelf talker (other than the position of the bracket) should remain the same as in `shelf_talker_left.scad`, ensuring that the overall size of the text area remains unchanged. All dimensions should be calculated based off of the text input width as before.
5.  **Libraries:** The existing file uses `write/Write.scad` for the text and `utils/build_plate.scad`. I need the new file to use these libraries as well. I do not want any other libraries included.
6.  **Preview:** The preview should still be visible when viewed from `south` with `tilt:top` as in `shelf_talker_left.scad`.
7.  **Starting Point:** Here is the `shelf_talker_left.scad` code to base this new design off of:
```
//Modified to put the bracket on the left of the lettering
// RLazure Sept 18, 2013

// Customizable Shelf Talker v1.0
// by TheNewHobbyist 2013 (http://thenewhobbyist.com)
// http://www.thingiverse.com/thing:78727
//
// Explanation here
//
// Change Log:
//
// v1.0
// Initial Release
//

/////////////////////////
//  Customizer Stuff  //
///////////////////////

/* [Fit_and_Finish] */

// What would you like to label?
label_text = "fiction";

// How big?
font_size = 20; //[10:40]

// Want to space out that text?
letter_spacing = 1; // // [0.9:Tight,1:Default,1.5:Wide]

// Make it pretty
font = "write/Letters.dxf"; // ["write/BlackRose.dxf":Black Rose,"write/knewave.dxf":Knewave,"write/Letters.dxf":Letters,"write/orbitron.dxf":Orbitron]

// Shelf thickness in mm
shelf_thickness = 20;

//For display only, not part of final model
build_plate_selector = 0; //[0:Replicator 2/2X,1: Replicator,2:Thingomatic,3:Manual]

// "Manual" build plate X dimension
build_plate_manual_x = 100; //[100:400]

// "Manual" build plate Y dimension
build_plate_manual_y = 100; //[100:400]

build_plate(build_plate_selector,build_plate_manual_x,build_plate_manual_y);

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

/////////////////////////
// Beat it Customizer //
///////////////////////

/* [Hidden] */

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

width = (.6875*font_size*letter_spacing); // Find width of each character
totalwidth = width * (len(label_text) - 1); // Find total width of text

/////////////////////////
// Build Shelf Talker //
///////////////////////

module full_talker() {
	union() {
		translate([-3,0,0]) write(label_text,h=font_size,t=3,font=font, space=letter_spacing);
		translate([0,-1.5,0]) cube([totalwidth+15, 3, 3]);
		rotate([0,180,0]) translate([-20,shelf_thickness * -1 - 3,-20]) cube([2, shelf_thickness + 3, 20]);
		rotate([0,180,0]) translate([-20,shelf_thickness * -1 - 3,-20]) rotate([0,0,5]) cube([25, 2, 20]);
		rotate([0,180,0]) translate([-20,-1.5,-20]) cube([20, 3, 20]);
		}
}

//totalwidth - 5
//////////////////////////////
// Center part on platform //
////////////////////////////

translate([totalwidth / -2,font_size + shelf_thickness / -2,0]) full_talker();

```
I'm looking forward to seeing what you come up with!

[Assistant]
shelf_talker_left.scad:
```
//Modified to put the bracket on the left of the lettering
// RLazure Sept 18, 2013

// Customizable Shelf Talker v1.0
// by TheNewHobbyist 2013 (http://thenewhobbyist.com)
// http://www.thingiverse.com/thing:78727
//
// Explanation here
//
// Change Log:
//
// v1.0
// Initial Release
//

/////////////////////////
//  Customizer Stuff  //
///////////////////////

/* [Fit_and_Finish] */

// What would you like to label?
label_text = "fiction";

// How big?
font_size = 20; //[10:40]

// Want to space out that text?
letter_spacing = 1; // // [0.9:Tight,1:Default,1.5:Wide]

// Make it pretty
font = "write/Letters.dxf"; // ["write/BlackRose.dxf":Black Rose,"write/knewave.dxf":Knewave,"write/Letters.dxf":Letters,"write/orbitron.dxf":Orbitron]

// Shelf thickness in mm
shelf_thickness = 20;

//For display only, not part of final model
build_plate_selector = 0; //[0:Replicator 2/2X,1: Replicator,2:Thingomatic,3:Manual]

// "Manual" build plate X dimension
build_plate_manual_x = 100; //[100:400]

// "Manual" build plate Y dimension
build_plate_manual_y = 100; //[100:400]

build_plate(build_plate_selector,build_plate_manual_x,build_plate_manual_y);

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

/////////////////////////
// Beat it Customizer //
///////////////////////

/* [Hidden] */

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

width = (.6875*font_size*letter_spacing); // Find width of each character
totalwidth = width * (len(label_text) - 1); // Find total width of text

/////////////////////////
// Build Shelf Talker //
///////////////////////

module full_talker() {
	union() {
		translate([-3,0,0]) write(label_text,h=font_size,t=3,font=font, space=letter_spacing);
		translate([0,-1.5,0]) cube([totalwidth+15, 3, 3]);
		rotate([0,180,0]) translate([-20,shelf_thickness * -1 - 3,-20]) cube([2, shelf_thickness + 3, 20]);
		rotate([0,180,0]) translate([-20,shelf_thickness * -1 - 3,-20]) rotate([0,0,5]) cube([25, 2, 20]);
		rotate([0,180,0]) translate([-20,-1.5,-20]) cube([20, 3, 20]);
		}
}

//totalwidth - 5
//////////////////////////////
// Center part on platform //
////////////////////////////

translate([totalwidth / -2,font_size + shelf_thickness / -2,0]) full_talker();

```


[User]
Okay, I'm trying to dial in the perfect fit for screw holes in my 3D prints, and I've been using a script I found online (attached). It's pretty good, but I'd like something a little more flexible and, ideally, cleaner in terms of the code.

Here's the gist of what the attached script does:

It creates a test block with a hole and a counterbore/countersink for a screw. It lets me adjust several key parameters:

*   **`head`**: The diameter across the flats of a hex head screw or the diameter of a round head screw.
*   **`type`**: This is used to control the polygon count for the countersink, so either a hex head (e.g., 6 sides) or a round head (high number of sides for a cylinder).
*   **`size`**: The diameter of the screw's shaft.
*   **`smoothness`**: Polygon count for the main screw hole cylinder.
*   **`length`**: The length of the screw shaft (not the head).
*  **`cap`**: The height of the screw head/cap.
*   **`border`**: The thickness of the block around the screw feature.
*   **`layer`**: Print layer thickness (used mainly for head-down orientation).
*   **`view_part`**: An integer that selects the view position for the block.

The script creates a solid block with a hole the size of the screw shaft, and then a counterbore/countersink at the top for the screw head.  It also adds a small red section, which I think is meant to be a tolerance check, but I'm not sure of the exact method. The script also supports printing with the head up, head down or horizontally.

What I'd like is a similar parametric OpenSCAD script, but with some enhancements:

1.  **More explicit clearance controls**: Instead of just relying on `size` for the hole, I would like separate `screw_hole_diameter` and `screw_hole_clearance` parameters. This will let me adjust the hole size independently of the screw diameter. The counterbore/countersink needs its own clearance parameter too. It would be helpful if it could be defined as a 'fit' value, e.g., 'tight', 'medium', 'loose', that corresponds to a calculation relative to the size. Perhaps this could be an integer.

2.  **Options for countersunk and counterbored holes**: The current script is OK for a round cap head or a regular hex bolt, but I would also like a true conical countersunk option. I need both a counterbored and countersunk option.

3.  **More flexible head shapes**: In addition to the hex and round head options, I'd like the ability to also easily create a square socket for captive nuts.

4.  **Improved preview control:** The "head-down" view is confusing; can you make the previews just the part oriented in the desired position without a repositioning of the part? It doesn't seem useful, and if it's meant for printing I would orient it before exporting.

5.  **Automatic hole taper:** I would like the option for automatic, variable taper on the opening of the hole for ease of screw insertion. The amount of this taper would be defined as a diameter on the top and another on the bottom.

6.  **Bolt library:** If it's possible, I would like to use the BOLTS library for the screw heads so I have a more accurate representation of standard sizes.

7. **Nomenclature:** In my opinion, the terms `head` and `cap` are too vague; please change these to `head_diameter` and `head_height` respectively.

Can you design an OpenSCAD script that does all this? It should be well commented and easy to use for someone relatively new to OpenSCAD.

[Assistant]
3d_print_screw_hole_test.scad:
```
// File: 3d_print_screw_hole_test.scad
// Author: Mark Heywood alias Airtripper
// Airtripper Extruder Filament Force Sensor Bracket
// by Airtripper May 2013
// Copyright © 2013 Airtripper
// http://www.airtripper.com
// Licensed Attribution-NonCommercial-ShareAlike 3.0 Unported.
// Last edit: 26/09/2013

/* [Global] */

//  - Select part to view/print from list
view_part = 1;	// [0:design, 1:head_up, 2:head_down, 3:horizontal]

//  - Screw head diameter - flat side to flat side on hex nut or bolt head
head = 6.75;
//  - Screw head type - [6] for hex head and [50] or more for round head
type = 6;
//  - Screw size diameter
size = 3.65;
//  - Screw size diameter smoothness
smoothness = 50;
//  - Screw size length - not including screw head
length = 5;
//  - Screw head length
cap = 3;
//  - Block border thickness between screw head and block edge
border = 4;
//  - Print layer thickness - only required for head down print
layer = 0.25;

/* hidden */

//++++++++++++++++++++ Model View, Positioning and Rotation ++++++++++++++++++++

if (view_part == 0) {	// Original design view & position
	translate([0,0,0]) rotate([0,0,0]) screw_block();
}
if (view_part == 1) {	// Centred head up position
	translate([-((border*2)+head)/2,-((border*2)+head)/2,0]) rotate([0,0,0]) screw_block();
}
if (view_part == 2) {	// Centred head down position
	translate([((border*2)+head)/2,-((border*2)+head)/2,length+cap]) rotate([0,-180,0]) screw_block();
}
if (view_part == 3) {	// Centred horizontal position
	translate([-((border*2)+head)/2,(length+cap)/2,0]) rotate([90,0,0]) screw_block();
}

//++++++++++++++++++++ Script Subroutines ++++++++++++++++++++

//######################### Screw Block ##########################

// screw_block();

module screw_block() {
	difference() {
		translate([0,0,0]) cube([head+(border*2),head+(border*2),length+cap]);	// block
		translate([border+(head/2),border+(head/2),-1-layer]) cylinder(length+1, r=size/2, $fn=smoothness);	// screw size
		translate([border+(head/2),border+(head/2),length]) cylinder(cap+1, r=head/2, $fn=type);	// screw head/cap
		translate([border+(head/2),border+(head/2),-1]) color("red") cylinder(1.5, r1=(size/2)+2, r2=size/2, $fn=smoothness);	// screw size taper
		translate([border+(head/2),border+(head/2),length+cap-0.5]) color("red") cylinder(2, r1=head/2, r2=(head/2)+2, $fn=type);	// screw head/cap taper
	}

}

// end
```


[User]
Okay, I'm trying to design a jig for twisting wires, and I'd like to make it parametric so I can easily adjust it for different wire gauges and numbers of strands. I have a basic design in mind, but it needs some cleanup and flexibility.

Essentially, it's a cylinder with channels cut into the surface spiraling up the cylinder, intended to guide the wires as they are twisted.  Here's a breakdown of what I need:

**Core Parameters:**

*   **`jigRad`**: The radius of the main cylindrical body of the jig.
*   **`jigHeight`**: The height of the jig.
*   **`wireRad`**: The radius of a single wire.
*   **`numStrand`**: The number of wire channels/strands (ideally should be able to support up to 20)
*   **`center`**: A boolean option (0 or 1) to include a center channel, this is for if I want one single wire in the center, or just want the twisted wires only.

**Design Requirements:**

*   **Main Body:** The jig should be a simple cylinder defined by `jigRad` and `jigHeight`.
*   **Wire Channels:**
    *   The wire channels should be created by subtracting smaller cylinders from the main cylinder.
    *   Each channel should spiral along the length of the cylinder. I believe the angle to rotate along the z axis should be based on a tangent between the radius of the jig and the height, so that all the wires end at the top of the jig.
    *   The wire channels should be positioned evenly around the circumference of the main cylinder.
    *   The radius of the channels should be defined by `wireRad`
    *   The channels should be angled towards the center, as if the wire would be wrapped up the cylinder.
    *   The starting point of the channel, and the translation from the center should be calculated automatically based on if the `center` paramater is 1 or 0.
*   **Center Channel (Optional):**
    *   If `center` is 1, there should be a straight cylindrical hole in the very center of the jig with a radius of `wireRad`.
*   **Smoothness:** I want to be able to control the smoothness of the final model, the current code uses `$fn=50` for this. I would like this to be a parameter (`smoothness`).

**Desired Improvements/Considerations:**

*   **Correct Wire Channel Rotation:** I'm not entirely sure if my channel rotation is correct. It needs to ensure the wires end at the top of the cylinder.
*   **Parameter Validation:**  It would be great to have some basic parameter validation or clamping, especially for the number of strands.  I don't want to break the script by setting `numStrand` to a negative number, for example.
*   **Modularity:** It might be helpful if the wire channel creation logic was more modular, in case I want to re-use or adjust the channel geometry in the future.

**Desired Output:**

A single .scad file that I can open and customize in OpenSCAD with the parameters mentioned above. I am not asking for any external libraries to be included in the code other than the built-in OpenSCAD libraries.

Can you generate an OpenSCAD script for this jig that meets these specifications?

[Assistant]
WireJig.scad:
```
// preview[view:north, tilt:top]

center = 0; //[0:No Center, 1:Center]
wireRad = 1;
jigRad = 7.5;
jigHeight=30;
numStrand = 3; //[3:20]
// Smoothness of the stl
$fn=50;

difference()
{
	cylinder(h=jigHeight, r=jigRad);

	union()
	{
		for (i=[1:1:numStrand])
		{
			if (center)
			{
				rotate([-atan((jigRad-(wireRad/(sin(180/numStrand))+wireRad*(1-cos(180/numStrand))))/jigHeight),0,i*360/numStrand])
				translate([0,wireRad/(sin(180/numStrand))+wireRad*(1-cos(180/numStrand)),0])
				cylinder(h=jigHeight*4, r=wireRad, center=false);
			}
			else
			{
				rotate([-atan((jigRad-(wireRad/(cos(180/numStrand))))/jigHeight),0,i*360/numStrand])
				translate([0,wireRad/(sin(180/numStrand)),0])
				cylinder(h=jigHeight*4, r=wireRad, center=false);
			}
		}
		if (center)
		{
			cylinder(h=jigHeight*4, r=wireRad, center=true);
		}
	}
}
```


[User]
Okay, I'd like to design a simple vase that's twisted, and I want it to be parametric so I can adjust the dimensions.

Essentially, I want a hexagonal vase that gets twisted as it goes up. The design should start with a base hexagon and then twist as it extrudes vertically. The walls of the vase should be consistent, so I need to extrude the outer shape and then subtract an inner shape from it.

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

*   **`radius`**: This will be the radius of the hexagon used for the base. I'd like it to be settable between 5 and 100 units.
*   **`wall`**: This will define the thickness of the vase walls. I want to control this between 1 and 10 units.
*   **`height`**: This will control the total height of the vase. This should be adjustable between 50 and 150 units.
*   **`twist`**: This parameter will control the amount of twist applied to the vase as it extrudes upwards. This should range from 0 to 180 degrees.

The vase should be hollow, and the base should have a solid bottom – so the inner subtraction should start just above the bottom to keep the base intact. I was thinking that I would use linear extrude with twist, but with `$fn=6` on the initial shapes and slicing to smooth the twist.
Could you provide me with an OpenSCAD file that creates this vase, and uses these parameters so I can adjust it easily? I'd prefer to not rely on any external libraries for this, just vanilla OpenSCAD if possible.

[Assistant]
Twisted_Vase_TH.scad:
```
radius = 25;//[5:100]
wall = 2;//[1:10]
height = 130;//[50:150]
twist = 60;//[0:180]

difference(){
linear_extrude(height = height, center = false, convexity = 0, twist = twist, slices=height/20)
circle(r = radius, $fn=6);
translate([0,0,wall])
linear_extrude(height=height-wall+1, center=false, convexity=0, twist=twist, slices=height/20)
circle(r = radius-wall, $fn=6);
}
```


[User]
Okay, I'd like to design a can handle that clips onto a standard beverage can. I want it to be customizable with text, and I need some parameters for the can size itself. I'm envisioning a sort of "C" shaped handle that wraps around the can, with clips at the top and bottom to hold it in place.

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

**General Shape:**

*   A "C" shaped handle that wraps around a standard beverage can.
*   The handle should have a comfortable grip area.

**Customization:**

*   **Text Input:**  I need to be able to specify text that's printed on the handle, ideally in a circle.
*   **Text Boldness:** I'd like an option to make the text bolder, so it's easier to see for those with less detailed printers.
*   **Raised/Inset Text:** I also want to choose if the text is raised from the surface or inset into it.

**Can Dimensions (Parameters):**

*   **Can Diameter:** I need a parameter to specify the can diameter. Let's call it `cand`.
*   **Can Height:** I need a parameter for the height of the can. Let's call it `canh`.
*   I’m assuming we’ll design for standard cans, but having parameters is crucial for adjustments

**Handle Dimensions:**

*   **Handle Thickness:**  A parameter for the overall thickness of the handle, let’s call that `thick`.

**Clips:**

*   The design should have a top clip and a bottom clip to securely grip the can.
*   The clips should be designed to avoid concentrating stress when bent, maybe with rounded corners
*   The top and bottom clips should be slightly different in design.

**OpenSCAD Libraries:**

*  I know I’ll need to use the `Write.scad` library for the text functionality
*   I'm open to other libraries if they are useful, but lets start with `Write.scad`.

**Additional considerations:**
* I would like some simple cube and cylinder subtractive operations to cut out the clip sections and the main grip area from a main block.
* The handle should be designed so that the can will still stand on its own when it's set down, even if it wobbles a bit.

I think that covers it. I'd like the resulting OpenSCAD file to be fully parametric, so I can easily change the dimensions and text.

[Assistant]
Can_Handle_V6.scad:
```
use <write/Write.scad>;
// preview[view:south, tilt:top]

// What to Print on Handle
text = "Your Text Here";
// Make the text wider so it is clearer?
bold = "No"; // [Yes,No]
// Height of Can (125 should work for most of North America)
canh = 125;
// Raised Text?
raise="No"; // [Yes,No]

/* [Hidden] */
// Diameter of Can
cand = 66;

height=canh+3;

// Handle Thickness
thick=15;
$fa=1;

// Grip
intersection () {
	cube([height,50,thick]);
	difference () {
		translate([height/2,-120,0])cylinder(r=150,h=thick);
		translate([height/2,-120,-1]) cylinder(r=150-thick,h=thick+2);
// Grip Text
if (bold=="Yes") {translate([height/2,-120,thick]) writecircle(text,[0,0,0],150-thick/2,t=4,h=8, space=1.1);}
else {translate([height/2,-120,thick]) writecircle(text,[0,0,0],150-thick/2,t=4,h=8, space=1);}
if (bold=="Yes"){translate([height/2,-120,thick]) rotate ([0,0,.2])writecircle(text,[0,0,0],150-thick/2,t=4,h=8, space=1.1);}
}
}
if (raise=="Yes") {
	if (bold=="Yes") {translate([height/2,-120,thick]) writecircle(text,[0,0,0],150-15/2,t=3,h=8, space=1.1);}
	else {translate([height/2,-120,thick]) writecircle(text,[0,0,0],150-15/2,t=3,h=8, space=1);}
	if (bold=="Yes"){translate([height/2,-120,thick]) rotate ([0,0,.2])writecircle(text,[0,0,0],150-15/2,t=3,h=8, space=1.1);}
}

difference() {
translate([0,-5,0]) cube([10,10,thick]);
translate([13,-5,-1]) cylinder(r=10,h=thick+2);
}
difference() {
translate([height-10,-5,0]) cube([10,10,thick]);
translate([height-13,-5,-1]) cylinder(r=10,h=thick+2);
}

// Top clip
translate([0,-31,0])cube([3,45,thick]);
difference() {
	translate([0,-27.5,0])cube([6,3.5,thick]);
	translate([3,-53,thick/2])rotate ([0,90,0]) cylinder(r=27,h=5);
}
intersection() {
	translate([0,-31,0])cube([6,6,thick]);
	translate([0,-53,thick/2])rotate ([0,90,0]) cylinder(r=25,h=10);
}

// Bottom clip
translate([height-3,-37,0])cube ([3,52,thick]);

difference() {
	translate([height-9,-29,0])cube ([9,10,thick]);
	translate([height-11.9,-53,thick/2])rotate ([0,90,0]) cylinder(r2=26,r1=cand/2,h=9);
}

intersection() {
	translate([height-7,-37,0])cube ([7,10,thick]);
	translate([height-9,-53,thick/2])rotate ([0,90,0]) cylinder(r=21,h=10);
}
```


[User]
Okay, I'd like to design a customizable coaster and holder set, and I need some help with the OpenSCAD code. I've been playing around with translucent PLA and want to keep the coasters thin to really show off the colors.

Here's what I'm thinking:

**Coaster Design:**

*   **Overall Shape:** The coaster should be circular with a slightly tapered profile. It should be wider at the top and narrower at the bottom.
*   **Base/Floor:** It should have a thin flat base.
*   **Ribs:** The coaster should have concentric circular ribs on top. These ribs are important for rigidity, reducing contact area, and providing some grip.
*   **Dimensions:**
    *   I want to be able to adjust the overall diameter of the coaster.
    *   I want to control the height of the coaster, and the thickness of the base.
    *   I also need to be able to control the number and spacing of the concentric ribs, as well as their height and width.

**Holder Design:**

*   **Functionality:** The holder should be able to hold multiple coasters in an upright position.
*   **Shape:** The holder should be a cylindrical container, with the same tapered shape as the coaster, with a bottom floor, but with cutouts to easily retrieve the coasters.
*   **Dimensions:**
    *   I need to be able to set the number of coasters the holder should hold.
    *   The holder's height should be adjustable, and should be taller than the coasters
    *   The diameter should be automatically calculated based on the number of coasters and their diameter.
    *   I need to be able to control the width of the bottom floor.
    *   The cutouts should be placed equidistant, and I need to be able to control their size.
    *   The holder should have "legs" on either side of the cutouts to balance the cutouts.

**General Customization:**

*   I need parameters for all of the dimensions, as described above so I can quickly make changes and see the effects.
*   I'd like to be able to adjust the `fa` parameter for smoother curves, although a value of 1 is likely good enough.

**Desired Output:**

I'd like an OpenSCAD file that defines these parametric modules:

*   `coaster()`
*   `holder()`
*   `coaster_set()` or something similar that would make the same number of coasters as the holder has spaces for.
*   I should be able to render just the `coaster()`, just the `holder()`, or the `coaster_set()`.

Can you help me create this parametric OpenSCAD file? I do not need any external libraries, just the base OpenSCAD primitives.

[Assistant]
coaster.scad:
```
rib_height=3;
rib_width=.6;
floor_width=.6;
holder_height=40;

$fa=1;
render() {
coaster();
//two_coasters();
//holder();
//holder_1coaster();
//holder_2coasters();
}

module ribs() {
    difference() { cylinder(h=rib_height, r=41); cylinder(h=3, r=40.4); }
    difference() { cylinder(h=rib_height, r=36); cylinder(h=3, r=35.4); }
    difference() { cylinder(h=rib_height, r=31); cylinder(h=3, r=30.4); }
    difference() { cylinder(h=rib_height, r=26); cylinder(h=3, r=25.4); }
    difference() { cylinder(h=rib_height, r=21); cylinder(h=3, r=20.4); }
    difference() { cylinder(h=rib_height, r=16); cylinder(h=3, r=15.4); }
    difference() { cylinder(h=rib_height, r=11); cylinder(h=3, r=10.4); }
    difference() { cylinder(h=rib_height, r=6);  cylinder(h=3, r=5.4); }
}

module coaster() {
  union() {
    difference() {
      cylinder(h=5, r1=43, r2=49);
      translate([0,0,floor_width]) cylinder(h=5, r1=42, r2=48);
    }
    ribs();
  }
}

module holder() {
  difference() {
    union() {
      difference() {
        cylinder(h=holder_height, r=50+rib_width);
        translate([0,0,floor_width]) {
          cylinder(h=5, r1=42, r2=48);
          translate([0,0,5]) cylinder(h=holder_height, r=50);
        }
      }
      ribs();
    }
    union() {
      translate([60,0,0]) cylinder(h=holder_height, r=52);
      translate([-60,0,0]) cylinder(h=holder_height, r=52);
    }
  }
}

module two_coasters() {
  translate([-50,0,0]) coaster();
  translate([50,0,0]) coaster();
}

module holder_2coasters() {
  holder();
  translate([-60,0,0]) coaster();
  translate([60,0,0]) coaster();
}

module holder_1coaster() {
  translate([-40,0,0]) {
    holder();
    translate([60,0,0]) coaster();
  }
}
```


[User]
Okay, I need a parametric OpenSCAD file to create a bracket for a NEMA 17 stepper motor.

Here's what I'm looking for:

*   **Basic Shape:** The bracket should be essentially a cube with the NEMA 17 motor recessed inside. The motor will sit flush, or slightly recessed, in the cube's main volume. It needs to have a surrounding wall of configurable thickness to hold the motor.
*   **Mounting Flaps:**  Extending out from one side of the main cube I need a mounting flap of adjustable length, that is basically a rectangular cube shape. This will allow the bracket to be attached to a structure. I would like one on each side.
*   **Mounting Holes:** I need mounting holes on the mounting flaps. The positions for these should be parametric so I can move them around. For now, assume 2 on the bottom flap and 1 on the top flap.
*   **NEMA 17 Recess:**  The recess for the NEMA 17 motor should precisely fit a standard NEMA 17.  This means it needs to account for the motor's size, mounting bolts, and the crown (protruding cylinder) on the motor.
*  **Motor Bolt Holes:** The bracket should include cutouts for the 4 bolts used to secure the motor, and these need to match the standard NEMA 17 bolt hole pattern. The holes should be of a configurable diameter, likely slightly larger than the screws being used to mount the motor.
*   **Fillets/Chamfers:** I'd like the option to add fillets or chamfers to the *inner* corners of the NEMA 17 motor recess for easier printing and added strength, controlled by a Boolean parameter.
*   **Parametric Design:** I need to be able to adjust the following parameters:
    *   `bracket_wall_width`: Thickness of the bracket's walls surrounding the motor.
    *   `bracket_depth`: The overall depth of the bracket (how far it extends outward).
    *   `bracket_flaps`: The length of the mounting flaps.
    *   `bracket_bolts_diameter`: The diameter of the mounting holes on the mounting flaps.
    *   `bevel_inner_corners`: A boolean value to specify if we use the bevels on the inner corner.
    *   `nema_side`: Side of the NEMA 17.
	*  `nema_bolts`: The distance between the NEMA 17 mounting holes.
    *   `nema_depth`: Depth of the NEMA 17.
	*  `nema_crown`: The depth of the circular protrusion on the face of the NEMA 17.
	*  `nema_bolt_radious`: The radius of the bolts used to mount the NEMA 17.
* **Units:** Please use millimeters as the unit of measurement.
* **Libraries:** I would like you to create this design without relying on any external OpenSCAD libraries like MCAD or BOSL. Please include all the code in a single file.

I think this covers all the details. Let me know if you have any questions.

[Assistant]
nema17_bracket.scad:
```
// preview[view:north west, tilt:top diagonal]

bracket_wall_width = 3;
bracket_depth = 25.4; // 1 inch
//lengths of tabs
bracket_flaps =  25.4;
bracket_bolts_diameter = 4;
bevel_inner_corners = "yes"; //[yes,no]

module NemaForCSG(nema_side, nema_depth, nema_bolts, nema_crown, nema_bolt_radious)
{
	//bevel corners
	r1 = nema_side/2- nema_bolts/2;
	r2 = sqrt(2)* r1 ;
	r=(r2-r1)*2;

	difference()
	{

		union()
		{
			cube([nema_side,nema_depth,nema_side]);

			translate( [nema_side/2,0,nema_side/2])
				rotate(90,[1,0,0])
				{
					cylinder(r = nema_crown, h = 30, $fn = 40,center=true);
				}

			translate( [nema_side/2,0,nema_side/2])
			{
				//bolt holes
				for(j=[1:4])
				{
					rotate(90*j,[0,1,0])
						translate( [nema_bolts/2.0,0,nema_bolts/2.0])
							rotate(-90,[1,0,0])
							{
								cylinder(r = nema_bolt_radious, h = 30, $fn = 20,center=true);
							}
				}
			}
		}

		if (bevel_inner_corners == "yes")
		{
			//bevel
			translate( [nema_side/2,0,nema_side/2])
			{

				for(j=[1:4])
				{
					rotate(90*j,[0,1,0])
						translate( [nema_side/2,nema_depth/2,nema_side/2])
					rotate(45,[0,1,0])
					cube([30,50,r], center = true);
				}
			}
		}
	}

}

//units are in millimeters
M3 = 3.0/2.0;
nema17_side = 42.2;
nema17_bolts = 31.04;
nema17_depth = 33.8;
nema17_crown = 11;
nema17_bolt_radious = M3;

difference()
{
	union()
	{
		cube([nema17_side+bracket_wall_width*2, bracket_depth, nema17_side+bracket_wall_width*2]);

		translate([-bracket_flaps,0,0])
			cube([nema17_side+(bracket_wall_width+bracket_flaps)*2,bracket_depth,bracket_wall_width]);
	}

	translate([bracket_wall_width + nema17_side + bracket_wall_width + bracket_flaps/2,bracket_depth/2,0])
		cylinder(r = bracket_bolts_diameter/2, h = 30, $fn = 40,center=true);

	translate([-bracket_flaps/2,bracket_depth/2,0])
		cylinder(r = bracket_bolts_diameter/2, h = 30, $fn = 40,center=true);

	translate([bracket_wall_width,bracket_wall_width,bracket_wall_width])
	NemaForCSG(nema17_side, nema17_depth, nema17_bolts, nema17_crown, nema17_bolt_radious);

}
```