[User]
Okay, I'm looking to get a custom earplug design created in OpenSCAD. I have a basic idea but need something that's parametric and easy to adjust for different sizes and shapes.

Here's what I need:

**Core Functionality:**

*   **Basic Plug Shape:** The earplug should start with a rounded, roughly cylindrical shape that tapers slightly at both ends. Think of a typical earplug shape.
*   **Customizable Dimensions:** I need to be able to control the overall diameter (ear hole size in mm) and the length or height of the plug (also in mm).
*   **Groove:** I need a way to control a small groove or indentation around the main cylinder shape. This should be adjustable in size.
*   **Smoothing:** A parameter for smoothing the curves/edges is needed.
*   **Decoration Options:** Instead of a plain plug, I want to be able to add an inner shape or a cut-out from the basic cylinder. The overall plug shape remains intact, but the details will change
*   **Decoration Size:** I need to control the size of the cut-out or inner shape. I would prefer it if it was specifiable as a percentage of the overall plug diameter.
*  **Margin:** When the cut-out decoration is present, I also need a parameter to control the space between the outer plug and the decoration itself. This will allow for dual-extrusion printing.
*   **Resolution:** A resolution control would be nice, something like the `$fn` parameter in OpenSCAD, to adjust the smoothness of curves.

**Specific Shape Options (type):**

I need the following options for the central cut-out/decoration:

*   **Solid:**  A simple, filled plug with no cut-out or inner shape (the basic plug shape).
*   **Hollowed:** This option should create a smaller, hollowed-out plug shape within the main plug.
*   **Star:** A 5-pointed star shape as the cut-out or inner part.
*   **Heart:**  A heart shape as the cut-out or inner part.
*   **Negative Sign:** A minus sign shape as the cut-out or inner part.
*   **Positive Sign:** A plus sign shape as the cut-out or inner part.

**Dual Extrusion Support:**

It should be possible to use the design for dual-extrusion 3D printing. When this is used, the decoration and plug body should be separate objects. To achieve this, I should be able to change the value of the "margin" parameter to specify the gap between the main plug body and the decorative element. In this situation the margin must be set to 0 for the output of multiple STLs.

**Parameters:**

Here's a summary of the parameters I need:

*   `type`: Integer parameter to choose the plug style (0: Solid, 1: Hollowed, 2: Star, 3: Heart, 4: Negative Sign, 5: Positive Sign).
*  `part`: Integer parameter to choose between rendering the Plug (0) or Decoration (1).
*   `diameter`: (mm) Overall diameter of the plug.
*   `weight`: (mm) Height or length of the plug.
*   `groove`: (mm) Size of the groove/indentation.
*   `edges`: (mm) Smoothing factor for curves and edges.
*   `cursor`: (%) Size of the inner shape or cutout (as a percentage of the diameter).
*   `margin`: (mm) Space between the inner shape and the outer plug.
*   `$fn`: Resolution setting for smoothness of curves.

**Code Structure:**

I'm assuming you can write the whole thing in a single OpenSCAD file, so I won't be specifying functions/modules in a particular library. I will not need any libraries like MCAD, BOSL, or similar.

Can you generate an OpenSCAD file that implements this?

[Assistant]
Customizable_Ear_Plug.scad:
```
/* ----------------------------------------------------------------------------
	Customizer Variables
---------------------------------------------------------------------------- */
type     = 2; // [0:Solid,1:Hollowed,2:Star,3:Heart,4:Negative Sign,5:Positive Sign]
// for display only, doesn't contribute to final object
part     = 0; // [0:Plug,1:Decoration]
// or ear hole in mm
diameter = 10;
// or height in mm
weight   = 11;
// (baby) in mm
groove   = 1;
// smoothing (0.5 to 2 is good values)
edges    = 1;
// or the size of the inner piece in percent : %
cursor   = 100; // [10:100]
// or the gap between the inner and outer piece
margin   = 0.1;
// resolution
$fn = 50;

/* ----------------------------------------------------------------------------
	Curve Module By Skarab, 2013
	Original script By Don B, 2011
	Released into the Public Domain
	http://www.thingiverse.com/thing:8931
---------------------------------------------------------------------------- */
module Curve(p1, p2, cursor, steps = 5, filled = true)
{
	stepsize1 = (cursor - p1) / steps;
	stepsize2 = (p2 - cursor) / steps;

	for (i = [0:steps - 1])
	{
		assign(point1 = p1 + stepsize1 * i)
		assign(point2 = cursor + stepsize2 * i)
		assign(point3 = p1 + stepsize1 * (i + 1))
		assign(point4 = cursor + stepsize2 * (i + 1))
		{
			assign(bpoint1 = point1 + (point2 - point1) * (i / steps))
			assign(bpoint2 = point3 + (point4 - point3) * ((i + 1) / steps))
				polygon(points = [bpoint1, bpoint2, filled ? p1 : cursor]);
		}
	}
}

/* ----------------------------------------------------------------------------
	Filled Plug Module
---------------------------------------------------------------------------- */
module plug(w = weight, d = diameter, g = groove, e = edges)
{
	// External Radius
	r = (d / 2) + g;

	// Curves Points
	p1 = [-e, 0];
	p2 = [0, e];
	p3 = [0, w - e];
	p4 = [-e, w];

	// Curves Cursors
	c1 = [0, 0];
	c2 = [-g * 2, w / 2];
	c3 = [0, w];

	// Plug Creation
	rotate_extrude($fn = 180)
		translate([r, 0, 0])
			union()
			{
				Curve(p1, p2, c1, 10, true);
				Curve(p2, p3, c2, 40, false);
				Curve(p3, p4, c3, 10, true);
				polygon(points=[p1, p2, c2, p3, p4, [-r, w], [-r, 0]]);
			}
}

/* ----------------------------------------------------------------------------
	Return X percent From Y
---------------------------------------------------------------------------- */
function percent(x, y) = ((y) / 100) * x;

/* ----------------------------------------------------------------------------
	Hollowed Plug Module
---------------------------------------------------------------------------- */
module hollowed_plug()
{
	d = percent(cursor, diameter - 3);

	difference()
	{
		plug();

		if (d > 2)
		{
			translate([0, 0, -edges])
				plug(weight + (2 * edges), d);
		}
	}
}

/* ----------------------------------------------------------------------------
	Parametric star
	(c)  2010 Juan Gonzalez-Gomez (Obijuan) juan@iearobotics.com
	GPL license

	http://www.thingiverse.com/thing:5052

	The 2*N points of an N-ponted star are calculated as follows:
	There are two circunferences:  the inner and outer.  Outer points are located
	at angles: 0, 360/N, 360*2/N and on the outer circunference
	The inner points have the same angular distance but they are 360/(2*N) rotated
	respect to the outers. They are located on the inner circunference

	INPUT PARAMETERS:
	N: Number of points
	h: Height
	ri: Inner radius
	ro: outer radius
---------------------------------------------------------------------------- */
module parametric_star(N = 5, h = 3, ri = 15, re = 30)
{
	// Calculate and draw a 2D tip of the star
	// n: Number of the tip (from 0 to N-1)
	module tipstar(n)
	{
		i1 = [ri*cos(-360*n/N+360/(N*2)), ri*sin(-360*n/N+360/(N*2))];
		e1 = [re*cos(-360*n/N), re*sin(-360*n/N)];
		i2 = [ri*cos(-360*(n+1)/N+360/(N*2)), ri*sin(-360*(n+1)/N+360/(N*2))];

		polygon([ i1, e1, i2]);
	}

	// Draw the 2D star and extrude
	// The star is the union of N 2D tips.
	// A inner cylinder is also needed for filling
	// A flat (2D) star is built. The it is extruded
	linear_extrude(height = h)
		union()
		{
			for (i=[0:N-1])
				tipstar(i);
			rotate([0,0,360/(2*N)])
				circle(r=ri+ri*0.01,$fn=N);
		}
}

/* ----------------------------------------------------------------------------
	Star Plug Module
---------------------------------------------------------------------------- */
module star_plug()
{
	d      = percent(cursor, (diameter / 2) - 1.5);
	half_d = d / 2;

	if (part == 0)
	{
		difference()
		{
			plug();
			translate([0, 0, -0.01])
				parametric_star(5, weight + 0.02, half_d, d);
		}
	}
	else parametric_star(5, weight, half_d - margin, d - margin);
}

/* ----------------------------------------------------------------------------
	Heart Module By Skarab, 2013
---------------------------------------------------------------------------- */
module heart(s = 10, h = 10)
{
	// Sizes
	hs= s / 2;
	qs= s / 4;

	// Circles
	// Curves Points
	p1 = [-hs, 0];
	p2 = [0, -3 * qs];
	p3 = [hs, 0];
	p4 = [(qs * cos(30)) - qs, qs * sin(30)];
	p5 = [(qs * cos(150)) + qs, qs * sin(150)];

	// Curves Cursors
	c1 = [-hs, -qs];
	c2 = [hs, -qs];
	c3 = [0, qs * sin(150) / 2];

	translate([0, qs, 0])
		linear_extrude(height = h)
			union()
			{
				translate([-qs, 0, 0])
					circle(qs, $fn = 50);
				translate([qs, 0, 0])
					circle(qs, $fn = 50);
				Curve(p1, p2, c1, 20, true);
				Curve(p2, p3, c2, 20, true);
				Curve(p4, p5, c3, 20, false);
				polygon(points = [p1, p2, p3]);
				polygon(points = [p4, c3, [0, 0]]);
				polygon(points = [p5, c3, [0, 0]]);
			}
}

/* ----------------------------------------------------------------------------
	Heart Plug Module
---------------------------------------------------------------------------- */
module heart_plug()
{
	d      = percent(cursor, diameter / 1.414);
	half_d = d / 2;
	y      = ((half_d * 1.414) - half_d) / 3;

	if (part == 0)
	{
		difference()
		{
			plug();
			translate([0, -y, -0.01])
				heart(d, weight + 0.02);
		}
	}
	else heart(d - margin, weight);
}

/* ----------------------------------------------------------------------------
	Negative Sign Module
---------------------------------------------------------------------------- */
/*
module negative_sign(d, w)
{
	h = d / 4;
	r = h / 2;
	x = (d / 2) - r;

	hull()
	{
		translate([-x, 0, 0])
			cylinder(h = w, r = r);
		translate([x, 0, 0])
			cylinder(h = w, r = r);
	}
}
*/

module negative_sign(d, w)
{
	h = d / 4;

	translate([-d/2, -h/2, 0])
		cube([d, h, w]);
}

/* ----------------------------------------------------------------------------
	Negative Sign Plug Module
---------------------------------------------------------------------------- */
module negative_sign_plug()
{
	d = percent(cursor, diameter - 3);

	if (part == 0)
	{
		difference()
		{
			plug();
			translate([0, 0, -0.01])
				negative_sign(d, weight + 0.02);
		}
	}
	else negative_sign(d - margin, weight);
}

/* ----------------------------------------------------------------------------
	Positive Sign Module
---------------------------------------------------------------------------- */
module positive_sign(d, w)
{
	negative_sign(d, w);
	rotate([0, 0, 90])
		negative_sign(d, w);
}

/* ----------------------------------------------------------------------------
	Positive Sign Plug Module
---------------------------------------------------------------------------- */
module positive_sign_plug()
{
	d = percent(cursor, diameter - 3);

	if (part == 0)
	{
		difference()
		{
			plug();
			translate([0, 0, -0.01])
				positive_sign(d, weight + 0.02);
		}
	}
	else positive_sign(d - margin, weight);
}

/* ----------------------------------------------------------------------------
	Plug Creation
---------------------------------------------------------------------------- */
if (type == 1)      hollowed_plug();
else if (type == 2) star_plug();
else if (type == 3) heart_plug();
else if (type == 4) negative_sign_plug();
else if (type == 5) positive_sign_plug();
else                plug();

```


[User]
Okay, so I'm trying to design a universal hose adapter, kind of like a double-ended cone with barbs to help keep hoses from slipping off. I found this SCAD file online, but I'd like to have more control over the parameters and have the option of more complex barbs, maybe. I'd also like it to be easier to change the basic shape without diving deep into the code.

Here's a breakdown of what I need and what I'm thinking:

**Overall Shape:**

*   The adapter is essentially two hollow cones connected by a short cylindrical or slightly tapered section.
*   One cone is intended for a smaller hose, the other for a larger hose.
*   The cones have different diameters at their base and top, and they have different heights and wall thicknesses.
*   The connection between the cones (the junction) also has a height.
*   All dimensions should be adjustable using parameters.

**Specific Parameters I need:**

*   **Top Cone:**
    *   `cone2_max`: Base diameter of the top cone (usually slightly bigger than the top diameter).
    *   `cone2_min`: Top diameter of the top cone (usually slightly smaller than the base radius).
    *   `cone2_height`: Height of the top cone.
    *   `cone2_wall`: Wall thickness of the top cone.
    *   `cone2_barb_width`: Protruding width of barb-like outer rings on the top cone (0 to disable).
*   **Bottom Cone:**
    *   `cone1_min`: Base diameter of the bottom cone (outside of the lower cone).
    *   `cone1_max`: Top diameter of the bottom cone.
    *   `cone1_height`: Height of the bottom cone.
    *   `cone1_wall`: Wall thickness of the bottom cone.
    *   `cone1_barb_width`: Protruding width of barb-like outer rings on the bottom cone (0 to disable).
*   **Junction:**
    *   `join_height`: Height of the connecting section between the cones.
*   **Barb Parameters (advanced):**
    *   `barb_flatness_ratio`:  Sets barb height as a factor of barb size. (e.g., 1.0 means 45° barbs, 2.0 makes flatter barbs)
    *   `barb_spacing_ratio`: Sets barb spacing as a factor of barb height. (0 means adjacent barbs, 1 gives an identical flat space as the barbs).
    *   `barb_skew_ratio`: Adjusts the barb shape to avoid overhangs.  (0.5 is symmetrical, <0.5 is concave, >0.5 is reversed/probably useless)
*   **Other:**
    *   `check_guts`: A boolean to enable or disable a slice through the adapter to check the internal shape, though I'd like to have a more robust method for debugging and verifying the model before printing.

**Enhancements I'd Like:**

*   **Simplified shape control:** Instead of `cone1_min`, `cone1_max`, etc. I'd prefer using a more generic `outer_diameter_1`, `inner_diameter_1` and a similar one for each cone as well as the connection zone. Similarly, height for each cone and connection, wall thickness, etc.
*   **More Barb Shape Options:**  I'd like to explore beyond the triangular profile used in the original SCAD file. Maybe options for rounded barbs, or sawtooth barbs. Perhaps a user-defined profile could be provided for the barb.
*   **Barb Placement Control:** The original code has a fairly simple approach to barb placement. Perhaps an option for a fixed number of barbs at each part of the cones, or even a pattern (like different spacing in different cone sections.)
*   **Preview:** A more robust option to make sure the adapter meets my needs before I print, as well as easy visual differentiation (for example via color) of the various parts.
*   **Parameter Naming:** More descriptive parameter names for ease of use (e.g. `top_cone_base_diameter` instead of `cone2_max`)

**Libraries:**

I'm not sure about which specific libraries you would suggest, but having access to a library with standard OpenSCAD primitives would help, including some of the more advanced features that may be present in some of them.

Essentially, I want a fully parametric and customizable universal hose adapter that's easy to tweak. I prefer to specify the diameters instead of the radius, so please use `diameter` and not `radius`.

Can you generate the SCAD code for this?

[Assistant]
universal_hose_adapter3.scad:
```
// preview[view:north east, tilt:top diagonal]

// Top cone base diameter. Usually equal or slightly bigger than the top diameter.
cone2_max=30;

// Top cone top diameter. Usually equal or slightly smaller than the base radius
cone2_min=28;

// Height of the top cone
cone2_height=20;

// Wall thickness of the top cone
cone2_wall=3;

// Top cone protuding width of barb-like outer rings to prevent the hose from slipping (zero to disable)
cone2_barb_width=0;

// Bottom cone base diameter (the outside of the lower cone. Usually equal or slightly smaller than the top, unless you want to make a funnel)
cone1_min=15;

// Bottom top diameter (usually equal or slightly bigger than the base radius, unless you want to make a funnel)
cone1_max=18;

// Height of the bottom cone
cone1_height=30;

// Wall thickness of the bottom cone
cone1_wall=2;

// Bottom cone protuding width of barb-like outer rings to prevent the hose from slipping (zero to disable)
cone1_barb_width=0.8;

// Junction height: how tall is the connection between the two cones. Make sure it is thick enough so as to avoid excessively thin walls and/or steep inner overhang. Twice the wall thickness is a good starting value.
join_height=3;

// Barb flatness ratio (advanced). Sets barb height as a factor of barb size. Eg. 1.0 means a 1:1 x/y aspect ratio (aka 45°), and 2.0 makes a flatter barb.
barb_flatness_ratio=2;

// Barb spacing ratio (advanced). Sets barb spacing as a factor of barb height. So 0 means adjacent barbs, and 1 give an identical flat space as the barbs themselves.
barb_spacing_ratio=2;

// Barb symetry ratio (advanced). Avoid overhang by using a strictly positive value (easier print). Symetrical barbs correspond to 0.5. Negative values give concave barbs, and makes sense only for the lower cone. Values higher than 0.5 lead to reversed barbing (probably useless). -0.2 to 1.2 are good values
barb_skew_ratio=0.15;

// This is only useful to double-check the objet shape and walls before printing
check_guts=0; // [0:no,1:yes]

//
// universal_hose_adapter.scad
//
// By Jérémie FRANCOIS / MoonCactus / contact@tecrd.com
//
// Check the webservice on http://www.tecrd.com/page/liens/universal_hose_adapter (temporary URL)
// Remixed for the Thingiverse customizer (less usable imo for now...)
//

// $fa=10;		// how fine the curved objets are (max angle between broken parts)
tol=1*0.05;	// tolerance (mostly useful for openscad preview)

function xpos(dmin, dmax, height, hpos) = ( dmin+(dmax-dmin)*hpos/height )/2;

module hollow_cone(dmin, dmax, height, wall, barb_width) // TODO: spokes
{
	if(dmin>0 && dmax>0 && height>0)
	{
		// Hollow cone body
		difference()
		{
			cylinder(r1=dmin/2, r2=dmax/2, h=height);
			if(wall>0)
				translate([0,0,-tol])
					cylinder(r1= dmin/2-wall, r2= dmax/2-wall, h=height+2*tol);
		}
		// Babed-like rings
		if(barb_width>0 && barb_flatness_ratio!=0)
		{
			for(bs=[barb_width*barb_flatness_ratio : 1 : barb_width*barb_flatness_ratio]) // this is just to simulate a "local" variable... :(
			{
				for(hpos=[
					bs/2
					: barb_width * barb_flatness_ratio * (1 + barb_spacing_ratio)
					: height - bs/2]
				)
				{
					translate([0,0,hpos])
					rotate_extrude()
						polygon( points=[
							[xpos(dmin,dmax,height,hpos)-tol, 0],
							[xpos(dmin,dmax,height,hpos + bs*(1-barb_skew_ratio)) + barb_width, bs * (1-barb_skew_ratio)],
							[xpos(dmin,dmax,height,hpos + bs)-tol, bs],
						] );
				}
			}
		}
	}
}

	difference()
	{
		union()
		{
			color([1,0,0])
			hollow_cone(cone1_min, cone1_max, cone1_height, cone1_wall, cone1_barb_width);

			color([0,0,1])
				translate([0,0,cone1_height+join_height+cone2_height])
					rotate([180,0,0])
						hollow_cone(cone2_min, cone2_max, cone2_height, cone2_wall, cone2_barb_width);

			// intermediate section
			if(join_height>0)
			{
				color([0,1,0])
				translate([0,0,cone1_height])
				rotate_extrude()
					polygon( points=[
						[ cone1_max/2-cone1_wall, 0],
						[ cone1_max/2, 0],
						[ max(cone1_max,cone2_max)/2, join_height/2],
						[ cone2_max/2, join_height],
						[ cone2_max/2-cone2_wall, join_height],
						[ min(cone1_max/2-cone1_wall,cone2_max/2-cone2_wall), join_height/2],
					] );
			}
		}

		if(check_guts!=0)
		{
			// I failed to understand how/if the customizer default view worked, so I split the part twice at opposite places... :p
			scale([0.5,1,1]) rotate([0,0,45]) translate([0,0,-tol]) cube([100,100,100]);
			//scale([0.5,1,1]) rotate([0,0,180+45]) translate([0,0,-tol]) cube([100,100,100]);
		}
	}

```


[User]
Okay, I'm looking to create a customizable spool holder for my MakerBot Replicator 2. I've found a good starting point with a design called "Prm_R2_spool_holder.scad", but it's not quite as flexible as I need it to be, and I'd like it to be more robust.

Specifically, the existing design allows for adjusting the spool width and the spool hole diameter, which is good. However, I want to add some more parameters and flexibility.

Here are the specifics I'd like in my new parametric design, keeping some parameters from the existing design:

*   **Spool Width:** This should still be adjustable. I need a parameter to control the distance between the vertical supports that hold the spool, like in the original.
*   **Spool Hole Diameter:** I want to continue to be able to adjust the diameter of the hole that the spool will sit on.
*   **Base Plate Thickness:** I need a parameter to adjust the thickness of the base plate that the support structure sits on. This wasn't adjustable in the original.
*   **Support Arm Thickness:** I want a parameter to control the thickness of the vertical support arms that hold the spool rod.
*   **Support Arm Height:** I need to be able to control the height of the support arms above the baseplate.
*  **Spool Rod Diameter:** I also need a parameter to control the diameter of the rod that holds the spool, independent of the spool hole diameter. This will need to be slightly smaller than the spool hole diameter for ease of fit.
*   **Mounting Hole Diameter:**  I want to add parameters to include mounting holes in the base plate and to control the diameter of these holes. I'll probably want two mounting holes.
*  **Mounting Hole Placement:** I would also like to control the distance between the center of the mounting holes and the edges of the base plate.

I'd like the design to be relatively robust and printable without supports. I'm comfortable with the basic OpenSCAD functions, but I'd like to take advantage of any helpful modules within the BOSL2 library. Specifically, I think some of the BOSL2 utility functions for creating fillets and rounded edges would be useful in making it look and print better.

I'd like to keep the basic layout of the original design, where there is a base plate, two vertical support arms, and a rod that holds the spool. But I want all the above parameters to make it truly flexible and parametric for different types of spools and mounting situations.

Could you design me a parametric OpenSCAD file that incorporates all of these features using BOSL2? I don't need the original scad file anymore, so I can just work from scratch.

[Assistant]
Prm_R2_spool_holder.scad:
```
// Parametric spool holder for MBI R2 by Woale

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

// Unit
unit = 1; // [1:mm,25.4:inch]

// How long should the spool holder be (between ribbons) ?
spool_width = 130;

// What's the size of the spool hole ?
spool_hole_diameter = 30;

//variables
spl_l=spool_width*unit;
spl_d=spool_hole_diameter*unit;

//fix
$fn=48*2;
spl_r=spl_d/2*1;
plt_w=spl_d*1.5*1;

//plate holder
module plt_hld()
{
	//box1
	cube([34,5,spl_d]);
	//box2
	translate([28-9,0,0]) cube([6,16,spl_d]);
	//box3
	translate([28-9,11,0]) cube([plt_w,5,spl_d]);
}

//spool extensions
module spl_ext()
{
	translate([28-9+(plt_w/2)-(spl_r/5),16+5,spl_r]) rotate([270,0,0]) cylinder(5,spl_r,spl_r);
	translate([28-9+(plt_w/2)-(spl_r/5),16+5+spl_l+10,spl_r]) rotate([270,0,0]) cylinder(5,spl_r,spl_r);
}

//spool holder
module spl_hld()
{
	union()
	{
		difference()
		{
			union()
			{
				translate([28-9+(plt_w/2),11,spl_r]) rotate([270,0,0]) cylinder(spl_l+15+10,spl_r,spl_r);
				spl_ext();
			}
			translate([28-9+(plt_w/2),0,0]) cube([spl_d,spl_l+16+25,spl_d]);
		}
	translate([28-9+(plt_w/2),11,spl_r]) rotate([270,0,0]) scale([.5,1,1]) cylinder(spl_l+15+10,spl_r,spl_r);
	}
}

//level
translate([0,0,-spl_r/10]) intersection()
{
	union()
	{
		spl_hld();
		plt_hld();
	}
	translate([0,0,spl_r/10]) cube([28-9+plt_w,spl_l+16+20,spl_d-(spl_r/10*2)]);
}

```


[User]
Okay, I'm trying to design a parametric hat block for millinery using OpenSCAD. I've been working on it, and have a couple of iterations of my code attached, but I'm running into issues with proper scaling, especially when it comes to the holes and hand holds. Also, my latest version has some very strange behavior when the head size is altered.

Here's what I'm looking for:

**Overall Goal:** A 3D printable hat block, designed to be a base for shaping felt hat bodies. It should consist of three main parts that interlock: a crown, a brim, and a top piece to secure the crown's shape. The hat block needs to be parametric for head size.

**Key Requirements:**

*   **Parametric Head Size:** The design must be adjustable based on a head circumference parameter, likely in inches. Let's call this parameter `head_size`. I'd want to be able to scale this across a reasonable range, perhaps 15 to 25 inches.
*   **Crown:** The crown should have a rounded, somewhat conical shape with a slight depression on the top. It should also have a curve that is shaped to follow the basic shape of a head (but not so tight that it would be difficult to get a felt body over it.) I would also like depressions on the front sides.
*   **Brim:** The brim should be a separate piece that slots into the base of the crown. It should have a gentle, upward curving shape. I would also like a "rope line" indentation on the brim, which would help shape the brim of the hat. I would like the brim to be hollow, but the walls of the hollowed out section to be solid enough to hold it's shape.
*   **Top Piece:** A smaller, removable piece that fits into the depression on top of the crown and reinforces the shape.
*   **Dowel Holes:** There should be dowel holes on the sides of both the brim and the crown to help with alignment. These dowel holes need to scale with the head size parameter. I'd like the dowel holes to be 0.25 inches in diameter, and 1.5 inches in height.
*   **Hand Holds:** There should be a couple of rounded indentations on the crown to function as hand holds. They also need to scale with the head size parameter, but they should always be a comfortable size to grip. I'd also like to have two hand-hold bars on the top piece, which also need to be a comfortable size.
*   **Hole and depression placement:** I would prefer to leave all of the placements as I have them in the attached file, and focus on the problems with scaling.
*   **Units:** I’m working in inches, but the model is in mm, please remember that 25.4mm = 1 inch.

**Specific Issues with my Code:**
*   **Scaling:** The major issue is scaling of dowel holes and hand holds. They need to stay a consistent physical size while scaling the rest of the design. When I try to scale it, the holes are altered as well.
*   **Strange Behavior:** When I adjust the head size the head curve in the crown becomes very distorted.
*   **Top Piece:** the top piece is a good basic shape, but it could do with an easier connection to the depression in the crown.

**Desired Approach:**
I would like the scaling to be based on a circumference, but the rest of the code should remain the same unless there is a more elegant or simple approach. The dowel holes and hand holds should remain the same size regardless of the head size and should not scale. I would also like the head shaped curves and depressions to remain mostly the same when scaling, so that they fit as intended for different head sizes. I would also like the scaling to be easily understood, since I am still learning the best way to approach parametric design.

**Libraries:**
I don't have any specific library requirements, but if you think something from one of the standard OpenSCAD libraries like MCAD or BOSL2 would help with scaling or creating the curved surfaces, please use it!

Could you please create a new parametric OpenSCAD file that addresses these requirements and the issues I'm facing? I'd really appreciate the help!

[Assistant]
Fedora.scad:
```
$fn = 60;

//Measure the circumference of your head in inches
head_size = 18; // [15:25]

scale([head_size/22,head_size/22,head_size/22]){ // scale block set for hat size
  scale([25.4,25.4,25.4]){ // scale mm to inches
    difference(){ // crown
      translate([-0.875,0,0]) difference(){
        union(){
          intersection(){
            difference(){
              hull(){ // crown block solid
                linear_extrude(height=4) hull(){ // top of crown shape
                  circle(2.75);
                  translate([2.5,0,0]) circle(1.5);
                }
                translate([1-0.125,0,0]) scale([7.5/6.5,1,1]) sphere(3.25); // base of crown, head shape
              }
              rotate([0,7,0]) translate([-0.6,0,5]) hull(){ // depression on top of crown
                sphere(2.75);
                translate([2.5,0,0]) sphere(1.5);
              }
            }
            translate([-5,-5,0]) cube(10); // cut off negative z values
          }
          intersection(){ // head curve in the crown
            linear_extrude(height=6) hull(){
              circle(2.75);
              translate([2.5,0,0]) circle(1.5);
            }
            translate([0,0,-2]) rotate([0,-7,0]) scale([1.25,1,1]) sphere(6);
          }
        }
        translate([4.75,4.5,3.25]) scale([1,1,0.9]) sphere(3.5); // side depressions on front of crown
        translate([4.75,-4.5,3.25]) scale([1,1,0.9]) sphere(3.5);
      }
      translate([1.5,0,-0.5]) cylinder(r=0.25,h=1.5); // dowel holes
      translate([-1.5,0,-0.5]) cylinder(r=0.25,h=1.5);
      translate([0,-2,-0.5]) cylinder(r=0.5,h=3.5); // hand holds
      translate([0,0,-0.5]) cylinder(r=0.75,h=3.5);
      translate([0,2,-0.5]) cylinder(r=0.5,h=3.5);
    } // end crown

    translate([-10,0,2.125]) union(){ // brim
      difference(){
        difference(){
          translate([0,0,-1]) scale([11/9.25,1,0.30]) sphere(4.625); // curve of the brim
          translate([-6,-4.625,-11]) cube([12,9.25,10]); // cut off top and bottom
          translate([-6,-4.625,0]) cube([12,9.25,10]);
		}
        translate([1.5,0,-1]) cylinder(r=0.25,h=1.5); // dowel holes
        translate([-1.5,0,-1]) cylinder(r=0.25,h=1.5);
      }
      difference(){
        union(){
          scale([11/9.25,1,1]) translate([0,0,-1.125]) cylinder(r=4.625-0.125,h=0.125); // rope line
          scale([11/9.25,1,1]) translate([0,0,-2.125]) cylinder(r=4.625,h=1); // base
        }
        scale([11/9.25*0.75,0.75,1]) translate([0,0,-2.25]) cylinder(r=4.625,h=0.75); // hollow bottom
      }
    } // end brim

    translate([9,0,5]) rotate([0,180,180]) union(){ // top piece
      intersection(){
        difference(){
          rotate([0,7,0]) translate([-0.6,0,5]) hull(){ // opposite of depression on top of crown
            sphere(2.75);
            translate([2.5,0,0]) sphere(1.5);
          }
          translate([0,0,-2]) rotate([0,-7,0]) scale([1.25,1,1]) sphere(6); // opposite of head shape
        }
        linear_extrude(height=5) hull(){ // crown shape, limits size of top piece
          circle(2.75);
          translate([2.5,0,0]) circle(1.5);
        }
      }
      difference(){
        translate([-4.5,-1,4.5]) cube([10,2,0.5]); // hand hold bar
        translate ([-1,0,0])scale([4,1,1]) rotate([0,0,45]) translate([1,-2,0]) cube([1,1,6]); // rope cut outs
        translate ([-15,0,0])scale([4,1,1]) rotate([0,0,45]) translate([1,-2,0]) cube([1,1,6]);
      }
    } // end top piece

  }
}

```
Fedora.scad:
```
$fn = 100;

//Measure the circumference of your head in inches
head_size = 17; // [15:25]

scale([head_size/22,head_size/22,head_size/22]){ // scale block set for hat size
  scale([25.4,25.4,25.4]){ // scale mm to inches

    intersection(){ //crown
      difference(){
        translate([-0.875,0,0]) difference(){
          union(){
            intersection(){
              difference(){
                hull(){ // crown block solid
                  linear_extrude(height=4) hull(){ // top of crown shape
                    circle(2.75);
                    translate([2.5,0,0]) circle(1.5);
                  }
                  translate([1-0.125,0,0]) scale([7.5/6.5,1,1]) sphere(3.25); // base of crown, head shape
                }
                rotate([0,7,0]) translate([-0.6,0,5]) hull(){ // depression on top of crown
                  sphere(2.75);
                  translate([2.5,0,0]) sphere(1.5);
                }
              }
              translate([-5,-5,0]) cube(10); // cut off negative z values
            }
            intersection(){ // head curve in the crown
              linear_extrude(height=6) hull(){
                circle(2.75);
                translate([2.5,0,0]) circle(1.5);
              }
              translate([0,0,-2.125]) rotate([0,-7,0]) scale([1.25,1,1]) sphere(6); // head shaped crown
            }
          }
        }
        scale([22/head_size,22/head_size,22/head_size]) translate([1.5,0,-0.5]) cylinder(r=0.25,h=1.5); // dowel holes
        scale([22/head_size,22/head_size,22/head_size])translate([-1.5,0,-0.5]) cylinder(r=0.25,h=1.5);
        scale([22/head_size,22/head_size,22/head_size])translate([0,-1.4,-0.5]) cylinder(r=0.4,h=2); // hand holds
        scale([22/head_size,22/head_size,22/head_size])translate([0,0,-0.5]) cylinder(r=0.75,h=2.5);
        scale([22/head_size,22/head_size,22/head_size])translate([0,1.4,-0.5]) cylinder(r=0.4,h=2);

        translate([2.3,4.7,4]) rotate([0,24,-68])  hull(){ // side depression
          sphere(2.75);
          translate([2.5,0,0]) sphere(1.5);
        }
        translate([2.3,-4.7,4]) rotate([0,24,68])  hull(){ // side depression
          sphere(2.75);
          translate([2.5,0,0]) sphere(1.5);
        }
      }
      translate([-0.25,0,-4.7]) scale([7.5/6.5,1,1]) sphere(9);
    }

    translate([-10,0,2.125]) union(){ // brim
      difference(){
        difference(){
          translate([0,0,-1]) scale([11/9.25,1,0.30]) sphere(4.625); // curve of the brim
          translate([-6,-4.625,-11]) cube([12,9.25,10]); // cut off top and bottom
          translate([-6,-4.625,0]) cube([12,9.25,10]);
		}
        scale([22/head_size,22/head_size,22/head_size])translate([1.5,0,-1]) cylinder(r=0.25,h=1.5); // dowel holes
        scale([22/head_size,22/head_size,22/head_size])translate([-1.5,0,-1]) cylinder(r=0.25,h=1.5);
      }
      difference(){
        union(){
          scale([11/9.25,1,1]) translate([0,0,-1.125]) cylinder(r=4.625-0.125,h=0.125); // rope line
          scale([11/9.25,1,1]) translate([0,0,-2.125]) cylinder(r=4.625,h=1); // base
        }
        scale([11/9.25*0.75,0.75,1]) translate([0,0,-2.25]) cylinder(r=4.625,h=0.75); // hollow bottom
      }
    } // end brim

    translate([9,0,5]) rotate([0,180,180]) union(){ // top piece needs to be redone to match new crown
      intersection(){
        difference(){
          rotate([0,7,0]) translate([-0.6,0,5]) hull(){ // opposite of depression on top of crown
            sphere(2.75);
            translate([2.5,0,0]) sphere(1.5);
          }
          translate([0,0,-2.125]) rotate([0,-7,0]) scale([1.25,1,1]) sphere(6); // opposite of head shape
        }
        linear_extrude(height=5) hull(){ // crown shape, limits size of top piece
          circle(2.75);
          translate([2.5,0,0]) circle(1.5);
        }

      }

     difference(){
        translate([-4.5,-1,4.5]) cube([10,2,0.5]); // hand hold bar
        translate ([-1,0,0])scale([4,1,1]) rotate([0,0,45]) translate([1,-2,0]) cube([1,1,6]); // rope cut outs
        translate ([-15,0,0])scale([4,1,1]) rotate([0,0,45]) translate([1,-2,0]) cube([1,1,6]);
      }
    } // end top piece

  }
}
```


[User]
Okay, I'm working on a pencil clip design and I'd like some help making it more parametric and easier to customize. I've already got a working file, but it's a bit messy and hard to change.

Here's what I'm trying to achieve:

I want a clip that holds a standard pencil, has a clip-like section to attach to a bag strap or notebook cover, and some simple text/iconography on the sides. I'm currently using the MCAD `shapes.scad` and a `write.scad` (specifically for using dxf fonts) libraries for the shapes and text.

Here are the key features I'd like to parameterize:

*   **Pencil Radius:**  The inner radius of the pencil holding section should be adjustable. I'd like to define it as a variable.
*   **Wall Thickness:** The thickness of the walls of the pencil holder and the clip section should be variable.
*   **Clip Length:** The length of the clip part that extends out to grab onto a surface should be variable.
*   **Clip Height:** The overall height of the entire clip should be adjustable.
*   **Text/Iconography:** I would like the text and iconography to be completely customizable. It should be easy to change the string, font, size, and spacing, and rotate the text on the face if needed.
*   **Clip Post Radius:** The radius of the small cylindrical posts that provide the clip tension should be adjustable.
*   **Post Placement:** The placement of those cylindrical posts relative to the main body of the clip should be configurable. This should be relative to the center of the clip.

Here's how my current version works:

The main body is made using a difference of unions. First a cylinder is used to provide the central pencil holding area, then two cubes are cut from the sides to create the clip shape. Then text is added using the write module for a "I" and a smiley face ":)".  Finally, two cylinders are used for the posts on the back of the clip.

I'm looking for a parametric version, probably broken down into modules. I would like to be able to define the clip as a set of modules which allows me to define the various attributes and build the final part. This is what I'm looking for as an output.

Can you help me create a parametric OpenSCAD file for this? Please make sure to use the `MCAD/shapes.scad` and a similar method to what I was doing with `write.scad` (perhaps defining a custom module that does what I was doing) for the text so it uses a dxf font. I want to be able to easily change the text, font, size, and spacing as parameters.

[Assistant]
Clip_I_Smile.scad:
```
include <MCAD/shapes.scad>
use <write.scad>
pencilRadius = 7/2;
wallThickness = 3;
pencilWall = pencilRadius + wallThickness;
height = 38;
length = 35;

difference() {
union() {
cylinder(height,pencilWall,pencilWall,true);
difference () {
translate([-2,-length/2,0])
cube([wallThickness,length,height],true);
translate ([-4,-30,-15]) rotate ([90,0,90]) write("I",h=30,t=2,font="orbitron.dxf");
}
difference () {
translate([2,-length/2,0])
cube([wallThickness,length,height],true);
rotate ([90,90,90]) translate ([-12,-30,2]) write(":)",h=22,t=3,space=.7,font="orbitron.dxf");
}

}

//#cylinder(height+2,pencilRadius,pencilRadius,true);
#hexagon(pencilRadius*2, height+2);

}
translate([3.1,-(length+(wallThickness*0.5)),0])
cylinder(height,wallThickness,wallThickness,true);
translate([-3.1,-(length+(wallThickness*0.5)),0])
cylinder(height,wallThickness,wallThickness,true);

```


[User]
Okay, I'm looking to create a parametric design for a magnetic marker holder, similar to the one I have now (attached as magnetic_marker_holder.scad, but I'd like to get it improved). The basic idea is to have a plastic part that holds both a whiteboard marker and a cube magnet, allowing you to stick the marker to a magnetic surface.

Here are the key features and parameters I need in the design:

*   **Marker Holder:** There should be a cylindrical hole to snugly hold a whiteboard marker. The diameter of this hole should be a parameter I can easily adjust.
*   **Magnet Holder:** There should be a cube-shaped recess to hold a cube magnet. The side length of the cube should be another adjustable parameter. The magnet should fit securely.
*   **Overall Structure:** The basic structure combines a cylinder and an intersecting rectangular solid to create the basic structure. This needs to have enough wall thickness so it's robust, and I would like this thickness to be a settable parameter.
*   **Parametric Design:** I want all of these dimensions to be adjustable through OpenSCAD parameters. Specifically I need:
    *   `pen_diameter`: The diameter of the marker to be held.
    *   `magnet_cube_size`: The side length of the magnet cube.
    *   `min_wall_thickness`: The minimum wall thickness of the plastic.
*   **Clearance:** There should be a little bit of clearance around both the pen and the magnet, to make sure parts fit properly. This could be included in the parameters.
*   **Robustness:** The structure shouldn't be too thin in any part, and should be able to handle some wear. I think having a `min_wall_thickness` parameter handles this, but if there are other areas that need reinforcing, please consider this.
*   **Ease of 3D printing:** The design should print without supports. It should also be relatively simple for a 3D printer to produce.

I don't think I need any specific libraries for this, just standard OpenSCAD functionality. Could you generate an OpenSCAD file that implements these requirements using these parameters?

[Assistant]
magnetic_marker_holder.scad:
```
// author: clayb.rpi@gmail.com
// date: 2013-01-27
// units: mm
//
// description: A small plastic piece to hold a magnet cube
//   and a whiteboard marker together.

// The diameter (mm) of the pen to hold. This should be a tight fit.
PEN_DIAMETER = 11;

// The side length (mm) of the magnet cube (assumed to be equal on all sides).
MAGNET_CUBE_SIZE = 6.55;

// The minimum wall thickness (mm).
MIN_WALL_THICKNESS = 1;

// How detailed the print should be.
$fn=32 + 0; // the '+ 0' prevents customizer from displaying this variable.

// The main unit of height
TOTAL_H =  MAGNET_CUBE_SIZE + 2 * MIN_WALL_THICKNESS;

difference() {
  union() {
  	cylinder(r=PEN_DIAMETER/2 + MIN_WALL_THICKNESS, h=MAGNET_CUBE_SIZE + 2 * MIN_WALL_THICKNESS);

    translate([-TOTAL_H / 2, 0, 0])
    cube([TOTAL_H, PEN_DIAMETER / 2 + TOTAL_H, TOTAL_H]);
  }

  // cut away a place for the pen.
  translate([0, 0, -1])
	cylinder(r=PEN_DIAMETER/2, h=MAGNET_CUBE_SIZE + 2 * MIN_WALL_THICKNESS + 2);

  // cut away a place for the magnet.
  translate([-MAGNET_CUBE_SIZE / 2, PEN_DIAMETER /2 + MIN_WALL_THICKNESS, MIN_WALL_THICKNESS])
  cube([MAGNET_CUBE_SIZE,
        MAGNET_CUBE_SIZE,
        MAGNET_CUBE_SIZE + MIN_WALL_THICKNESS + 1]);
}

```


[User]
Okay, I'm looking to design a parametric filament spool for my 3D printer. I have some leftover filament I'd like to wind onto a smaller spool than the standard ones. I'd like to be able to adjust the size of the spool based on a few key dimensions:

*   **Spool Width:** I need to be able to specify the inner width of the spool (where the filament winds), I need this to be adjustable. I'm thinking it should be at least 10mm, but should be adjustable.

*   **Spool Outer Diameter:** I need control over the outer diameter of the spool walls, that's the diameter of the circles that hold the filament in. I think it would be useful to be able to set this between 70mm and 150mm, but again, it should be adjustable.

*   **Spool Wall Thickness:** I need to define how thick the walls of the spool are, I think at least 3mm is necessary.

*   **Spool Hole Diameter:** I also need to define the diameter of the central hole of the spool. This should be at least 25mm, but should be adjustable.

*   **Filament Diameter:** The spool will also hold a specific diameter of filament. I'll want to be able to choose between 1.75mm and 3mm filament.

My design should create a spool with two outer walls connected by a central core. I'd like the walls to have some kind of recessed area on their inner facing side, possibly with some reinforcing ribs, to help hold the filament in place. I would also like the inner walls to be as smooth as possible.

I'd like the OpenSCAD file to be completely parametric, and use variables for all of these dimensions. I would also like the units to be adjustable, with both mm and inch options, but mm should be the default.

I would like to use a library for the generation of threads in the central hole and for any connectors if they are added. I think the BOLTS library would be useful for this as I know it supports both inch and metric threads.

Can you generate an OpenSCAD file based on these specifications?

[Assistant]
Prm_filemant_spool.scad:
```
// Parametric filament spool by Woale

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

// Unit
unit = 1; // [1:mm,25.4:inch]

// What's the inner spool width ? Recommended >10mm.
spool_width = 20;

// How much should the spool walls outer diameter be ? Recommended 70<150mm.
spool_walls_diameter = 100;

// How much should the spool walls width be ? Recommended >3mm.
spool_walls_width = 3;

// How much should the spool hole inner diameter be ? Recommended >25mm.
spool_hole_diameter = 30;

// What filament should the spool hold ?
filament_diameter = 2; // [2:1.75mm,3.3:3mm]

//variables
spl_l=spool_width*unit;
spl_w_d=spool_walls_diameter*unit;
spl_w_w=spool_walls_width*unit;
spl_h_d=spool_hole_diameter*unit;

//fix
$fn=48*2;
spl_w_r=spl_w_d/2*1;
spl_h_r=spl_h_d/2*1;
fil_r=filament_diameter/2*1;
//spl_pl=3*1;

translate([-spl_w_d/2-3,0,0]) difference()
{
	union()
	{
		cylinder(spl_w_w,spl_w_r,spl_w_r);
		cylinder(spl_w_w+spl_l,spl_h_r+5,spl_h_r+5);
	}

	translate([0,0,-1]) cylinder(spl_l+2,spl_h_r,spl_h_r);
	translate([0,0,spl_w_w]) cylinder(spl_w_w+spl_l+2,spl_h_r+3.1,spl_h_r+3.1);
	translate([0,0,spl_w_w+fil_r]) rotate(90,[1,0,0]) cylinder(spl_h_d+11,fil_r,fil_r,true);
	translate([0,0,spl_w_w+spl_l-fil_r]) rotate(90,[0,1,0]) cylinder(spl_h_d+11,fil_r,fil_r,true);
	difference()
	{
		difference()
		{
			translate([0,0,-1]) cylinder(spl_w_w+2,spl_w_r-spl_w_w*2,spl_w_r-spl_w_w*2);
			for(i=[0:6])
			{
				rotate(i*360/7,[0,0,1]) translate([0,-spl_w_w,-1]) cube([spl_w_r,spl_w_w*2,spl_w_w+2]);
			}
		}
		translate([0,0,-2]) cylinder(spl_w_w+4,spl_h_r+spl_w_w*2+5,spl_h_r+spl_w_w*2+5);
	}
}

translate([spl_w_d/2+3,0,0]) difference()
{
	union()
	{
		cylinder(spl_w_w,spl_w_r,spl_w_r);
		cylinder(spl_w_w+spl_l,spl_h_r+3,spl_h_r+3);
	}

	translate([0,0,-1]) cylinder(spl_l+2,spl_h_r,spl_h_r);
	translate([0,0,spl_w_w]) cylinder(spl_w_w+spl_l+2,spl_h_r+1,spl_h_r+1);
	difference()
	{
		difference()
		{
			translate([0,0,-1]) cylinder(spl_w_w+2,spl_w_r-spl_w_w*2,spl_w_r-spl_w_w*2);
			for(i=[0:6])
			{
				rotate(i*360/7,[0,0,1]) translate([0,-spl_w_w,-1]) cube([spl_w_r,spl_w_w*2,spl_w_w+2]);
			}
		}
		translate([0,0,-2]) cylinder(spl_w_w+4,spl_h_r+spl_w_w*2+5,spl_h_r+spl_w_w*2+5);
	}
}
```


[User]
Okay, so I have a problem and I'm hoping you can help me design something in OpenSCAD. I've got these two side tables, each with three legs, and when placed together, two legs from each table are right next to each other. My cat keeps tipping the tables over, so I want to make a clamp that connects the legs of the two tables together to increase stability.

Basically, I need a clamp that can grab two adjacent table legs. The current tables have legs that are 34mm in diameter. When the two tables are placed next to each other, the distance between the center of these two legs is 84mm. I would like to be able to adjust these leg diameter and center-to-center distance so that the design can be used with different tables. The clamp should have two ring-like features that wrap around the legs, and some sort of connecting piece between the rings. I made something before, but I would like to generalize and improve the design. I used the following parameters in my previous design but I'm hoping you can handle this with parameters:

*   `leg_d`: Diameter of the table legs (currently 34mm)
*   `leg_l`: Center to center distance of the two legs being clamped (currently 84mm)
*   `gap`: Gap for fitting the clamp (currently 0.5mm)
*   `clamp_h`: Height of the clamp (currently 6mm)
*  `clamp_w`: Width of the clamp (currently 6mm)

I'd like the OpenSCAD file to be parametric so I can adjust these values as needed. I want the rings to have a reasonable thickness and to have a "clamping" action so that they grip the legs, so a slight negative tolerance on the ring diameter is okay. Also, I'd like to be able to specify the height and width of the clamp so that I can make the connecting piece stronger if needed.  I'd like to use the build_plate module of the `utils/build_plate.scad` library as well. I think a good way to start is to use a `ring` module to generate the clamp ring as a difference between two cylinders and an intersection with a cube and then use a `legclamp` module to put the two rings together and add a rectangle for the connecting piece.

I think it would also be helpful if you could parameterize a few more things:
*   A clamping gap percentage on the diameter of the ring so the user can control the negative tolerance of the ring inner diameter relative to `leg_d`. This should be a percentage of the leg diameter.
*   A height offset for where to place the center of the clamp relative to the origin. This would allow me to move the clamp up or down on the table legs.

Please make the design customizable and easy to understand. Let me know if you have any questions.

[Assistant]
legclamp.scad:
```
//
//	Filename:	legclamp.scad
//	Author:		Robert H. Morrison
//	Date:		24 Jan 2013
//
//	A clamp to hold two 3 wheeled tables together to make them stable.
//

use <utils/build_plate.scad>

//Diameter of the Leg
leg_d = 34;
//Length of the outside of two legs
leg_l = 84;
//Gap to use for fitting
gap = 0.5;
//Height of the clamp
clamp_h = 6;//[2:10]
//Width of the clamp
clamp_w = 6;//[2:10]

//for display only, doesn't contribute to final object
build_plate_selector = 0; //[0:Replicator 2,1: Replicator,2:Thingomatic,3:Manual]
//when Build Plate Selector is set to "manual" this controls the build plate x dimension
build_plate_manual_x = 100; //[100:400]
//when Build Plate Selector is set to "manual" this controls the build plate y dimension
build_plate_manual_y = 100; //[100:400]

build_plate(build_plate_selector,build_plate_manual_x,build_plate_manual_y);

x = leg_l - leg_d;

module ring(r,w) {
	rotate([0,0,-45])
		intersection() {
			difference() {
				cylinder(clamp_h, r+w, r+w, true, $fn=100);
				cylinder(clamp_h+1, r+gap, r+gap, true, $fn=100);
			}
			translate([0,0,-(clamp_h+1)/2]) {
				cube([r+w+1,r+w+1,clamp_h+1]);
				rotate([0,0,45])
					cube([r+w+1,r+w+1,clamp_h+1]);
			}
		}
}

module legclamp() {
	translate([0,0,clamp_h/2]) {
		translate([x/2,0,0])
			ring(leg_d/2,clamp_w);
		translate([-x/2,0,0])
			rotate([0,180,0])
				ring(leg_d/2,clamp_w);
		translate([0,(leg_d+clamp_w+gap)/2,0])
			cube([x+.002,clamp_w-gap,clamp_h], true);
	}
}

legclamp();

```


[User]
Okay, I'm looking for an OpenSCAD design for a customizable thumb knob. I've seen a few out there, but I want one that can handle different types of fasteners: nuts, hex head cap screws (HHCS), and socket head cap screws (SHCS). It should be parametric, so I can easily change things like size and grip features.

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

**Core Functionality:**

*   **Fastener Type:** The design needs to work with three different fastener types:
    *   **Nuts:** The knob should have an appropriate hex cutout to fit a standard nut.
    *   **Hex Head Cap Screws (HHCS):** It should accommodate the hex head of an HHCS.
    *   **Socket Head Cap Screws (SHCS):** The knob should have a cylindrical pocket to fit the head of an SHCS.
*   **Metric Thread Sizes:** I need it to be designed for standard metric thread sizes. I'll need a lookup table for this. At a minimum, this should be M1.6, M2, M2.5, M3, M4, M5, M6, M8, M10, M12, M14, M16, and M20.
*   **Pocket Type:** I'd like three options for the pocket that forms the grip.
    *   **Constant Wall Thickness:** The pocket would maintain a consistent wall thickness around the entire circumference.
    *   **Solid:** The knob would be solid with no pocket (or, really, a very shallow pocket for a visual reference of the center).
    *   **Circular Cut-Out:** The pocket would be a circular void.
*   **Customizable Parameters:**
    *   **Knob Diameter:** The overall diameter of the thumb knob.
    *   **Knob Thickness/Height:** The overall height or thickness of the knob.
    *   **Wall Thickness:** The thickness of the knob walls (around the pocket).
    *   **Number of Rosettes (Grip Cutouts):** The number of finger grips/cutouts on the side of the knob (I'm thinking a circular cutout that extends to the edge with a variable radius, but I'm open to different methods that work well).
    *   **Rosette Radius:** The radius of the finger grip cutouts.
    *  **Rosette Offset:** The distance the center of the rosette cutouts is from the edge of the knob (allows for larger radii).
    *   **Chamfer Size:** The size of the bevel at the top and bottom edges of the knob.
    *   **Clearance:** A small clearance value for the fasteners to ensure a good fit.

**Specifics:**

*   **Lookup Tables:** I'd like to include lookup tables for the different fastener dimensions. For nuts and hex head cap screws, this would be hex width and hex height. For socket head cap screws, this would be the head diameter. I also need the thread diameter for internal cutouts. The lookup tables I'll need include:
    *   Thread outer diameter
    *   Hex width
    *   Hex Height
    *   Socket head cap screw diameter

*   **OpenSCAD Libraries:** I'm not expecting any extra OpenSCAD libraries, but if you have a good reason for including one, I'm willing to consider it.

**Output:**

*   A single `.scad` file should be sufficient.
*   The script should be well-commented and easy to understand.

I think this covers everything. Let me know if you have any questions. I'm excited to see what you come up with!

[Assistant]
Thumb_Knob_Custom.scad:
```
/*
Universal Thumbnut/Socket Knob Design
By: Harrison Fast (2013)

This is a parametric script for a thumb knob which can be used on either a nut, hex head cap screw, or socket head cap screw.
Options include:
unit of measure (metric, imperial)
thread size []
pocket type (Constant_Wall_Thickness, Solid, Circular)
knob diameter
number of rosettes (fingers/cutouts)
size and position of rosette
wall thickness
top wall thickness

Should work in the Thingiverse Customizer

*/

//****Variables - To be Set****\\
//CUSTOMIZER VARIABLES

//What's This Knob For?
Knob_Type=3;//[1:Nut,2:Hex Head Screw,3:Socket Head Screw]

//What Size Nut or Screw?
Thread_Size=6; //[0:M1.6,1:M2,2:M2.5,3:M3,4:M4,5:M5,6:M6,7:M8,8:M10,9:M12,10:M14,11:M16,12:M20]

//What Kind of Pocket Do You Want?
Knob_Fill=1;//[1:Constant Wall Thickness,2:Solid,3:Circular Cut-Out]

//How Big Should The Knob Be?
Knob_Diameter = 40;
knob_r = Knob_Diameter/2;

//How Thick Should the Grip Be? (Overall Height)
Knob_Thickness=15;
knob_t=Knob_Thickness*1;

//How Thick Should The Walls Be?
Wall_Thickness=3;

//How Many Prongs Should It Have?
Number_of_Rosettes=6; //[1:16]

//How Big Should The Finger Dents Be?
Rosette_Radius=6;

//How Far Should The Finger Dents be From The Knob Circumference? (This lets you use larger radii by moving the center of the cut-out cylinder away from the center of the knob)
Rosette_Offset = 3;

//How Big Should the Bevel Be?
Chamfer_Size=1;
r_cham = Chamfer_Size*1; //Too lazy to change the proper names to Chamfer_Size

//How Much Clearance Do You Want? 0 probably won't work.
Clearance=.25; //[0:.125:1];

//CUSTOMIZER VARIABLES END

//$fa=6;

echo(knob_t);
knob_hex(); //main function call

//****MODULES***\\

module hex_trude(hex_width,hex_height) //makes a hexagonal prism at hex_width
	{
		s = hex_width/1.732;
		l_x=s/2;
		l_y=.866*s;
		a_1 = [ [s,0],[l_x,-l_y],[-l_x,-l_y],[-s,0],[-l_x,l_y],[l_x,l_y]];
		b=[0:5];
		linear_extrude (height = hex_height) polygon(a_1,b);
	}

module pocket(hex_width,hex_height)
{
	if(Knob_Fill==1){
		difference() {
			 translate([0,0,Wall_Thickness]) {cylinder(h=hex_height, r=knob_r-Wall_Thickness);} //wall offset
				for(i=[0:Number_of_Rosettes-1]) {
					rotate([0,0,360*i/Number_of_Rosettes])
						translate([knob_r+Rosette_Offset,0,0]) {
							cylinder(h = Wall_Thickness+hex_height, r = Rosette_Radius+Wall_Thickness); } //wall offset rosette
								}
	}//endif
					}

	else if(Knob_Fill==2){
	}//endif

	else if(Knob_Fill==3) {
		translate([0,0,Wall_Thickness]) {
			cylinder(h=hex_height,r=knob_r-Wall_Thickness-Rosette_Radius+Rosette_Offset);
						}
	}//endif

} //end module pocket()

module knobby_base_parts(knob_r, knob_h, rA, rB)
{
	difference()
	{
		cylinder(h=knob_h,r1=knob_r-rA,r2=knob_r-rB);
		for(i=[0:Number_of_Rosettes]){
			rotate(360*i/Number_of_Rosettes,[0,0,1]) translate([knob_r+Rosette_Offset,0,-0.05])
				cylinder(h=knob_h+.1,r1=Rosette_Radius+rA,r2=Rosette_Radius+rB);
		} //end if
	} //end difference
} //end knobby_base_parts

module knobby_base(hex_width,hex_height,r_cham)
{
	difference(){
			union() {
				knobby_base_parts(knob_r,r_cham,r_cham,0);
				if(hex_height<Wall_Thickness){
					union() {
						translate([0,0,r_cham]) knobby_base_parts(knob_r,Wall_Thickness-2*r_cham,0,0);
						translate([0,0,Wall_Thickness]) knobby_base_parts(knob_r, r_cham,0,r_cham);}}

				else {translate([0,0,r_cham]) knobby_base_parts(knob_r,hex_height-2*r_cham,0,0);
					union() {
						translate([0,0,r_cham]) knobby_base_parts(knob_r,hex_height-2*r_cham,0,0);
						translate([0,0,hex_height-r_cham]) knobby_base_parts(knob_r, r_cham,0,r_cham); }}
				} //end union
			pocket(hex_width,hex_height+1);
					} //end difference
} //end knobby_base

module make_knob(hex_width,hex_height,r_cham)
{
	if(Knob_Type==1){
	difference(){
			union(){
			rotate(0,[0,0,1]) {
			difference(){
				knobby_base(hex_width,knob_t,r_cham);
				translate([0,0,Wall_Thickness])hex_trude(hex_width+.25,hex_height+1+knob_t);
				}}
			translate([0,0,Wall_Thickness]) {
				difference() {
					hex_trude(hex_width+Wall_Thickness*2,hex_height);
					hex_trude(hex_width+.25,hex_height+.1);}
					}}
		translate([0,0,-.1]) cylinder(h=Wall_Thickness+hex_height+.2, r = Thread_Size/2+.25);
	 } 	//end Difference
	} //end if

	else if(Knob_Type==2) {
	difference() {
		union() {
			knobby_base(hex_width,knob_t,r_cham);
			cylinder(h=hex_height+Wall_Thickness, r=hex_width/2+Wall_Thickness);
			} //end union
		translate([0,0,-.05]) hex_trude(hex_width+.25,hex_height);
		translate([0,0,-.5]) cylinder(h=hex_height+Wall_Thickness+1+knob_t, r=thread_d[Thread_Size]/2+.125);
		}//end difference
	}//end if

	else if(Knob_Type==3) {
	difference(){
		union() {
			knobby_base(hex_width,knob_t,r_cham);
			cylinder(h=hex_height+Wall_Thickness, r=hex_width/2+Wall_Thickness);
		}//end union
			translate([0,0,-.05]) cylinder(h=hex_height+Knob_Thickness, r=hex_height/2+.125);
			translate([0,0,-.05]) cylinder(h=hex_height, r=hex_width/2);
	} //end difference
		} //end if
} //end module make_knob_hex

module knob_hex(){
	if (Knob_Type==1 || 2){
		make_knob(hex_w_table[Thread_Size],hex_h_table[Thread_Size],r_cham);
		}//end if
	else if (Knob_Type==3){
		make_knob(shcs_d_table[Thread_Size],thread_d[Thread_Size],r_cham);
} //end_if
} //end knob_hex

//****END KNOB BUILDING****\\

//****LOOKUP TABLES****\\

//----Lookup----\\

//----Thread Outer Diameter----\\\\
thread_d=[1.6,2,2.5,3,4,5,6,8,10,12,14,16,20,24];

//----Hex Width----\\
hex_w_table=[3.2,4,5,5.5,7,8,10,13,16,18,21,24,30,36];

//----Hex Height----\\
hex_h_table=[1.3,1.6,2,2.4,3.2,4.7,5.2,6.8,8.4,10.8,12.8,14.8,18,21.5];

//----Hex Head Height----\\
hex_head_height=[1.3,2,2.1,2.1,2.9,3.5,4.1,5.4,6.5,7.6,8.8,10,12.5,15];

//----SHCS Diameter----\\
shcs_d_table=[2.5,3.8,4.2,5.5,7,8.5,10,13,16,18,21,24,27,30];
//----SHCS Height = Thread Size!---\\

```


[User]
Okay, I'd like to design a customizable bracelet using OpenSCAD. I've got some ideas for how I want it to work.

Basically, I want a bracelet made of interconnected links. I should be able to choose whether I want a full chain bracelet or just a single link. If it's a chain, I need to be able to set the diameter of the bracelet, and the links will be generated around that circle. I also need to control the length of each individual link. There should also be small "eyelet" connectors at the ends of each link. I'll need to control the size of these too.

For the links themselves, I'd like to choose the width. And I'd like to have a few different styles for how the links are connected. I'm thinking I'll call them styles A, B, and C. Style A should be fairly simple, it'll be a bunch of cylinders connecting the top and bottom "rails" of each link. I'll want to set how many cylinders there are. Style B will be more complex. It will consist of a series of rings at different points along the link, I'll want to be able to control the shape of the rings (number of sides), the density of the rings along the link and how thick each ring is. I should also be able to add some random spin to the individual rings to make it more organic. I will also need to be able to control the random spin on each of the three axes of the rotation. I'd like to be able to skew each ring along each axis as well, and control the scale of randomness for this. Finally style C should be a bit like a twisted bar, that bulges in the center. I should be able to control the bulge and the total amount of twist.

I'd also like to include an option to randomly choose between these styles, if I make a chain of links.

It would also be great if I could add or remove a few links to make sure it all connects properly. The links should all be the same length and the eyelets should be located in the same place. I also want the ability to combine connector types if I choose.

So to summarize, here are the parameters I'd like to control in OpenSCAD:

*   **`chain`**: Boolean, to generate a full bracelet or single link.
*   **`linkLength`**: Length of each link.
*   **`diameter`**: Diameter of the bracelet (if chain is true).
*   **`eyeletSize`**: Size of the eyelet connectors.
*   **`linkAdjust`**: Number of links to add/remove for fit.
*   **`linkWidth`**: Width of the links.
*   **`connectType`**: String, "A", "B", or "C", for the connector style.
*   **`connectCombine`**: Boolean, for if the different connector styles should combine
*    **`useRandomLinks`**: Boolean, for if the link type should be randomly selected
*   **`numConnectorsA`**: Number of cylinders for connector type A.
*   **`numberOfSidesB`**: Number of sides for the shape used in connector type B.
*   **`randomSpinB`**: Boolean, to add random spin to shapes in connector type B.
*   **`densityB`**: Number of sections for the rings in connector type B, less if more.
*   **`thicknessB`**: Thickness of the sections in connector type B.
*    **`randomRotateOnB`**: Boolean, for if there should be random rotation.
*    **`randomSkewOnB`**: Boolean, for if there should be skew on an axis.
*    **`randomScaleSkewB`**: The scale of the skew
*   **`centerExpandC`**: Amount of bulge for connector type C.
*   **`twistC`**: Total twist for connector type C.

I think that should be everything. Let me know if you have any questions. I'm not planning to use any special OpenSCAD libraries.

[Assistant]
customizable_bracelet_v01.scad:
```
//Constants
//hidden PI
//PI = 3.14159;

//CUSTOMIZER VARIABLES

//Generate Chain or Single Link
chain = true; // [true, false]

//Length Of Each Link
linkLength = 15;

//Diameter of the total item.
diameter = 62;

//Size of the link connectors
eyeletSize = 2;

//Add or remove links to make sure that the links connect.
linkAdjust = 4;

//Width of Links.
linkWidth = 4;

//Style of links.
connectType = "A"; // [A, B, C]

connectCombine = false;

useRandomLinks = false;

//Connector Type A Controls.
numConnectorsA = 2; // [2 : 10]

//Connector Type B Controls.
//Number of sides of the shapes.
numberOfSidesB = 5;

//Add randomness to the shapes
randomSpinB = true; //[true, false]

//How many sections, Less if more.
densityB = 2;

//This of the sections.
thicknessB = 1;

//Randomness on y axis of connector.
randomRotateOnB = 1; //[1: true, 0:false]

//Randomness on x axis of connector.
randomSkewOnB = 1; //[1: true, 0:false]

//Scale randomness of the skew.
randomScaleSkewB = 15;

//Connector Type C controls.

//Cause a bulge in the connector.
centerExpandC = 2;

//Total amount of twist.
twistC = 360;

//CUSTOMIZER VARIABLES END

module ring(height, thickness, eyeletSize, res=40){
	difference(){
		cylinder(h=height, r1=eyeletSize, r2=eyeletSize, center=true, $fn=res);
		cylinder(h=height*2, r1=eyeletSize-thickness, r2=eyeletSize-thickness, center=true, $fn=res);
	}

}

module link(linkLength, linkType = 0){

	union(){
		rotate([90, 0, 45]) translate([ 0, linkLength/2+eyeletSize, 0]) {
			ring(1, 0.5, eyeletSize);

		}

		rotate([-90, 0, -45]) translate([ 0, linkLength/2+eyeletSize, 0]) {
			ring(1, 0.5, eyeletSize);
		}

		translate([0, 0, (linkLength)/2]) cube(size=[linkWidth, 1, 1], center=true);

		translate([0, 0, -(linkLength)/2]) cube(size=[linkWidth, 1, 1], center=true);

		if (connectCombine == false){

			if(linkType == "A"){
				connectA();
			}
			if(linkType == "B"){
				connectB();
			}
			if(linkType == "C"){
				connectC();
			}
		}else{
			connectA();
			connectB();
		}

	}

}

module connectA(){

		for (i = [0: numConnectorsA-1]){

			translate([((linkWidth/(numConnectorsA-1))*i) - linkWidth/2, 0, 0]) cylinder(h=(linkLength)+1, r1=0.5, r2=0.5, center=true, $fn=20);
		}
}

module connectB(){

	random_vect = rands(0,360,linkLength);
	random_vect2 = rands(-45,45,linkLength);
	difference(){
		union(){
			for(i = [0 : densityB : linkLength ]){
				if (randomSpinB == true){
					rotate([90, 0, 0]) translate([0,i-((linkLength)/2) , 0]) rotate([random_vect2[i]*randomSkewOnB*(randomScaleSkewB/100), random_vect2[i]*randomSkewOnB*(randomScaleSkewB/100), random_vect[i]*randomRotateOnB]) ring(1, thicknessB, linkWidth/2, numberOfSidesB);
				} else {
					rotate([90, 0, 0]) translate([0, i-(linkLength/2), 0]) ring(1, thicknessB, linkWidth/2, numberOfSidesB);
				}
			}

		}

	translate([0, 0, linkLength/2+5]) cube(size=[linkWidth, 10, 10], center=true);
	translate([0, 0, -linkLength/2-5]) cube(size=[linkWidth, 10, 10], center=true);

	}

}

module connectC(){

		function getLookUp(p) = lookup(p, [[0, 1], [linkLength/2, centerExpandC], [linkLength, 1]]);

		for(i = [0 : linkLength]){

			translate([0, 0, (i-((linkLength)/2))]) rotate([0, 0, twistC*(i/(linkLength*2))]) cube(size=[linkWidth*getLookUp(i), 1 , 1], center=true);
		}
}

numOfLinks = ceil((diameter*PI)/(linkLength+eyeletSize)/2)+linkAdjust;

randomLinks = rands(0, 1, ceil((diameter*PI)/(linkLength+eyeletSize)/2)+linkAdjust);

if (chain){

for (i = [0 : numOfLinks]){

	rotate([0, 0, 360/numOfLinks*i]){
		if(useRandomLinks == false){
			rotate([90, 0, 0]) translate([diameter/2, 0, 0]) link(linkLength, connectType);

		} else {

			rotate([90, 0, 0]) translate([diameter/2, 0, 0]) link(linkLength, round(randomLinks[i]));
		}

	}

}

}else{

	rotate([90, 0, 0]) link(linkLength, connectType);
}

```


[User]
Okay, I'd like to create a customizable cube using OpenSCAD. I've started with a basic file, but I want to make it more flexible and user-friendly.

Here's what I'm aiming for:

**Core Functionality:**

*   **Cube Dimensions:** I need a single parameter, `cube_dimensions`, to control the size of the cube. The cube should always be a perfect cube (all sides equal), and this parameter should control the length of each side. I'd like this to be a slider in the customizer, with a range from 1mm to 10mm, ideally in 0.1mm increments.
*   **Build Plate Display:** I'm already using the `utils/build_plate.scad` library, which I'd like to keep. I want the ability to select from a predefined list of build plates (like Replicator 2, Replicator, Thingomatic) or to set manual dimensions with two parameters:
    *   `build_plate_selector` should be a dropdown with the options "Replicator 2", "Replicator", "Thingomatic", and "Manual". This will drive the build plate display.
    *   `build_plate_manual_x` and `build_plate_manual_y` should be sliders visible only when "Manual" is selected in the `build_plate_selector` dropdown. These should control the X and Y dimensions of the build plate, respectively. They should have a range of 100mm to 400mm each.

**User Interface:**

*   I'd like clear labels for each of these parameters in the Customizer.
*   The `build_plate_manual_x` and `build_plate_manual_y` sliders should only be visible when the `build_plate_selector` is set to "Manual".
*   The initial view in the preview should be the 'south', 'tilt', and 'top' views.

**Libraries:**

*   I'm using the `utils/build_plate.scad` library for the build plate display, so I need to keep that dependency intact.

**General Requests:**

*   Could you make sure the code is well-formatted and easy to read?
*   I'd prefer the most concise and efficient way to achieve this in OpenSCAD.

Essentially, I want to easily adjust the size of a cube and also customize and display a build plate in the viewer. Can you please provide the updated .scad file that does this?

[Assistant]
cube_customizer.scad:
```
use <utils/build_plate.scad>
// preview[view,south, tilt,top]
// variables
// (cube dimensions)
cube_dimensions = 1;//[1.1,1.2,1.3,1.4,1.5,1.6,1.7,1.8,1.9,2,2.1,2.2,2.3,2.4,2.5,2.6,2.7,2.8,2.9,3,3.1,3.2,3.3,3.4,3.5,3.6,3.7,3.8,3.9,4,4.1,4.2,4.3,4.4,4.5,4.6,4.7,4.8,4.9,5,5.1,5.2,5.3,5.4,5.5,5.6,5.7,5.8,5.9,6,6.1,6.2,6.3,6.4,6.5,6.6,6.7,6.8,6.9,7,7.1,7.2,7.3,7.4,7.5,7.6,7.7,7.8,7.9,8,8.1,8.2,8.3,8.4,8.5,8.6,8.7,8.8,8.9,9,9.1,9.2,9.3,9.4,9.5,9.6,9.7,9.8,9.9,10]
//for display only, doesn't contribute to final object
build_plate_selector = 3; //[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 = 200; //[100:400]

//when Build Plate Selector is set to "manual" this controls the build plate y dimension

build_plate_manual_y = 200; //[100:400]

build_plate(build_plate_selector,build_plate_manual_x,build_plate_manual_y);

cube ([cube_dimensions,cube_dimensions,cube_dimensions]);

```


[User]
Okay, I'd like to design a customizable foot for electronics projects, specifically one that will hold a #6 bolt and a #6 square nut. I already have a basic version, but I need it to be parametric, and I'd like it to use a library for added flexibility in the future. I've attached the current SCAD file as `foot-round-custom.scad` for reference.

Here are the key parameters I need to control:

*   **Units:** I need to be able to switch between millimeters, inches, and mils.
*   **Bolt Hole Diameter:**  This should be customizable, as I might need to use a different screw size in the future. I'm currently targeting a clearance hole for a #6 bolt, which is about 3.7mm, but I need to adjust this.
*   **Bolt Hole Depth:** How deep the hole for the bolt goes. This needs to be adjustable to ensure the bolt engages the nut correctly.
*   **Nut Size:** The size of the square nut (currently for a #6 nut).
*   **Total Foot Height:** How tall the foot will be.

I'd like the foot to be cylindrical, with a hole for the bolt going most of the way through, and then a square recess for the nut at the top. The square nut recess should be sized exactly for the selected nut, and the bolt hole diameter should also be adjustable, with an option to set that in mm, inches, or mils.

Ideally, the new design should use the BOSL2 library, if possible, to potentially use more of its features in the future for other projects. I need to maintain the basic structure of a cylindrical foot, with the bolt hole and nut recess as in `foot-round-custom.scad` . I also need to ensure that the nut hole is cut after the bolt hole, so the cut is clean.

Can you generate the OpenSCAD code for me?

[Assistant]
foot-round-custom.scad:
```
// Generic foot with #6 bolt and #6 square nut
// Al Williams (al.williams@awce.com or @awce_com)
// Hacked to fit with Customizer template

//	Uncomment the library/libraries of your choice to include them

//CUSTOMIZER VARIABLES

// Units for all custom variables
Units=1;  // [1:mm, 25.4:inches, 0.254:mils]
// Diameter of screw holes, 3.7mm = #6 clearance hole.  if your printer is a little "tight" you might open it up a bit
Bolt_Size=3.7;
boltsize=Bolt_Size*Units;
// How deep do you want the bolt hole? Should be slightly shorter than the bolt so the nut can engage
Bolt_Depth=12.2;
boltdepth=Bolt_Depth*Units;
// Size of the square nut (example #6 nut is 5/16 inch which is 7.9375 mm)
Nut_Size=7.9375;
nutsize=Nut_Size*Units;
// Foot height
Total_Height=40;
totalh=Total_Height*Units;

totalw=boltsize*4;    // diameter not radius!

// the .1 fudge factor here makes sure
// there is a clean cut between the bolt hole
// and the nut hole
nutdepth=(totalh-boltdepth)+0.1;

//CUSTOMIZER VARIABLES END

$fn=55+0; // # of arcs in a circle -- higher is better but runs longer

// Some measurements are in inches (original)
in2mm=25.4+0;

// mounting bolt hole
module bolthole()
{
// the .02 makes it stretch a little past the edge
// so the cut is clean
  translate([0,0,totalh-boltdepth])
    cylinder(h=boltdepth+.02,r=boltsize/2);

}

module nuthole()
{
// The .02 makes it stretch a little past the edge
// so the cut is clean
translate([0,0,nutdepth/2])
   {
     cube(size=[nutsize,nutsize, nutdepth+.02],center=true);
    }
}

// Here we go (translate and rotate so big end is up for printing)
translate([0,0,totalh])
rotate ([180,0,0]) difference () {
    cylinder(r=totalw/2,h=totalh,center=false);
    bolthole();
    nuthole();
}

```


[User]
Okay, I need to design a test print for my 3D printer, specifically to dial in the horizontal wall thickness. I'm using an Afinia H480 and have some Octave Gray Blue ABS filament. I've been using a modified version of a design I found online, but I want something more flexible and parameterized that I can easily adjust.

Basically, I want to create a series of small wall samples, each with a slightly increasing thickness. These samples should be arranged side-by-side. Each sample should have a consistent length, but the length should also be parameterizable.

Here are the key parameters I need:

*   **Start Thickness:** The thickness of the very first sample (e.g., 0mm).
*   **Thickness Increment:** The amount by which the thickness increases between each subsequent sample (e.g., 0.05mm).
*   **End Thickness:** The maximum thickness of the last sample (e.g., 1mm).
*   **Sample Width:** The width of each individual wall sample (e.g., 4mm).
*   **Sample Length:** The length of each individual wall sample (e.g., 6mm).

I also want to add some visual indicators so I can easily tell which sample is which. I want to make it so that every 10th sample has a larger cylindrical hole through it, and then every even sample (but not every tenth) has a smaller cylindrical hole through it. The cylinders should not be going all the way through each sample, but should go some distance (e.g. 3 * maximum thickness or something) to make them easily visible.

I'd like the design to be parametric using OpenSCAD, so I can easily adjust all those parameters. I want to define each of those parameters as variables at the top, so I don't have to go digging through the code to change them. Can you create a parametric OpenSCAD file that does this?  I'm not using any special libraries right now, so I don't have any dependencies I need you to include.

[Assistant]
horizontal_wall_test_print_v1-0.scad:
```

// start thickness
_1_start = 0.0;

// thickness increment between samples
_2_increment = 0.05;

// end thickness
_3_end = 1;

// width of each sample
_4_width = 4; // [1:10]

// minimum height of each sample (varies from
_5_height = 6; // [1:50]

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

module layerTest(start, increment, end, width, length) {
	count = round((end-start)/increment)+1;
	radius = width/3;
	eps = 0.1;
	union() {
		for (index = [0:count-1]) {
			assign (h = start + increment * index) {
				echo(h);
				if (h > 0) {
					translate([index * width,0,0]) {
						difference() {
							cube(size=[width+eps, length + (index-1)%10, h]);

							if (index%10 == 0) {
								translate([width/2,0,0]) {
									cylinder(r=radius, h=end*3, center=true, $fn=30);
								}
							} else if (index%2 == 0) {
								translate([width/2,0,0]) {
									cylinder(r=radius/2, h=end*3, center=true, $fn=30);
								}
							}
						}
					}
				}
			}
		}
	}

}

layerTest(_1_start,_2_increment,_3_end,_4_width,_5_height);
```


[User]
Okay, I'm looking to design a customizable LED lantern and I'd like to use OpenSCAD. I have a basic design concept that I've modeled before, but I want to make it more parametric and easier to adjust for different sizes and purposes.

Here's what I'm envisioning:

The lantern should consist of three main parts: a top, a base, and a window section. The window can be either flat or cylindrical. I'd like to be able to choose which of these parts I'm creating, using a variable to specify either "Top", "Base", "Flat Window" or "Round Window."

**Key Parameters:**

*   **Lantern Diameter:** The diameter of the lantern at the window section (where the window inserts). I need to be able to set this (e.g., 40mm), and it should affect the size of the other parts appropriately.
*   **Top Height:** The height of the top part of the lantern.
*   **Window Height:** The height of the window section (both flat and cylindrical).
*   **Base Height:** The height of the base part of the lantern.
*   **Window Thickness:** The thickness of the window material. I want this to be very thin, especially for printing, and perhaps configurable to be a single layer.
*   **Window Gap:** A small gap between the window and the top/base for insertion.
*   **Notch Width:** The width of a notch that helps to hold the flat window in place. If I want a round window, this value should effectively be 0.
*   **LED Clip:** A boolean option (Yes/No) to add an integrated LED clip to the base.

**Desired Features**

*   **Top:** The top piece should be a cylinder with an inset to hold the window. The inset should be adjustable.
*   **Base:** The base should have a similar inset as the top for holding the window, as well as the option to include the LED clip. This clip is for a small, cylindrical LED, and should have guides for wires. The bottom of the base should also be a cylinder that is wider than the sides.
*   **Flat Window:** The flat window should be a rectangle, with a small seam/tab on each side for assembly.
*   **Round Window:** The round window should be a cylinder with a given thickness.

**Specific Requirements:**

*   I'd like to use `build_plate` from a `utils/build_plate.scad` file that I have. This is mostly for visualization purposes. Please ensure that this is at the bottom of the generated OpenSCAD code. I already have the `build_plate` module, so you don't need to include that in the response.
*   The code should be well-commented.
*   I need the model to be easily customizable through the use of variables, including descriptive names for the variables (e.g., `_1_type`, `_2_lanternDiameter`, etc.).

Could you generate the OpenSCAD code for this design? I'm looking for a clean and parametric design that I can easily modify for different sizes and configurations.

[Assistant]
round_lantern_v1-0.scad:
```
use <utils/build_plate.scad>;

// Type of part to make
_1_type = "Top"; //[Base, Flat Window, Round Window, Top]

// Diameter of the lantern at the window
_2_lanternDiameter = 40; //[12:120]

// Height of the top lantern part
_3_topHeight = 4; //[2:12]

// Height of the window part of the lantern
_4_windowHeight = 60; //[10:120]

// Height of the bottom lantern part
_5_baseHeight = 6; //[2:24]

// Thickness of the window (set it to print one layer for maximum transparency)
_6_windowThickness = 0.2;

// Circular gap in the top and base for the window insert
_7_windowGap = 0.5;

// Size of the notch used to hold flat windows (set to 0 for round windows)
_8_notchWidth = 2.4;

// Add optional led holder to the base of the lantern
_9_addLedClip = 0; //[0:No, 1:Yes]

module ledSide(width, offset) {
	thickness = 1.4;
	radius = 4;
	height = 10;
	eps = 0.1;
	wireDepth = 0.5;
	yoffset = width/2 - radius;

	translate([offset,0,0])
	translate([thickness,0,0])
	rotate(a=[0,-2.5,0])
	translate([-thickness,0,0]) {

		difference() {
			union() {
				hull() {
					translate([0,-9,0]) {
						cube(size=[thickness, width, 1]);
					}

					for(y=[-yoffset, yoffset]) {
						translate([0,y,height - radius]) {
							rotate(a=[0,90,0]) {
								cylinder(r=radius,h=thickness);
							}
						}
					}
				}

				//support
				translate([thickness,0,0])
				scale(v=[1,1,2])
				difference() {
					translate([0,0,-0.1])
					rotate([0,45,0]) {
						cube(size=[1.0,width,1.0], center=true);
					}
					translate([0,0,-1.1]) {
						cube(size=[2.0,width,2.0], center=true);
					}
				}
			}

			// cut wire guides
			for(y=[0:2.0:6]) {
				for(flip=[-1,1]) {
					translate([-eps, -0.3 + y * flip, -eps]) {
						cube(size=[wireDepth+eps, 0.8, height + 2*eps]);
					}
				}
			}

			// lower cutout
			hull() {
				cube(size=[wireDepth*2, width+eps, 8], center=true);
				cube(size=[0.001, width+eps, 10], center=true);
			}

			// bevel top
			translate([0,0,height])
			scale(v=[1,1,3])
			rotate([0,45,0]) {
				cube(size=[0.8,width+eps,0.8], center=true);
			}

		}
	}
}

module addLedClip() {
	width = 18;
	gap=3.5;

	ledSide(width, gap/2);
	mirror() {
		ledSide(width, gap/2);
	}
}

module makeTop(diameter, height, windowGap, notchWidth, windowInset) {
	inset = min(windowInset, height-1.0);
	wallThickness = 1.1;
	radius1 = diameter/2 - windowGap/2;
	radius2 = radius1 + windowGap;
	radius3 = radius2 + wallThickness;
	eps = 0.1;
	translate([0,0,height]) {
		difference() {
			translate([0,0,-height]) {
				difference() {
					cylinder(r=radius3, h=height);
					translate([0,0,-eps]) {
						cylinder(r=radius1-wallThickness, h=height + 2*eps);
					}
				}
			}
			translate([0,0,-inset]) {
				difference() {
					cylinder(r=radius2, h=inset+eps);
					translate([0,0,-eps]) {
						cylinder(r=radius1, h=inset + 3*eps);
					}
				}
			}
			if (notchWidth > 0) {
				translate([-notchWidth/2,radius1-wallThickness*2,-inset]) {
					cube(size=[notchWidth,wallThickness*2,inset+eps], center=false);
				}
			}
		}
	}
}

module makeBase(diameter, height, windowGap, notchWidth, windowInset, clip) {
	radius = diameter/2 + windowGap/2 + 1.0;
	baseThickness = 1.0;
	union() {
		makeTop(diameter, height, windowGap, notchWidth, windowInset);
		cylinder(r=radius, h=baseThickness);
		if (clip == 1) {
			translate([0,0,baseThickness]) {
				addLedClip();
			}
		}
	}
}

module makeFlatWindow(diameter, height, thickness) {
	width = diameter * 3.14159265359;
	seamWidth = 1.0;
	seamDepth = 1.5;
	xoffset = -width/2 + seamWidth/2;
	union() {
		cube(size=[width, height, thickness], center=true);
		for (x = [-xoffset,xoffset]) {
			translate([x,0,seamDepth/2]) {
				cube(size=[seamWidth, height, seamDepth], center=true);

			}
		}
	}
}

module makeRoundWindow(diameter, height, thickness) {
	radius = diameter/2;
	eps = 0.1;
	difference() {
		cylinder(r=radius + thickness/2, h=height);
		translate([0,0,-eps]) {
			cylinder(r=radius - thickness/2, h=height + 2*eps);
		}
	}
}

module run($fn=180) {
	if (_1_type == "Top") {
		makeTop(_2_lanternDiameter, _3_topHeight, _7_windowGap, _8_notchWidth, 4.0);
	} else if (_1_type == "Flat Window") {
		makeFlatWindow(_2_lanternDiameter, _4_windowHeight, _6_windowThickness);
	} else if (_1_type == "Round Window") {
		makeRoundWindow(_2_lanternDiameter, _4_windowHeight, _6_windowThickness);
	} else {
		makeBase(_2_lanternDiameter, _5_baseHeight, _7_windowGap, _8_notchWidth, 4.0, _9_addLedClip);
	}
}

build_plate(3,140,140);
run();
```


[User]
Okay, I'd like to get a parametric OpenSCAD file for a tri-glide buckle with an integrated eyelet. I'm using the existing tri-glide design from my current SCAD file as a starting point, but I want to make it fully configurable and more robust.

Here's what I'm looking for:

**Core Tri-Glide Functionality (Based on the provided SCAD):**

*   **Webbing Width:**  The primary parameter should be the width of the webbing that passes through the tri-glide (e.g., 1 inch, which is 25.4mm). I need to be able to specify this as a parameter. Let's call it `webbingWidth`.
*   **Webbing Gap:** The space between the center bar and the outer edges where the webbing passes. This should also be a parameter, `webbingGap`.
*   **Edge Thickness:** The thickness of the material forming the outer edges of the tri-glide. This is a parameter, `edgeThickness`.
*   **Center Thickness:** The thickness of the center bar. Another parameter, `centerThickness`.
*   **Height:** The overall height of the tri-glide, or rather, how much the tri-glide is extruded in the Z-axis. I need this to be a parameter, `triGlideHeight`.
*   **Corner Rounding:** I want to specify a percentage for how rounded the corners are, which is a percentage where 0% is no rounding and 100% is fully rounded. This should also be a parameter. `cornerRounding`.
*   **Corner Breakage:** How much to break off the corners, to prevent sharp edges. This needs to be a parameter, `cornerBreakage`.

**Eyelet:**

*   **Eyelet Diameter:** I need an eyelet feature for attaching rings, hooks, or ropes. The diameter of the hole through the eyelet should be a parameter, `eyeletDiameter`.
*   **Eyelet Rim Thickness:** The thickness of the rim around the eyelet opening, this needs to be a parameter as well, `eyeletRimThickness`.
*   **Eyelet Placement:** The eyelet should be centered on the top of the tri-glide.

**General Requirements:**

*   **Parametric:** All of the dimensions specified above need to be controlled by parameters. It should be easy to modify the code to change any of these values.
*   **Clean Code:** The code should be well-organized and easy to read. Please use meaningful variable names.
*   **Robust:**  The design should be reasonably robust to parameter changes, without creating obvious errors.
*   **Comments:** Include clear comments that explain what different sections of the code are doing.

**Libraries:**
* No libraries are needed

**Final notes:**

I need to be able to render this object in OpenSCAD and have it work correctly. Please generate an OpenSCAD file that accomplishes this.

[Assistant]
tri_glide_v1-0_with-eyelet.scad:
```
//=== Flat Tri Glide ===//

//width of the webbing opening (1in = 25.4 mm)
_1_webbingWidth = 26;

// width of the gap for the webbing
_2_webbingGap = 4.5;

// thickness of the edge
_3_edgeThickness = 3.5;

// thickness of the center beam
_4_centerThickness = 4.5;

// height of the tri glide
_5_height = 3;

// percent corner rounding
_6_cornerRounding = 75; // [1:100]

// ho much to break off the edges
_7_cornerBreakage = 0.66;

// diameter of eyelet
_8_eyeDiameter = 7;

// thicknes of the eyelets rim
_9_eyeRimThickness = 4;

module makeBody(xsize, ysize, height, radius,edgeThickness,eyeRad,eyeRim) {
	translate([0,0,height/2]) {
		minkowski() {
			cube(size=[xsize-2*radius,ysize-2*radius, height/2], center = true);
			cylinder(r=radius, h=height/2, center=true);
		}
	}
	translate([0,ysize/2+eyeRad,0])
		cylinder(r=eyeRad+eyeRim,h=height);
}

module makeCuts(width, gap, thickness, height,b,eyeRad,eyeRim) {
    eps=0.05;
	offset = (thickness+gap)/2;
	for (y = [-offset, offset]) {
		translate([0, y, 0]) {

			translate([0, 0, height/2])
				cube(size=[width, gap, height*2], center=true);
			translate([0, 0, 0])
				makeCutEnd(width, gap, thickness, height,b);
			translate([0, 0, height]) scale([1,1,-1])
				makeCutEnd(width, gap, thickness, height,b);
		}
	translate([0,2*offset+gap/2 +eyeRad,-height*0.1])
		cylinder(r=eyeRad,h=height*1.2);
	translate([0,2*offset+gap/2 +eyeRad,-eps])
		cylinder(r1=eyeRad+b,r2=eyeRad,h=b);
	translate([0,2*offset+gap/2 +eyeRad,height-b+eps])
		cylinder(r1=eyeRad,r2=eyeRad+b,h=b);
	}
}

module makeCutEnd(width, gap, thickness, height,b)
{
	hull(){
		translate([0,0,+b/2])
			cube(size=[width, gap, b], center=true);
		translate([0,0,-b/2])
			cube(size=[width+2*b, gap+2*b, b], center=true);
	}
}

module makeTriGlide(width, gap, edgeThickness, centerThickness, height, rounding,
                    b, eyeDiam, eyeRim ,$fn=90) {
	xsize = width + edgeThickness * 2;
	ysize = centerThickness + edgeThickness * 2 + gap * 2;
	radius = edgeThickness*(rounding/100);
	difference() {
        hull()
        {
		  makeBody(xsize-2*b, ysize-2*b, height, radius,edgeThickness,eyeDiam/2,eyeRim);
          translate([0,0,b])
		  makeBody(xsize, ysize, height-2*b, radius,edgeThickness,eyeDiam/2,eyeRim);
        }
		makeCuts(width, gap, centerThickness, height,b,eyeDiam/2,eyeRim);
	}
}

makeTriGlide(_1_webbingWidth, _2_webbingGap, _3_edgeThickness, _4_centerThickness, _5_height, _6_cornerRounding,_7_cornerBreakage,_8_eyeDiameter,_9_eyeRimThickness);

```


[User]
Okay, I'm looking to create a customizable hobby knife handle and related parts using OpenSCAD. I've seen a design that's pretty close to what I want, and I'd like to adapt it and make it more flexible.

Specifically, I want to design a system that includes the following components:

1.  **Knife Handle:** This will be the main body of the handle, with a threaded section at one end for attaching the blade holder. The main body should be a cylinder with a customizable length and diameter, and it should have space for text to be written on it. I'd like the text to be customizable, too. I'd also like to be able to control the thread parameters (diameter, step, angle, and length). The original design used a knurled surface, I think I'd like to keep that option, but make it optional.

2.  **Knife Sleeve:** This is a small sleeve that goes between the handle and the blade holder. It should be cylindrical, with a flange at one end to provide a secure fit. I'd like to be able to control the height and diameter of both the cylinder and the flange. The knurled surface should also be optional for this part.

3.  **Knife Holder:** This part actually holds the blade. It has a threaded section on one end for screwing into the handle, and a slit to hold the blade. It has a bottom portion that mates with the sleeve, a flared section, and finally a slit for holding the blade. I need to be able to control the thread parameters as well as the overall height, the height of the shank (the bottom portion), the diameters of the bottom and flare, and the width and height of the slit.

I'd like to be able to control all the major dimensions of these parts via parameters at the top of the script. I'd also like the script to be modular, so I can easily generate each part on its own.

The original design I saw uses the following libraries, which are very helpful, and I would like to continue using them for this new design:
*   `polyScrewThread.scad`
*   `knurledFinishLib_v2.scad`
*   `write/Write.scad`

For the text on the handle, I'd like to be able to specify the font, and the text itself. Additionally, the text should be placed centered on the handle's surface.

I would like to be able to generate an exploded view to better visualize the assembly.

Finally, I want to make sure that the dimensions of the screw threads are easily modifiable and that there is a good way to allow for some "fudge" in the fit, as it's noted in the existing example.

Can you generate a new OpenSCAD file that allows for this level of customization and modularity?

[Assistant]
Hobby_Knife.scad:
```
/*
 * Hobby Knife.scad:  A 3D printable hobby knife handle
 *
 * Written by Steven Morlock, smorloc@gmail.com
 *
 * This script is licensed under the Creative Commons Attribution - Share Alike license:
 *     http://creativecommons.org/licenses/by-sa/3.0/
 *
 * This work is derived from the following existing projects found on Thingiverse:
 *
 *     Knurled Surface Library v2, by aubenc:
 *         http://www.thingiverse.com/thing:32122
 *
 *     Poor man's openscad screw library, by aubenc:
 *         http://www.thingiverse.com/thing:8796
 *
 *     Write.scad, by HarlanDMii:
 *         http://www.thingiverse.com/thing:16193
 *
 */

use <polyScrewThread.scad>
use <knurledFinishLib_v2.scad>
use <write/Write.scad>

PI = 3.141592;

// Uncomment what you are working on:
//knife_holder();
//knife_handle();
//knife_sleeve();
knife_exploded_view();

//
// Handle parameters
//
screw_diameter = 7.3;
screw_step = 2;
screw_degrees = 55;
screw_length = 10.3;
screw_countersink = -1;     // -1 - Bottom (countersink'd and top flat)

handle_diameter = 11.3;
handle_length = 100;
handle_thread_length = screw_length * 1.5;

//
// Sleeve parameters
//
sleeve_height = 20;
sleeve_inside_diameter = 9.2;
sleeve_flange_height = 2;
sleeve_flange_diameter = screw_diameter + 0.75;

//
// Holder parameters
//
slit_width = 0.8;
slit_height = 21.0;
total_height = 22.0;
shank_height = 12.0;		// distance from bottom to start of flare
dia_bottom = 7.3;
dia_flare = 10.7;

module knife_sleeve()
{
    difference()
    {
        knurl(k_cyl_hg = sleeve_height,
                k_cyl_od = handle_diameter,
                knurl_wd =  2.0,
                knurl_hg =  3.0,
                knurl_dp = 1.0,
                s_smooth = 50);
        translate([0,0,sleeve_flange_height])
        cylinder(h=sleeve_height,
                r1=sleeve_inside_diameter / 2,
                r2=sleeve_inside_diameter / 2,
                $fn=200,
                center=false);
        cylinder(h=sleeve_height,
                r1=sleeve_flange_diameter / 2,
                r2=sleeve_flange_diameter / 2,
                $fn=200,
                center=false);
    }
}
module knife_handle()
{
    // The sloppier your print, the more fudge you may need
    // in order to get the holder to screw into the handle.
    thread_fudge = 0.5;

    difference()
    {
        // Body
        cylinder(h=handle_length,
                r1=handle_diameter / 2,
                r2=handle_diameter / 2,
                $fn=200,
                center=false);

        // Countersink
        translate([0,0,handle_length - screw_step / 2 + 0.1])
        cylinder(h=screw_step / 2 + 0.01,
                r1=screw_diameter / 2 - screw_step / 2,
                r2=screw_diameter / 2,
                $fn=200,
                center=false);

        // Thread
        translate([0, 0, handle_length-handle_thread_length])
        screw_thread(screw_diameter + thread_fudge,
                screw_step,
                screw_degrees,
                handle_thread_length,
                PI/2,
                -2);

        writecylinder("Inexacto",
            [0,0,0],
            radius = handle_diameter / 2,
            height = handle_length,
            rotate = -90,
            font = "orbitron.dxf",
            space =1.2,
            h = 4.5,
            t = 2);
        writecylinder("Inexacto",
            [0,0,0],
            radius = handle_diameter / 2,
            height = handle_length,
            east = 180,
            rotate = -90,
            font = "orbitron.dxf",
            space =1.2,
            h = 4.5,
            t = 2);
    }
}

module knife_holder()
{
    relief = 0.3;

    union()
    {
        screw_thread(screw_diameter,
                screw_step,
                screw_degrees,
                screw_length,
                PI / 2,
                screw_countersink);

        translate([0, 0, screw_length])
        intersection()
        {
            difference()
            {
                knife_holder_body();
                knife_holder_slit();
            }

            // Knock off the sharp edge on the top of the holder
            union()
            {
                cylinder(h = total_height - relief,
                        r = dia_flare / 2 - relief,
                        $fn = dia_flare * PI,
                        center = false);
                translate([0, 0, total_height - relief])
                cylinder(h = relief,
                        r1 = dia_flare / 2 - relief,
                        r2 = dia_flare / 2 - relief * 2,
                        $fn = dia_flare * PI,
                        center = false);
            }
        }
    }
}

module knife_holder_body()
{
    union()
    {
        // Bottom
        cylinder(h = total_height,
                r = dia_bottom / 2,
                $fn = dia_bottom * PI,
                center = false);

        // Bottom of flare to top
        translate([0, 0, shank_height])
        cylinder(h = total_height - shank_height,
                r1 = dia_bottom / 2,
                r2 = dia_flare / 2,
                $fn = dia_bottom * PI,
                center = false);
    }
}

module knife_holder_slit()
{
    margin = 2;

    dia = dia_flare + margin;

    translate([-dia/2, -slit_width/2, total_height - slit_height])
    cube(size=[dia, slit_width, slit_height + margin], center=false);
}

module knife_exploded_view()
{
    // Good for Thingiverse generated 3D view...
    space = 5;
    rotate([60, 60, 0])
    {
        rotate([0, 0, -45])
        knife_handle();
        translate([0, 0, handle_length + space])
        knife_sleeve();
        translate([0, 0, handle_length + space + sleeve_height + space])
        rotate([0, 0, 45])
        knife_holder();
    }
}

```