[User]
Okay, I'm looking to build a compact, high-reduction gear drive, and I think I've found a good starting point but I need to make it more customizable. I've been playing around with this differential planetary drive design, and it's working really well, but I need to be able to tweak a few more things.

Essentially, I'm aiming for a design where the planetary gears act as their own bearings, and the whole assembly is pretty self-contained. The current design I'm working with uses a central sun gear, planetary gears orbiting around it, and two ring gears, one that is fixed and one that acts as the output. The key is the different tooth counts on the two ring gears, which provides the gear reduction. The file I have is attached (named `diffplanet1.scad`), but it's hard to modify without a full understanding of how the math works.

Here are the current parameters I'm using and what I’d like to be able to control:

*   **`D`**:  Outer diameter of the ring gear. This is currently set to 70mm, but I'd like to make that a parameter.
*   **`T`**: Thickness of the gear assembly. Right now it's 15mm, and I'd like to control this, maybe with separate values for the rings and planet gears?
*  **`tol`**: Clearance between the gear teeth. Currently 0.15mm. This needs to be exposed.
*  **`vtol`**: Vertical clearance. Currently set to 0.5mm. This also needs to be exposed.
*   **`number_of_planets`**: The number of planetary gears. Set to 4 currently, but I'd like this to be adjustable to change the load on the system.
*   **`number_of_teeth_on_planets`**: The number of teeth on each planetary gear. This is currently 14, and I'd like to make this a parameter.
*   **`approximate_number_of_teeth_on_sun`**: An approximate tooth count for the sun gear that the program then corrects. This is currently 12, and I'd like to change it.
*   **`delta`**: The difference in the number of teeth between the two ring gears, a key to the gear ratio. This is set to -1 and is very important for setting the reduction.
*   **`nTwist`**: The number of teeth to twist the gear across, to give a helical gear. Currently 1.
*   **`P`**: Pressure angle of the gear teeth. Currently 30 degrees.
*   **`w`**: Width of the hexagonal hole in the center of the gears. Currently 6.7mm.

**Here's what I'm specifically looking for in the output OpenSCAD file:**

1.  **Parametric Design**: The design should be fully parametric, allowing me to adjust all the variables mentioned above (D, T, tol, vtol, number\_of\_planets, number\_of\_teeth\_on\_planets, approximate\_number\_of\_teeth\_on\_sun, delta, nTwist, P, and w).
2.  **Clearance Control:** Make sure the `tol` and `vtol` parameters are used effectively for smooth operation and the assembly is easy.
3.  **Calculated Values:** The script currently calculates `ns`, `nr`, `nr2`, `np2`, `pitchD`, `pitch`, `helix_angle`, `R1`, `R2`, and `R`. These should still be calculated based on the user parameters and then echoed out to the console so that I can see the actual reduction achieved.
4.  **Input/Output Selection**: Similar to the attached file, I'd like to select between rendering the whole assembly, the planetary gear carrier and sun gear (input), or the output ring gear.
5.  **Modularity**: The planetary, ring, and gear modules should be separated out, as is done in the original file.
6. **Herringbone Gear**: The planetary gears need to be a herringbone style gear as in the original file.
7.  **Hexagonal Bore**: The gears should have the hexagonal bore, sized correctly based on the `w` parameter.
8.  **Output Text:** The planetary carrier should have the calculated gear reduction ratio displayed on it.
9.  **Library Usage**: Please use the `Write.scad` library for the writing functionality.

I realize there's a good deal of math behind this so, I would appreciate your help in generating this parametric OpenSCAD file so I can start experimenting with this awesome gear drive! Thanks!

[Assistant]
diffplanet1.scad:
```
// Differential planetary drive (customizable)

use <write/Write.scad>

//assembly();
choose(export);

// choose the object to render
export=0;// [0:Input,1:Output]
// outer diameter of ring
D=70;
// thickness
T=15;
// clearance between gear teeth
tol=0.15;
// vertical clearance
vtol=0.5;
number_of_planets=4;
number_of_teeth_on_planets=14;
approximate_number_of_teeth_on_sun=12;
// difference in teeth on ring gears
delta=-1;
// number of teeth to twist across
nTwist=1;
// pressure angle
P=30;
// width of hexagonal hole
w=6.7;

DR=2/PI;// maximum depth ratio of teeth

m=round(number_of_planets);
np=round(number_of_teeth_on_planets);
nsa=approximate_number_of_teeth_on_sun;
ka=round(2/m*(nsa+np));
k= ka*m%2!=0 ? ka+1 : ka;
ns=k*m/2-np;
echo(ns);
nr=ns+2*np;
nr2=nr+delta;
np2=np+delta;
pitchD=0.9*D/(1+depth_diameter(nr,P,DR));
pitch=pitchD*PI/nr;
echo(pitch);
helix_angle=atan(2*nTwist*pitch/T);
echo(helix_angle);

phi=$t*360;
R1=(1+nr/ns);// sun to planet-carrier ratio
R2=-nr2*np/(ns+np)/delta;// planet-carrier to ring ratio
R=R1*R2;
echo(R);

module choose(i){
if(i==0) planetary();
else ring();
}

module plate(){
translate([D+1,0,0])planetary();
translate([-D-1,0,0])ring();
}

module assembly(){
planetary();
translate([0,0,3*T/2+1+3*vtol])rotate([180,0,phi/R2-turn(nr2,pitch,helix_angle,vtol)])render()ring();
}

module ring()
difference(){
	union(){
		difference(){
			cylinder(r=D/2*nr2/nr,h=T/2+1,$fn=100);
			translate([0,0,1])gear(nr2,pitch,P,DR,-tol,helix_angle,T/2+0.2);
		}
		cylinder(r=0.9*innerR(ns,pitch,P,tol,DR),h=T/2+1);
		cylinder(r=w/3,h=T/2+1+3*vtol);
	}
	translate([0,0,-1])cylinder(r=w/sqrt(3),h=T,center=true,$fn=6);
	for(i=[1:3])rotate([0,0,i*120])translate([pitchD/2*(ns+np)/nr,0,0])
		cylinder(r=innerR(np2,pitch,P,tol,DR),h=3,center=true);
}

module planetary()
translate([0,0,T/2]){
	difference(){
		cylinder(r=D/2,h=T,center=true,$fn=100);
		herringbone(nr,pitch,P,DR,-tol,helix_angle,T+0.2);
		difference(){
			union(){
				rotate([0,0,180])translate([0,-D/2,0])rotate([90,0,0])monogram(h=10);
				writecylinder(text=str(R),radius=D/2,h=5,t=2,
					font="write/Letters.dxf");
			}
			cylinder(r=D/2-0.25,h=T+2,center=true,$fn=100);
		}
	}
	rotate([0,0,(np+1)*180/ns+phi*R1])
	difference(){
		mirror([0,1,0])
			herringbone(ns,pitch,P,DR,tol,helix_angle,T);
		translate([0,0,-1])cylinder(r=w/sqrt(3),h=T,center=true,$fn=6);
	}
	for(i=[1:m])rotate([0,0,i*360/m+phi])translate([pitchD/2*(ns+np)/nr,0,0])
		rotate([0,0,-phi*(ns+np)/np-phi]){
			difference(){
				rotate([0,0,i*ns/m*360/np])herringbone(np,pitch,P,DR,tol,helix_angle,T+3*vtol);
				translate([0,0,-D/2-T/2])cube(D,center=true);
			}
			rotate([0,0,i*ns/m*360/np-turn(np,pitch,helix_angle,vtol)])translate([0,0,T/2+vtol-0.01])
				cylinder(r=outerR(np,pitch,P,tol,DR)-tol,h=vtol+0.02,$fn=np);
			rotate([0,0,-i*nr2/m*360/np2])translate([0,0,T/2+2*vtol])
				gear(np2,pitch,P,DR,tol,helix_angle,T/2);
		}
}

module monogram(h=1)
linear_extrude(height=h,center=true)
translate(-[3,2.5])union(){
	difference(){
		square([4,5]);
		translate([1,1])square([2,3]);
	}
	square([6,1]);
	translate([0,2])square([2,1]);
}

module herringbone(
	number_of_teeth=15,
	circular_pitch=10,
	pressure_angle=20,
	depth_ratio=2/PI,
	clearance=0,
	helix_angle=0,
	gear_thickness=5){
union(){
	gear(number_of_teeth,
		circular_pitch,
		pressure_angle,
		depth_ratio,
		clearance,
		helix_angle,
		gear_thickness/2);
	mirror([0,0,1])
		gear(number_of_teeth,
			circular_pitch,
			pressure_angle,
			depth_ratio,
			clearance,
			helix_angle,
			gear_thickness/2);
}}

module gear (
	number_of_teeth=15,
	circular_pitch=10,
	pressure_angle=20,
	depth_ratio=2/PI,
	clearance=0,
	helix_angle=0,
	gear_thickness=5,
	flat=false){
twist=turn(number_of_teeth,circular_pitch,helix_angle,gear_thickness);

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

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

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

intersection(){
	circle($fn=number_of_teeth*2,r=outer_radius);
	union(){
		rotate(90/number_of_teeth)
			circle($fn=number_of_teeth*2,r=inner_radius);
		for (i = [1:number_of_teeth])rotate(i*360/number_of_teeth){
			halftooth (
				base_radius,
				min_radius,
				max_radius,
				tip_angle);
			mirror([0,1])halftooth (
				base_radius,
				min_radius,
				max_radius,
				tip_angle);
		}
	}
}}

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

difference(){
	rotate(-tip_angle)polygon(points=p);
	square(2*max_radius);
}}

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

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

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

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

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

function pitchR(Nteeth=15, pitch=10) = Nteeth*pitch/(2*PI);

function turn(Nteeth=15, pitch=10, helix_angle=0, h=5) = tan(helix_angle)*h/pitchR(Nteeth, pitch)*180/PI;

function rackDepth(pitch=10, pressure_angle=20) = pitch/(2*tan(pressure_angle));

function baseR(Nteeth=15, pitch=10, pressure_angle=20) = pitchR(Nteeth, pitch)*cos(pressure_angle);

function innerR(Nteeth=15, pitch=10, pressure_angle=20, clearance=0, depth_ratio=2/PI) =
	max(max(pitchR(Nteeth, pitch)-rackDepth(pitch, pressure_angle)/2-clearance/2,
		baseR(Nteeth, pitch, pressure_angle)*sign(-clearance)),
		pitchR(Nteeth, pitch)-depth_ratio*pitch/2-clearance/2);

function outerR(Nteeth=15, pitch=10, pressure_angle=20, clearance=0, depth_ratio=2/PI) =
	pitchR(Nteeth, pitch) + min(depth_ratio*pitch/2-clearance/2,
		rackDepth(pitch, pressure_angle)/2+max(-clearance,0));

function depth_diameter(Nteeth=15, pressure_angle=20, depth_ratio=2/PI) =
	min(PI/(2*Nteeth*tan(pressure_angle)),PI*depth_ratio/Nteeth);
```


[User]
Okay, I'd like to design a ring with some text on it, and I need an OpenSCAD file to do it. I've seen a few examples, and I like some of the features, but I need some customizations.

Here are the features I'd like:

1. **Ring Sizing:** I want to be able to easily specify the ring size, preferably using US ring sizes (like the chart from [http://www.thingiverse.com/thing:40704](http://www.thingiverse.com/thing:40704)). I need the design to correctly convert that ring size to the inner diameter of the ring.

2. **Ring Thickness:** I need a parameter to control the thickness of the ring (how far the ring extends from the center of the cylinder).

3. **Ring Width at Back:** I need a parameter to control the width of the ring at the back of the finger. This would be the vertical width of the ring along the back of the finger if you were looking at your finger.

4. **Ring Angle (Taper):**  I want to be able to set an angle that controls how much the ring tapers from the back to the front. Zero degrees would mean the width of the ring is constant, and non-zero would give it a tapered look.

5. **Text on the Face:** I want to be able to put text on the front, outside surface of the ring. I need parameters to specify:
    * The text itself.
    * The text size.
    * The spacing between the letters.

6.  **Text Inside the Ring:**  I need to be able to put an inscription on the inside of the ring. I need parameters to specify:
    * The text itself.
    * The text size.
    * The spacing between the letters.

7. **Part Selection:** I want a parameter to select whether the code generates a full ring, or only the text inscription parts. This is useful if I only want to test what the inscription will look like.

8.  **Dual Extrusion Support:** If I select "inscription" I want the resulting text (both internal and external) to be a solid, printable object. Ideally it would have the same width as the ring's thickness, so that if I 3D print them with two extruders, the text could be in a different color. This should be the same thickness as the *ring's* "thick" parameter.

9. **`write/Write.scad` Library:** The example files I've seen use the `write/Write.scad` library for the text generation. I'd like to use this same library. Please don't include this library with the code you write, I have it already.

I'd like to be able to preview the ring from the west and have a top tilt view by default in the OpenSCAD preview window.

The examples I've seen (RingThingV5.scad and RingThingV6.scad) are good starting points but have some minor issues with the inscription part I'd like to avoid. For example, in v5 if `text` or `text_face` are empty strings, they still generate "something", and v6 seems to fix this. I'd also like the code to generate the inscription parts as solid objects for dual-extrusion printing. Can you help me write this parametric OpenSCAD code?

[Assistant]
RingThingV6.scad:
```
use <write/Write.scad>

// Version 6. March 11, 2013
// Fixed a problem with not properly handling the case when there is no text but we are generating the "inscription" part

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

//CUSTOMIZER VARIABLES

// Sizing for the finger

// Chart taken from http://www.thingiverse.com/thing:40704
//(US Ring Sizes)
ring_size = 15.09;//[11.63:0,11.84:0.25,12.04:0.5,12.24:0.75,12.45:1,12.65:1.25,12.85:1.5,13.06:1.75,13.26:2,13.46:2.25,13.67:2.5,13.87:2.75,14.07:3,14.27:3.25,14.48:3.5,14.68:3.75,14.88:4,15.09:4.25,15.29:4.5,15.49:4.75,2215.9:5.25,16.1:5.5,16.31:5.75,16.51:6,16.71:6.25,16.92:6.5,17.12:6.75,17.32:7,17.53:7.25,17.73:7.5,17.93:7.75,18.14:8,18.34:8.25,18.54:8.5,18.75:8.75,18.95:9,19.15:9.25,19.35:9.5,19.56:9.75,19.76:10,19.96:10.25,20.17:10.5,20.37:10.75,20.57:11,20.78:11.25,20.98:11.5,21.18:11.75,21.39:12,21.59:12.25,21.79:12.5,22:12.75,22.2:13,22.4:13.25,22.61:13.5,22.81:13.75,23.01:14,23.22:14.25,23.42:14.5,23.62:14.75,23.83:15,24.03:15.25,24.23:15.5,24.43:15.75,24.64:16]

c_r=ring_size/2;

// Thickness of the ring
thick=2;//[2:4]
// Up and down width at the back of the ring
ring_width=5;//[5:7]
// Angle from back to front. 0 is uniform width
ring_angle=15;//[0:20]

// Text on the face
text_face="Bilbo";
// Text size on the face
text_size_face = 4; // [3:9]
// Text spacing on the face
space_size_face=1.0*1;

// Text of the interior inscription
text="Baggins";
// Text Size on interior inscription
text_size_interior =  3;  // [3:5]
// Text spacing on the interior
space_size =1.0*1;

// Which one would you like to see?
part = "ring"; // [ring:Ring,inscription:Inscription]

s_r=c_r+2*thick;
x_offset=-thick;
y_b=ring_width/2;
x_b=sqrt(s_r*s_r-y_b*y_b);

angle=ring_angle;

translate([c_r+thick,0,0])
rotate([0,angle,0])
translate([-x_b,0,y_b])
{
  if(part=="ring")
  difference() {
    difference() {
      difference() {
        translate([0,0,0]) sphere(s_r,$fn=100,center=true);
        union() {
          translate([-x_offset,0,0]) cylinder(60,c_r,c_r,$fn=100,center=true);
          translate([+x_b,0,y_b]) rotate([0,angle,0]) translate([-x_b-s_r,-s_r,0]) cube([2*s_r,s_r*2,s_r]);
          translate([+x_b,0,-y_b]) rotate([0,-angle,0]) translate([-x_b-s_r,-s_r,-s_r]) cube([2*s_r,s_r*2,s_r]);
        }
      }
      translate([-s_r-c_r,-s_r,-s_r]) cube([s_r,2*s_r,2*s_r]);
    }
    translate([-x_offset,0,0]) mirror([ 0, 1, 0 ]) writesphere(text,[0,0,0],c_r,east=90,t=thick,h=text_size_interior,font="write/Letters.dxf", space=space_size,center=true);
      translate([-c_r,0,0]) rotate([90,0,-90]) write(text_face,h=text_size_face,t=thick,font="write/Letters.dxf",space=space_size_face,center=true);
  }

  if(part=="inscription") {

    if(len(text))
    color("red")
    intersection() {
      difference() {
        translate([-x_offset,0,0]) cylinder(10,c_r+thick,c_r+thick,$fn=100,center=true);
        translate([-x_offset,0,0]) cylinder(10,c_r,c_r,$fn=100,center=true);
      }
      translate([-x_offset,0,0]) mirror([ 0, 1, 0 ]) writesphere(text,[0,0,0],c_r,east=90,t=thick,h=text_size_interior,font="write/Letters.dxf", space=space_size,center=true);
    } // End of intersection() for the interior text

    if(len(text_face))
    color("red")
    intersection() {
      translate([-c_r,-s_r,-s_r]) cube([thick,2*s_r,2*s_r]);
      translate([-c_r,0,0]) rotate([90,0,-90]) write(text_face,h=text_size_face,t=thick,font="write/Letters.dxf",space=space_size_face,center=true);
    } // End of intersection() for the text on the face

  } // End of part=="inscription"
}

```
RingThingV5.scad:
```
use <write/Write.scad>

// Version 2. Feb 26, 2013

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

//CUSTOMIZER VARIABLES

// Sizing for the finger

// Chart taken from http://www.thingiverse.com/thing:40704
//(US Ring Sizes)
ring_size = 15.09;//[11.63:0,11.84:0.25,12.04:0.5,12.24:0.75,12.45:1,12.65:1.25,12.85:1.5,13.06:1.75,13.26:2,13.46:2.25,13.67:2.5,13.87:2.75,14.07:3,14.27:3.25,14.48:3.5,14.68:3.75,14.88:4,15.09:4.25,15.29:4.5,15.49:4.75,2215.9:5.25,16.1:5.5,16.31:5.75,16.51:6,16.71:6.25,16.92:6.5,17.12:6.75,17.32:7,17.53:7.25,17.73:7.5,17.93:7.75,18.14:8,18.34:8.25,18.54:8.5,18.75:8.75,18.95:9,19.15:9.25,19.35:9.5,19.56:9.75,19.76:10,19.96:10.25,20.17:10.5,20.37:10.75,20.57:11,20.78:11.25,20.98:11.5,21.18:11.75,21.39:12,21.59:12.25,21.79:12.5,22:12.75,22.2:13,22.4:13.25,22.61:13.5,22.81:13.75,23.01:14,23.22:14.25,23.42:14.5,23.62:14.75,23.83:15,24.03:15.25,24.23:15.5,24.43:15.75,24.64:16]

c_r=ring_size/2;

// Thickness of the ring
thick=2;//[2:4]
// Up and down width at the back of the ring
ring_width=5;//[5:7]
// Angle from back to front. 0 is uniform width
ring_angle=15;//[0:20]

// Text on the face
text_face="Bilbo";
// Text size on the face
text_size_face = 4; // [3:9]
// Text spacing on the face
space_size_face=1.0*1;

// Text of the interior inscription
text="Baggins";
// Text Size on interior inscription
text_size_interior =  3;  // [3:5]
// Text spacing on the interior
space_size =1.0*1;

// Which one would you like to see?
part = "ring"; // [ring:Ring,inscription:Inscription]

s_r=c_r+2*thick;
x_offset=-thick;
y_b=ring_width/2;
x_b=sqrt(s_r*s_r-y_b*y_b);

angle=ring_angle;

translate([c_r+thick,0,0])
rotate([0,angle,0])
translate([-x_b,0,y_b])
{
  if(part=="ring")
  difference() {
    difference() {
      difference() {
        translate([0,0,0]) sphere(s_r,$fn=100,center=true);
        union() {
          translate([-x_offset,0,0]) cylinder(60,c_r,c_r,$fn=100,center=true);
          translate([+x_b,0,y_b]) rotate([0,angle,0]) translate([-x_b-s_r,-s_r,0]) cube([2*s_r,s_r*2,s_r]);
          translate([+x_b,0,-y_b]) rotate([0,-angle,0]) translate([-x_b-s_r,-s_r,-s_r]) cube([2*s_r,s_r*2,s_r]);
        }
      }
      translate([-s_r-c_r,-s_r,-s_r]) cube([s_r,2*s_r,2*s_r]);
    }
    translate([-x_offset,0,0]) mirror([ 0, 1, 0 ]) writesphere(text,[0,0,0],c_r,east=90,t=thick,h=text_size_interior,font="write/Letters.dxf", space=space_size,center=true);
      translate([-c_r,0,0]) rotate([90,0,-90]) write(text_face,h=text_size_face,t=thick,font="write/Letters.dxf",space=space_size_face,center=true);
  }

  if(part=="inscription") {
    color("red")
    intersection() {
      difference() {
        translate([-x_offset,0,0]) cylinder(10,c_r+thick,c_r+thick,$fn=100,center=true);
        translate([-x_offset,0,0]) cylinder(10,c_r,c_r,$fn=100,center=true);
      }
      translate([-x_offset,0,0]) mirror([ 0, 1, 0 ]) writesphere(text,[0,0,0],c_r,east=90,t=thick,h=text_size_interior,font="write/Letters.dxf", space=space_size,center=true);
    }
    color("red")
    intersection() {
      translate([-c_r,-s_r,-s_r]) cube([thick,2*s_r,2*s_r]);
      translate([-c_r,0,0]) rotate([90,0,-90]) write(text_face,h=text_size_face,t=thick,font="write/Letters.dxf",space=space_size_face,center=true);
    }
  }
}

```


[User]
Okay, I'm looking to design a customizable cup, or "tasse," in OpenSCAD, and I'd like your help writing the code.

Here's what I have in mind:

**Basic Cup:**

*   The cup should be cylindrical.
*   I need to be able to control the overall `tasseH` height and `tasseR` radius.
*   I also need to be able to set the `tasseWand` wall thickness.

**Handle Options:**

*   I want two different handle types, `henkelType`.
    *   `henkelType = 1` should produce a more rounded handle, sort of like an extrusion of a circle.
	*	`henkelType = 2` should produce a flatter handle, somewhat like a rounded rectangle with a hole in the middle.
*   For both handle types, I need to control:
    *   The `henkelR` radius of the handle (or the main curved section of it).
    *   The `henkelDicke` thickness (how much it protrudes from the cup's wall).
*   I need to be able to position the handle vertically on the cup using a `henkelPosition` percentage value (0 to 100), where 0 puts the base of the handle at the bottom of the cup and 100 puts it at the top. This will determine the overall position of the handle along the height of the cup.

Essentially, I'd like to be able to modify the `tasseH`, `tasseR`, `tasseWand`, `henkelType`, `henkelR`, `henkelDicke`, and `henkelPosition` variables as parameters.

I don't need anything complex in terms of the libraries. Just standard OpenSCAD functionality should be fine.

[Assistant]
Tasse.scad:
```
// CustomTasse / Cup v.03
// My first openScad Test
// onlyjonas, 2013-05-4

//cup height
tasseH = 90;
//cup radius
tasseR = 25;
//wall thickness
tasseWand = 3;
//handle type
henkelType = 2; //[1, 2]
//handle radius
henkelR = 15;
//handle thickness
henkelDicke = 4;
//handle position in percentage
henkelPosition = 90; //[0:100]

module henkelA(henkelPos)
{
	translate([tasseR+henkelR-10,0,henkelPos])
	rotate([90,0,0])
	rotate_extrude(convexity = 10, $fn = 360)
	translate([henkelR, 0, 0])
	circle(henkelDicke);
}

module henkelB(henkelPos)
{
	translate([tasseR+henkelR,0,henkelPos])
	rotate([-90,90,0])
	linear_extrude(height = henkelDicke){
	difference() {

		union(){
			circle(henkelR, $fn = 360);
			translate([0, henkelR , 0]) square([henkelR*2, henkelR*2], center=true);
		}

		circle(henkelR-henkelDicke, $fn = 360);
	}
	};
}

module henkel()
{
	pos = ((tasseH-henkelR*2)*henkelPosition/100)+henkelR;

	if (henkelType==1) henkelA(pos);
	if (henkelType==2) henkelB(pos);
}

module tasse()
{

	difference() {
		union() {
		cylinder(h = tasseH, r = tasseR, $fn = 360);
		henkel();
		}
		translate([0,0,tasseWand])
		cylinder(h = tasseH+tasseWand, r = tasseR-tasseWand, $fn = 360);

	}
}

tasse();

```


[User]
Okay, I have a design I'm trying to make in OpenSCAD, and I need some help making it more flexible. I'm building a leg for a scissor lift mechanism, and I want it to be parametric so I can easily change its dimensions and the number of intermediate pivot points.

Right now, I have a basic leg that's essentially a rectangular bar with holes. There are larger pivot holes at each end and in the middle, and then smaller holes evenly spaced in between. I've hardcoded a bunch of these parameters, and I'm having to fiddle with some of them to get it to print right.

Here's a breakdown of what I need:

*   **Overall Leg Length:** I want to be able to set the total length of the leg.
*   **Bar Width & Thickness:** I need to define the width and thickness of the rectangular bar itself.
*   **Pivot Hole Diameter:** The larger diameter of the holes at the ends and center of the leg.
*   **Number of Intermediate Holes:**  The number of smaller holes between the pivot points.
*   **Intermediate Hole Diameter:** The diameter of those smaller holes.
*  **Hole Offset**: I have an issue where the intermediate holes need to be slightly offset from their calculated position for them to function, it would be nice to be able to adjust that.
*   **Printing Spacing**: I want to make it easy to print multiple of these and have a spacing between them for easy removal from the printbed.
*   **Print Count**: I want to be able to specify how many legs I want to print at once.

I'd like the code to automatically calculate the positions of all the holes based on the total leg length and the number of intermediate holes. It would be great if the code was clear and easy to modify.

I would like to avoid the `hull()` operation if possible, as it can have some unexpected results.

I’m also printing multiple of these, I have the ability to print a number of them side-by-side in rows. I'd like the script to automatically space them out in a row and print a certain number of legs.

Ideally, the output would use the BOSL2 library, if that makes sense, for some of its more advanced functions such as creating the holes, or for moving the objects. I'd really like to have a modular design, if possible.

Can you help me generate a parametric OpenSCAD file for this? I’m including my current code as reference.

[Assistant]
scissorLift.scad:
```
//General Variables
legLength = 80;
width = 12; //width of the bar
thickness = 5; //thickness of the bar
pivotDiameter = 6; //diameter of the holes on the ends and center
holes = 4; //number of holes in between end and middle holes
holeDiameter = 4; //size of the holes

//fine-tuning (aka can't get the code just right)
holeOffset = 2;

//printing-related
spaceBetweenPrints = 3;
printCount = 1;

//generated variables
holeStart   = legLength/2 + pivotDiamater;

module scissorLiftLeg() {

	difference() {
		hull() {
			translate([(legLength/2),0,0]) cylinder(r=width/2,h=thickness);
			translate([(legLength/-2),0,0]) cylinder(r=width/2,h=thickness);
		}
		for (i=[0:holes-1]) {
			translate([legLength/2 - legLength/2/(holes+1)*i - pivotDiameter - holeDiameter/2,0,0])
				cylinder(r=holeDiameter/2, h=thickness);
			translate([-legLength/2 + legLength/2/(holes+1)*i + pivotDiameter + holeOffset,0,0])
				cylinder(r=holeDiameter/2, h=thickness);
		}
		//End holes and center
		translate([legLength/2,0,0])
			cylinder(r=pivotDiameter/2, h=thickness);
		translate([-legLength/2,0,0])
			cylinder(r=pivotDiameter/2, h=thickness);
		cylinder(r=pivotDiameter/2, h=thickness);
	}
}

offsetPerPrint = width+spaceBetweenPrints;
for ( i = [0 : printCount/2] ) { //do -printcount/2:printcount/2 for centered
	translate([0, i*offsetPerPrint, 0])
		scissorLiftLeg();
	if (i*2 < printCount) {
	translate([0, -i*offsetPerPrint, 0])
		scissorLiftLeg();
	}
}
scissorLiftLeg(); //at least print the middle one!

```


[User]
Okay, I'd like to design a 3D printable pencil topper or a connector for cylindrical objects that has some text on it. I want it to be like a little triangular hat that slides onto a pencil or rod.

Here's what I'm thinking:

**Shape and Structure:**

*   **Basic Shape:** The main structure will be a triangular prism. So, imagine a triangle extruded along its normal.
*   **Hole:** Inside the triangle, I need a circular hole so it can slide onto a pencil or dowel. The inner diameter of this hole should be adjustable.
*   **Rounded Corners:** I'd like the corners of the triangle to be rounded to make it more comfortable and less likely to catch on things. This should be a parameter to control the roundness.

**Text/Labels:**
*   **Placement:** I want to have three separate text messages printed on the outside of the prism, one along each face of the triangle. The text should be facing outwards, away from the center of the triangle.
*   **Customization:** Each of these three text messages should be customizable, so I can choose the wording of each label.
*   **Font:** The font should be selectable, I'd like to use a .dxf font file using the Write library
*   **Text Height:** The height of the letters should be proportional to the inner diameter. I want the letters to be big enough so they can be easily read.

**Parameters:**

I'd need the following parameters to be adjustable:
*   `pencil_diameter`: The diameter of the cylinder the topper will be attached to. This will control the diameter of the inner hole.
*   `thickness`: The thickness of the wall of the triangular prism itself.
*   `corner_radius`: The radius of the rounded corners on the triangle.
*   `length`: The length of the extrusion, that is the length of the topper along the axis of the hole.
*   `message_1`: The text for the first face.
*   `message_2`: The text for the second face.
*   `message_3`: The text for the third face.
*   `Font`: The .dxf file to use for the text, I want to use the `write/Write.scad` library.

**Overall:**
Basically, I want a parametric design where I can specify the size of the hole, the thickness of the walls, the roundness of the corners, and three different text messages to be printed on the faces of the triangle. I want the text to be adjustable and scaled to the size of the object using a font from `write/Write.scad`. The Write library needs to be available in the directory, I do not need the file to be sent.

Could you create an OpenSCAD file for this?

[Assistant]
pencil_hat.scad:
```
//pencil hat, could be used to attach to any round stuff needs mark
//by allenZ
//CC BY-NC-SA
//http://www.thingiverse.com/thing:59175

include <write/Write.scad>

//start of parameters
message_1 = "Live";
message_2 = "Laugh";
message_3 = "Love";
Font = "write/orbitron.dxf";//["write/Letters.dxf":Basic,"write/orbitron.dxf":Futuristic,"write/braille.dxf":Braille]

pencil_diameter = 8;

thickness =2;

corner_radius =2;

length = 4;

//End of parameters

module triangle (radius=1) {
polygon(points=[[radius/sin(30),0],[-radius,(radius/sin(30)+radius)/tan(60)],[-radius,-(radius/sin(30)+radius)/tan(60)]], paths=[[0,1,2]]);
}

module roundcorner(r,a) {
l=r/sin(a/2);
difference () {
polygon(points=[[0,0],[r*sin(a/2),r*cos(a/2)],[l,0],[r*sin(a/2),-r*cos(a/2)]], paths=[[0,1,2,3]]);
circle(r=r,$fn=100);
}
}

module label(label,t) {
translate ([p_radius+thickness,0,total_length/2])
rotate ([0,90,0])
translate ([0,0,t/2])
write(label,t=t, h=font_size, center = true, font = Font);
}

font_size = pencil_diameter;

total_length = max( (max (len(message_1),len(message_2),len(message_3))+1)*pencil_diameter*0.7, length);

p_radius = pencil_diameter/2;

rotate ([0,0,60])
label(message_1,t);
rotate ([0,0,180])
label(message_2,t);
rotate ([0,0,300])
label(message_3,t);

linear_extrude(height = total_length)
difference() {
triangle(p_radius+thickness);
for (i=[0:2]) {
rotate ([0,0,i*120])
translate ([(p_radius+thickness)/sin(30)-corner_radius/sin(30)+0.01,0,0]) roundcorner(corner_radius,60);
circle (p_radius,$fn=20);
}
}

```


[User]
Okay, I'd like to create a customizable 3D model that represents text in binary. I've got some specific ideas about how I want it to look and be configurable.

Here's what I'm imagining:

**Basic Structure:**

*   **Text Input:** The design should take text as input, like "JS" or "42".
*   **Binary Conversion:** Each character of the input text should be converted into its 7-bit or 8-bit ASCII binary representation. (It would be cool if there was an option to add an extra zero to force 8 bits, just because).
*   **Bit Arrangement:** The binary for each character should form a row. If the text has multiple characters, the bits will be stacked on top of each other to create a grid pattern. Bits should be written either left-to-right or right-to-left, selectable by a flag.
*   **Bit Representation:** Each bit (0 or 1) should be represented by a 3D shape. These should be configurable.
*   **Base:** The rows of bits should sit on a base with a configurable style.
*   **Bail (Hanger):** The design needs a bail (a loop or hook for attaching it to a necklace or keychain). This should be configurable too, and there should be an option to have no bail.

**Parameters I want to control:**

*   **`text`:** The string of ASCII characters to convert to binary.
*   **`bit_style`:** The shape to represent each bit. I'd like options like:
    *   "bevel": A beveled cube.
    *   "flat": A simple cube.
    *   "circle": A cylinder with rounded ends
    *   "hexagon": A hexagonal cylinder with rounded ends.
    *  "round": A rounded cube (using minkowski)
*   **`base_style`:** The style for the base. I'd like at least "bevel" and "flat" options.
*   **`bit_size`:**  A percentage representing how large the bit shapes should be. I think it would be useful to have a scaling factor applied to a basic size.
*   **`base_length`:** The length in mm of the overall base. This will determine the overall size of the piece
*   **`bail`:** The position of the bail. Options should be "side", "top", and "none".
*   **`bail_size`:**  A percentage value determining how large the bail should be.
*  **`reverse_bit_direction`:** A boolean or string to choose whether the bits are written from right to left or left to right
*  **`extra_bit`:**  A flag or string to specify whether the binary representation for each letter should be 7 bits (standard) or 8 (with an extra zero in front)

**OpenSCAD Requirements:**

*   The design should be parametric using OpenSCAD.
*   I'd like to see all code, even for very simple shapes, so that I can get a better idea of how it all fits together.
*   I'd rather not use code external libraries if possible. I'm ok with you using built-in functions.

**Example:**

Let's say I input "JS", with `bit_style="bevel"`, `base_style="bevel"`, `bit_size=100`, `base_length=70`, `bail="side"`, `bail_size=100`, `reverse_bit_direction="no"`, and `extra_bit="no"`. The output would have the binary representation of 'J' on the top line and 'S' on the line below, with each bit a beveled cube. The text would be left-aligned and have a beveled base, with a bail on the right side of the shape.

I think that's it. Can you create an OpenSCAD file that meets those specifications?

[Assistant]
bitify.scad:
```
//Characters to convert to bits
text = "JS";

bit_style = "bevel"; //[bevel,flat,circle,hexagon,round]

base_style = "bevel"; //[bevel,flat]

//%
bit_size = 100; // [50:150]

//(in mm)
base_length = 70; //	[40:150]

bail = "side";	//[side,top,none]

//%
bail_size = 100; //[50:150]

//If yes, bits will be written from right to left
reverse_bit_direction = "no"; //[no,yes]

//Add an extra zero to make a whole byte, you know, as God intended.
extra_bit = "no"; //[no,yes]

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

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

TXT= text;

HEIGHT=.5*1;
BITMODE = bit_style;
BASEMODE = base_style;
BITSCALE = 1.4*bit_size/100;
NBITS=	extra_bit == "yes" ? 8 : 7;
NCHARS=len(TXT);
REVERSEBITS = reverse_bit_direction == "yes";
PENDENT=bail;
PENDENTSCALE = 1.5*bail_size/100;
SIZEMMS = base_length;

module simple_innie_outie() {
	union() {
		difference() {
			basis();
			allzeros();
		}
		allones();
	}
}

module allones() {
	for (i=[0:NCHARS-1]) {
		translate([0,line_position_y(i)]) ones(char2bits(TXT[i]));
	}
}

module allzeros() {
	for (i=[0:NCHARS-1]) {
		translate([0,line_position_y(i)]) zeros(char2bits(TXT[i]));
	}
}

module zeros(bits) {
	for (i=[0:NBITS-1]) {
		if (bits[i]=="0") {
			translate([bit_position_x(i),0,HEIGHT-0.01]) scale([BITSCALE,BITSCALE,HEIGHT]) bit();
		}
	}
}

module ones(bits) {
	for (i=[0:NBITS-1]) {
		if (bits[i]=="1") {
			translate([bit_position_x(i),0,HEIGHT-0.01]) scale([BITSCALE,BITSCALE,HEIGHT]) bit();
		}
	}
}

module bit() {
	if (BITMODE=="flat") {
		cube([1,1,1],center=true);

	} else if (BITMODE=="circle") {
		hull() {
		cylinder(r1=.5,r2=.4,h=0.5,center=false,$fn=30);
		translate([0,0,-.5]) cylinder(r1=.4,r2=.5,h=0.5,center=false,$fn=30);
		}

	} else if (BITMODE=="round") {
		translate([-0.2,-0.2,-0.5])
		minkowski() {
			cube([0.4,0.4,.5]);
			cylinder(r=0.3,h=.5,$fn=20);
		}
	} else if (BITMODE=="bevel") {
		translate([-0.5,-0.5,-0.5]) makebevel(1,1,1,.4);

	} else if (BITMODE=="hexagon") {
		hull() {
		cylinder(r1=.5,r2=.4,h=0.5,center=false,$fn=6);
		translate([0,0,-.5]) cylinder(r1=.4,r2=.5,h=0.5,center=false,$fn=6);
		}
	}
}

module makebevel(sx,sy,sz,r) {
	hull() {
		translate([r, 		r, 		r 	]) sphere(r=r,$fn=20);
		translate([sx-r,	r, 		r 	]) sphere(r=r,$fn=20);
		translate([r, 		sy-r,	r 	]) sphere(r=r,$fn=20);
		translate([sx-r,	sy-r,	r 	]) sphere(r=r,$fn=20);
		translate([r, 		r, 		sz-r]) sphere(r=r,$fn=20);
		translate([sx-r,	r, 		sz-r]) sphere(r=r,$fn=20);
		translate([r, 		sy-r,	sz-r]) sphere(r=r,$fn=20);
		translate([sx-r,	sy-r,	sz-r]) sphere(r=r,$fn=20);
	}
}

module basis() {
	union() {
		if (BASEMODE == "flat") {
			cube([NBITS*2+1,NCHARS*2+1,HEIGHT]);
		} else if (BASEMODE == "bevel") {
			makebevel(NBITS*2+1,NCHARS*2+1,HEIGHT,.25);
		}
		if (PENDENT == "side") {
			translate([NBITS*2+1,(NCHARS*2+1)/2,0.01]) pendent();
		} else if (PENDENT == "top") {
			translate([(NBITS*2+1)/2,(NCHARS*2+1)-.3*PENDENTSCALE,0.01]) rotate(90) pendent();
		}

	}
}

module pendent() {
	scale([PENDENTSCALE,PENDENTSCALE,.3])
	translate([0,0,HEIGHT/2])
	difference() {
		cube([2,1,HEIGHT],center=true);
		cube([1.6,.6,HEIGHT*3],center=true);
	}
}

function bit_position_x(i) = REVERSEBITS? 1 + (NBITS-1 -i)*2 + 0.5: 1 + i*2 + 0.5 ;
function line_position_y(i) = 1.5 + (NCHARS-1-i)*2;

ascii_table= [[" ","0100000"],["!","0100001"],["\"","0100010"],["#","0100011"],["$","0100100"],["%","0100101"],["&","0100110"],["'","0100111"],["(","0101000"],[")","0101001"],["*","0101010"],["+","0101011"],[",","0101100"],["-","0101101"],[".","0101110"],["/","0101111"],["0","0110000"],["1","0110001"],["2","0110010"],["3","0110011"],["4","0110100"],["5","0110101"],["6","0110110"],["7","0110111"],["8","0111000"],["9","0111001"],[":","0111010"],[";","0111011"],["<","0111100"],["=","0111101"],[">","0111110"],["?","0111111"],["@","1000000"],["A","1000001"],["B","1000010"],["C","1000011"],["D","1000100"],["E","1000101"],["F","1000110"],["G","1000111"],["H","1001000"],["I","1001001"],["J","1001010"],["K","1001011"],["L","1001100"],["M","1001101"],["N","1001110"],["O","1001111"],["P","1010000"],["Q","1010001"],["R","1010010"],["S","1010011"],["T","1010100"],["U","1010101"],["V","1010110"],["W","1010111"],["X","1011000"],["Y","1011001"],["Z","1011010"],["[","1011011"],["\\","1011100"],["]","1011101"],["^","1011110"],["_","1011111"],["`","1100000"],["a","1100001"],["b","1100010"],["c","1100011"],["d","1100100"],["e","1100101"],["f","1100110"],["g","1100111"],["h","1101000"],["i","1101001"],["j","1101010"],["k","1101011"],["l","1101100"],["m","1101101"],["n","1101110"],["o","1101111"],["p","1110000"],["q","1110001"],["r","1110010"],["s","1110011"],["t","1110100"],["u","1110101"],["v","1110110"],["w","1110111"],["x","1111000"],["y","1111001"],["z","1111010"],["{","1111011"],["|","1111100"],["}","1111101"],["~","1111110"]];

function char2bits(c) = str(NBITS==8? "0" : "",ascii_table[search(c,ascii_table,0,0)[0][0]][1]);

//echo("NCHARS",NCHARS);
//echo(char2bits("a"));

scale(SIZEMMS/(NBITS*2+1))
translate([-(NBITS*2+1)/2, -(NCHARS*2+1)/2])
simple_innie_outie();

//cube([SIZEMMS,1,1]);

```


[User]
Okay, I'm trying to design a simple wire coiler in OpenSCAD, but I want it to be parametric so I can easily adjust the dimensions. I have a basic design already, and I want to expand upon it.

The core idea is that the coiler is essentially a cylinder. I want to define the radius of the cylinder as the main parameter. Let's call it `cylinderRadius`.

The current design has a few parts:
1.  An "inner" cylinder, which is the main body where the wire will go. Its radius is `cylinderRadius` and it's 5 units tall.
2.  Two "outer" rings (or disks) that sit at the top and bottom of the cylinder, slightly wider (radius is `cylinderRadius + 3`) and 1 unit tall. These form the flanges.
3.  A hole that runs through the center with a radius of `cylinderRadius - 4` and is 10 units tall. This forms the hole that would go on a shaft to hold the coiler steady. It's positioned to make the hole centered and also to make it pass through the flanges.

I'd like to make the following changes:
*   I want to be able to parameterize the height of the main cylinder body. Let's call it `cylinderHeight`. Currently, this is hardcoded to 5.
*   I want to be able to parameterize the thickness of the outer rings. Currently, this is hardcoded to 1. Let's call it `ringThickness`.
*   I want to be able to parameterize the added radius for the outer rings, which is currently hardcoded to 3. Let's call it `ringRadiusOffset`.
*   I want to parameterize the radius of the hole that runs through the center and the height of the hole. The radius is currently `cylinderRadius - 4`. Let's call this `holeRadius` and the height `holeHeight`.
*   I want to add a parameter that controls the overall vertical offset of the outer rings relative to the main cylinder. Let's call it `ringVerticalOffset`, where the rings are currently 1 unit above and below the body, with the body having z-position from 0 to `cylinderHeight`.

I would also like to ensure that the code is well commented and easy to understand. Please provide the OpenSCAD code as a result of this request.

[Assistant]
Wire_Coiler.scad:
```
// How big you want your coiler to be
cylinderRadius = 15;

module outer() {
	translate([0, 0, -1]) cylinder(r = cylinderRadius + 3, h = 1);
	translate([0, 0, 5]) cylinder(r = cylinderRadius + 3, h = 1);
}

module inner() {
	cylinder(r = cylinderRadius, h = 5);
}

difference() {
	union() {
		outer();
		inner();
	}
	translate([0, 0, -3]) cylinder(r = cylinderRadius - 4, h = 10);
}
```


[User]
Okay, I'd like to design a decorative spiral tree in OpenSCAD, similar to the one I saw on Thingiverse (thing:59270). I'm looking for a design that's fully parametric so I can easily adjust its size and shape.

Here's a breakdown of what I have in mind:

**Core Structure:**

*   **Spiral Rings:** The main feature is a spiral composed of flat, circular rings that get progressively smaller as they spiral upwards.
*   **Center Post:** There should be a cylindrical center post that the spiral rings are effectively wrapped around. This should be extendable both above and below the bottom-most spiral.
*   **Base:** The base of the center post should have a wider cylinder section to provide stability, transitioning back to the standard post diameter to extend downwards.

**Parameters:**

I'd like to be able to control the following:

*   `diameter`: The overall outside diameter of the spiral at its widest point.
*   `thickness`: The thickness of each individual spiral ring.
*   `height`: The vertical height of each spiral ring.
*   `gap`: The vertical gap between consecutive spiral rings.
*   `postDiameter`: The diameter of the center post.
*   `postHeight`: The overall height of the center post. This should be longer than the height of the spiral to allow for a small amount of post extending above the top spiral, and an optional base below the bottom spiral (which is handled by the variable base height)
*  `baseHeight`: A base height that is added below the lowest spiral in the post (via a wide base cylinder).
*   `resolution`: The number of angle steps used to generate the spiral's shape. A higher number results in a smoother spiral. I also would like this parameter to effect the number of slices (segments) in the center post and base, so this value should be used for the `$fn` setting for all cylinder parts.
*   `revolutions`: the number of revolutions the spiral makes. If the computed number of revolutions exceeds a provided parameter, the user-supplied value will be used.

**Additional Requirements:**

*   **Variable Angular Resolution:** I understand that using a fixed angular resolution for the entire spiral can be inefficient, especially towards the center. Ideally, the code would dynamically reduce resolution as the radius of the spiral reduces. I'm not sure how to implement that, but it would be great if the design had it.
*   **Unit:** Millimeters

**Libraries:**

I don't think I need any specific libraries for this, as it seems like it can be done with OpenSCAD's core functions.

Could you provide an OpenSCAD file that implements this design with all of the parameters and requirements above? Thanks!

[Assistant]
Spiral_Tree_v1-2.scad:
```

// outside diameter of the spiral
_diameter = 60; //[5:300]

// thickness of each ring of the spiral
_thickness = 1.0;

// height of the spiral rings
_height = 0.8;

// gap between the spiral rings
_gap = 0.3;

// diameter of center post
_postDiameter = 4;

// height of center post with tree spirals
_postHeight = 50;

// number of angle steps around the circle
_resolution = 60; //[3:180]

function radiusAt(radius, angle, pitch) = radius - pitch * (angle/360);

module spiral(revolutions, diameter, thickness, height, gap, resolution) {
	radius = diameter/2;
	revolutions = min(revolutions, radius/(thickness+gap)-1);
	pitch = thickness + gap;
	angleStep = 360/round(resolution);
	eps = 0.2;

	union() {
		for (angle = [0:angleStep:360*revolutions-angleStep]) {
			assign(	r0 = radiusAt(radius, angle, pitch),
						r1 = radiusAt(radius, angle+angleStep, pitch),
						r2 = radiusAt(radius-thickness, angle+angleStep, pitch),
						r3 = radiusAt(radius-thickness, angle, pitch)
						) {
				linear_extrude(height = height, slices = 1) {
					polygon(	points=[	[r0*sin(angle),r0*cos(angle)],
											[r1*sin(angle+angleStep),r1*cos(angle+angleStep)],
											[r2*sin(angle+angleStep+eps),r2*cos(angle+angleStep+eps)],
											[r3*sin(angle-eps),r3*cos(angle-eps)] ],
								paths=[[0,1,2,3]]);
				}
			}
		}
	}
}

module make(diameter, thickness, height, gap, postDiameter, postHeight, resolution) {
	revolutions = (diameter/2)/(thickness+gap);
	postRadius = postDiameter/2;
	// fixed angular resolution is inefficient, resolution of the spiral should be variable, lower angular resolution in the center
	treeHeight = max(postHeight, postDiameter*3 + height*2);
	treeBase = thickness;
	eps = 0.1;

	union() {
		spiral(revolutions, diameter, thickness, height, gap, resolution);
		cylinder(r=postRadius, h=treeHeight, $fn=30);
		hull() {
			translate([0,0,treeHeight - treeBase/2]) {
				cylinder(r=postRadius*3, h=treeBase, $fn=30);
			}
			translate([0,0,treeHeight - treeBase - postDiameter*3]) {
				cylinder(r=postRadius, h=eps, $fn=30);
			}
		}
	}
}

make(_diameter, _thickness, _height, _gap, _postDiameter, _postHeight, _resolution);

// todo:
// fix angular resolution issue
// add magenetic attachment option
```


[User]
Okay, I'd like to design a customizable bathroom accessory, kind of like a tray that can also function as a clip. I'm using the `utils/build_plate.scad` file for build plate previews, so keep that in mind.

Here's what I'm thinking:

**Overall Functionality:**
I want the design to be able to function as a clip, a soap tray/bowl, or a shower tray depending on the user's choice.

**Customization:**
I need a few main customizable features, controlled by variables:

*   **`your_thing`**: This will be an integer to select between the three options:
    *   `1` for a clip,
    *   `2` for a soap tray/bowl,
    *   `3` for a shower tray which incorporates the clip and the tray.

*   **`tray_width_corners`**: A boolean (represented as an integer, `1` for YES, `2` for NO) to control whether the tray has rounded corners or not.
*   **`tray_width`**: The width of the tray in centimeters (minimum 3cm, maximum 50cm).
*   **`tray_length`**: The length of the tray in centimeters (minimum 3cm, maximum 50cm).
*   **`tray_height`**: The height of the tray in centimeters (minimum 0.225cm).
*   **`diameter_bar`**: The diameter of the shower bar (or whatever bar the clip will attach to) in millimeters (minimum 5mm, maximum 50mm).
*   **`height_clip`**: The height of the main part of the clip in centimeters.
*   **`height_cylinders`**: The height of the two cylinders of the clip in centimeters.
*   **`pattern_shape`**: An integer to select the shape of the honeycomb pattern used for the tray's base. It will have options for triangles (3 sides), squares (4 sides), pentagons (5 sides), hexagons (6 sides), heptagons (7 sides), octagons (8 sides), nonagons (9 sides), decagons (10 sides), hendecagons (11 sides), dodecagons (12 sides) and circles (30 sided).
*   **`pattern_radius`**: The radius of the honeycomb pattern cells in millimeters.
*  **`pattern_overlap`**: The overlap percentage of the pattern in the range from 0 to 100.
*   **`pattern_rotation`**: The rotation of the pattern in degrees.
*   **`pattern_thickness`**: The thickness of the pattern walls in 0.4mm increments.

**Specific Design Elements:**

*   **Clip:** The clip will have a main cylindrical body with two smaller cylinders extending from it, designed to grip the bar.  There should be an opening on one side that allows it to clip around a bar.
*   **Tray/Bowl:** The tray will be rectangular with optional rounded corners. It will have a flat base and a small wall around the perimeter.
*   **Shower Tray:** If the user selects shower tray, the clip will be attached to the tray.
*  **Honeycomb Pattern:** The tray (and shower tray) should have a honeycomb pattern on the base. The shape of the pattern is defined by `pattern_shape`, radius with `pattern_radius` the overlap with `pattern_overlap` and its rotation with `pattern_rotation` and line thickness of the walls with `pattern_thickness`.

**Units & Scaling:**
*   I'm using centimeters as the primary unit for the tray dimensions and the clip heights, and millimeters for the bar diameter and pattern elements. You'll need to scale units accordingly with a constant such as `cm_faktor=10` for conversion.
*   Wall thickness should be derived from a constant, for example `wall_thickness=0.4*cm_faktor;`.

**Key Modules:**
*   I'll need a `bar_clip()` module, a `roundedrectangle()` module for the tray with optional round corners, a `tray()` module, a `honeycomb()` module for the pattern, and a `pattern()` module to apply the pattern to the tray.
*   The `bar_clip` module takes the heights of the main cylinder and the two smaller cylinders, the radius of the bar and the radius of the cylinders.
*   The `roundedrectangle` module takes the width, length and height of the rectangle and the radius of the cylinders which create the rounded corners.
*   The `tray()` module takes width, length and height.
*   The `honeycomb` module will need width, length, height, the radius of a cell, the overlap modifier, the line thickness and number of sides.
*   The `pattern` module should apply the honeycomb to the tray.

Essentially, I want to recreate the functionality of the provided file with the same logic and modules, but I'm requesting a clean implementation from scratch. Please make sure to also add comments to the code.

Please provide the OpenSCAD code based on these specifications. I am not providing any additional .scad files, outside of `utils/build_plate.scad`.

[Assistant]
customizable_bathroom_accessory.scad:
```
use <utils/build_plate.scad>

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

/*Customizer Variables*/

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

your_thing = 3; // [1:Clip,2:Soap Tray/Bowl,3:Shower Tray]
tray_width_corners = 1; // [1:YES,2:NO]
//Width of the tray in cm   min:3  max:50
tray_width=7.5;
//Length of the tray in cm  min:3 max:50
tray_length=4;
//Height of the tray in cm min:0.225
tray_height=1.75;
//Diameter of your bar in mm min:5 max:50
diameter_bar=19.25;
//Height of the main part of the clip in cm
height_clip=1.75;
//Height of the two cylinders in cm
height_cylinders=2.15;

pattern_shape = 6; //[3:Triangle (3-sided),4:Square (4-sided),5:Pentagon (5-sided),6:Hexagon (6-sided),7:Heptagon (7-sided),8:Octogon (8-sided),9:Nonagon (9-sided),10:Decagon (10-sided),11:Hendecagon (11-sided),12:Dodecagon (12-sided),30:Circle (30-sided)]
//in mm:
pattern_radius = 8; //[4:22]
pattern_overlap = 15; //[0:100]
//in degrees:
pattern_rotation = 0; //[0:180]
//in .4 mm increments:
pattern_thickness = 4; //[2:30]

/*Non customizer variables*/

honeycomb_radius = pattern_radius;
honeycomb_radius_modifier = pattern_overlap;

honeycomb_sides = pattern_shape;

honeycomb_rotation = pattern_rotation;

line_thickness = pattern_thickness;
honeycomb_thickness = line_thickness*.4;

//Constants
cm_faktor=10;
wall_thickness=0.4*cm_faktor;
r_c=2.02; // radian of the two small cylinders

// Variables for shower tray
w=tray_width*cm_faktor;
l=tray_length*cm_faktor;
h_t=tray_height*cm_faktor;
corner=tray_width_corners; //if 0 then cube else cube_rounded
pattern_width=w*4;
pattern_length=l*4;
pattern_height=9.34/1;

//Variables for bar_clip
h_e1=height_clip*cm_faktor; // height of the main cylinder
h_e2=height_cylinders*cm_faktor; // height of the two small cylinders
d=diameter_bar/2; //diameter of the bar in mm

build_plate(build_plate_selector);

if (your_thing==1)
{
 bar_clip(h_e1,h_e2,d,r_c);
}
else if (your_thing==2)
{
 union()
{
tray(w,l,h_t);
pattern();
}

}
else if (your_thing==3)
{
union(){
 union()
{
bar_clip(h_e1,h_e2,d,r_c);
tray(w,l,h_t);
}
pattern();
}

}

module bar_clip(h1,h2,r1,r2)
{
translate([0,r1+0.2,0])union()
{
	difference()
	{
		difference()
		{
			cylinder(h1,r1+2.5,r1+2.5);
			translate([0,0,-1])cylinder(h1+2,r1,r1);
		}

		translate([-r1*2,r1*0.6,-1])cube([r1*4,r1*2,h1+2]);
	}

	rotate([0,0,35])translate([r1+1.25,0,0])cylinder(h2,r2,r2);
	rotate([0,0,145])translate([r1+1.25,0,0])cylinder(h2,r2,r2);
}
}

module roundedrectangle(width,length,height,r1)
{

module cross()
{
	union()
	{
	translate([0,r1,0])cube([width,length-(r1*2),height]);
	translate([r1,0,0])cube([width-(r1*2),length,height]);
	}
}

union()
{
cross();
translate([r1,r1,0])cylinder(height,r1,r1);
translate([width-r1,r1,0])cylinder(height,r1,r1);
translate([r1,length-r1,0])cylinder(height,r1,r1);
translate([width-r1,length-r1,0])cylinder(height,r1,r1);
}
}

module tray(width,length,height)
{
difference()
{

if (corner==2)
{
	translate([-(width+wall_thickness*2)/2,-(length+wall_thickness*2),0])cube([width+wall_thickness*2,length+wall_thickness*2,height]);
} else {
	translate([-(width+wall_thickness*2)/2,-(length+wall_thickness*2),0])roundedrectangle(width+wall_thickness*2,length+wall_thickness*2,height,1.75);
}

translate([-width/2,-length-wall_thickness,-1])cube([width,length,height+2]);

}
}

module honeycomb(w,l,h,r,rmod,th,sides){

	columns = l/(r*3)+1;
	rows = w/(r*sqrt(3)/2*2);

	translate([-w/2,l/2,0])
		rotate([0,0,-90])
			for(i = [0:rows]){

				translate([0,r*sqrt(3)/2*i*2,0])
				//scale([1*(1+(i/10)),1,1])
					for(i = [0:columns]){
						translate([r*i*3,0,0])
							for(i = [0:1]){
								translate([r*1.5*i,r*sqrt(3)/2*i,0])
									rotate([0,0,honeycomb_rotation])
									difference(){
										if(sides < 5){
											cylinder(height = h, r = r+th+(r*rmod/50), center = true, $fn = sides);
										} else {
											cylinder(height = h, r = r+(r*rmod/50), center = true, $fn = sides);
										}
										cylinder(height = h+1, r = r-th+(r*rmod/50), center = true, $fn = sides);
									}
							}
					}
			}
}

module pattern(){

translate([0,0,-2.4])difference()
{
union()
{
	intersection()
		{
		translate([-(w+wall_thickness)/2,-(l+wall_thickness+0.5*wall_thickness),0])cube([w+wall_thickness,l+wall_thickness,4.8]);
		scale([1,1,10])honeycomb(pattern_width,pattern_length,pattern_height,honeycomb_radius,honeycomb_radius_modifier,honeycomb_thickness,honeycomb_sides);
		}
}
translate([-(w+wall_thickness+0.1)/2,-(l+wall_thickness+0.5*wall_thickness)-0.05,-0.1])cube([w+wall_thickness+0.1,l+wall_thickness+0.1,2.5]);
}

}

```


[User]
Okay, I'm looking for a design for a customizable box with magnetic hinges and a magnetic closure. I've seen some examples online, and I like the idea of using cylindrical magnets for both the hinge mechanism and to keep the box closed.

I need an OpenSCAD file that will let me adjust the following:

*   **Overall Dimensions:** I need to be able to set the width, length, and height of the box.
*   **Corner Rounding:** I want to be able to specify a radius for rounding the corners of the box.
*   **Wall Thicknesses:** I need to control the minimum wall thickness around the magnets, the thickness of the side walls (not the hinge area), and the thickness of the top/bottom.
*   **Magnet Dimensions:** I should be able to set the diameter and height of the magnets I will be using.
*   **Hinge Gap:** I need to be able to adjust the small gap between the box and lid where the hinge connects. This is important for fit.
*   **Part Generation:** I need to be able to choose whether I want to generate just the box or just the lid.

The magnets will be inserted into matching circular cutouts, so the design needs to include the corresponding recesses for the magnets in both the lid and box parts of the hinge. The magnets in the lid and box will need to align correctly to form the hinge. Also, the magnets that hold the lid closed will need to be aligned as well when the lid is closed. The hinges should use 2 magnets each. I'd prefer to have the option to only generate the box or the lid so I can print them separately.

The general style should be relatively simple, like a rounded rectangular prism, with the magnetic hinges located on one of the longer sides.

I'm using OpenSCAD, and I do want to use the `build_plate` module from the `utils` library.

[Assistant]
Magnetic_Hinge_Box_v1-0.scad:
```
use <utils/build_plate.scad>

_part = "box"; // [box, lid]

// width of the box (affects the length of the hinges)
_width = 36; // [10:300]

// length of the box
_length = 36; // [10:300]

// height of the box
_height = 12; // [4:300]

// rounding radius of the corners of the box
_rounding = 4; // [1:50]

// thickness of the walls around the magnets
_minimumWallThickness = 0.8;

// thickness of the side walls without the hinge
_sidewallThickness = 0.8;

// thickness of the bottom of the box or the top of the lid
_horizontalThickness = 0.8;

// diameter of magnets in the hinge
_magnetDiameter = 3.2;

// height magnets in the hinge
_magnetHeight = 3.2;

// gap bewteen the lid and box parts
_hingeGap = 0.2;

module roundRect(width, depth, height, round) {
	round = min(round, width/2);
	hull() {
		for (w=[-1,1])
		for (d=[-1,1])
		translate([w * (width/2 - round),d * (depth/2 - round),0]) {
			cylinder(r=round, h=height, center=true);
		}
	}
}

module makeBase(width, depth, height, rounding, minimum, side, bottom, mdiameter, mheight, gap) {
	eps = 0.1;
	iwidth = width - side*2;
	idepth = depth - mdiameter*2 - minimum*4;
	hingeCutZ = mdiameter + minimum*2 + gap;
	hingeCutWidth = width - rounding*2 - mheight*2;
	fillet = mdiameter/2 + minimum;

	difference() {
		translate([0,0,height/2]) {
			difference() {
				roundRect(width, depth, height, rounding);
				translate([0,0,bottom]) {
					roundRect(iwidth, idepth, height, rounding-side);
				}
			}
		}

		// hinge cutout
		translate([0,0,height - hingeCutZ/2 + eps/2]) {
			cube(size=[hingeCutWidth, depth+eps, hingeCutZ + eps], center=true);
		}

		// fillet edges
		for (y=[-1,1]) {
			translate([0,y*(depth/2 - fillet/2),height - fillet/2]) {
				difference() {
					cube(size=[width+eps, fillet+eps, fillet+eps], center=true);
					translate([0,y*-fillet/2,-fillet/2])
					rotate([0,90,0]) {
						cylinder(r=fillet, h=width + eps*2, center=true);
					}
				}
			}
		}
		// magnet cutouts
		for (x=[-1,1])
		for (y=[-1,1]) {
			translate([x * (hingeCutWidth/2 + mheight/2 - eps/2), y*(depth/2 - minimum - mdiameter/2), height - minimum - mdiameter/2])
			rotate([0,90,0])
			cylinder(r=mdiameter/2, h=mheight+eps, center=true, $fn=30);
		}
	}
}

module makeLid(width, depth, rounding, minimum, side, bottom, mdiameter, mheight, gap) {
	eps = 0.1;
	hingeWidth = width - rounding*2 - mheight*2 - gap*2;
	hingeSize = mdiameter + minimum*2;

	difference() {
		union() {
			translate([0,0,bottom/2]) {
				roundRect(width, depth, bottom, rounding);
			}

			// hinges
			for (s=[-1,1]) {
				translate([0,s*(depth/2 - hingeSize/2),bottom + hingeSize/2]) {
					hull() {
						rotate([0,90,0]) {
							cylinder(r=hingeSize/2, h=hingeWidth,center=true);
						}
						translate([0,s*-hingeSize/4,0]) {
							cube(size=[hingeWidth, hingeSize/2, hingeSize], center=true);
						}
						translate([0,0,-hingeSize/4-eps]) {
							cube(size=[hingeWidth, hingeSize, hingeSize/2], center=true);
						}
					}
				}
			}
		}

		// magnet cutouts
		for (x=[-1,1])
		for (y=[-1,1]) {
			translate([x * (hingeWidth/2 - mheight/2 + eps/2), y*(depth/2 - minimum - mdiameter/2), mdiameter/2 + bottom + minimum])
			rotate([0,90,0])
			cylinder(r=mdiameter/2, h=mheight+eps, center=true, $fn=30);
		}

	}
}

module make($fn=60) {
	// minimal error checking
	eps = 0.1;
	rounding = max(_rounding, _sidewallThickness + eps);
	height = max(_height, _horizontalThickness + _magnetDiameter + _minimumWallThickness*2 + _hingeGap);

	if (_part == "box") {
		makeBase(_width, _length, height, rounding,
					_minimumWallThickness, _sidewallThickness, _horizontalThickness,
					_magnetDiameter, _magnetHeight, _hingeGap);
	} else if (_part == "lid") {
		makeLid(_width, _length, rounding,
					_minimumWallThickness, _sidewallThickness, _horizontalThickness,
					_magnetDiameter, _magnetHeight, _hingeGap);

	}

}

build_plate(0);
make();

```


[User]
Okay, I need a custom filament clip designed in OpenSCAD. I'm tired of the generic ones that never quite fit my spools and filament correctly.

Here's what I'm looking for:

The clip should have two "arms" that extend out and then curve around to clip onto the spool. It also needs a little area that grips the filament to keep it from unraveling. The design should be fully parametric so I can easily adjust it for different filament diameters, spool thicknesses (with or without a rim!), and even the length and width of the clip itself.

Specifically, the parameters I'd like to control are:

*   **Filament Diameter:** The diameter of the filament being used.
*   **Spool Thickness:** The thickness of the spool itself, not including any rim.
*   **Spool Rim Thickness:** The thickness or height of any rim that sticks out from the edge of the spool (if any). If there's no rim, this can be zero.
*   **Arm Length:** How long the straight "arms" of the clip should be.
*   **Clip Width:** The width of the clip (the dimension along the spool axis).
*   **Clip Thickness:** How thick the clip is (the dimension perpendicular to both the spool and the arms).

The clip should look something like this (imagine a simplified drawing here):

*   Two rectangular arms coming off the base of the cylinder.
*   These arms transition into a curved part that wraps around the spool edge. This part should hug the spool tightly.
*   On one side (preferably the one opposite the spool edge), there's a little cube-shaped feature extending out with a small cylindrical cutout in it to grip the filament.

Also, the part that grips the filament should not extend below the bottom of the clip, so it sits flat on a surface.

I don't need it to be super fancy but I do need it to work well.

I think this could be done with simple OpenSCAD primitives and unions, differences, and translations. I don't think I need to use any special libraries, but if you have a standard one that does all of the standard primitives in a cleaner format, like dotSCAD, that would be great.

[Assistant]
Filament_Clip.scad:
```
//Customizable Filament Clip by Dealmann

//Diameter of your filament.
fc_filament=3;

//Thickness of your spool.
fc_spool=2;

//In case your spool has a rim.
fc_rim=0;

//Length of the clips "arms".
fc_length=10;

//Width of the clip.
fc_width=3;

//Thickness of the clip.
fc_thickness=2;

difference()
	{
		union()
			{
				cube([fc_thickness, fc_length, fc_width]);

				translate([fc_thickness+fc_rim+fc_spool+1, 0, 0])
				cube([fc_thickness, fc_length, fc_width]);

				translate([fc_thickness+(fc_rim+fc_spool+1)/2, fc_length,0])
				cylinder(r=fc_thickness+(fc_rim+fc_spool+1)/2, h=fc_width, $fn=24);

				difference()
					{
						translate([fc_thickness,0.5+fc_rim/2+fc_spool*0.05,0])
						cylinder(r=0.5+fc_rim/2+fc_spool*0.05,h=fc_width, $fn=24);

						translate([fc_thickness-(0.5+fc_rim/2+fc_spool*0.05+1),0,-1])
						cube([0.5+fc_rim/2+fc_spool*0.05+1,(0.5+fc_rim/2+fc_spool*0.05)*2,fc_width+2]);
					}

				difference()
					{
						translate([fc_thickness+fc_rim+fc_spool+1,0.5+fc_rim/2+fc_spool*0.05,0])
						cylinder(r=0.5+fc_rim/2+fc_spool*0.05,h=fc_width, $fn=24);

						translate([fc_thickness+fc_rim+fc_spool+1,0,-1])
						cube([0.5+fc_rim/2+fc_spool*0.05+1,(0.5+fc_rim/2+fc_spool*0.05)*2,fc_width+2]);

					}

				translate([-fc_filament*1.5,fc_length-(fc_filament+2),0])
				cube([fc_filament*1.5,fc_filament+2,fc_width]);

			}
		translate([fc_thickness+(fc_rim+fc_spool+1)/2, fc_length,-1])
		cylinder(r=(fc_rim+fc_spool+1)/2, h=fc_width+2, $fn=24);

		translate([fc_thickness,fc_length-(fc_thickness+(fc_rim+fc_spool+1)/2),-1])
		cube([fc_rim+fc_spool+1, fc_thickness+(fc_rim+fc_spool+1)/2, fc_width+2]);

		translate([-fc_filament/2,fc_length-fc_filament/2-1,-1])
		cylinder(r=fc_filament/2, h=fc_width+2, $fn=24);

		translate([-fc_filament*1.5-1,fc_length-fc_filament*0.75-1,-1])
		cube([fc_filament+1,fc_filament*0.75,fc_width+2]);
	}
```


[User]
Okay, I'm looking to create a water turbine and its axel, and I'd like to use OpenSCAD. I've got some basic ideas, but I'd like you to help me generate a parametric design that's more flexible.

Essentially, I need a design that includes:

1.  **Turbine Blades (Fan):** A fan-like component with a central hub and radial blades. I'd like to be able to control the number of blades, the overall diameter and depth of the fan. I want the fan blades to be curved and not just straight wedges.

2.  **Turbine Housing (BarrelSpace):** A housing that surrounds the fan, but allows water to enter. It needs to be hollow and could be made using a rotate_extrude. I also need a through hole in the middle of this housing for the axel.

3.  **Axel:** This should have a central shaft and two larger diameter areas, one on each side of the fan blades, for securing the turbine. There should also be support structures at the top and bottom to provide stability in the assembly.

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

*   `number_of_blades`: How many blades on the turbine fan (default is 6).
*   `axel_length`: The overall length of the axel (default is 25).
*   `holeSize`: The diameter of the central hole that goes through the housing, turbine fan and axel.

I'm also using the `involute_gears.scad` library from the MCAD library. I'd like the generated code to have separate modules to control the design, so I can change and build each part. I would like a module called `form_fan` to generate the fan, `form_turbine` to make the turbine housing, and `form_axel` to generate the axel. Additionally, I would like a module called `print_part` which can select which part to build using the string variable called `part` (which can be "fan", "turbine", "axel" or "Print all"). If "Print all" is selected, it will just call every other module.

Could you help me generate this OpenSCAD code?

[Assistant]
turbine_final.scad:
```
// Which one would you like to see?
part = "fan"; // [fan,turbine,axel,Print all]

//axel_length=25: // [10:100]

number_of_blades = 6; // [2:24]
//cylinder_size = 10; // [1:100]
//number_of_wedges=8; // [2:12]

//

la=axel_length;

use <MCAD/involute_gears.scad>

print_part();

module print_part() {
	if (part == "fan") {
		form_fan();
	} else if (part == "turbine") {
		form_turbine();
	}else if (part == "axel") {
		form_axel();
	}else if (part == "Print all") {
		form_all();
	}
}

module form_fan() {
	guts();
}

module form_turbine() {
	turb();
}

module form_axel() {
	scale ([3/4*.425,3/4*.425,3/4*.425]) makeEm();
}

module form_fountain() {
	scale([4,4,4]) rotate ([90,0,0]) fount();
}

module form_float() {

	build_float_many();

}

module form_leo_bear() {
	leo_bear();
}

module form_all() {

}

module form_whole() {
//	form_turbine() ;
//	form_flountain();
//	form_float();

// Demonstrate how to make meshing bevel gears.
test_bevel_gear_pair();
}

// turbine

// variables

holeSize=5; // in mm for final print
bladeNum=number_of_blades;
// end of variables

module barr() {
	union() {
	translate ([20,10]) circle (r=10);
	scale ([]) square(20);
	}
}

module barrelSpace() {
	//	translate ([0,0,-10]) cylinder (r=32, h=10);
		translate ([0,0,-10]) rotate_extrude() barr();
		translate ([0,0,-50]) cylinder (r=holeSize*1.5, h=70);
	}

module guts() {
	intersection() {
	translate ([0,0,10]) barrelSpace();
	//translate ([0,1.5,0]) rotate ([90,0,0])  rotate_extrude(height=3) barr();
		difference () {
			union() {
				for (i = [0:bladeNum]) {
					 rotate ([0,0,360/bladeNum*i]) scale ([1,8/bladeNum,1]) fanBlade();
					}
				cylinder (r=12, h=20);
				}
			cylinder (r=holeSize*1.2, h=70, $fa=60);
	}
}
}
module fanBlade() {
	difference () {
		union() {
		translate ([0,1.5,0]) rotate ([90,0,0])  linear_extrude(height=3) barr();
		scale ([1.5,.8,1]) rotate ([0,90,-10]) translate ([-10,1,10]) sphere (8, $fa=16); // 12 -- 72
}
			scale ([1.43,.7,1]) rotate ([0,90,-10]) translate ([-10,5,10]) sphere (8, $fa=24); // 8 -- 72
			translate ([0,4.5,0]) rotate ([90,0,0])  linear_extrude(height=3) barr();
			rotate ([0,0,25]) translate ([16,-27.5-bladeNum/8,15]) cube(31, center=true);
}

}

module turbine (offset) {
		translate ([offset-2,101,0]) rotate ([90,0,0]) cylinder (r=10, h=100);
		translate ([-44,0,0]) rotate ([90,0,90]) translate ([-20,0,-offset*2])  cylinder (r=10, h=88);
		translate ([0,0,-117]) cube (200, center=true);
		barrelSpace ();

	}

module tb1(offt) {
	difference () {
		scale ([.55,.55,1]) translate ([-10,20,-100]) cube (200, center=true);
		translate ([-64,80,-50]) cylinder (r=60, h=60);
		scale ([1,1,1]) turbine(offt);
	}
}

module pegs() {
	cylinder (r=holeSize*1.1, h=45, $fa=60);
}

module turb() {
color ([.5,.5,1]) tb1(22);
color ("salmon") translate ([-130,0,0]) mirror() tb1(22);
 difference() {
	color ([.6,1,.6]) translate ([0,0,-10]) scale ([.95,.95,.93]) guts();
	 translate ([0,0,-10]) cylinder (r=holeSize*1.2, h=70, $fa=60);
	}
}

module cir1() {
	circle(10);
}

module cir2() {
	translate ([0,10,0]) sphere(r, $fa=1);
	intersection () {
		union () {
			translate ([0,10,0])  cylinder (r=r, h=10);
			rotate ([0,0,60]) translate ([0,10,0])  cylinder (r=r, h=20);
			}
		cylinder (r=2*r, h=20);
		}
	}

module axelh1(l,w) {
	rotate ([0,180,0]) translate ([0,0,1]) cylinder (r1=.1, r2=w/1.15, h=15, $fa=1);
	rotate ([0,180,0]) translate ([0,0,16]) cylinder (r=w/1.15,  h=15);
	rotate ([0,180,0]) translate ([0,0,31]) scale ([1,1,-1]) cylinder (r1=w, r2=.1, h=l, $fa=60);
	rotate ([0,180,0]) translate ([0,0,31]) cylinder (r=w,  h=l, $fa=60);
}

module axelWhole(l,w) {
// union {
	axelh1(l,w);
	translate ([0,0,-(2*l+45)]) scale ([1,1,-1]) axelh1(l,w);
//	}
}

l=sin(60)*20;
r=l/2;

module braces1() {
	difference() {
		union() {
			translate([-20,0,-50]) scale([.5,2,12]) cube(10, center=true);
			translate([0,0,20]) scale([4.5,4.5,3]) cube(10, center=true);
			translate([0,0,-115]) scale([4.5,4.5,3]) cube(10, center=true);
		}
	circsDual();
	translate ([0,0,-116]) cylinder (r=8, h=136);
	}
}

module circs() {
	intersection () {
		union() {
			cir2();
			rotate ([0,0,120]) cir2();
			rotate ([0,0,240]) cir2();
		}
		translate ([0,0,-13]) cylinder (r1=4*r, r2=.1, h=40);
	}
}

module circsDual() {
	circs();
	translate ([0,0,-(2*l+60)]) scale ([1,1,-1]) circs();
}

module makeEm() {
	color ("light blue") circsDual();
	color ("light green")  axelWhole(25,10);
		braces1();
}
```


[User]
Okay, I'm looking to create a customizable 3D-printable cube with a few specific features. I've tried doing some simple stuff on my own but I think I need some help getting it all into a single, easy-to-use parametric model.

Basically, I want a cube with adjustable dimensions (width, length, and height), and it needs to have a cylindrical hole going partway through it from the top. I'd like to be able to control the radius and depth of that hole.

Additionally, I'd like to add optional wheels on either side of the cube. These should be cylinders, and I need to control their thickness as well. I want the ability to turn the wheels on or off with a single parameter.

Could you generate an OpenSCAD file for me that allows me to adjust these parameters? I also want to use the `MCAD/BOSL2` library if that's possible. I've heard it helps with making parametric designs easier to maintain and understand. I would prefer if it was all in a single file, please.

Specifically, here are the parameters I want to control:

*   `cube_width`: The width of the cube.
*   `cube_length`: The length of the cube.
*   `cube_height`: The height of the cube.
*   `hole_radius`: The radius of the cylindrical hole.
*   `hole_depth`: The depth of the cylindrical hole.
*   `wheel_thickness`: The thickness of the wheels (if they're enabled).
*   `show_wheels`: A boolean (or similar) parameter to turn the wheels on or off. I would like to be able to use "yes" and "no" to control it.

[Assistant]
20mm_cube.scad:
```
cube_size_width = 20; // [10:50]
cube_size_length = 20; // [10:50]
cube_size_height = 10; // [10:50]

// ignore this variable!
// foo=1;

// don't turn functions into params!
function BEZ03(u) = pow((1-u), 3);

difference() {
  union() {
    translate([0, 0, cube_size/2]) cube([cube_size_width,cube_size_length,cube_size_height], center=true);
    if (show_wheels == "yes") {
      translate([0, 0, cube_size/2]) rotate([0, 90, 0]) {
        cylinder(r=cube_size/2, h=cube_size+(wheel_thickness*2), center=true);
      }
    }
  }
  translate([0, 0, cube_size-hole_depth]) cylinder(r=hole_radius, h=hole_depth);
}

```


[User]
Okay, I'd like a parametric OpenSCAD design for a stacking container, similar to a pill box, but with some key customizations. I want to be able to define the overall dimensions and the locking mechanism parameters.

Here's what I'm thinking:

**General Container Parameters:**

*   **`insideDiameter`**:  The minimum interior diameter of the container. I want to be able to set this in millimeters.
*   **`interiorHeight`**: The height of the interior space of each container segment, in millimeters. I need each segment to be individually configurable for height.
*   **`rounding`**: The radius of the rounding on the edges of the container.
*   **`overhangAngle`**: The angle of the overhang of the container walls.  This will affect whether support material is needed for printing.
*   **`minimumWallThickness`**:  The minimum thickness of the container walls.
*   **`bottomThickness`**: The thickness of the bottom of each container segment.
*   **`lipHeight`**: The height of the lip that provides the connection between segments.
*   **`bayonetDepth`**: The depth that the bayonet locking mechanism protrudes.
*   **`partGap`**: The gap between the interlocking parts to adjust how tightly they fit.
* **`numberOfSides`**: The number of sides for the container. This should allow for not only cylindrical but also triangular/hexagonal/etc containers.

**Locking Mechanism Parameters:**

*   The locking mechanism should be a twist-lock bayonet type.
*   **`twistAngle`**: The amount of rotation needed to lock/unlock the pieces.
*   **`bayonetAngle`**: The angular size of each bayonet locking tab.
* I need the locking mechanism to work such that you can remove the bottom segment and attach it to the top to add additional segments.
* The user should be able to configure both how far the bayonets stick out and how wide they are.
*The user should be able to configure the shape of the containers as well as a basic cylinder.

**Label Parameters:**

*   **`labelText`**:  A string for the text to be rendered on each side of each segment. I want to be able to specify a different text string for each segment.
*   **`labelFont`**: The font used to render the text labels. I'd like to be able to choose a font from a library, like those included in the 'write/Write.scad' library.
*   **`labelHeight`**:  The height of the text label.
*   **`labelDepth`**: The depth of the text label.  Positive values should extrude the text, negative should emboss it.
*   **`labelRotation`**: The rotation angle of the text label.

**Stacking Functionality:**

*   The container should be made of multiple stackable segments.
*   Each segment should be able to be a different height.
*   The bottom segment should be able to be attached to the top so that segments can be moved from bottom to top of the stack as needed.

**Output:**

*   The final output should be a single OpenSCAD file.
*   I will need to use libraries from `utils/build_plate.scad` and `write/Write.scad`. I should not be required to paste in the contents of the libraries as a part of my prompt, and those files should not be part of the response.

Can you provide the OpenSCAD code that implements these features?

[Assistant]
pill_box_v1-0.scad:
```
use <utils/build_plate.scad>
use <write/Write.scad>

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

// minimum interior diameter of container
_insideDiameter = 18;

// height of the container's interior space
_interiorHeight = 12;

// radius of rounding of edges
_rounding = 8;

// overhang angle for the container (too horizontal of an angle - close to 0 - will require support)
_overhangAngle = 45;

// the thinnest walls of the container will use this value
_minimumWallThickness = 1.0;

// horizontal thickness used for the bottom layer
_bottomThickness = 0.8;

// height of the lip between the parts
_lipHeight = 2.4;

// how far the locking bayonets protrude
_bayonetDepth = 0.6;

// gap between moving parts to adjust how tightly the pieces fit together
_partGap = 0.12;

// text rendered on each side
_labelText = "";

// font used to render the label
_labelFont = "write/orbitron.dxf"; // ["write/orbitron.dxf":Orbitron, "write/letters.dxf":Basic, "write/knewave.dxf":KneWave, "write/BlackRose.dxf":BlackRose, "write/braille.dxf":Braille]

// height of the label in mm
_labelHeight = 8;

// depth of the label (negative values to emboss, positive values to extrude)
_labelDepth = -0.3;

// rotation of the text label
_labelRotation = 0;

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

build_plate(0);
make();

module make($fn=90) {
	twistAngle = 60; // amount of twist to close the lid
	bayonetAngle = 30; // angular size of the bayonets
	numberOfSides  = 3; // text is hard coded to work with 3 sides

	// override these to specify exterior dimensions instead of interior dimensions
	outsideDiameter = _insideDiameter + 2*(_minimumWallThickness*2 + _partGap + _bayonetDepth);
	separatorHeight = _interiorHeight + _bottomThickness;

	makePart(outsideDiameter, separatorHeight, numberOfSides, _rounding, _overhangAngle,
						_minimumWallThickness, _bottomThickness,
						_lipHeight, _bayonetDepth, bayonetAngle, _partGap,
						twistAngle,
						_labelText, _labelFont, _labelHeight, _labelDepth, _labelRotation);
}

module makePart(diameter, height, sides, rounding, overhang, wall, base, lipHeight, bayonetDepth, bayonetAngle, partGap, twistAngle, label, lfont, lheight, ldepth, lrotation) {
	height = max(height, base+lipHeight);
	radius = diameter/2;
	innerRadius = radius - wall*2 - bayonetDepth - partGap;
	middleRadius = radius - wall - bayonetDepth;
	wallThickness = radius - innerRadius;
	fullHeight = height + lipHeight;
	topBayonetAngle = bayonetAngle+3;
	chamfer = bayonetDepth;
	bayonetHeight = (lipHeight-chamfer)/2;
	angledCutDistance = (innerRadius+wall)*1.5;
	angledCutHeight = angledCutDistance * tan(overhang);
	eps = 0.1;

	difference() {
		union() {
			difference() {
				union() {
					// lip
					cylinder(r=innerRadius+wall, h=fullHeight);

					// body
					translate([0,0,lipHeight]) {
						polyCylinder(sides, radius, height + angledCutHeight, rounding);
					}
				}
				// overhang cut
				rotate_extrude(convexity = 4) {
					polygon(points = [ [innerRadius+wall, lipHeight],
											 [2*angledCutDistance, lipHeight-eps],
											 [2*angledCutDistance,  lipHeight + angledCutHeight] ],
											 paths = [[0,1,2]], convexity = 2);
				}
			}

			// bayonet
			rotate([0,0,-45]) {
				thread(innerRadius+wall-eps, innerRadius+wall+bayonetDepth,
						bayonetAngle, bayonetHeight, bayonetHeight/2, 0,
						chamfer, innerRadius, innerRadius+wall);
			}

			// extrude label
			if (ldepth > 0) {
				label(label, lfont, lheight, ldepth, -diameter/2, lipHeight + height/2 + (wall + bayonetDepth)*tan(overhang), lrotation);
			}
		}

		// embossed label
		if (ldepth < 0) {
			label(label, lfont, lheight, ldepth, -diameter/2, lipHeight + height/2 + (wall + bayonetDepth)*tan(overhang), lrotation);
		}

		// inner cutout
		translate([0,0,base]) {
			cylinder(r=innerRadius, h=fullHeight + angledCutHeight);
		}
		hull() {
			translate([0,0,lipHeight+max(wall,base)]) {
				cylinder(r=innerRadius, h=fullHeight + angledCutHeight);
			}
			translate([0,0,height]) {
				cylinder(r=middleRadius, h=fullHeight + angledCutHeight);
			}
		}

		// thread cutout
		translate([0,0,fullHeight-lipHeight-partGap]) {
			cylinder(r=middleRadius, h=lipHeight+partGap+eps);
		}

		// top thread
		rotate([0,0,45]) {
			thread(middleRadius-eps, middleRadius+bayonetDepth,
					topBayonetAngle, lipHeight*2, fullHeight, twistAngle + topBayonetAngle);

			thread(middleRadius-eps, middleRadius+bayonetDepth,
					topBayonetAngle+twistAngle, bayonetHeight + eps,
					fullHeight - lipHeight + bayonetHeight/2 + eps/2,
					twistAngle + topBayonetAngle,
					chamfer, middleRadius-eps, middleRadius);
		}

		// angled cut
		rotate_extrude(convexity = 4) {
			polygon(points = [ [innerRadius+wall, fullHeight],
								 [innerRadius+wall, fullHeight + angledCutHeight + eps],
								 [2*angledCutDistance, fullHeight + angledCutHeight] ],
							 	paths = [[0,1,2]], convexity = 2);
		}
	}
}

module label(text, font, height, depth, y, z, rotate) {
	eps = 0.1;
	if (text != "") {
		for (r = [0:120:360]) {
			rotate([0,0,r])
			translate([0,depth > 0 ? y - depth/2 + eps/2: y - depth/2 - eps/2,z])
			rotate([90,rotate,0])
			write(str(text), t=abs(depth)+eps, h=height, font=font, space=1.1, center=true);
		}
	}
}

module thread(r1, r2, angle, height, yoffset, rotation, chamfer=0, r3=0, r4=0) {
	for(a=[0,120,240])
	rotate([0,0,a + rotation])
	translate([0,0,yoffset]) {
		hull() {
			smallArc(r1, r2, angle, height);
			if (chamfer != 0) {
				translate([0,0,chamfer]) {
					smallArc(r3, r4, angle, height);
				}
			}
		}
	}
}

////////////// Utility Functions ///////////////////

// only works from [0 to 180] degrees, runs clockwise from 12 o'clock
module smallArc(radius0, radius1, angle, depth) {
	thickness = radius1 - radius0;
	eps = 0.01;

	union() {
		difference() {
			// full arc
			cylinder(r=radius1, h=depth, center=true);
			cylinder(r=radius0, h=depth+2*eps, center=true);

			for(z=[0, 180 - angle]) {
				rotate([0,0,z])
				translate([-radius1,0,0])
				cube(size = [radius1*2, radius1*2, depth+eps], center=true);
			}
		}
	}
}

module polyCylinder(sides, radius, height, rounding) {
	angle = 360/sides;
	hull() {
		for (a=[0:angle:360])
		rotate([0,0,a])
		translate([0,(radius - rounding)/cos(angle/2),0]) {
			cylinder(r=rounding, h=height);
		}
	}
}

```


[User]
Okay, so I need a mount for my Garmin Montana GPS that I can attach to my bike handlebars. I've seen some designs online, and I have a pretty good idea of what I'm after, but I need an OpenSCAD design that I can tweak to fit different bikes and GPS units in the future.

Essentially, the mount needs two main parts: a handlebar clamp and a GPS cradle with arms.

**Handlebar Clamp:**

*   This part will consist of two halves that bolt together around the handlebar.
*   It needs to fit handlebars of different diameters, so that should be a parameter. I'd like to set the default diameter to 23.2mm, which is the size of my Rockrider 500, but I want to easily adjust that to fit 15mm up to maybe 32mm.
*   The clamp halves should have a circular inner profile to grip the handlebar and should have integrated hex nut pockets for M3 bolts. I don't think we need to make the bolt hole diameters a parameter, they can just be standard size.
*   I would like the clamp to be at least 4mm thick after the hex nut pockets, so that should be a parameter, as well. I'm thinking 5mm, though for the hex nut thickness.

**GPS Cradle:**

*   This part will have two "arms" that hold the sides of the GPS unit.
*   The arms should extend from a back plate that connects to the handlebar clamp using M3 screws.
*   The arms need to have hooks at the end that grip the Montana unit, specifically. I can provide specific dimensions for these hooks, but let's make those parameters, as well. I'm thinking hook location should be (19mm, 19-0.8mm, 34 + 1.2mm), and the size of the hooks are (8mm, 2.8mm, 3mm), x, y, z, in that order.
*   The main body of the cradle should be made from the same thickness as the nut part so that it looks cohesive.
*   The GPS cradle also needs to have a sort of back plate that will bolt to the handle bar clamps. I can imagine this sort of looks like a cylinder extruded along the Z-axis and should be the same width as the clamping portion and be of the same thickness.

**General Requirements:**

*   The entire design should be fully parametric. I'd like to be able to change things like the handlebar diameter, thickness of the clamp, and GPS hook dimensions.
*   I need a parameter to switch between printing both the clamp and the cradle, just the clamp, or just the cradle.
*   I would like an option to lay the model down for printing.
*   I would like the design to be fairly robust, so that I don't have to worry about the mount breaking.
*   I don't think I'm going to need any libraries for this, so we can probably keep it simple.

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

[Assistant]
montana_tube_mount.scad:
```
// Set to "no" for printing:
print_it=0; // [1:yes,0:no]

// Print one "nut" and two "arm"s:
what="both"; // [both,nut,arm]

// Handlebar diameter:
handlebar_d=23.2;

//
// Handlebar support for Garmin Montana GPS - Rev 1.01
//
// CC-BY-NC 2013 by Jeremie.Francois@gmail.com / MoonCactus on thingiverse
// http://betterprinter.blogspot.com
//
// It slices neatly on an ultimaker with the following parameters
//
// 0.2 mm layers
// 1.8 mm walls (loops->infill->perimeters)
// 1.2mm bottom/top
// 30% fill
//

// handlebar_d: [15:32]

// decathlon rockrider 500 = 23.2

tol=0+0.1;

// Main thickness
th= 0+4;
hnut_th= 0+5;

hook_x=0+19; // from center
hook_y=0+19-0.8; // 19mm from screen towards the back
hook_z=0+34 + 1.2; // from center// V1 was "1"

hook_szx= 0+8;
hook_szy= 0+2.8; // v1 was 2
hook_szz= 0+3;

arm_th= 0+6;

gps_szx= 0+145;
gps_szy= 0+37;
gps_szz= 0+75;

// How far is the handlebar (display only)
handle_y= 19+th + handlebar_d/2;

module body(w,h, margin)
{
	color([1,1,0])
	{
		scale([1,1.02,1])
		translate([-2,-2.1-0.6,-w/2]) linear_extrude(height=w) scale(0.192) import(file = "montana_large.dxf");

		rotate([0,90,0])
		translate([0.32,-0.45,-h/2])
		rotate([0,0,0.7]) linear_extrude(height=h) scale([0.08,0.082,0.08]) import(file = "montana_short.dxf");
	}
}

module ccyl(r,h, rot=[0,0,0])
{
	rotate(rot) translate([0,0,-h/2]) cylinder(r=r,h=h, $fs=0.5);
}

// hook
module hook()
{
	color([1,0.5,0.5])
		translate([0,-gps_szy/2, 0])
		{
			translate([hook_x,hook_y,hook_z])
			{
				hull()
				{
					ccyl(r=hook_szy/2, h=hook_szx, rot=[0,90,0]);
					translate([0,0,hook_szz]) ccyl(r=hook_szy/2, h=hook_szx, rot=[0,90,0]);
				}
			}
		}
}

module back_plate()
{
	hull()
	{
		translate([0,20,20]) rotate([0,90,0]) ccyl(r=2.4,h=arm_totszx,$fs=1);
		translate([0,20,0]) rotate([0,90,0]) ccyl(r=2.4,h=arm_totszx,$fs=1);
	}
}

arm_totszx= hook_x*2 + hook_szx;
module roundedarmtop()
{
	difference()
	{
		intersection()
		{
			union()
			{
				hull()
				{
//					translate([2,1,gps_szy- gps_szy/2-0.5]) rotate([0,90,0]) ccyl(r=gps_szy/2+th, h=arm_totszx);
				scale([1,1.2,1])
					translate([0,-2.5,gps_szy- gps_szy/2-0.5])
						rotate([0,90,0]) ccyl(r=gps_szy/2+th, h=arm_totszx);
					translate([0,-8,34- 15/2])
						rotate([0,90,0]) ccyl(r=15, h=arm_totszx);
				}
				back_plate();

				// protruding bit to open the arms
				hull()
				{
					translate([0,-13.5+2,gps_szz-37+8])
						rotate([0,90,0]) ccyl(r=2.4,h=arm_totszx,$fs=1);
					translate([0,-13.5+5,gps_szz-37+2])
						rotate([0,90,0]) ccyl(r=2.4,h=arm_totszx,$fs=1);
				}

			}
			union()
			{
				translate([0,-13.5,gps_szz-37]) rotate([0,90,0]) ccyl(r=2.4,h=100,$fs=1);
				translate([-50,-14,-tol]) cube([100,50,100]);
			}
		}
		body(1,gps_szx-80, 3); // remove on X axis
	}
}

// viewed from the back
module arm_half()
{
	difference()
	{
		roundedarmtop();
		// cut them in half
		cube([hook_x*2 - arm_th*2,gps_szy+th*4+tol,gps_szz+th*2+tol+20],center=true);
	}
}

module arms()
{
	for(mz=[-1:+1])
	{
		scale([1,1,mz])
		{
			arm_half();
			hook(); scale([-1,1,1]) hook();
		}
	}
}

module handlebar()
{
	translate([0,handle_y,0])
		rotate([0,90,0])
			ccyl(r=handlebar_d/2,h=100);
}

module back()
{
	// Back plate
	difference()
	{
		hull()
		{
			intersection()
			{
				union() { back_plate(); scale([1,1,-1]) back_plate(); }
				body(1,gps_szx-80, 3); // remove on X axis
			}
			translate([0,20+th,0]) cube([arm_totszx,th,41],center=true);
		}
	}
}

module fullgrip()
{
	difference()
	{
		union()
		{
			arms();
			back();
		}

		// screw holes
		screwset("onlyscrews");
		handlebar();
	}
}

module screw()
{
	cylinder(r=6/2+0.5, h=3, $fs=1); // screw head
	cylinder(r=3/2+0.2, h=30, $fs=1); // screw head
}

module screwset(what="onlyscrews")
{
	for(sz=[-1:2:1])
		for(sx=[-1:2:1])
			translate([11*sx,17,(handlebar_d/2+hnut_th/2)*sz])
				for(mz=[-1:1])
					scale([1,1,mz])
						rotate([-90,0,0])
		{
			screw();
			if(what!="onlyscrews")
				translate([0,0,handle_y-handlebar_d/2-10 + handlebar_d*0.4])
					cylinder(r1=6.01/2,r2=6.01/2+5,h=40,$fn=6);
		}
}

module handle_nut()
{
	difference()
	{
		hull()
		{
			translate([0,handle_y,0])
			{
				rotate([0,90,0])
					ccyl(r=handlebar_d/2+hnut_th, h=arm_totszx);

				translate([0,-handlebar_d/2,0])
					cube([arm_totszx,tol,handlebar_d+hnut_th*2],center=true);
			}
		}
		screwset("nuts");
		hull()
		{
			handlebar();
			translate([0,-20,0]) handlebar();
		}
		translate([0,handle_y-handlebar_d/2-10,0])
			cube([arm_totszx+tol,34,gps_szz],center=true);
		translate([0,handle_y+handlebar_d-hnut_th,0])
			sphere(r=handlebar_d/2);
	}
}

if(what=="nut" || what=="both")
{
	rotate([0,print_it?90:0,0]) // uncomment this to lay it flat for printing
		handle_nut();
}

if(what=="arm" || what=="both")
{
	rotate([0,print_it?90:0,0])
	intersection()
	{
		fullgrip();
		if(print_it)
			translate([0,-50,-50]) cube([100,100,100]); // only half of the stuff
	}
}
// %cube([gps_szx,gps_szy,gps_szz],center=true); // ghost of the device

```


[User]
Okay, I need a marker holder designed for whiteboards, and I want it to be easily customizable.

Here’s the idea: I’d like a tray that sits on the top edge of a whiteboard, with a lip on the back that hooks over the top. I need to be able to adjust the dimensions of the tray, the height of the lip, and the thickness of the material, basically everything.

Here’s a more detailed breakdown of what I need:

**Basic Structure:**

*   The main body should be a rectangular tray shape, created by subtracting a smaller rectangular solid from a larger one, leaving a hollow tray with walls.
*   The back of the tray should have a clip that also hooks over the whiteboard, so it's secure and won’t fall off. This clip should also be created by a difference between two rectangular solids.

**Parameters (that should be customizable):**

*   **`wall_thickness`**: Thickness of the tray walls and the clip. This is the thickness of the plastic itself.
*   **`tray_height`**: The height of the tray's main body, including the base.
*   **`tray_width`**: The width of the inside of the tray, where the markers sit.
*   **`clip_height`**: The overall height of the back clip.
*    **`clip_depth`**: The distance that the back lip projects out from the back of the tray.
*   **`clip_width`**: The width of the clip. This determines how far across the board's edge the lip should project.
*   **`holder_length`**: The overall length of the tray.

**Key Customizations:**

*   I need all dimensions above to be easily adjusted using variables within the SCAD file. This is important as different whiteboards will have different thicknesses and heights on their top edges. I need to change the overall length, width and depth of the tray, as well as how deep the clip goes over the board.
* The clip should be able to be a different height and depth from the tray.
* It should use standard OpenSCAD functions (cube, translate, difference, union).

Could you please generate an OpenSCAD file with these features? I would like it to be as easy to modify as possible for different sizes of whiteboards, so the more variables the better.

[Assistant]
marker_holder.scad:
```
wall_thickness = 2;
tray_height = 7;
tray_width = 15;
clip_height = 11;
clip_width = 7;
holder_length = 100;

module marker_holder() {
  union() {
    difference() {
      cube([tray_width + 2 * wall_thickness, tray_height, holder_length]);
      translate([wall_thickness, -wall_thickness, -wall_thickness / 2]) {
        cube([tray_width, tray_height, holder_length + wall_thickness]);
      }
    }
    translate([0, 5, 0]) {
      difference() {
        cube([clip_width + 2 * wall_thickness, clip_height, holder_length]);
        translate([wall_thickness, wall_thickness, -wall_thickness / 2]) {
          cube([clip_width, clip_height, holder_length + wall_thickness]);
        }
      }
    }
  }
}

marker_holder();

```