[User]
Hi, I'd like to design a customizable bottle brush using OpenSCAD. I've got some ideas about how I want it to work, and I'd like to be able to control a lot of parameters. I'll need to be able to print the bristles in layers and the center post separately, for assembly after printing.

Here's what I'm envisioning:

**Brush Layers:**

*   **Bristle Count:** I need to specify how many bristles are on each layer, like 40 or so.
*   **Brush Outer Diameter:** This should control the radius of the brush bristles.
*   **Center Support:** There should be a cylindrical central support for the bristles, with both an outer radius and an inner hole radius to accommodate a central post.
*   **Bristle Width:** I want to control how wide or flat each bristle is.
*   **Bristle Height:** I want to specify the thickness of each bristle.
*   **Layer Spacing:** The vertical distance between the bristle layers needs to be adjustable.
*   **Bristle Rise:** I'd like an option to have bristles rise up off the print bed to give a droop effect, if I want.

**Central Post:**

*   **Keyed Center:** The post should have the option to be keyed (a D-shaped hole) to allow for staggered alignment of bristle layers.
*   **Key Depth:** I need to control how deep the key is, as a fraction of the radius, to make the D hole.
*   **Post Length:** I need to set the total length of the central post.
*   **Mounting Hole:** I'd like to optionally have a hole through the post for mounting it.
*   **Tip Transition:** I would like a tapered or shrunk tip on the post for easier assembly.

**General Settings:**

*   **Tolerances:** There should be a tolerance setting to adjust fit for 3d printer inaccuracies.
*   **Handle Options:** I need to have the option for either a handle on the post or a mounting hole, but only one.

I'd like to have the ability to print each of the following separately:
1. One or more bristle layers (one at a time). There should be an option for a key notch to indicate the layer number.
2. The central post, with optional handle or mounting hole.

It would be great if the SCAD files used modules to keep everything organized and easy to tweak. Can you help me out with this design? I don't need any libraries.

[Assistant]
Mark_brush_2.7.4_web2.scad:
```
//bottle brush creator - v2.7.4
//Mark G. Peeters August 16, 2015 CC BY-SA
//inspired by drooloops flowers
//more details are posted here:
//https://www.youmagine.com/designs/bottle-brush-customizable/
//http://www.thingiverse.com/thing:980106
// preview[view:west, tilt:top diagonal]

/* [choose parts to print] */
//print what?
print=0;//[0:bristles_layer,1:centerpost]
//for keyed center only (see post settings tab) - number stagger layers used
staggers=2;//[2:two stagger parts,3:three stagger parts]
//which stagger to print, generate one at a time, NOTE!- there will be a notch made in the center support corresponding the the part number. So 1st part has one notch, 2nd part has 2 notches, etc
stag_num=1;//[1:1st stagger part,2:2nd stagger part,3:3rd stagger part]

/* [brush settings] */
//number of bristle per layer
b_number=40; //[1:50]
//outer radius of brush bristle
brush_od=25;//25
//center support radius outer OD
center_support=5.6;//5.6
//center support radius of hole ID
center_hole=4;//4

/* [central post settings] */
//center keyed? this make center a D hole
center_key=0;//[0:no,1:yes]
//decimal percent key depth from center zero to one
center_key_depth=0.6;//0.6
//length of central post
post_z=16;//16
//mount hole radius
post_mount_hole=2.2;//2.2
//fit tolerance, radius value
tol=0.2;//0.2

/* [advanced settings] */
//bristle width - flatness
b_width=0.8;//0.8
//bristle height - thickness
b_height=0.3;//0.3
//bristle layer spacing on shaft - how far in between bristles (NOTE: minimum setting is equal to bristle height
b_space_z=2;//2
//bristle rise above print bed, zero for flat, 0.3 or more for drooloop
b_rize=0.0;//0.0
//central post transition at tip
post_tip_z=0.7;//0.7
//central post mm to shrink at tip
post_tip_shrink=0.7;//0.7

/* [Hidden] */

//key rotation
key_rot=(360/b_number)/staggers;
//key_rot=40;

//handle parameters
//brush handle or mount hole (not used in 2.7)
handle=0;//[0:handle,1:mount hole]
handle_length=50;//length of handle if used
handle_radius=5;//radius for handle if used make smaller that hole
$fn=100;

if (print==0){//print bristle layer

    if (center_key==1){
   difference(){//put layer indicator on bristle
       union(){
  layer(b_number,b_width,brush_od,b_height,center_hole,center_support,b_space_z,b_rize);
    holekey(center_hole,key_rot*stag_num,b_space_z,center_support,center_key_depth);
       }//end union
    translate([0,0,b_space_z-0.2])bristles_ind(stag_num,b_width,brush_od,b_height);
   }//end diff bristle indicator
  }

  if (center_key==0){
  layer(b_number,b_width,brush_od,b_height,center_hole,center_support,b_space_z,b_rize);
  }
}
//end print choices

if (print==1){//print center post

if (handle==1){//add handle
post(center_hole,post_z,center_key_depth,tol,post_tip_z,post_tip_shrink);
    translate([0,0,post_z])cylinder(r=handle_radius,h=handle_length);
}//end add handle

   if (handle==0){//make hole
   rotate([180,0,0])difference(){
post(center_hole,post_z,center_key_depth,tol,post_tip_z,post_tip_shrink);
    translate([0,0,-(post_tip_z+1)])cylinder(r=post_mount_hole,h=post_z+post_tip_z+5,$fn=100);
   }//end diff
}//end add hole

//add cap
rotate([180,0,0])difference(){
translate([center_hole*3,0,post_z])cylinder(r=center_hole+1,h=1);
translate([center_hole*3,0,-(post_tip_z+1)])cylinder(r=post_mount_hole,h=post_z+post_tip_z+5,$fn=100);
   }//end diff

}
//end print choices

//make a layer-------------------------------------------
module layer(b_number,b_width,brush_od,b_height,center_hole,center_support,b_space_z,b_rize){
difference(){
// make the too long bristle shape
difference(){
    union(){
        translate([0,0,b_rize])bristles(b_number,b_width,brush_od+2,b_height);
        ring(center_hole,center_support,b_space_z);
    }//end union
    translate([0,0,-1])cylinder(r=center_hole,h=b_space_z+2);
  };//end diff
//trimm the bristles
  translate([0,0,-1])ring(brush_od,sqrt(brush_od*brush_od+(b_width*b_width)/4)+4,b_space_z+2);
  }//end layer diff

  }
  //end mod layer

//add key?-------------------
  module holekey(center_hole,key_rot,b_space_z,center_support,center_key_depth){
if (center_key==1){
difference(){
    translate((center_hole*(0.5+center_key_depth))*[sin(key_rot), -cos(key_rot),0])
    translate([0,0,b_space_z/2])
    rotate([0,0,key_rot])
    cube([center_support*2,center_hole,b_space_z],center=true);

    translate([0,0,-1])ring(center_support,center_support*2,b_space_z+2);
            }//end diff
            }//-----end add key------------------
        }
//end mod holekey---------------------------

//!bristles(b_number,b_width,brush_od,b_height);
module bristles(b_number,b_width,brush_od,b_height){
    for (i=[1:b_number]) {//single petal layer
			rotate ([0,0,i*360/b_number])
			color ("blue")
    translate([-b_width/2,0,0])cube([b_width,brush_od,b_height]);
		}//end i single petal layer
    };//end modle bristles
module ring(ring_inside,ring_outside,ring_height){
   difference(){
        cylinder(r=ring_outside,h=ring_height);
    translate([0,0,-1])cylinder(r=ring_inside,h=ring_height+2);
   }//end diff
}//end mod ring

module bristles_ind(b_number,b_width,brush_od,b_height){
    for (i=[1:b_number]) {//single petal layer
			rotate ([0,0,i*30])
			color ("blue")
    translate([-b_width/2,0,0])cube([b_width,brush_od+2,b_height]);
		}//end i single petal layer
    };//end modle bristles

//!post(center_hole,tol);
module post(center_hole,post_z,center_key_depth,tol,post_tip_z,post_tip_shrink){
//main
    keyed_cylinder(center_hole,post_z,center_key,center_key_depth,tol);
//tip for easy assembly
    hull(){
    keyed_cylinder(center_hole,0.01,center_key,center_key_depth,tol);
    translate([0,0,-post_tip_z])
    //scale([.9,.9,1])
    keyed_cylinder(center_hole-post_tip_shrink,0.01,center_key,center_key_depth,tol);
    }//end hull
//collar
    translate([0,0,post_z])cylinder(r=center_hole+1,h=1);
};//end mod post

//!keyed_cylinder(center_hole,post_z,center_key,center_key_depth,tol);
module keyed_cylinder(od,tall,center_key,center_key_depth,tol){
    if (center_key==1){
difference(){
    cylinder(r=od-tol,h=tall);
    translate([0,((od*(0.5+center_key_depth))-tol),0])
    translate([0,0,tall/2])
    cube([od*2,od,tall+2],center=true);
    }//end diff
}//end if keyed
if (center_key==0){
cylinder(r=od-tol,h=tall);
}//end if not keyed
}
//end module keyed_cylinder

```


[User]
I'd like to design a spring, but I don't want a coil spring; I'm looking for an accordion or zig-zag style spring. I need it to be parametric so I can easily adjust its dimensions. Specifically, I'd like to control the overall length, the number of folds, the width and height of each fold, and the thickness of the material.

Additionally, I need to be able to control how the ends of the spring are handled. I'd like an option to have them be just the end of the zig-zag, but also options to add right-angle extensions either to just one side, or both sides. It'd be nice if I could add a cylindrical reinforcement on the ends as well, if right-angle extensions are used.

Finally, I'd like to be able to place up to five holes along the length of the spring, controlling their shape (triangle, square, hexagon, or circle), diameter, rotation, and position within the width and height of the spring. I also want two additional sets of holes: one set of holes only on the ends, and another set of holes that are placed on the folds themselves (not the ends), all with the same shape, diameter, rotation, and position options as the first five.

Could you generate the OpenSCAD code for this? I don't need any specific libraries, so just standard OpenSCAD primitives should be fine. I'm not looking for any special text features or anything complicated beyond what I've described.

[Assistant]
Accordion_Folded_Spring.scad:
```
/* [Accordion] */
accordion_length=100;//[5:300]
accordion_folds=13;//[1:150]
accordion_width=25;//[5:200]
accordion_height=25;//[1:0.1:200]
accordion_sheet_thickness=1;//[0.2:0.05:10]
accordion_right_angle_ends=0;//[0:None,1:To one side,2:To both sides]
reinforcement_for_ends="No";//[No,Yes]
/* [1. hole] */
hole_1=0;//[0:None,3:Triangle,4:Square,6:Hexagon,100:Circle]
hole_1_diameter=5;//[1:0.1:50]
hole_1_rotate=45;//[0:395]
hole_1_X_position=0;//[-100:0.1:100]
hole_1_Y_position=0;//[-100:0.1:100]
/* [2. hole] */
hole_2=0;//[0:None,3:Triangle,4:Square,6:Hexagon,100:Circle]
hole_2_diameter=5;//[1:0.1:50]
hole_2_rotate=45;//[0:395]
hole_2_X_position=0;//[-100:0.1:100]
hole_2_Y_position=0;//[-100:0.1:100]
/* [3. hole] */
hole_3=0;//[0:None,3:Triangle,4:Square,6:Hexagon,100:Circle]
hole_3_diameter=5;//[1:0.1:50]
hole_3_rotate=45;//[0:395]
hole_3_X_position=0;//[-100:0.1:100]
hole_3_Y_position=0;//[-100:0.1:100]
/* [4. hole] */
hole_4=0;//[0:None,3:Triangle,4:Square,6:Hexagon,100:Circle]
hole_4_diameter=5;//[1:0.1:50]
hole_4_rotate=45;//[0:395]
hole_4_X_position=0;//[-100:0.1:100]
hole_4_Y_position=0;//[-100:0.1:100]
/* [5. hole] */
hole_5=0;//[0:None,3:Triangle,4:Square,6:Hexagon,100:Circle]
hole_5_diameter=5;//[1:0.1:50]
hole_5_rotate=45;//[0:395]
hole_5_X_position=0;//[-100:0.1:100]
hole_5_Y_position=0;//[-100:0.1:100]
/* [Ends only hole] */
hole_6=0;//[0:None,3:Triangle,4:Square,6:Hexagon,100:Circle]
hole_6_diameter=5;//[1:0.1:50]
hole_6_rotate=45;//[0:395]
hole_6_X_position=0;//[-100:0.1:100]
hole_6_Y_position=0;//[-100:0.1:100]
/* [Folds only hole] */
hole_7=0;//[0:None,3:Triangle,4:Square,6:Hexagon,100:Circle]
hole_7_diameter=5;//[1:0.1:50]
hole_7_rotate=45;//[0:395]
hole_7_X_position=0;//[-100:0.1:100]
hole_7_Y_position=0;//[-100:0.1:100]
/* [Hidden] */
pikkus=accordion_length;
laius=accordion_width;
korgus=accordion_height;
paksus=accordion_sheet_thickness;
murdeid=accordion_folds;
samm=(pikkus-paksus)/murdeid;
kraadid=asin((samm)/(laius));
hole_1_X=abs(hole_1_X_position)>laius/2+hole_1_diameter/2?laius/2+hole_1_diameter/2-0.1:hole_1_X_position;
hole_1_Y=abs(hole_1_Y_position)>korgus/2+hole_1_diameter/2?korgus/2+hole_1_diameter/2-0.1:hole_1_Y_position;
hole_2_X=abs(hole_2_X_position)>laius/2+hole_2_diameter/2?laius/2+hole_2_diameter/2-0.1:hole_2_X_position;
hole_2_Y=abs(hole_2_Y_position)>korgus/2+hole_2_diameter/2?korgus/2+hole_2_diameter/2-0.1:hole_2_Y_position;
hole_3_X=abs(hole_3_X_position)>laius/2+hole_3_diameter/2?laius/2+hole_3_diameter/2-0.1:hole_3_X_position;
hole_3_Y=abs(hole_3_Y_position)>korgus/2+hole_3_diameter/2?korgus/2+hole_3_diameter/2-0.1:hole_3_Y_position;
hole_4_X=abs(hole_4_X_position)>laius/2+hole_4_diameter/2?laius/2+hole_4_diameter/2-0.1:hole_4_X_position;
hole_4_Y=abs(hole_4_Y_position)>korgus/2+hole_4_diameter/2?korgus/2+hole_4_diameter/2-0.1:hole_4_Y_position;
hole_5_X=abs(hole_5_X_position)>laius/2+hole_5_diameter/2?laius/2+hole_5_diameter/2-0.1:hole_5_X_position;
hole_5_Y=abs(hole_5_Y_position)>korgus/2+hole_5_diameter/2?korgus/2+hole_5_diameter/2-0.1:hole_5_Y_position;
hole_6_X=abs(hole_6_X_position)>laius/2+hole_6_diameter/2?laius/2+hole_6_diameter/2-0.1:hole_6_X_position;
hole_6_Y=abs(hole_6_Y_position)>korgus/2+hole_6_diameter/2?korgus/2+hole_6_diameter/2-0.1:hole_6_Y_position;
hole_7_X=abs(hole_7_X_position)>laius/2+hole_7_diameter/2?laius/2+hole_7_diameter/2-0.1:hole_7_X_position;
hole_7_Y=abs(hole_7_Y_position)>korgus/2+hole_7_diameter/2?korgus/2+hole_7_diameter/2-0.1:hole_7_Y_position;
difference(){
union(){
for(x=[0:2:murdeid-1]){vasakule(x);paremale(x);}
if(accordion_right_angle_ends>0){hull(){translate([paksus/2,laius/2-paksus/2,0])cylinder(d=paksus,h=korgus,center=true,$fn=100);translate([paksus/2,-laius/2+paksus/2,0])cylinder(d=paksus,h=korgus,center=true,$fn=100);}if(reinforcement_for_ends=="Yes"){hull(){translate([paksus/2,-laius/2+paksus/2,0])cylinder(d=paksus,h=korgus,center=true,$fn=100);translate([samm+paksus/2,-laius/2+paksus/2,0])cylinder(d=paksus,h=korgus,center=true,$fn=100);}}}
if(accordion_right_angle_ends>1){hull(){translate([pikkus-paksus/2,laius/2-paksus/2,0])cylinder(d=paksus,h=korgus,center=true,$fn=100);translate([pikkus-paksus/2,-laius/2+paksus/2,0])cylinder(d=paksus,h=korgus,center=true,$fn=100);}if(reinforcement_for_ends=="Yes"){pool=round(murdeid/2)*2==murdeid?-laius/2+paksus/2:laius/2-paksus/2;hull(){translate([pikkus-paksus/2,pool,0])cylinder(d=paksus,h=korgus,center=true,$fn=100);translate([pikkus-samm-paksus/2,pool,0])cylinder(d=paksus,h=korgus,center=true,$fn=100);}}}}
if(hole_1!=0){translate([0,hole_1_X,hole_1_Y])rotate([0,90,0])translate([0,0,pikkus/2])rotate([0,0,hole_1_rotate])cylinder(d=hole_1_diameter,h=pikkus,center=true,$fn=hole_1);}
if(hole_2!=0){translate([0,hole_2_X,hole_2_Y])rotate([0,90,0])translate([0,0,pikkus/2])rotate([0,0,hole_2_rotate])cylinder(d=hole_2_diameter,h=pikkus,center=true,$fn=hole_2);}
if(hole_3!=0){translate([0,hole_3_X,hole_3_Y])rotate([0,90,0])translate([0,0,pikkus/2])rotate([0,0,hole_3_rotate])cylinder(d=hole_3_diameter,h=pikkus,center=true,$fn=hole_3);}
if(hole_4!=0){translate([0,hole_4_X,hole_4_Y])rotate([0,90,0])translate([0,0,pikkus/2])rotate([0,0,hole_4_rotate])cylinder(d=hole_4_diameter,h=pikkus,center=true,$fn=hole_4);}
if(hole_5!=0){translate([0,hole_5_X,hole_5_Y])rotate([0,90,0])translate([0,0,pikkus/2])rotate([0,0,hole_5_rotate])cylinder(d=hole_5_diameter,h=pikkus,center=true,$fn=hole_5);}
if(hole_6!=0){translate([0,hole_6_X,hole_6_Y])rotate([0,90,0])translate([0,0,paksus/2+0.1])rotate([0,0,hole_6_rotate])cylinder(d=hole_6_diameter,h=paksus+0.2,center=true,$fn=hole_6);translate([0,hole_6_X,hole_6_Y])rotate([0,90,0])translate([0,0,pikkus-paksus/2-0.1])rotate([0,0,hole_6_rotate])cylinder(d=hole_6_diameter,h=paksus+0.2,center=true,$fn=hole_6);}
if(hole_7!=0){translate([0,hole_7_X,hole_7_Y])rotate([0,90,0])translate([0,0,pikkus/2])rotate([0,0,hole_7_rotate])cylinder(d=hole_7_diameter,h=pikkus-2*paksus-0.2,center=true,$fn=hole_7);}}
module vasakule(aste){
hull(){translate([aste*samm+paksus/2,laius/2-paksus/2,0])cylinder(d=paksus,h=korgus,center=true,$fn=100);translate([(aste+1)*samm+paksus/2,-laius/2+paksus/2,0])cylinder(d=paksus,h=korgus,center=true,$fn=100);}}
module paremale(aste){
if(aste<murdeid-1){hull(){translate([(aste+2)*samm+paksus/2,laius/2-paksus/2,0])cylinder(d=paksus,h=korgus,center=true,$fn=100);translate([(aste+1)*samm+paksus/2,-laius/2+paksus/2,0])cylinder(d=paksus,h=korgus,center=true,$fn=100);}}}
```


[User]
I'm looking to design a toy train engine that can run on standard wooden train tracks. I'd like it to be parametric so I can easily adjust the dimensions later if needed. I've already got some design ideas in mind.

Here's the basic functionality and a list of the parts I need:
*   The train should have a main body, wheels, and places for magnets to attach at the front and back, so it can connect to other cars.
*   The wheels should have a dual diameter; an outer diameter, and a smaller diameter that the wheel runs on.
*   The body should have a basic train shape with a flat base, a sloped top, and a rounded section at the front. There should be some detail on top that includes a cylindrical section with details and a bit of an overall 'chunky' look.
*   Axle holes should be sized for The Hillman Group 3832 1-1/4 In. Posts with Aluminum Screw (about 5.5mm diameter).
*   Magnet holders should be sized for 3mm thick magnets that are 13mm in diameter (cylinder is 14.8mm). The holders should be a cylinder with a smaller cylinder inside for the magnet and a spherical cap to contain them.
*   I'd like to easily adjust the overall length, width, and height of the main body as well as the wheel size, magnet size, and the axle diameter.

I'd like this designed as an OpenSCAD project, so please create all the necessary .scad files, and make sure to define all the key dimensions as parameters at the top of the main file so I can easily change them. I'd like to use some libraries that help me to create the magnet holders, specifically the `rail.scad` library.

[Assistant]
train_v2.scad:
```
use <rail.scad>;

$fn = 200;

wheel_diameter = 20;
wheel_diameter_inner = wheel_diameter - 6;

wheel_width = 5;
wheel_width_inner = wheel_width - 2.5;

length = 65;
width  = 20;
height = 15;

rod_diameter = 5;
hole_diameter = 5.5;

module wheel(cover = false) {

    difference() {
        union() {
//            translate([0,0,-1])
//            cylinder(h = 1, d = 6);
            cylinder(h = wheel_width_inner, d = wheel_diameter);
            cylinder(h = wheel_width      , d = wheel_diameter_inner);

            if(cover == true) {
            intersection() {
                translate([0,0,-wheel_diameter_inner+7])
                sphere(d =wheel_diameter_inner * 2);
                cylinder(h = wheel_width +2     , d = wheel_diameter_inner);

                }
            }
        }
        translate([0,0,-5])
        if(cover == true) {
            cylinder(d = hole_diameter, h = 10);
        }
        else {
            cylinder(d = hole_diameter, h = 11);
        }
    }
}

module body(center = true) {

    difference() {
    union() {
        translate([0,0,16])
        polyhedron(
            points = [
                [0,-4,0],
                [length-2, -4,0],
                [length-2, width+4, 0],
                [0, width+4, 0],

                [10,5,height],
                [length-10, 5,height],
                [length-10, width-5, height],
                [10, width-5, height]

            ],
            faces = [
                [0,1,3],
                [1,2,3],
                [0,3,4],
                [4,3,7],
                [1,0,5],
                [0,4,5],
                [2,1,5],
                [2,5,6],
                [3,2,7],
                [2,6,7],
                [5,4,6],
                [6,4,7]
            ]
        );

        cube([length, width, 16]);

        translate([0,-4,15])
        difference() {
            cube([width * 1.2, width *1.4, 24]);
            translate([-1,3,3])
            cube([width * 1.2+2, width *1.4-6, 24]);
        }

        translate([0,-4,15])
        cube([length, width *1.4, 1.5]);

        translate([width, width/2, 22])
        rotate([0,90,0])
        cylinder(d = width*1.2, h = length-3-width);

        translate([length - 15, width /2, 22])
        cylinder(d = 12, h = 20);

        translate([length - 30, width /2, 22])
        cylinder(d = 4, h = 15);

        translate([length - 15, width /2, 36])
        cylinder(d1 = 12, d2 = 16, h = 6);

        difference() {
            translate([0,width/2, 28])
            scale([1,1.4,1])
            rotate([90,0,90])
            cylinder(h =  width * 1.2, d = width * 1.5);

            translate([-1,-width,15])
            cube([width * 1.2+2, width *4, 22]);

        }
    }

    translate([10,-5,3.2])
    rotate([-90,0,0])
    {
        cylinder(h = width + 10, d = hole_diameter);
        translate([0,-1,0])
        cylinder(h = width + 10, d = hole_diameter);
        translate([-hole_diameter/2,-1,0])
        cube([hole_diameter, 1, width + 10]);
    }

    if(center) {
    translate([length/2,-5,3.2])
    rotate([-90,0,0])
    {
        cylinder(h = width + 10, d = hole_diameter);
        translate([0,-1,0])
        cylinder(h = width + 10, d = hole_diameter);
        translate([-hole_diameter/2,-1,0])
        cube([hole_diameter, 1, width + 10]);
    }
}

    translate([length-10,-5,3.2])
    rotate([-90,0,0])
    {
        cylinder(h = width + 10, d = hole_diameter);
        translate([0,-1,0])
        cylinder(h = width + 10, d = hole_diameter);
        translate([-hole_diameter/2,-1,0])
        cube([hole_diameter, 1, width + 10]);
    }

            translate([0,-1,18])
            cube([width * 1.2-3, width *1.4-6, 19]);

}
}

module wheels() {
    translate([10,-1,4])
    rotate([90,0,0])
    wheel();

    translate([length-10,-1,4])
    rotate([90,0,0])
    wheel();

    translate([length-10,width+1,4])
    rotate([-90,0,0])
    wheel();

    translate([10,width+1,4])
    rotate([-90,0,0])
    wheel();

    translate([length/2,width+1,4])
    rotate([-90,0,0])
    wheel();

    translate([length/2,-1,4])
    rotate([90,0,0])
    wheel();
}

module train() {

    color("brown")
    body();
    color("silver")
    wheels();

    color("silver")
    translate([1.5,10,7.5])
    rotate([0,-90,0])
    magnet_holder(true);

    color("silver")
    translate([length-1.5,10,7.5])
    rotate([0,90,0])
    magnet_holder(true);
}

// translate([-length/2, - width /2 , 8])
// train();

// rail(120);

module assembled_wheel() {
    color("silver")
    {
        rotate([180,0,0])
        wheel();

        cylinder(h = width, d = 4);

        translate([0,0,width])
        wheel();
    }
}

module rod() {

    cylinder(d = rod_diameter, h = 24);

}

// assembled_wheel();
// wheel();

// body();
// rod();

module magnet_holder(display = false) {

    difference() {
        cylinder(d = 14.8, h = 3.8);
        translate([0,0,.8])
        cylinder(d = 13, h = 7);
    }

    tran = display ? [0,0,6]: [16,0,0];
    translate(tran)
    intersection() {
        translate([0,0,-12.5])
    sphere(d = 14.8 * 2);
    cylinder(d = 14.8, h = 9);
    }

}

module print() {

    if(false)
    {
    difference() {
        body();
        translate([-1,-10,14.9])
        cube([length+2,40,32]);
        translate([4,4,8.5])
        cube([length-8, width-8,10]);

        translate([-.5,10,7.5])
        rotate([0,90,0])
        cylinder(d = 14.8, h = 2);
        translate([length-1.5,10,7.5])
        rotate([0,90,0])
        cylinder(d = 14.8, h = 2);
    }

            translate([length/4-.2,0.2,14.8])
            cube([3.6,3.6,3.5]);
            translate([length/4*3+.2,0.2,14.8])
            cube([3.6,3.6,3.5]);
            translate([length/4-.2,16.2,14.8])
            cube([3.6,3.6,3.5]);
            translate([length/4*3+.2,16.2,14.8])
            cube([3.6,3.6,3.5]);
    }

        //translate([0,-30,15])
    if(false)
    difference() {
        translate([0,30,-15])
        body();
        translate([-1,20,-32])
        cube([length+2,40,32]);
        translate([-1,20,21.9])
        cube([length/2,40,32]);

            translate([0,30,-15])
            {
            translate([length/4,0,14.8])
            cube([4,4,4]);
            translate([length/4*3,0,14.8])
            cube([4,4,4]);
            translate([length/4,16,14.8])
            cube([4,4,4]);
            translate([length/4*3,16,14.8])
            cube([4,4,4]);
            }
    }

    if(false) {
        if(true) {
    translate([0,0,-22])
    intersection() {
        translate([0,65,-15])
        body();
        translate([-1,55,22])
        cube([length/2,40,32]);
    }
    }
//    translate([5, width+10, 0])
//    rod();
//    translate([15, width+10, 0])
//    rod();

    if(false)
    for(i = [0:2]) {
        translate([10+i*22,-15,0])
        rotate([0,0,0])
        wheel();

        translate([10+i*22,-40,0])
        rotate([0,0,0])
        wheel();

    }
    }

    if(true)
    translate([10,-75,0]) {
    magnet_holder();
    translate([0,16,0])
    magnet_holder();
    }

    if(false) {
        translate([4,-85,0])
        cube([2,180,.4]);

        translate([27,-85,0])
        cube([2,180,.4]);

        translate([46,-85,0])
        cube([2,180,.4]);
    }

}

//print();
train();

if(false) {
    translate([10,-75,0]) {
    magnet_holder();
    translate([0,16,0])
    magnet_holder();
    }
}
```


[User]
Hey, I'm looking to get a parametric spool holder designed for my Printrbot. I really like the general design of the "PrintrbotSpoolHolder_-_tkb2.scad" (and the "tkb1" before it), but I'd like to start from scratch and get a more flexible design.

Here’s the gist of what I’m after:

It needs to mount onto the Printrbot's Z-axis rods, and hold a standard spool of filament above the printer. I want to avoid a design that sticks out to the side, so the spool should be supported from the center. Think of the tkb2 design as a good starting point, but I'd like it to be more flexible from the beginning.

Here's what I have in mind:

**Base and Mounting:**
*   The holder should clamp onto the Z-rods using a two-part design. We can use a standard cylinder with cutouts for the rods, similar to the existing design but with some user-definable parameters for radius of the rods and spacing of the rods.
*  I'd like the base to have a variable thickness too - that way I could set it to match the thickness of the guide arm, or make it thicker for more stability.
*   I'd like to be able to add mounting holes on the base (both perpendicular to the z-rods and also running along the z-rods) in case I need to attach anything later. These should be optional via a variable that can be set to 0. The diameter of these holes should also be variable.

**Spool Holder:**
*   The spool holder itself should be a cylinder on top of the base, with a rounded top. The radius and height of this spool holder should be adjustable parameters.
*   A tapered cone can transition between the spool holder cylinder and the flat base of the mount.

**Guide Arm:**
*   There should be a guide arm extending from one of the base supports (I like how it extends from one of the cylinders in the existing design). The length, thickness, and height of this arm should all be variable.
*   The arm should have a smoothly curved elbow instead of a sharp bend. The radius of this elbow should be a parameter.
*   The filament guide at the end of the arm should be based on sphere hulls for a smooth, easy path. I like the approach in tkb2, but we could make that even more parametric. We can make the sphere diameter for the guide variable, as well as the height offset of the spheres in the z direction and also the separation distance in the x direction. We'll need to make it easy to tweak the cube cutouts too.

**General Requirements:**
*   Everything should be fully parametric, and I'd like to keep things relatively simple to tweak.
*   I'm envisioning this as a single scad file.
*   I’d like to have a variable to control `$fn` for smoothing out curves.
* I would like to use the `hull()` function in openscad to produce smooth curves, so please don't rely on libraries to generate hulls.

Could you help me design this?

[Assistant]
PrintrbotSpoolHolder_-_tkb2.scad:
```
// printrbot spool holder

// updated by Tyler Bletsch
//  - rounded head
//  - adjustable guide arm height
//  - reinforced guide elbow

// updated by Tyler Bletsch 2015-12-05
//  - variable arm thickness
//  - improved arm filament guide shape using sphere hulls
//  - added various 1/4" mounting holes at base and on shaft
//  - guide elbow converted to nice sweeping curve instead of cylinder

$fn = 64*1;

// Radius of spool holder
Rspool=13;

// Height of spool holder
H=100;

// Radius of Z-rods (adjust fit here)
R=6.2;

// Path width of single trace of plastic
w1=.4;

w=w1*4; // 4 traces around for Z shaft holder

// Distance between Z-rods (inside measurement)
D=58;

// Length of guide arm
L=130;

// Height of guide arm
ah = 80;

// Thickness of guide arm, make this 2*(R+w1*4) for a uniform look
th=15.6; // make arm as thick as the base

// Radius of the curve at the elbow of the support
elbow_radius = 15;

// Diameter of the holes put into the base and vertical shaft (used for optionally mounting various stuff with bolts (use ~6.7mm for 1/4" or M6 bolts)). Set to 0 to disable these holes.
hole_dia = 6.7;

d=D/2+R;

difference(){
	union(){
		translate([0,0,17]){
			cylinder(r=Rspool,h=H-Rspool);
            translate([0,0,H-Rspool]) sphere(r=Rspool);
			cylinder(r1=30,r2=0,h=40);
		}
		cylinder(r1=15,r2=30,h=17.01);
		translate([0,0,17/2])cube([2*d,2*(R+w),17],center=true);
		translate([d,0,0])cylinder(r=R+w,h=17);
		translate([-d,0,0])cylinder(r=R+w,h=17);
		translate([d,0,0])rotate([0,0,-45]){
			translate([0,-th/2,0])cube([L-d,th,th]);

            // old ugly guide elbow
            //translate([L-d-th/2,0,th]) rotate([90,0,0]) cylinder(d=20,h=th,center=true);

            // guide elbow
            translate([L-d-th/2+0.1,0,th]) difference() {
                translate([-elbow_radius,-th/2,0]) cube([elbow_radius,th,elbow_radius],center=false);
                translate([-elbow_radius,0,+elbow_radius]) rotate([90,0,0]) cylinder(r=elbow_radius,h=th+1,center=true);
            }
			translate([L-d,0,0])rotate([0,0,90])guide();
		}

        // base perp hole square
        translate([0,0,17/2]) cube([17*2,60,17],center=true);
	}
	translate([d,0,0])cylinder(r=R,h=30,center=true);
	translate([d,0,0])cylinder(r1=2*R+0.8,r2=0.8,h=30,center=true);
	translate([-d,0,0])cylinder(r=R,h=30,center=true);
	translate([-d,0,0])cylinder(r1=2*R+0.8,r2=0.8,h=30,center=true);

    // base perp hole
    translate([17/2,0,17/2]) rotate([90]) cylinder(d=hole_dia,h=80,center=true);
    translate([-17/2,0,17/2]) rotate([90]) cylinder(d=hole_dia,h=80,center=true);

    // shaft holes
    translate([0,0,50]) rotate([90]) cylinder(d=hole_dia,h=80,center=true);
    translate([0,0,70]) rotate([0,90]) cylinder(d=hole_dia,h=80,center=true);
    translate([0,0,90]) rotate([90]) cylinder(d=hole_dia,h=80,center=true);
}

module guide()
difference(){
	translate([-th/2,-th/2,0])cube([th,th,ah]);
	/*
    // old filament guide geometry
    translate([0,0,ah-10])rotate([0,90,0])cylinder(r=3,h=20,center=true,$fn=32);
	hull() {
        translate([0,0,ah-10])rotate([0,135,0])cylinder(r=3,h=20,$fn=32);
        translate([0,0,ah-2])rotate([0,135,0])cylinder(r=3,h=20,$fn=32);
    }
    */
    hull() {
        translate([-th,0,ah-10]) sphere(d=6,$fn=$fn/2);
        translate([0,0,ah-10]) sphere(d=6,$fn=$fn/2);
    }
    hull() {
        translate([0,0,ah-10]) sphere(d=6,$fn=$fn/2);
        translate([th,0,ah-10-th]) sphere(d=6,$fn=$fn/2);
        translate([th,0,ah-10]) sphere(d=6,$fn=$fn/2);
    }
    translate([0,0,ah-10])rotate([-30,0,0])translate([-1,-3,0])cube(th);
    translate([0,0,ah-10])rotate([-30,0,180])translate([-1,-3,0])cube(th);
    translate([0,0,ah-10])rotate([0,45,0])cube([th,th,5]);
	translate([0,0,ah])cube([2,th+1,th+1],center=true);

}
```
PrintrbotSpoolHolder_-_tkb1.scad:
```
// printrbot spool holder

// updated by Tyler Bletsch
//  - rounded head
//  - adjustable guide arm height
//  - reinforced guide elbow

$fn = 64*1;

// Radius of spool holder
Rspool=15;
// Height of spool holder
H=100;
// Radius of Z-rods (adjust fit here)
R=6.2;
// Path width of single trace of plastic
w1=.4;
// Distance between Z-rods (inside measurement)
D=58;
// Length of guide arm
L=130;
// Height of guide arm
ah = 80;

w=w1*4;
d=D/2+R;

difference(){
	union(){
		translate([0,0,17]){
			cylinder(r=Rspool,h=H-Rspool);
            translate([0,0,H-Rspool]) sphere(r=Rspool);
			cylinder(r1=30,r2=0,h=40);
		}
		cylinder(r1=15,r2=30,h=17.01);
		translate([0,0,17/2])cube([2*d,2*(R+w),17],center=true);
		translate([d,0,0])cylinder(r=R+w,h=17);
		translate([-d,0,0])cylinder(r=R+w,h=17);
		translate([d,0,0])rotate([0,0,-45]){
			translate([0,-5,0])cube([L-d,10,10]);
            translate([L-d-5,0,10]) rotate([90,0,0]) cylinder(d=20,h=10,center=true);
			translate([L-d,0,0])rotate([0,0,90])guide();
		}
	}
	translate([d,0,0])cylinder(r=R,h=30,center=true);
	translate([d,0,0])cylinder(r1=2*R+0.8,r2=0.8,h=30,center=true);
	translate([-d,0,0])cylinder(r=R,h=30,center=true);
	translate([-d,0,0])cylinder(r1=2*R+0.8,r2=0.8,h=30,center=true);
}

module guide()
difference(){
	translate([-5,-5,0])cube([10,10,ah]);
	translate([0,0,ah-10])rotate([0,90,0])cylinder(r=3,h=20,center=true,$fn=12);
	translate([0,0,ah-10])rotate([0,135,0])cylinder(r=3,h=20,$fn=12);
	//mirror([0,1,0]){
		translate([0,0,ah-10])rotate([-30,0,0])translate([-1,-3,0])cube(20);
		translate([0,0,ah-10])rotate([-30,0,180])translate([-1,-3,0])cube(20);
		translate([0,0,ah-10])rotate([0,45,0])cube(20);
	//}
	translate([0,0,ah])cube([2,20,20],center=true);

}
```


[User]
Hey, I'm looking to get a parametric OpenSCAD design for a hook. I've been using one I made, but it's not as flexible as I'd like.

The hook needs to have a few key parts:

1.  A main stem that goes up vertically from the base.
2.  A hook portion that curves out from the top of the stem.
3.  A "lip" that goes over the edge of whatever I'm hanging the hook on.

Here's a breakdown of the dimensions I'd like to control with parameters:

*   `lip_thickness`:  The thickness of the lip part, that hooks over the edge.
*   `hook_thickness`:  The thickness of the main hook part.
*   `width`: The width of the hook - this also affects the strength I think.
*   `stem_height`:  The height of the vertical stem part.
*   `hook_diameter`: The diameter of the inside of the hook's curve.
*   `lip_length`: The length of the lip portion, basically how much it needs to go over the edge.
*   `lip_height`:  The height of the back part of the lip.

I'd like the hook to have a rounded end where the curve meets the stem, like a half-cylinder.

Also, I'm using OpenSCAD, so I'd need it to be in a .scad file. I'm not using any special libraries, just straight OpenSCAD code. Could you make the design parametric so I can adjust all of those dimensions, and make the code clean? Thanks!

[Assistant]
hook.scad:
```
//use <tyler.scad>;

$fn=32*1;

E=0.05*1;

// Thickness of the part that goes over whatever you're hanging it on. (mm)
lip_thickness = 7;

// Thickness of the hook part. (mm)
hook_thickness = 7;

// Width of the hook; also basically sets its strength. (mm)
width = 3;

// Height of the stem, i.e. the vertical part on the hook side. (mm)
stem_height = 30;

// How large is the actual hook part, measured as the diameter of the inside of the hook. (mm)
hook_diameter = 16;

// How thick is the thing you're hanging the hook on? (mm)
lip_length = 14;

// Height of the back part of the hook. (mm)
lip_height = 30;

hook_radius = hook_diameter/2;

//stem
cube2([width,stem_height+width,hook_thickness],aligns="LLC");

// hook
translate([-hook_radius,0,0]) {
    difference() {
        cylinder(r=hook_radius+width,h=hook_thickness,center=true);
        cylinder(r=hook_radius,h=hook_thickness+2*E,center=true);
        cube2([hook_diameter+2*width+E,hook_radius+width+E,hook_thickness+2*E],aligns="CLC");
    }
}
// rounded hook end
translate([-hook_diameter-width/2,0,0]) cylinder(d=width, h=hook_thickness, center=true);

// lip
translate([0,stem_height,0]) {
    rotate([0,90,0]) linear_extrude(width) arc(r=lip_thickness/2, a1=180, a2=0);

    translate([0,width,0]) cube2([lip_length+width+width,width,lip_thickness],aligns="LRC");

    translate([lip_length+width,width,0]) cube2([width,lip_height+width,lip_thickness],aligns="LRC");

}

module cube2(size,aligns="LLL",radius=0,xy_radius=0) {
    real_size = len(size) ? size : [size,size,size];
    tr = [
        aligns[0]=="C" ? 0 : aligns[0]=="R" ? (-real_size[0]/2) : (+real_size[0]/2),
        aligns[1]=="C" ? 0 : aligns[1]=="R" ? (-real_size[1]/2) : (+real_size[1]/2),
        aligns[2]=="C" ? 0 : aligns[2]=="R" ? (-real_size[2]/2) : (+real_size[2]/2)
    ];
    translate(tr) {
        if (xy_radius>0) {
            inner_size = [for (v=real_size) v-min(xy_radius*2,v)];
            linear_extrude(real_size[2], center=true) offset(r=xy_radius) square([inner_size[0],inner_size[1]], center=true);
        } else if (radius>0) {
            if (radius*2 >= max(real_size)) {
                resize(real_size) sphere(1);
            } else {
                inner_size = [for (v=real_size) v-min(radius*2,v)];
                minkowski() {
                    cube(inner_size,center=true);
                    sphere(r=radius);
                }
            }
        } else {
            cube(real_size,center=true);
        }
    }
}

module arc(r,a1,a2,ir=0) {
    // normalize to 0..360 (even for negatives)
    a1n = (a1 % 360 + 360) % 360;
    a2n = (a2 % 360 + 360) % 360;
    difference() {
        circle(r);
        if (ir != 0) circle(ir); // if inner radius given, subtract it away

        // get the a1 to interpolate to, adding a revolution if going the long way
        a1next = a2n>a1n ? a1n + 360 : a1n;

        polygon([
            [0,0],
            [cos(1.00*a2n + 0.00*a1next)*2*r,sin(1.00*a2n + 0.00*a1next)*2*r],
            [cos(0.66*a2n + 0.33*a1next)*2*r,sin(0.66*a2n + 0.33*a1next)*2*r],
            [cos(0.33*a2n + 0.66*a1next)*2*r,sin(0.33*a2n + 0.66*a1next)*2*r],
            [cos(0.00*a2n + 1.00*a1next)*2*r,sin(0.00*a2n + 1.00*a1next)*2*r],
        ]);
    }
}

```


[User]
I need a parametric OpenSCAD design for a crank arm magnet holder, specifically for cadence sensors like the Garmin GSC10, but it should be adjustable for different magnet sizes and crank arm thicknesses.

The basic idea is a block that attaches to the crank arm, with a hole to hold the magnet and another hole or slot for a zip tie to secure it to the arm. I'd like to be able to customize:

*   **`crank_offset`:** The distance between the inner face of the crank arm and the outer surface of the magnet.
*   **`magnet_diameter`:** The diameter of the magnet, which will also dictate the size of the magnet hole. I'd like to be able to specify the magnet diameter precisely, and the hole diameter will be calculated to be slightly larger (for example, around 0.2mm) to ensure a snug but not overly tight fit.
*  **`magnet_height`:** The height of the magnet, which will determine the depth of the magnet hole.
* **`arm_thickness`:** The thickness of the crank arm. This should be a parameter, and I'd like the base of the block to be approximately the same thickness.
*   **`tie_slot_width`** and **`tie_slot_height`:** Dimensions for the zip tie slot to pass a tie through.
* **`tie_slot_offset`:** How far back the tie slot starts from the front of the piece.
*   The corners should be rounded. I’m okay with it being a single radius that applies to all of the corners, but I’d like the user to be able to set that radius.

I want the design to be flexible enough to accommodate different magnet sizes, different crank arm thicknesses, and different zip tie sizes. Could you please provide the OpenSCAD code for this design? I'm not particularly attached to any specific libraries, but I am familiar with using the standard built-in OpenSCAD functions.

[Assistant]
crank_arm_magnet.scad:
```

//distance between inside of crank and surface of magnet.
crank_offset=12.5;
//diameter of magnet in mm.  Add about 0.2mm extra to ensure a tigth but not impossible fit.
magnet_diameter=6.55;
//height of magnet in mm
magnet_height=3.2;

difference() {
	translate([-10,-10])
	  v_rounded_cube([20,20,crank_offset],2);
	//magnet hole
	translate([0,0,crank_offset-magnet_height ])
		cylinder(h=magnet_height,d=magnet_diameter,$fn=40);
	//cabletie hole
	translate([-50,-3 ,2 ]) cube([100,6,3]);
}
module v_rounded_cube(xyz,r,$fn=30) {
	z = xyz[2];
	y = xyz[1];
	x = xyz[0];
	translate([r,r])
	hull() {
		cylinder(h=z-r,r=r);
		translate([0,y-2*r])
		cylinder(h=z-r,r=r);
		translate([x-2*r,0])
		cylinder(h=z-r,r=r);
		translate([x-2*r,y-2*r])
		cylinder(h=z-r,r=r);
		translate([0,0,z-r])
		sphere(r);
		translate([0,y-2*r,z-r])
		sphere(r);
		translate([x-2*r,0,z-r])
		sphere(r);
		translate([x-2*r,y-2*r,z-r])
		sphere(r);
	}
}
```


[User]
I need an OpenSCAD design for a parametric washer and then a way to easily print multiple instances of this washer in a grid.

The washer itself should have parameters for:

*   `inner`: the inner diameter of the hole
*   `outer`: the outer diameter of the washer
*   `thickness`: the thickness of the washer

Then, I need a module or script that will let me specify how many washers to print along the X and Y axis. Let's call the parameters for those `volumeX` and `volumeY`.

I’m not sure about this but I want a simple, fast design, and some space between the washers - maybe half the thickness added between the diameters of the washers? I’d like the spacing to be parametric (so that if I wanted to print a lot of things with a single washer, I can change that variable and all of them will space out appropriately). So, maybe call the spacing variable `spacing_factor`, and the spacing itself would be `thickness * spacing_factor`.

So, to summarize, I need a washer module and a print-volume module, both parametric. I’d like this to use simple OpenSCAD code without any external libraries if possible.

[Assistant]
SimpleWasher-VolumePrinter.scad:
```
// diameter in mm
inner = 9;

// diameter in mm
outer = 12;

// thickness in mm
thickness = 2;

volumeX = 4;
volumeY = 2;

module washer (inner, outer, thickness) {

    difference() {
        cylinder(d=outer, h=thickness, $fn=60);
        translate([0,0,-thickness])
        cylinder(d=inner, h=thickness*3, $fn=60);
    };
}

for (i=[1:volumeX]) {
    translate ([outer*(i-1)+thickness/2*i,0,0])
    for (j=[1:volumeY]) {
        translate([0,outer*(j-1)+thickness/2*j,0])
        washer (inner, outer, thickness);
    }
}
```


[User] I need a simple spacer designed in OpenSCAD. It should be a cylindrical tube with a customizable inner diameter, wall thickness, and height. Basically, it should have the form of a cylinder with a cylindrical hole cut through it. I'd like to be able to specify all three dimensions as parameters in the file. I want to be able to easily modify those three dimensions when I need a spacer with different dimensions. Please write an OpenSCAD file for me.

[Assistant]
spacer_simple.scad:
```
//  The inner diameter of the spacer in mm
diameter = 35;

//  The thickness of the spacer in mm
thickness = 5;

//  The height of the spacer in mm
height = 50;

/* [Hidden] */
$fn = 1000;

difference()    {
    color("purple")
        linear_extrude(height = height)
            circle((diameter + thickness)/2, center = true);
color("red")
    translate([0,0,-1])
        linear_extrude(height = height+2)
                circle(diameter/2, center = true);
}
```


[User]
I need an OpenSCAD design for an earring stand, and I'd like it to be parametric so I can adjust it easily.

The basic idea is that it'll have a base stand, and then multiple horizontal hangers extending out from it. The hangers will have holes for hanging earrings.

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

*   **`hangerLength`**: The length of each horizontal hanger.
*   **`hangerHoleSpacing`**: The distance between the earring holes on the hangers.
*   **`holeRadius`**: The radius of the earring holes.
*   **`hangerHeight`**: The vertical thickness of the hanger (not the height of the whole stand).
*   **`hangerWidth`**: The depth (thickness) of the hanger.
*   **`standWall`**: The thickness of the base stand.
*  **`hangerConnectorHeight`**: The height of the connector between the hanger and the stand.
*   **`numHangers`**: The number of hangers in the vertical direction.
* **`standDepth`**: The depth of the base stand
* **`standHeight`**: The height of the base stand

The hangers themselves should be rectangular prisms with cylindrical holes cut out along their length. The hangers should also have short rectangular connector blocks at both ends to secure them to the base stand. The base stand can be a separate shape, a 2D dxf file that can be extruded as a block.

I'd like the base stand to be a dxf file and I will be providing that.

Can you generate a set of parametric OpenSCAD files for this design? I am not using any specific libraries.

[Assistant]
earring_stand.scad:
```
// The length off the hanger
hangerLength = 170;

// Space between the holes
hangerHoleSpacing = 10;

// Radius of the holes
holeRadius = 2;

/* [HIDDEN] */
hangerHeight = 10;
hangerWidth = 3;

standWall = 5;

hangerConnectorHeight = 5;

$fn = 360;

for(i = [0:0]) {
	translate([0, (hangerHeight + 5) * i, 0])
		hanger();
}

module stand() {
	linear_extrude(height = standWall, center = true, convexity = 10)
   	import(file = "stand.dxf");
}

module hanger() {
	difference() {
		cube([hangerLength, hangerHeight, hangerWidth]);

		for(a = [1 : hangerLength / hangerHoleSpacing - 1]) {
			translate([hangerHoleSpacing * a, hangerHeight / 2, -1])
				cylinder(h = hangerWidth + 2, r = holeRadius, $fn=360);
		}
	}

	translate([-standWall, (hangerHeight - hangerConnectorHeight) / 2, 0])
		cube([standWall, hangerConnectorHeight, hangerWidth]);

	translate([hangerLength, (hangerHeight - hangerConnectorHeight) / 2, 0])
		cube([standWall, hangerConnectorHeight, hangerWidth]);
}
```


[User]
Hey, I'm looking for some help designing a tool for my girlfriend's sister, who's a woodworker. She needs a jig to hold four pieces of wood, cut at an angle, while she uses a strop belt to maintain their edges. I've tried my hand at it in OpenSCAD but I'm not super happy with it and it's definitely not parametric.

Ideally, the jig would be designed to:

*   Hold four pieces of wood, each with an angled edge. The angle is likely 45 degrees, but it would be fantastic if it was a configurable parameter.
*   Have a central space, sized to easily place a strop belt inside and remove it after use.
*   Be easily printable, probably in place and without supports, although bridging is fine. The goal is to print 4 of them at a time.
*   Be fully parametric, allowing adjustment of the size to fit different strop belt dimensions and wood piece sizes and angles.

I'm hoping to get some OpenSCAD code that uses the build\_plate module in the `utils` library to help visualize the design on different printers. The specific parameters for the build plate are less important at the design stage, as they can be configured later, but it would be nice to have them there.

I'm looking for the code in the following way: A single scad file containing the definition for a single jig, with all of the parameters.

Basically, the existing code I have attempts to build the jig by taking a big cylinder, a smaller one within it, and cutting it with a cube and four smaller cubes, and then intersecting all that with a bigger cylinder again. The problem is, I'm not sure this approach is the right one, and it really doesn't feel very parametric. The user should be able to set the:
 * Height of the strop belt
 * Outer radius
 * Inner radius
 * Angle to hold the wood (with 4 spaces)

Thanks!

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

// Height of the strop belt
strop_h = 40; // [20:100]

// Render Quality
rendering = 1; // [3:Full, 2:Medium, 1:Draft]

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

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

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

translate ([0,0,-(strop_h*1.2)/2]) build_plate(build_plate_selector,build_plate_manual_x,build_plate_manual_y);

/* hidden */
re = 32;
$fn = re * rendering;

intersection () {
    difference () {
        cube ([strop_h*2.1, strop_h*2.1, strop_h*1.2], center=true);
        cube ([strop_h, strop_h, strop_h*1.21], center=true);
        difference () {
            cylinder (h=strop_h*0.95, r=(strop_h*2)/2, center=true);
            cylinder (h=strop_h*0.96, r=(strop_h*1.7)/2, center=true);
        }
        cube ([strop_h*(1/10), strop_h*4, strop_h*4], center=true);
        cube ([strop_h*4, strop_h*(1/10), strop_h*4], center=true);
        rotate (a=45, v=[0,0,1]) cube ([strop_h*1.45, strop_h*(1/10), strop_h*3], center=true);
        rotate (a=135, v=[0,0,1]) cube([strop_h*1.45, strop_h*(1/10), strop_h*3], center=true);
    }
    cylinder (h=strop_h*1.2, r=(strop_h*2.21)/2, center=true);
}
```


[User]
Hey, I'm trying to design a parametric adapter for a tool holder, specifically to hold a Sharpie pen in my Master Grip tool holder. I've been playing around with some designs, and I think it's time to make it a proper, flexible parametric model.

Basically, the adapter will be a cylinder with a lip at the bottom to interface with the tool holder. Inside the cylinder will be a hole to hold the Sharpie. I'd like to be able to adjust the diameter of the outer cylinder (OD), the diameter of the Sharpie hole (ID), the thickness of the lip (LipThk), the height of the lip (LipHt), and the height of the main adapter portion (Ht). Also, it would be good if the resolution of the cylinders was parametric (I_Res). I'd also like to add some chamfers to the edges to make it look nicer and fit better.

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

*   **OD:** The outer diameter of the main adapter cylinder
*   **ID:** The inner diameter for the Sharpie
*   **LipThk:** The thickness of the lip
*   **LipHt:** The height of the lip
*   **Ht:** The overall height of the adapter portion (not including the lip)
*   **I_Res:** The resolution of the cylinders

I'm thinking the model should be made of two cylinders on top of one another: one for the main adapter and one for the lip. Then, a cylinder is subtracted from the center to create the sharpie hole. The outer bottom lip, the outer top edge and the top and bottom edges of the pen hole should have chamfers.

I also want to be able to create a non-parametric version for a 49mm OD tool holder and a Sharpie Fine Point using mostly the same logic. I found that a 11.2mm ID works well for the pen. The height of the opening above the adapter hole is around 8.38 with an ID of 43. The OD of the Lip was about 55mm with a total height of 28mm. I should also have a relief cut for the tool holder to tighten in. It should be easy to modify that cut.

Could you generate one or more OpenSCAD files for me? Please use rotate\_extrude and circle for the chamfers. No need to include any libraries.

[Assistant]
ToolHolderAdapter_rev2.scad:
```
//Parametric Adapter Tool Holder
//I made this to fit a sharpie in my Master Grip tool holder
//8/24/2015 By: David Bunch
//
//CUSTOMIZER VARIABLES

//1. Diameter of Inserted Adapter
OD = 49.0;

//2. Diameter of opening for smaller tool
ID = 11.2;          //This was a nice somewhat loose fit of a Sharpie Fine Point
                    //10.0 is about the diameter of a Sharpie Ultra Fine Point

//3. Diameter of Lip
LipThk = 3;

//4. Height of Lip
LipHt = 3;

//5. Height of Adapter Portion
Ht = 12.7;

//6. Resolution of Cylinder
I_Res = 64;

//CUSTOMIZER VARIABLES END

TotHt = Ht + LipHt;

LipOD = OD + LipThk + LipThk;
$fn = I_Res;

LipRad = LipOD / 2;

Rad = OD / 2;

RadID = ID / 2;
module DrawUnion()
{
    union()
    {
        cylinder(d=OD,h=TotHt);
        cylinder(d=LipOD,h=LipHt);
    }
}
difference()
{
    DrawUnion();
    translate([0,0,-1])
    cylinder(d=ID,h=TotHt+2);
    translate([-1,-32,-1])
    cube([2,32,TotHt+2]);
//Chamfer the outer bottom lip
    translate([0,0,0])
    rotate_extrude(convexity = 10, $fn = I_Res)
    translate([LipRad, 0, 0])
    circle(r = 1, $fn = 4);
//Chamfer the outer bottom lip
    translate([0,0,3])
    rotate_extrude(convexity = 10, $fn = I_Res)
    translate([LipRad, 0, 0])
    circle(r = 1, $fn = 4);
//Chamfer the outer top edge
    translate([0,0,TotHt])
    rotate_extrude(convexity = 10, $fn = I_Res)
    translate([Rad, 0, 0])
    circle(r = 1.5, $fn = 4);
//Chamfer the top of Tool Adapter
    translate([0,0,TotHt])
    rotate_extrude(convexity = 10, $fn = I_Res)
    translate([RadID, 0, 0])
    circle(r = 1.5, $fn = 4);
//Chamfer the bottom of Tool Adapter
    translate([0,0,0])
    rotate_extrude(convexity = 10, $fn = I_Res)
    translate([RadID, 0, 0])
    circle(r = 1.5, $fn = 4);
}
```
SharpieAdapter_rev8.scad:
```
//Adapter for Sharpie fine point in Master Grip 49mm Dia. Tool holder
//8/24/2015 By: David Bunch

//1. Diameter of Inserted Adapter
OD = 49.0;

//2. Diameter of opening for smaller tool
ID = 11.2;          //This is the diameter of a Sharpie Fine Point
                    //10.0 is the diameter of a Sharpie Ultra Fine Point

//3. Diameter of Opening above Adapter Hole
ID_Above = 43;

//4. Height of Above Opening
Ht_Above = 8.38;

//3. Diameter of Lip
LipOD = 55;

//4. Total Height of Adapter
Ht = 28;

echo("Ht = ", Ht);

//5. Resolution of Cylinder
I_Res = 64;

$fn = I_Res;

LipRad = LipOD / 2;
Rad = OD / 2;
RadID = ID / 2;
module ChamOuter()
{
    translate([0,0,3])
    difference()
    {
        cylinder(d=55,h=28);
        translate([0,0,-1])
        cylinder(d=48.1175,h=5.8557);
        translate([0,0,4.85])
        cylinder(d1=48.1175,d2=19.126,h=14.2);
        translate([0,0,-1])
        cylinder(d=19.126,h=35);
    }
}
module DrawUnion()
{
    union()
    {
        cylinder(d=LipOD,h=3);
        cylinder(d=OD,h=4.4228);
        translate([0,0,4.4228])
        cylinder(d1=OD,d2=28.2238,h=10.189);
        translate([0,0,14.6119])
        cylinder(d1=28.2238,d2=OD,h=10.3881);
        translate([0,0,25])
        cylinder(d=OD,h=3);
    }
}
module DrawFinal()
{
    difference()
    {
        DrawUnion();
        translate([0,0,-1])
        cylinder(d=ID,h=Ht+2);
//Cut for space above Tool Holder
        translate([0,0,-1])
        cylinder(d=ID_Above,h=2.55);

        translate([0,0,1.55])
        cylinder(d1=ID_Above,d2=ID,h=16.15);
//Cut 3mm opening for tightening in tool holder
        translate([-1.5,-32,-1])
        cube([3,32,Ht+2]);
//Chamfer the outer bottom lip
        translate([0,0,0])
        rotate_extrude(convexity = 10, $fn = I_Res)
        translate([LipRad, 0, 0])
        circle(r = 1, $fn = 4);
//Chamfer the outer bottom lip
        translate([0,0,3])
        rotate_extrude(convexity = 10, $fn = I_Res)
        translate([LipRad, 0, 0])
        circle(r = 1, $fn = 4);
//Chamfer the top of Sharpie holder
        translate([0,0,Ht])
        rotate_extrude(convexity = 10, $fn = I_Res)
        translate([RadID, 0, 0])
        circle(r = 1.5, $fn = 4);
//Chamfer the bottom of Sharpie holder
        translate([0,0,16.2])
        cylinder(d1=ID+3,d2=ID,h=2.134);
    //cube([60,60,60]);             //Cut a quarter section of part
    }
}
DrawFinal();
```


[User]
I need a parametric OpenSCAD design for a coffee stencil.

The design should be a cylindrical stencil with a handle, and cut out text in the center. Here's a breakdown of the parameters:

*   **`Text`**: The text that will be cut out. This should be a string.
*   **`Font`**: The font used for the text. I want to be able to use stencil fonts, specifically from this list: `Allerta Stencil, Stardos Stencil, Sirin Stencil, Emblema One, Keania One, Passero One, Baumans, Expletus Sans, Plaster, Wallpoet, Codystar, Megrim`.
*   **`Spacing`**: A float that controls the spacing between characters. This would default to 1.05, but the user should be able to adjust the spacing between 0.8 and 1.2.
*   **`Size`**: An integer representing the font size. This should default to 26 and range from 6 to 48.
*   **`Height`**: An integer representing the height of the stencil. This should default to 2 and should be adjustable between 1 and 3.
*   **`Dia`**: An integer representing the diameter of the stencil. It should default to 83 (mug size), but should also be adjustable to 62 (small cup size).

The stencil itself will be a cylinder with a supporting piece on the side. The side support should be a half cylinder on the side of the main cylinder, with a supporting piece of a rectangular prism for additional strength. There should also be a small cylindrical hole through the side support.

The text should be centered both horizontally and vertically within the stencil. The text will be cut out by difference, creating a stencil pattern.

Can you generate the OpenSCAD file for me? I'm using OpenSCAD 2015.03.

[Assistant]
coffee_stencil.scad:
```
// Font
Text = "xyz";

Font = "Allerta Stencil"; // [Allerta Stencil, Stardos Stencil, Sirin Stencil, Emblema One, Keania One, Passero One, Baumans, Expletus Sans, Plaster, Wallpoet, Codystar, Megrim]

// Spacing between characters
Spacing = 1.05; //[0.8, 0.85, 0.9, 0.95, 1, 1.05, 1.1, 1.15, 1.2]

// Font size
Size = 26; // [6:48]

// Stencil height
Height = 2; //[1,2,3]

// Stencil diameter (62 -- small cup, 83 -- mug)
Dia = 83; //[62,83]

module stencil() {
    union() {
        cylinder(d=Dia, h=Height, $fn=100);
        translate([Dia*0.5,0,Height/2]) cube([Dia*0.5, Dia*0.2, Height], center=true);
        translate([Dia*0.75,0,0]) cylinder(d=Dia*0.2, h=Height, $fn=100);
    }
}

difference() {

stencil();
    translate([0, 0, -1]) linear_extrude(height=Height+2) {
        text(size=Size, text=Text, font=Font, halign = "center", valign="center", spacing=Spacing, $fn=100);
    }
    translate([Dia*0.75,0,0]) cylinder(d=5, h=Height, $fn=100);
}

```


[User]
Hey, I'm looking to get a flexible coupling designed for 3D printing. I've got a bit of a specific idea in mind, and I'd love for it to be parametric. I've seen some similar designs, but I need more control over the dimensions.

Essentially, I need a coupling with:

*   **Variable Shaft Diameters:** The top and bottom holes should have independent diameters, so I can connect shafts of different sizes. I'd also like the option to have a "D" shaped bore instead of a simple cylinder, with a configurable depth of the D cut.

*   **Flexible Core:** The core of the coupling should use a spiral design to provide flexibility. I want to be able to control the number of spirals and their twist angle.

*   **Captive Nuts:** It should have recesses for captive nuts, and be able to use either hex or square nuts. I need to control the nut size and thickness, too. Also, it would be helpful if the position of the nut could be slightly adjusted radially.

*   **Recessed Bolts:** The bolts should be recessed into the coupling, and it would be great if the bolt holes could be simplified to a hex shape for easier printing (no supports needed). I'd need to control the bolt diameter and recess depth, naturally.

*   **Printability:** This needs to be designed to be printable without supports, or with minimal support. It should also be optimized to be reasonably fast and easy to print.

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

*   `Outer_diameter`: The overall diameter of the coupling.
*   `Total_height`: The total height of the coupling.
*   `Base_height`: The height of each of the end blocks.
*   `Num_spiral`: The number of flexible spirals in the core.
*  `Spiral_degree`: The twist angle of the spirals in degrees.
*   `Upper_shaft_dia`: The diameter of the hole at the top of the coupling.
*   `Upper_D`: Boolean to make the upper shaft a D shape.
*   `Upper_shaft_D_depth`: The depth of the D cut on the upper shaft.
*   `Lower_shaft_dia`: The diameter of the hole at the bottom of the coupling.
*   `Lower_D`: Boolean to make the lower shaft a D shape.
*   `Lower_shaft_D_depth`: The depth of the D cut on the lower shaft.
*   `Bolt_diameter`: The diameter of the locking bolts.
*   `Nut_type`: The type of captive nut, either "hex" or "square."
*   `Nut_diameter`: The width of the captive nut.
*   `Nut_thickness`: The thickness of the nut.
*   `Nut_position_tweak`: A tweak to the radial position of the nut slot.
*   `Bolt_recess`: The depth of the bolt head recess.
*   `Simplify_printing`: Boolean to make bolt holes hex-shaped to simplify printing
*   `Show_Cross_section`: Boolean to show a cross section of the coupling

I'm hoping you can generate a parametric OpenSCAD file that allows me to control all of these settings. It'd also be fantastic if you could include clear comments in the code to make it easy to understand. I don't need a GUI or anything fancy, just a well-written, parameterized OpenSCAD model. I'd rather you didn't just try to re-write the original, but that you generated it from scratch. I'm not using any particular libraries, just the standard OpenSCAD functions.

[Assistant]
Flexible_Coupling.scad:
```
// Flexible Coupling with ideas taken from
// - Gyrobot - http://www.thingiverse.com/thing:38678
// - MarcoAlici - http://www.thingiverse.com/thing:44078

// Features:
// - top and bottom independent hole diameters
// - smooth exterior spirals for coupling
// - hex or square captive nuts
// - recessed bolts
// - optimisations for no support printing
// - D shafts optional

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

/* [Base Dimensions] */
// Outer diameter of Coupling
Outer_diameter = 22;
// Total height of coupling.
Total_height = 30;
// Height of each end block
Base_height  = 8;
// Number of flexible spirals in core.
Num_spiral = 7;
// Twistyness of the Spirals(degrees). The longer and thinner the spiral arms are -  the springier the resulting coupling will be.
Spiral_degree = 90;

/* [Upper Shaft] */
// Diameter of hole at top of coupling
Upper_shaft_dia = 8;
// Does the upper shaft have a D shape
Upper_D  = "yes"; // [yes,no]
// Width from face of D to back of shaft
Upper_shaft_D_depth = 7.5;
// Diameter of hole at top of coupling

/* [Lower Shaft] */
Lower_shaft_dia = 5;
// Does the lower shaft have a D shape
Lower_D  = "yes"; // [yes,no]
// Width from face of D to back of shaft
Lower_shaft_D_depth = 4.5;

/* [Fixings] */
// Diameter of the locking bolts (top and bottom)
Bolt_diameter = 3.1;
// Type of captive Nut. Hex or square(slot shape)
Nut_type = "hex"; // [hex, square]
// Width of the captive Nut (gripping the locking bolt)
Nut_diameter  = 6.6;
// Thickness of Nut
Nut_thickness  = 2.6;
// Tweak to radial position of Nut slots. (Maximize space between slot and outer surface).
Nut_position_tweak  = 1; //[-3:0.5:3]

/* [Details] */
// Bolt head recess. (If enough room)
Bolt_recess = 1.5;
// Simplify printing by making bolt hole hex shape.(no support)
Simplify_printing = "no"; // [yes,no]
// Show cutaway for clarity
Show_Cross_section = "no"; //[yes, no]

/* [Hidden] */
Delta = 0.1;				// Adj for geometry overlaps so F6 works well.
Resolution = 80;			// for cylinders
Max_hole = max(Upper_shaft_dia, Lower_shaft_dia);
Upper_shaft_D_offset = (Upper_D == "yes") ? Upper_shaft_D_depth - Upper_shaft_dia/2 : 0;
Lower_shaft_D_offset = (Lower_D == "yes") ? Lower_shaft_D_depth - Lower_shaft_dia/2 : 0;

//---------------------------
// The Spring Coupling
module square_spring(inner_R, outer_R, height, angle, numspirals) {
	num_slices = round((50*height/Resolution + 20*Spiral_degree/height)/3);
	//echo(num_slices, 50*height/Resolution, 20*Spiral_degree/height);
	intersection(){
		translate([0,0,-Delta])
			cylinder (d=Outer_diameter, h=height+2*Delta, center=false, $fn=Resolution);
		// spiral
		ext = Outer_diameter*0.5 / Num_spiral;
		linear_extrude(height=height, center=false, convexity=1, twist=angle, slices=num_slices)
			polygon([[inner_R, 0],
					 [outer_R+ext, 0],
					 [outer_R*cos(180/numspirals)+ext, outer_R*sin(180/numspirals)],
					 [inner_R*cos(180/numspirals),     inner_R*sin(180/numspirals)]
					]);
	}
}

// The grub screw holes and slots
module screw_hole(dia, res=Resolution) {
	pos = dia/2;
	offset = (pos + Max_hole/2)/2;
	// hex or square captive nut
	nut_res = (Nut_type == "hex") ? 6 : 4;
	nut_rotate = (Nut_type == "hex") ? 0 : 45;
	slot_size = (Nut_type == "hex") ? cos(30) : cos(45);
	rotate([0,90,0]) {
		// bolt hole (grub screw)
		translate ([-Base_height/2,0,offset])
			cylinder(d=Bolt_diameter, h=pos*1.2,center=true, $fn=res);
		// Bolt head recess (if room)
		translate ([-Base_height/2,0,Outer_diameter/2-Bolt_recess/2+Delta])
			cylinder(d=Bolt_diameter*2, h=Bolt_recess+Delta*2,center=true, $fn=res);
		// Hex Nut Recess
		translate([-Base_height/2-Delta, 0, offset-Nut_position_tweak])
		rotate([0,0,nut_rotate])
			cylinder(d=Nut_diameter, h=Nut_thickness, center=true, $fn=nut_res); // hex nut
		// Slot for Nut entry
		translate([0,0,offset-Nut_position_tweak])
			cube(size=[Base_height, Nut_diameter*slot_size, Nut_thickness], center=true);
	}
}

module end(dia, hole_dia, D_flat_pos, res=Resolution) {
	difference() {
		union() {
			difference(){
				cylinder (d=dia, h=Base_height, center=false, $fn=res); // main cyl
				// remove central hole
				translate([0,0,-Delta])
					cylinder(d=hole_dia, h=Base_height+2*Delta, center=false, $fn=res);
			}
			// "D" flat-face on shaft
			if (D_flat_pos != 0) {
				translate([D_flat_pos,-hole_dia/2,0])
					cube(size=[hole_dia/2, hole_dia, Base_height], center=false);
			}
		}
		// subtract screw hole and slot
		boltres = (Simplify_printing == "yes") ? 6 : res;
		screw_hole(dia, boltres);
	}
}

//--------------------------
// The Coupling
difference() {
	union() {
		// top block
		end(Outer_diameter, Lower_shaft_dia, Lower_shaft_D_offset);
		// bottom block (flipped over)
		translate([0,0,Total_height])
		rotate([0,180,0])
			end(Outer_diameter, Upper_shaft_dia, Upper_shaft_D_offset);
		// Spring
		spring_height = Total_height - 2*Base_height;
		for (i=[1:Num_spiral])  {
			rotate([0,0,360*i/Num_spiral])
			translate ([0,0,Base_height-Delta])
				square_spring(Max_hole/2, Outer_diameter/2, spring_height+2*Delta, Spiral_degree, Num_spiral);
		}
	}
	//
	if (Show_Cross_section == "yes") {
		dim = max(Outer_diameter, Total_height);
		rotate([0,0,-90])
		translate([0, -dim/2, -Delta])
			cube(size=dim+2*Delta);
	}
}

```


[User]
I'm looking to create a cord clip that attaches to a cylindrical stand, like a microphone stand. I have a specific design in mind that I'd like to be parametric in OpenSCAD.

The clip should essentially wrap around the stand with an opening that allows it to be attached. Then, there should be a second, smaller circle extending from the main body to hold the cord. It's important that both the stand and cord openings can be defined by their diameters. There needs to be some extra clearance to hold the cord snugly, but not too tight, so let's make that adjustable as well. The clip should have a configurable width to fit different stand types. Finally, I’d like to specify the opening size as a percentage of the post diameter. Also, it needs a minimum thickness parameter so that it’s sturdy enough after printing.

Specifically, I need the following parameters:

*   `post_diameter`: The diameter of the stand the clip will attach to (in mm).
*   `cord_diameter`: The diameter of the cord the clip will hold (in mm).
*   `add_clearance`: Extra room for the cord (in mm).
*   `clip_width`: The width of the clip (in mm).
*   `opening_percent`: The size of the opening for the stand, specified as a percentage of the post diameter (e.g., 0.7 for 70%).
*   `min_thickness`: The minimum thickness of the clip (in mm).

I’d like the OpenSCAD code to:

1.  Create the main body of the clip that wraps around the stand.
2.  Add the smaller circle to hold the cord, positioned such that the cord rests against the main body.
3.  Use the `opening_percent` to create an appropriately sized opening on the main body.
4.  Ensure the clip maintains a minimum thickness defined by `min_thickness` parameter.
5.  Be easily customizable by changing the parameters at the beginning of the file.

I'm hoping this isn't too complicated. I'd prefer to use just the core OpenSCAD language for this without relying on any external libraries. Could you provide me with a single .scad file that implements this design?

[Assistant]
mic_stand_cord_clip.scad:
```
//
// Mic stand cord clip
// version 1.0   8/27/2015
// by daozenciaoyen
//

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

/* [Main] */
// (in mm)
post_diameter = 19 ; // [5:0.5:40]
// (in mm)
cord_diameter = 8 ; // [5:0.5:20]
// extra cord room (in mm)
add_clearance = 0 ; // [0:0.5:10]
// (in mm)
clip_width = 8 ; // [2:2:40]
// (in pct of post diameter)
opening_percent = 0.7 ; // [0.5:0.05:0.95]
// (in mm)
min_thickness = 2.5 ; // [2:0.5:10]

/* [Hidden] */
pd = post_diameter ;
cd = cord_diameter ;
ac = add_clearance ;
cw = clip_width ;
op = opening_percent ;
mt = min_thickness ;

opd = pd+mt*2 ; // outer post diameter
ocd = cd+mt*2 ; // outer cord diameter
pr = pd/2 ; // post radius
cr = cd/2 ; // cord radius
ol = pd*op ; // opening length
oa = asin((ol/2)/pr) ; // opening angle
ff = .1 ; // fudge factor

$fn = 32 ;

main();

module main()
{
  linear_extrude(height=cw)
    union() {
      difference() {
        hull() {
          circle(d=opd);
          translate([pr+cr+ac,0,0]) circle(d=ocd);
        }
        circle(d=pd);
        translate([pr+cr+ac,0,0]) circle(d=cd);
        translate([0,-cr,0]) square([pr+cr+ac,cd]);
        pie(opd/2,oa*2,180) ;
      }
      rotate([0,0,oa]) translate([-pr-mt/2,0,0]) circle(d=mt);
      rotate([0,0,-oa]) translate([-pr-mt/2,0,0]) circle(d=mt);
    }
}

module pie(r,d,c)
{
  r = r + ff ; // radius
  // d = degrees (0-180)
  // c = angle of center of slice
  echo(d=d);
  rotate([0,0,180+d/2+c])
  difference() {
    intersection() {
      translate([-r,0,0]) square([r*2,r]);
      circle(r+ff);
    }
    rotate([0,0,180-d])
      translate([-r,-r,0]) square([r*2,r]);
  }
}
```


[User]
I need an OpenSCAD design for a parametric fan adapter for an E3D style hotend. I've seen a few designs, but I need one that is customizable for different fan sizes, heatsink diameters and heights, and a few other parameters.

Essentially, the adapter will fit around the cylindrical heatsink of an E3D hotend and mount a cooling fan to it. The adapter should be able to be customized to fit different sizes of fans, and the parameters for the heatsink should be customizable as well.

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

*   `heatbreak_h`: Height of the heatbreak section (if any) to cool, this would extend the adapter downwards. This can be 0 if the user doesn't need to cool the heatbreak.
*   `fansize`:  The overall size of the fan (e.g. 40mm, 50mm)
*   `fanhole_d`: The diameter of the circle where the fan mounts.
*   `fancurve`: The radius of the curve on the fan mounting face.
*    `fanscrew`:  The distance between fan screw holes.
*   `fanscrew_d`:  The diameter of the fan screw holes
*   `length`: The length of the heatsink adapter.
*   `e3d_d`:  The diameter of the heatsink.
*   `e3d_h`: The height of the heatsink.
*   `e3d_shiftx`: An offset for the position of the heatsink in the x direction, used to adjust position if not centered on the fan.
*   `e3d_shifty`:  An offset for the position of the heatsink in the y direction, used to adjust position if not centered on the fan.

The design should use `hull()` to smoothly connect the fan mounting face to the heatsink adapter. I'd also like the heatsink adapter to have an internal lip on the heatsink side to keep it aligned, not sure how best to describe that.  If `heatbreak_h` is greater than zero, I'd like a cooling channel to be created underneath the fan for the heatbreak.

For the basic shape, I'm imagining a sort of rounded rectangle for the fan, and then a cylinder for the heatsink which is then blended together by the `hull()`.  I want to use `minkowski()` with a cylinder to create the rounded edges for the fan shape.

I do not need any specific libraries, the base OpenSCAD features should be sufficient.

[Assistant]
e3d_fan.scad:
```
// E3D Fan adapter v1.1 (21/09/2015)

/* [Main] */
$fn=100;
// (fan heatbreak height)
heatbreak_h=0; // [0:0.5:5]
// (fan size in mm)
fansize=40; //  [30:5:60]
// (fan hole diameter in mm)
fanhole_d=38; //  [25:1:60]
// (fan angle curve, radius in mm)
fancurve=3; // [0:0.5:6]
// (fan screw length in mm)
fanscrew=32; // [25:1:60]
// (fan screw diameter in mm)
fanscrew_d=3.3; // [2:1:5]
// (length adapter in mm)
length=10; // [0:1:40]
// (heatsink diameter + gap in mm)
e3d_d=22.7; // [15:0.5:30]
// (heatsink height in mm)
e3d_h=26; // [20:0.5:30]
// (shift x in mm)
e3d_shiftx=0; // [0:1:20]
// (shift y in mm)
e3d_shifty=0; // [0:1:20]

// V my ?
//e3d_d=25;
//e3d_h=32;
// V6
//e3d_d=22.5;
//e3d_h=26;

difference(){
	union(){
		hull(){
			translate([fancurve,fancurve,0]) minkowski()
			{
				cube([fansize-fancurve*2,fansize-fancurve*2,2]);
				cylinder(h=2, r=fancurve);
			}
			translate([(fansize-e3d_d)/2-3+e3d_shiftx,(fansize-e3d_h-1)/2+e3d_shifty,length]) cube([e3d_d+6,e3d_h+1,.01]);

		}
		hull(){
			translate([(fansize-e3d_d)/2-3+e3d_shiftx,(fansize-e3d_h-1)/2+e3d_shifty,length]) cube([e3d_d+6,e3d_h+1,.01]);
			rotate([90,0,0]) translate([fansize/2+e3d_shiftx,length+e3d_d/2,-fansize/2-e3d_shifty]) cylinder(h=e3d_h+1, d=e3d_d+4, center=true);
		}
		if (heatbreak_h > 0){
			hull(){
				translate([fansize/2-6+e3d_shiftx/2,fansize/2+e3d_shifty/2,0]) cube([12,heatbreak_h+1,4]);
				translate([fansize/2+e3d_shiftx-6,fansize/2+(e3d_h+1)/2+e3d_shifty-1-.02,length-4]) cube([12,heatbreak_h+1,4]);
			}
		}
	}
// heatbreak cooling
	if (heatbreak_h > 0){
		hull(){
			translate([fansize/2-5+e3d_shiftx/2,fansize/2+e3d_shifty/2,0]) cube([10,heatbreak_h,4]);
			translate([fansize/2+e3d_shiftx-5,fansize/2+(e3d_h+1)/2+e3d_shifty-1,length-4]) cube([10,heatbreak_h,5]);
		}
	}
// heatsink
	rotate([90,0,0]) translate([fansize/2+e3d_shiftx,length+e3d_d/2,-fansize/2-(e3d_h+1)/2-e3d_shifty-.01]) cylinder(h=e3d_h, d=e3d_d);
	rotate([90,0,0]) translate([fansize/2+e3d_shiftx,length+e3d_d/2,-fansize/2+(e3d_h+1)/2-e3d_shifty-1-.02]) cylinder(h=1+.03, d=e3d_d-3);
// fan hole
	translate([fansize/2,fansize/2,-.01]) cylinder(h=2, d=fanhole_d);
// fan screw
	translate([(fansize-fanscrew)/2,(fansize-fanscrew)/2,-.01]) cylinder(h=10, d=fanscrew_d);
	translate([(fansize-fanscrew)/2,fansize-(fansize-fanscrew)/2,-.01]) cylinder(h=10, d=fanscrew_d);
	translate([fansize-(fansize-fanscrew)/2,(fansize-fanscrew)/2,-.01]) cylinder(h=10, d=fanscrew_d);
	translate([fansize-(fansize-fanscrew)/2,fansize-(fansize-fanscrew)/2,-.01]) cylinder(h=10, d=fanscrew_d);
//
	translate([-1+e3d_shiftx,-1+e3d_shifty,length-2+e3d_d*0.8]) cube([fansize+e3d_shifty+10,fansize+e3d_shifty+10,20]);
//
	hull(){
		translate([fansize/2,fansize/2,2-.02]) cylinder(h=0.01, d=fanhole_d, center=true);
		translate([(fansize-e3d_d)/2-3+2+e3d_shiftx,(fansize-e3d_h-1)/2+2+e3d_shifty,length]) cube([e3d_d+6-4,e3d_h-2+.01,.01]);
	}
	hull(){
		translate([(fansize-e3d_d)/2-3+2+e3d_shiftx,(fansize-e3d_h-1)/2+2+e3d_shifty,length]) cube([e3d_d+6-4,e3d_h-2+.01,.01]);
		translate([(fansize-e3d_d)/2+e3d_shiftx+1,(fansize-e3d_h-1)/2+2+e3d_shifty,length]) cube([e3d_d-2,e3d_h-2+.01,e3d_d/3]);
	}
}

```


[User]
Hey, I'd like to create a custom, polygonal bowl using OpenSCAD. I'm thinking something similar to the example I saw, but with some tweaks.

I'd need to be able to control a few things:

*   **Size:** I want to set the overall diameter of the bowl and the height of the main body, base, and rim separately.
*   **Shape:** I want to pick the number of sides for the polygon (like a pentagon, hexagon, etc.) and control the thickness of the material.
*   **Style:** I'd like to twist the body of the bowl as it extrudes upwards and control how much it flares outwards.

So basically, the adjustable parameters should be:

*   `diameter` (mm) - The overall width of the bowl.
*   `bodyHeight` (mm) - The height of the main section.
*   `baseHeight` (mm) - The height of the base.
*   `rimHeight` (mm) - The height of the top rim.
*   `sides` - The number of sides for the polygon.
*   `thickness` (mm) - The thickness of the bowl walls.
*   `bodyTwist` (degrees) - How much the body twists as it goes up.
*   `bodyFlare` - A scaling factor to make the bowl flare out (or in).

The output should be a solid, printable 3D model. Can you generate the OpenSCAD code for this? I don't think I need any external libraries.

[Assistant]
simple_custom_polybowl_customizer.scad:
```
// simple custom polybowl

/* [Size] */

// width of the bowl (in mm)
diameter = 32;
radius = diameter/2;

// height of the main part (in mm)
bodyHeight = 50;

// height of the base and lower rim (in mm)
baseHeight = 1;

// height of the upper rim (in mm)
rimHeight = 1;

/* [Style] */

// number of polygon sides
sides = 5;

// thickness of the bowl (keep above 1.5 mm)
thickness = 1.5;

// degrees that the bowl shape will twist
bodyTwist = 36;

// factor by which bowl shape will scale out/in
bodyFlare = 1.8;

//////////////////////////////////////////////////////
// RENDERS

// base
linear_extrude( height = baseHeight )
    polyShape( solid="yes" );

// body
translate([0,0,baseHeight])
linear_extrude( height = bodyHeight, twist = bodyTwist,
                scale = bodyFlare, slices = 2*bodyHeight )
    polyShape( solid="no" );

// rim
translate([0,0,bodyHeight+baseHeight])
rotate(-bodyTwist)
scale(bodyFlare)
linear_extrude( height = rimHeight )
    polyShape( solid="no" );

//////////////////////////////////////////////////////
// MODULES

module polyShape(solid){
    difference(){
        // start with outer shape
        offset( r=5, $fn=48 )
            circle( r=radius, $fn=sides );
        // take away inner shape
        if (solid=="no"){
        offset( r=5-thickness, $fn=48 )
            circle( r=radius, $fn=sides );
        }
    }
}

```


[User]
I'm trying to make a mold for casting sand, and I've been playing around with some OpenSCAD. I want to make a mold for a basic octahedron, but I want to make it in two halves that can be bolted together. I have the basic idea of how to use `polyhedron()` to get the shape, but I'm a bit stuck on how to make it parametric and add the bolting features. Also, I'm kind of new to this so I don't know what the best approach would be.

Here's what I'm thinking:

The octahedron should have an adjustable inner radius. I'd like to be able to control the thickness of the mold itself. Also, I'd like to have an adjustable number of bolt holes on the mating surface, evenly spaced. I think the bolts themselves should also have adjustable sizes.

I'm not sure whether it's better to create a single file or split it into parts. If you think it's best to split it up, I'd appreciate if the main file could use a `module` to include the pieces. I also want to be able to easily change these parameters in the top-level file.

For libraries, I'm comfortable using BOSL2 for any utility functions you think would be helpful.  I'm not sure what else would be useful for this project.

Can you generate the OpenSCAD files for this?

[Assistant]
OctahedronMold.scad:
```
inside_radius = 20; //[1:100]
thickness=3; //[1:10]

translate([inside_radius+2*thickness,0,0])
polyhedron(
  points=concat(inside_radius*[ [1,0,0],[0,-1,0],[-1,0,0],[0,1,0], // the four points at base
           [0,0,1]  ],     // the apex point
              (inside_radius+thickness)*[ [1,0,0],[0,-1,0],[-1,0,0],[0,1,0], // the four points at base
           [0,0,1]  ]),     // the apex point
  faces=[ [0,1,4],[1,2,4],[2,3,4],[3,0,4],              // each triangle side
          [0,4,1]+[5,5,5],[1,4,2]+[5,5,5],[2,4,3]+[5,5,5],[3,4,0]+[5,5,5],
          [1,0,5,6], [2,1,6,7],[3,2,7,8],[0,3,8,5]  ]
 );

 translate(-1*[inside_radius+2*thickness,0,0])
polyhedron(
  points=concat(inside_radius*[ [1,0,0],[0,-1,0],[-1,0,0],[0,1,0], // the four points at base
           [0,0,1]  ],     // the apex point
              (inside_radius+thickness)*[ [1,0,0],[0,-1,0],[-1,0,0],[0,1,0], // the four points at base
           [0,0,1]  ]),     // the apex point
  faces=[ [0,1,4],[1,2,4],[2,3,4],[3,0,4],              // each triangle side
          [0,4,1]+[5,5,5],[1,4,2]+[5,5,5],[2,4,3]+[5,5,5],[3,4,0]+[5,5,5],
          [1,0,5,6], [2,1,6,7],[3,2,7,8],[0,3,8,5]  ]
 );
```


[User]
Hey, I'm looking to create a parametric design for an indexing rack, similar to the Incra setup gauge but custom-built for 3D printing. I have an existing OpenSCAD file as a starting point (I can paste it in if needed), but I'd prefer a cleaner design with better modularity, probably using libraries if that makes sense.

Here's what I need:

**Overall Design:**

*   The rack should be a long, toothed piece with screw holes for mounting.
*   It should be fully parametric, allowing me to adjust all key dimensions.
*   I want to be able to specify the overall length, width, and the height of the base under the teeth.

**Teeth:**

*   I need to be able to define the teeth per inch (tpi).
*   The teeth should be able to be angled to create a ratchet effect (user specified angle).
*   I need to specify the height of the teeth. If the tooth height is set to zero, then make it the same as the width.
*   I want a way to clip the tooth tips (parameter for percentage of tooth width to clip).

**Screws:**

*   I should be able to toggle screw holes on/off.
*   I need parameters for screw diameter and screw head diameter (both in mm).
*   I need to be able to control the distance of the screw holes from the ends (inset).
*   I'd like to specify either the number of screws or the spacing between screws, with the other being calculated.

**Libraries:**

*   I'm open to using external libraries. It seems like BOSL2 would probably be the best to handle this type of design, but I'm fine if you think something else is better.

Could you generate the necessary OpenSCAD files for this? I'd like a clean implementation that leverages the chosen library to its fullest. I'm happy to clarify anything if needed!

Thanks!

[Assistant]
incramental_rack.scad:
```

/* [main] */

// Overall length (inches)
length=6;

// Overall width (inches)
width=0.5;

// How thick the slab under the teeth is. (inches) If 0, same as tooth height.
spine_height=0;

/* [teeth] */

// How many teeth per inch
tpi=16;

// Tilt the teeth to achieve a ratchet effect (100% is a 90 degree angle)
ratchet_percent=0; // [-150..150]

// How tall the teeth are. (inches) If 0, will be the same as width, giving avg 45 degree angles.
tooth_height=0;

// Percent of tooth tip to clip off (prevent sharp edge and allow for dirt)
clip_percent=15; // [0..100]

/* screw holes */

// Turn screw holes on/off
use_screws=1; // [0:off,1:on]

// How big around the screw is (millimeters)
screw_dia=3.5;

// How big the screw head is (millimeters)
screw_head_dia=6;

// How far the screws are in from the ends (inches)
screw_inset=0.5;

// How many screws. If 0, will calculate based on screw_spacing
num_screws=0;

// Distance between screws (inches)
screw_spacing=1;

/* hidden */

function in2mm(in)=25.4*in;

module frustum(x,y,x2,y2,z) {
	halfx=x/2;
	halfy=y/2;
	halfx2=x2/2;
	halfy2=y2/2;
	polyhedron(points=[
		[ halfx,halfy,0],
		[-halfx,halfy,0],
		[-halfx,-halfy,0],
		[ halfx,-halfy,0],
		[ halfx2,halfy2,z],
		[-halfx2,halfy2,z],
		[-halfx2,-halfy2,z],
		[ halfx2,-halfy2,z]
	], faces=[
		[0,2,1],[0,3,2], // top
		[0,4,3],[3,4,7], // east
		[0,5,4],[0,1,5], // north
		[1,6,5],[1,2,6], // west
		[2,7,6],[2,3,7], // south
		[4,5,6],[4,6,7] // bottom
	]);
}

module tooth(height,bottom_width,top_width=0.001,ratchet_percent=0){
	tw2=top_width/2;
	bw2=bottom_width/2;
	twr=bw2*ratchet_percent;
	polygon(points=[[height,twr-tw2],[height,twr+tw2],[0,bw2],[0,-bw2]],paths=[[0,1,2,3]]);
}

module screwHole(dia=3.5,head_dia=6,len=20,outset=0,$fn=32){
	head_height=(head_dia-dia)/2; // 45 degrees makes things simple
	cylinder(r=dia/2,h=len);
	translate([0,0,len-head_height]) cylinder(r2=head_dia/2,r1=dia/2,h=head_height);
	if(outset>0){
		translate([0,0,len]) cylinder(r=head_dia/2,h=outset);
	}
}

module teeth(spine_height,tpi,height,length,thickness,clip_percent=0.1,ratchet_percent=0){
	length=in2mm(length);
	spine_height=in2mm(spine_height);
	height=in2mm(height);
	thickness=in2mm(thickness);
	tooth_width=in2mm(1/tpi);
	rotate([0,0,-90]) rotate([0,-90,0]) linear_extrude(thickness){
		for(i=[0:tooth_width:length-0.001]){
			translate([spine_height,i+tooth_width/2,0]) tooth(height,tooth_width,tooth_width*clip_percent,ratchet_percent);
		}
		square([spine_height,length]);
	}
}

module incramental(clip_percent=10,ratchet_percent=100,screw_head_dia=6,screw_dia=3.5,tpi=16,tooth_height=0,spine_height=0,length=6,width=1/2,screw_inset=1/2,screw_spacing=1,num_screws=0,use_screws=1){
	clip_percent=clip_percent/100;
	ratchet_percent=ratchet_percent/100;
	tooth_height=tooth_height<=0?1/tpi:tooth_height;
	tooth_heightmm=in2mm(tooth_height);
	spine_height=spine_height<=0?tooth_height:spine_height;
	spine_heightmm=in2mm(spine_height);
	lengthmm=in2mm(length);
	widthmm=in2mm(width);
	screw_inset=screw_inset<=0?0.001:in2mm(screw_inset);
	screw_spacing=num_screws>0?(lengthmm-screw_inset*2)/(num_screws-1):in2mm(screw_spacing);
	num_screws=num_screws<=0?(lengthmm-screw_inset*2)/screw_spacing:num_screws;
	difference(){
		teeth(spine_height,tpi,tooth_height,length,width,clip_percent,ratchet_percent);
		if(use_screws) for(i=[screw_inset:screw_spacing:lengthmm-screw_inset]){
			translate([i,widthmm/2,0]) screwHole(screw_dia,screw_head_dia,spine_heightmm,tooth_heightmm);
		}
	}
}

incramental(clip_percent,ratchet_percent,screw_head_dia,screw_dia,tpi,tooth_height,spine_height,length,width,screw_inset,screw_spacing,num_screws,use_screws);
```


[User]
Hi, I'm looking to design a parametric spool holder for 3D printer filament. I have a general idea of how I want it to look, based on some existing designs, but I need help generating the OpenSCAD files.

Essentially, it needs to hold a spool of filament using skateboard bearings and should be adaptable to different spool widths and diameters. I'm thinking of a design where the bearings are held in place by washers, as this keeps them secure but avoids direct contact with the main body of the holder, reducing friction. There should be a main frame that supports the bearings, and that needs to also be parametric in terms of the overall size and for different thicknesses.

The main design considerations are:

*   **Parametric Spool Dimensions:** I need to be able to specify the spool's width and outer diameter. There will be a flange width on the sides of the spool that I also need to specify.
*   **Bearing Support:** The design must accommodate standard skateboard bearings (8mm inner diameter, 22mm outer diameter). I need to use additional washers for a specific purpose. I need to specify the thickness of the washers and I need to include at least two washers on each side of the bearing. I also need to add an additional washer that holds the spool in place. The outer diameter of these support washers needs to be parameterized as well.
*   **Frame Structure:** The holder needs to be stable and I plan to use a box-like frame around the bearings to achieve that. The frame should be thick enough for stability but not overly bulky, and again this thickness needs to be parameterized. I'd like some kind of base below the washer supporting the spool, this will also need to be parameterized, and the frame needs to have 4 support columns, connecting the sides and top/bottom of the box.
*  **Clearance:** A little bit of extra tolerance should be included in the design.

So, I'd like to have all these dimensions controlled by variables in the OpenSCAD code: `reelWidth`, `reelOuter`, `flangeWidth`, `bearingSeparation`, `groundClearanceBelowOuterWasher` `boxThickness`, `tolerance`, `bearingWidth` ,`bearingInner`, `bearingOuter`, and `supportingWasherOuter`.

I'm thinking I'll need modules for the reel, the bearings, the washers, and the overall bearing/washer assembly. I also need a module to generate 4 of the bearing/washer assemblies that support the spool. Finally, I'll need a module for the outer frame that all of these sub modules are designed to fit into. I'd like to see the reel during the design process so I can ensure the overall model will work. I'll need to use the `difference()` operation to cut out the holes in the box.

I'm not sure what libraries might be helpful for this - but if you can suggest any, please do.

Could you help me generate this design?

[Assistant]
SpoolHolder_v2.scad:
```
// goals
//  hold spool in place on the bearings
//  use minimum plastic necessary for strength and stability
//    doesn't achieve this, but consideration given to easy printing
//
// inspiration
//  http://www.thingiverse.com/thing:283656
//  http://www.thingiverse.com/thing:971275

// bearing holding idea seen on
//  http://micro3dfans.com/download/file.php?id=100&t=1&sid=dd6a0187c45290eb48d930511e0b8567
//  appears to simply be a larger washer holding things in place

// concerns
//  large frame on M3D likely to peel away unless I can get Cura to lay down a 0.1 mm base layer for great adhesion

// must have
//  funtional

// nice to have
//  elegant

// variables
reelWidth = 55; // ideally everything should be driven from this single value
reelOuter = 200; // used for positioning
bearingSeparation = 55; // this is up for tweaking
flangeWidth = 5;

groundClearanceBelowOuterWasher = 2; // tweaking

boxThickness = 4;

// ; printer specific
tolerance = .4;

module reel () {
    rotate([0,90,0])
    difference() {
        cylinder (h=reelWidth, d=reelOuter,center=true);
        difference() {
            cylinder (h=reelWidth-flangeWidth*2, d=reelOuter+1,center=true);
            cylinder (h=reelWidth-flangeWidth*2+1, d=reelOuter-10,center=true);
        }
    }
}

module bearing () {
    rotate([0,90,0])
    difference() {
        cylinder (h=bearingWidth,d=bearingOuter,center=true);
        cylinder (h=bearingWidth+1,d=bearingInner,center=true);
    }
}

module washer(height,inner,outer) {
    rotate([0,90,0])
    difference() {
        cylinder (h=height,d=outer,center=true);
        cylinder (h=height+1,d=inner,center=true);
    }

}

module bearingAndWashers () {
    bearing();
    translate([-(bearingWidth/2+1),0,0])
    washer(2,8,12);
    translate([-(bearingWidth/2+1+2),0,0])
    washer(2,8,supportingWasherOuter);
    translate([-(bearingWidth/2+1-0.25),0,0])
    washer(2.5,supportingWasherOuter-2,supportingWasherOuter);
    translate([(bearingWidth/2+1),0,0])
    washer(2,8,12);
}

module produceBearingsAndWasherGroups() {
    translate([reelWidth/2-bearingWidth/2+1,bearingSeparation/2,supportingWasherOuter/2+groundClearanceBelowOuterWasher])
    rotate([0,0,180])
    bearingAndWashers();
    translate([-(reelWidth/2-bearingWidth/2+1),bearingSeparation/2,supportingWasherOuter/2+groundClearanceBelowOuterWasher])
    bearingAndWashers();
    translate([-(reelWidth/2-bearingWidth/2+1),-bearingSeparation/2,supportingWasherOuter/2+groundClearanceBelowOuterWasher])
    bearingAndWashers();
    translate([(reelWidth/2-bearingWidth/2+1),-bearingSeparation/2,supportingWasherOuter/2+groundClearanceBelowOuterWasher])
        rotate([0,0,180])
        bearingAndWashers();
}
$fn = 100;

bearingWidth = 7;
bearingInner = 8;
bearingOuter = 22;
supportingWasherOuter = bearingOuter+5; // also up for tweaking

%translate([0,0,sqrt(pow(reelOuter/2+bearingOuter/2,2)-pow(bearingSeparation/2,2))+supportingWasherOuter/2+groundClearanceBelowOuterWasher])
%reel();
%produceBearingsAndWasherGroups();

/*
%translate([-reelOuter/4-reelWidth/2-(bearingWidth/2+2),-bearingSeparation/2,supportingWasherOuter/2+groundClearanceBelowOuterWasher])
rotate([90,0,0])
difference() {
    cylinder(d=reelOuter/2, h=supportingWasherOuter, center=true);
    cylinder(d=reelOuter/2-8, h=supportingWasherOuter+1, center=true);
}
*/
difference() {
    union() {
        translate([0,0,(bearingOuter+groundClearanceBelowOuterWasher)/2])
        difference() {
            cube([reelWidth+bearingWidth/2-1.5+8+boxThickness*2,bearingSeparation+supportingWasherOuter+2+boxThickness*2,bearingOuter+groundClearanceBelowOuterWasher],center=true);
            cube([reelWidth+bearingWidth/2-1.5+8+tolerance,bearingSeparation+supportingWasherOuter+tolerance+2,bearingOuter+groundClearanceBelowOuterWasher+1],center=true);
        }
        translate([(reelWidth/2-2-flangeWidth-(boxThickness/2+1)-tolerance/2),-(bearingSeparation/2+2+1),(bearingOuter+groundClearanceBelowOuterWasher)/2])
        cube([boxThickness,bearingOuter+groundClearanceBelowOuterWasher,bearingOuter+groundClearanceBelowOuterWasher],center=true);
        translate([-(reelWidth/2-2-flangeWidth-(boxThickness/2+1)-tolerance/2),-(bearingSeparation/2+2+1),(bearingOuter+groundClearanceBelowOuterWasher)/2])
        cube([boxThickness,bearingOuter+groundClearanceBelowOuterWasher,bearingOuter+groundClearanceBelowOuterWasher],center=true);
        translate([-(reelWidth/2-2-flangeWidth-(boxThickness/2+1)-tolerance/2),(bearingSeparation/2+2+1),(bearingOuter+groundClearanceBelowOuterWasher)/2])
        cube([boxThickness,bearingOuter+groundClearanceBelowOuterWasher,bearingOuter+groundClearanceBelowOuterWasher],center=true);
        translate([(reelWidth/2-2-flangeWidth-(boxThickness/2+1)-tolerance/2),(bearingSeparation/2+2+1),(bearingOuter+groundClearanceBelowOuterWasher)/2])
        cube([boxThickness,bearingOuter+groundClearanceBelowOuterWasher,bearingOuter+groundClearanceBelowOuterWasher],center=true);
    };
    translate([-(reelWidth/2-bearingWidth/2+1),-bearingSeparation/2,supportingWasherOuter/2+groundClearanceBelowOuterWasher])
    rotate([0,90,0])
    cylinder(d=8,h=bearingWidth+boxThickness*2+6+4,center=true);
    translate([-(reelWidth/2-bearingWidth/2+1),bearingSeparation/2,supportingWasherOuter/2+groundClearanceBelowOuterWasher])
    rotate([0,90,0])
    cylinder(d=8,h=bearingWidth+boxThickness*2+6+4,center=true);
    translate([(reelWidth/2-bearingWidth/2+1),bearingSeparation/2,supportingWasherOuter/2+groundClearanceBelowOuterWasher])
    rotate([0,90,0])
    cylinder(d=8,h=bearingWidth+boxThickness*2+6+4,center=true);
    translate([(reelWidth/2-bearingWidth/2+1),-bearingSeparation/2,supportingWasherOuter/2+groundClearanceBelowOuterWasher])
    rotate([0,90,0])
    cylinder(d=8,h=bearingWidth+boxThickness*2+6+4,center=true);
}
```


[User]
Hey, I'm looking to generate some abstract art pieces using OpenSCAD, and I want to be able to easily adjust the parameters to create different looks. I was thinking of using `linear_extrude`, and I need a parametric design for this.

Specifically, I'd like to be able to control:

*   **Height:** The total height of the extruded shape.
*   **Twist:** The total twist angle in degrees across the height.
*   **Scale:** A scaling factor that changes from the base to the top of the extrusion. It should be a single number.
*   **Slices:** The number of linear extrude slices
*   **Width:** The width of the base shape.
*   **Length:** The length of the base shape. The base is always a rectangle.

I'd like to have all of these parameters adjustable in the code so I can tweak them and get various outputs.  I'd also like a top-level module, say named `abstract_art` that takes these parameters, so the code looks nice and readable.

Could you generate the OpenSCAD code for me? I don't need any extra libraries, just the basic OpenSCAD functionality is fine.

[Assistant]
AbstractArtMaker.scad:
```
//Abstact Art Maker

Height = 40;

Twist = 360;

Scale = 0;

Slices = 10;

//Base Width
Width = 20;

//Base Length
Length = 10;

linear_extrude(height = Height, twist = Twist, scale = Scale,  slices = Slices)
            square([Width, Length]);
```