[User]
Hi, I'm looking to design a configurable box using OpenSCAD. My granddaughter has a bunch of small looms, and I want to make a box with compartments to keep them organized. The box itself needs to fit inside another box where she can staple them.

I need a design that lets me specify the overall width, length, and height of the box. I also need to control the number of compartments along the width and length directions, as well as the thickness of the outer walls and inner dividing walls. Basically, I need parameters for:

*   **Total width:** The total width of the outer box.
*   **Total length:** The total length of the outer box.
*   **Overall height:** The total height of the box.
*   **Number of boxes/compartments in the width direction:** How many divisions along the width?
*   **Number of boxes/compartments in the length direction:** How many divisions along the length?
*   **Outer wall width:** The thickness of the outer wall of the box.
*   **Inner wall width:** The thickness of the walls separating the compartments.

The box should be a simple rectangular prism with the specified outer dimensions, and the compartments should be created by dividing it with the inner walls. The inner compartments should be empty.

I’d like to use OpenSCAD to generate the model. I don’t need any fancy features, just a solid, parametric design. No need for libraries for this either I believe.

Could you create the OpenSCAD code for me?

[Assistant]
SortingBox.scad:
```
/////////////////Parameters
/* [Sizes] */
// total width
tw =192; // [20:250]
// total length
tl = 154; // [20:250]
// height
owh = 40; // [10:100]
// boxes in width direction
nw=4; // [1:10]
// boxes in length direction
nl=3; // [1:10]
// outer wall width
oww = 1; // [0:3]
// inner wall width
iww = 0.6; // [0:3]
/* [Hidden] */

//drawing

boxes(nw,nl,oww,iww,owh,(tw-2*oww+iww)/nw,(tl-2*oww+iww)/nl);

//////////////////Calculations + modules

module boxes(nbw,nbl,ow,iw,oh,boxw,boxl) {
	difference() {
		cube([nbw*boxw+ow+ow-iw,nbl*boxl+ow+ow-iw,oh]);
		for (i=[0:nbw-1])
			for (j=[0:nbl-1])
				translate([i*boxw+ow,j*boxl+ow,ow])
					#cube([boxw-iw,boxl-iw,oh]);
	}
}

```


[User]
Hi! I'm looking to design a customizable sorting box for my granddaughter's loom tools, and I'd love your help creating the OpenSCAD files. The box should have multiple compartments arranged in a grid pattern. Here are the basic parameters I'd like to be able to adjust:

*   **`tw` (total width):** The overall width of the box.
*   **`tl` (total length):** The overall length of the box.
*   **`owh` (outer wall height):** The height of the box walls.
*   **`nw` (number of boxes in width direction):** The number of compartments across the width.
*   **`nl` (number of boxes in length direction):** The number of compartments along the length.
*   **`oww` (outer wall width):** The thickness of the outer walls.
*   **`iww` (inner wall width):** The thickness of the walls between the compartments.

I'd like the design to be such that the compartments fill the available space within the outer walls, and the inner walls are offset from the outer walls such that the inner walls do not merge with the outer walls when `oww` and `iww` are set to different thicknesses.

Could you generate the OpenSCAD code for this?

[Assistant]
SortingBox.scad:
```
/////////////////Parameters
/* [Sizes] */
// total width
tw =192;
// total length
tl = 154;
// height
owh = 40;
// boxes in width direction
nw=4; // [1:10]
// boxes in length direction
nl=3; // [1:10]
// outer wall width
oww = 1;
// inner wall width
iww = 0.6;
/* [Hidden] */

//drawing

boxes(nw,nl,oww,iww,owh,(tw-2*oww+iww)/nw,(tl-2*oww+iww)/nl);

//////////////////Calculations + modules

module boxes(nbw,nbl,ow,iw,oh,boxw,boxl) {
	difference() {
		cube([nbw*boxw+ow+ow-iw,nbl*boxl+ow+ow-iw,oh]);
		for (i=[0:nbw-1])
			for (j=[0:nbl-1])
				translate([i*boxw+ow,j*boxl+ow,ow])
					#cube([boxw-iw,boxl-iw,oh]);
	}
}

```


[User]
I'd like to create a configurable box, or really a set of boxes inside a larger box, that I can use for storing small items. I want to be able to control the overall size of the container, as well as how many individual boxes are inside. It's important that the inner boxes have rounded edges.

Specifically, I need parameters for:

*   **Total Width:** The overall width of the entire container.
*   **Total Length:** The overall length of the entire container.
*   **Height:** The height of the container.
*   **Number of Boxes Width:** How many inner boxes there are in the width direction.
*   **Number of Boxes Length:** How many inner boxes there are in the length direction.
*   **Outer Wall Width:** The thickness of the outside walls.
*   **Inner Wall Width:** The thickness of the walls of the inner boxes.
*   **Edge Radius:** The radius for rounding the edges of all corners (both inner and outer). If this is set to 0, there should be no rounding.

The design should have one outer container and then inner boxes arranged as a grid.

Could you generate the OpenSCAD code for this? I don't have any libraries, so please avoid using any (e.g. MCAD, BOSL, BOSL2, etc.).

[Assistant]
SortingBoxRoundEdges.scad:
```
/////////////////Parameters
/* [Sizes] */
// total width
tw =102;
// total length
tl = 104;
// height
owh = 40;
// boxes in width direction
nw=3; // [1:10]
// boxes in length direction
nl=3; // [1:10]
// outer wall width
oww = 1;
// inner wall width
iww = 0.6;
// edge radius
r = 0.9;
/* [Hidden] */
$fn=12;
//drawing

if (r<=0) {
	boxes(nw,nl,oww,iww,owh,(tw-2*oww+iww)/nw,(tl-2*oww+iww)/nl);
} else {
	rboxes(nw,nl,oww,iww,owh,(tw-2*oww+iww)/nw,(tl-2*oww+iww)/nl,r);
}

//////////////////Calculations + modules

module boxes(nbw,nbl,ow,iw,oh,boxw,boxl) {
	difference() {
		cube([nbw*boxw+ow+ow-iw,nbl*boxl+ow+ow-iw,oh]);
		for (i=[0:nbw-1])
			for (j=[0:nbl-1])
				translate([i*boxw+ow,j*boxl+ow,ow])
					cube([boxw-iw,boxl-iw,oh]);
	}
}

module rboxes(nbw,nbl,ow,iw,oh,boxw,boxl,r) {
	difference() {
		rcube(nbw*boxw+ow+ow-iw,nbl*boxl+ow+ow-iw,oh,r);
		for (i=[0:nbw-1])
			for (j=[0:nbl-1])
				translate([i*boxw+ow,j*boxl+ow,ow])
					rcube(boxw-iw,boxl-iw,oh,r);
	}
}

module rcube(w,l,h,r) {
	minkowski(){
		cube([w-2*r,l-2*r,h-2*r]);
		sphere(r);
	}
}
```


[User]
Hey, I'm looking to design a card holder for a board game called Firefly. It needs to be able to hold a deck of standard poker-sized cards, plus a discard pile. I'd like to be able to choose whether to print just the base, just the top, or both parts, and also how many holders I want in a single print.

Here are the specifics:

*   **Card Dimensions:** Standard poker size, so 64mm wide and 88mm long.
*   **Holder Height:** The holder should be about 25mm high, which will be roughly the height of a deck of cards. This might be adjustable later.
*   **Top/Base Option:** I need to be able to print just the base, just the top, or both parts together. The top should sit offset from the base, allowing cards to sit either on the base for the main deck, or on top if that's how it's designed, or both. I'm thinking I'll use the base to hold the deck, and the top for the discard pile, or the reverse, for various decks in the game.
*   **Offset:** The top should be offset backward by 14mm from the base.
*   **Overhang:** The cards should overhang the ends of the holder by 16mm.
*   **Angle:** The angled supports for the cards should have an 8-degree angle.
*   **Card Gap:** Add a 5mm gap to the card width to give some room for the cards.
*   **Bar Thickness:** The support bars should be 2mm thick.
*   **Clipping Gap:** There needs to be a small gap of 0.25mm for the top and bottom parts to clip together and for the clips between multiple bases.
*   **Both Part Gap:** If printing both the base and top together, add a 10mm gap between them.
*   **Multiple Holders:** I want to be able to print multiple holders in a single print job, so that might mean multiple bases on one print, or a set of bases and tops spaced appropriately.

I'd like to be able to parameterize all of these values. I think that's it.

For this, you'll need to use OpenSCAD, and I'd like to keep the design reasonably basic without needing any external libraries. Could you generate the necessary `.scad` file(s)?

[Assistant]
deckholder.scad:
```
/* [Main] */

// What would you like to generate?
part = "both"; // [base:Base Only,top:Top Only,both:Base and Top]

// Number of holders
holder_count = 1;

// Width of cards to be used (mm)
card_width = 64;

// Length of cards to be used (mm)
card_length = 88;

// Height of holder (approx height of deck) (mm)
holder_height = 25;	// Height of holder

/* [Tweaking] */

// How far back the top layer should be (mm)
top_offset = 14;
// How much the cards overhang the ends of the holder (mm)
overhang = 16;
// The angle of the angled supports (degrees)
angle = 8;
// Gap added to card with to give width of holder (mm)
card_gap = 5;
// Thickness of support bars (mm)
bar_thickness = 2;
// Gap to allow top/bottom to clip together (mm)
support_gap = 0.25;
// Gap to allow clips to clip together (mm)
clip_card_gap = 0.25;
// Distance between top and bottom if printing both (mm)
both_gap = 10;

/****************************************
 *
 ****************************************/

// Internal width of holder
holder_width = card_width + card_gap;
// Length of angled support
angled_length = cos(angle) * (card_length - overhang);;
// Height of angled support
angled_height = (tan(angle) * angled_length) + bar_thickness;
// Length of base (for side bars)
base_length = angled_length - top_offset;
// Full length of base
base_full_length = angled_length + bar_thickness;
// Full length of top
top_full_length = angled_length + (bar_thickness * 2);
// Thickness of clips
clip_thickness = bar_thickness * 1.5;
// Offset of angled support from middle (1/6th from 1/2 = 1/3rd!)
offset = (holder_width) / 6;
// Offset for diagonal bars
diag_offset = sin(45) * bar_thickness;

print_part();

/****************************************
 * Generate the selected part
 ****************************************/
module print_part()
{
	if (part == "base")
	{
		bases();
	} else if (part == "top") {
		tops();
	} else if (part == "both") {
		// translate stuff here...
		translate([0, (base_full_length + both_gap) / 2, 0])
			bases();
		translate([0, -(top_full_length + both_gap) / 2, 0])
			tops();
	}
}

/****************************************
 * Generate the correct number of tops
 ****************************************/
module tops()
{
	// Calculate the full width of the tops
	full_width = (holder_width + bar_thickness) * (holder_count) + (bar_thickness * 3);
	// Centre the tops around zero
	translate([full_width/2, -top_full_length/2, 0])
	{
		// Draw each top
		for(i=[1:holder_count])
		{
			translate([-(holder_width + bar_thickness) * (i-1),0,0])
				singleTop();
		}

		// Thicker bars at ends
		translate([-bar_thickness, angled_length, 0])
		{
			cube([bar_thickness, bar_thickness, holder_height + angled_height]);
		}
		translate([-full_width, angled_length, 0])
		{
			cube([bar_thickness, bar_thickness, holder_height + angled_height]);
		}
	}
}

/****************************************
 * Generate a single top holder
 ****************************************/
module singleTop()
{
	// Length of diagonal bar
	diag_length =
		(
			(offset*2 - bar_thickness)	// Distance between middle of angled support
												// 	and inside edge of side bar
			+ (diag_offset/2) 				// Distance from inside edge of side bar
												//		to rotation axis of diagional bar
			+ (bar_thickness-diag_offset)	// Distance from rotation axis
												//		to centre of diagonal bar
		) / sin(45);

	// Move the holder to start at [0,0,0]
	translate([-holder_width/2-(bar_thickness*2),0,0])
	{
		// As the base is mirrored down the middle, do a side at a time
		for (m=[[0,0,0],[1,0,0]])
		{
			mirror(m)
			{
				// Bar at back
				cube([offset, bar_thickness * 2, bar_thickness]);

				// Support at back
				translate([offset-(bar_thickness * 1.5),0,0])
					cube([bar_thickness * 3, bar_thickness, holder_height + bar_thickness]);
				translate([0,0,holder_height])
					cube([offset, bar_thickness, bar_thickness]);

				// Angled Support
				translate([offset-(bar_thickness * 0.5),bar_thickness,0])
					angledSupport();

				// Notches
				translate([offset-(bar_thickness * 1.5), 0, 0])
				{
					for(s=[
								[0, top_offset - bar_thickness, 0],
								[0, top_offset + bar_thickness + support_gap, 0]
							])
					{
						translate(s)
							cube([bar_thickness * 3, bar_thickness - support_gap, bar_thickness]);
					}
				}

				// Bar at front
				translate([0, angled_length, 0])
					cube([holder_width/2 + (bar_thickness * 2), bar_thickness, bar_thickness * 2]);

				// Front support
				translate([holder_width/2 - bar_thickness, angled_length - bar_thickness, 0])
				{
					for(t=[
							[0, 0, 0],
							[bar_thickness*2 + support_gap, 0, 0]
						])
					{
						translate(t)
							cube([bar_thickness - support_gap, bar_thickness * 3, bar_thickness * 2]);
					}

					translate([0, 0, bar_thickness * 1.5])
						cube([bar_thickness * 3, bar_thickness * 3, bar_thickness * 0.5]);

					// Vertical support
					translate([bar_thickness,0,bar_thickness * 1.5])
					{
						cube([bar_thickness,
								bar_thickness * 3,
								holder_height + angled_height - (bar_thickness * 1.5)]);
					}
				}

				// Diagonal supports
				translate([holder_width/2, angled_length + bar_thickness - diag_offset, 0])
					rotate([0,0,135])
						cube([bar_thickness,diag_length,bar_thickness]);
			}
		}
	}
}

/****************************************
 * Generate the correct number of bases
 ****************************************/
module bases()
{
	// Move bases so generated object is in middle of area
	translate([
			((holder_width * holder_count) + (bar_thickness * (holder_count + 1)))/2,
			-base_full_length/2,
			0])
	{
		// Draw each base
		for(i=[1:holder_count])
		{
			translate([-(holder_width + bar_thickness) * (i-1),0,0])
				singleBase();
		}

		// Add the clips - all mirrored/rotated in their own way

		clip();

		translate([0,base_length + (bar_thickness * 2),0])
			mirror([0,1,0])
				clip();

		translate([-(holder_width + bar_thickness) * (holder_count) - bar_thickness,
						base_length + (bar_thickness * 2) - (clip_thickness * 3),
						0])
			mirror([1,0,0])
				clip();

		translate([-(holder_width + bar_thickness) * (holder_count) - bar_thickness,
						(clip_thickness * 3),
						0])
			rotate([0,0,180])
				clip();

	}
}

/****************************************
 * Generate a single base
 ****************************************/
module singleBase()
{
	// Length of diagonal bar
	diag_length =
		(
			(offset*2) 						// Distance between middle of angled support
												// 	and inside edge of side bar
			+ (diag_offset/2) 				// Distance from inside edge of side bar
												//		to rotation axis of diagional bar
			+ (bar_thickness-diag_offset)	// Distance from rotation axis
												//		to centre of diagonal bar
		) / sin(45);

	// Move so the base is at [0,0,0]
	translate([-holder_width/2-bar_thickness,0,0])
	{
		// As the base is mirrored down the middle, do a side at a time
		for (m=[[0,0,0],[1,0,0]])
		{
			mirror(m)
			{
				// Bar at back
				cube([holder_width/2, bar_thickness, bar_thickness * 2]);
				// Bar at front
				translate([0,base_length,0])
					cube([holder_width/2, bar_thickness, bar_thickness]);
				// Bar at top of back support
				translate([0,0,holder_height + angled_height - bar_thickness])
					cube([offset, bar_thickness, bar_thickness]);

				// Side bar
				translate([holder_width/2,0,0])
					cube([bar_thickness, base_length + bar_thickness, bar_thickness * 2]);

				// angled Support
				translate([offset-(bar_thickness * 0.5),bar_thickness,0])
					angledSupport();

				// Back support
				translate([offset-(bar_thickness * 1.5),0,0])
					verticalSupport();
				// Front support
				translate([holder_width/2 + bar_thickness,base_length - bar_thickness,0])
					rotate([0,0,90])
						verticalSupport();

				// Diagonal at back
				translate([holder_width/2 + (bar_thickness - diag_offset), 0, 0])
					rotate([0,0,45])
						cube([bar_thickness,diag_length,bar_thickness]);
				// Diagonal at front
				translate([holder_width/2 + bar_thickness, base_length + bar_thickness - diag_offset, 0])
					rotate([0,0,135])
						cube([bar_thickness,diag_length,bar_thickness]);
			}
		}
	}
}

/****************************************
 * Angled support for cards to sit on
 ****************************************/
module angledSupport()
{
	// Calculate the maximum height of holes
	max_hole = floor(
		((angled_length - (bar_thickness * 2)) * tan(angle))
		- bar_thickness);

	difference()
	{
		// The triangle, with a bar of bar_thickness underneath
		polyhedron(points=[
			[0,0,0], [bar_thickness,0,0],
			[0,angled_length,0], [bar_thickness,angled_length,0],
			[0,angled_length,angled_height], [bar_thickness,angled_length,angled_height],
			[0,0,bar_thickness], [bar_thickness,0,bar_thickness] ],
			// ONLY STILL TRIANGLES FOR THINGIVERSE CUSTOMIZER!
			triangles=[
				[0,1,2], [1,3,2],
				[2,3,5], [2,5,4],
				[4,5,6], [5,7,6],
				[0,6,1], [6,7,1],
				[0,2,6], [2,4,6],
				[3,1,7], [5,3,7]
		]);

		// Step through heights of holes and add them
		if(max_hole>0)
		{
			for (v=[bar_thickness+1:bar_thickness+max_hole])
			{
				translate([-0.1, v/tan(angle), bar_thickness])
					cube([bar_thickness + 0.2,
							min((v+1)/tan(angle), angled_length)
								-(v/tan(angle))
								-bar_thickness,
							(v-bar_thickness)]);
			}
		}
	}
}

/****************************************
 * A single vertical support for the base (with notches on the top)
 ****************************************/
module verticalSupport()
{
	difference() {
		cube([bar_thickness*3,bar_thickness,holder_height + angled_height + bar_thickness]);
		translate([bar_thickness-support_gap,0,holder_height + angled_height]) {
			cube([bar_thickness+(support_gap * 2),bar_thickness,bar_thickness * 1.1]);
		}
	}
}

/****************************************
 * A single clip, to clip multiple bases together
 ****************************************/
module clip()
{
	translate([-bar_thickness,0,0])
		cube([clip_thickness * 2 + bar_thickness, clip_thickness, bar_thickness * 2]);
	translate([clip_thickness + clip_card_gap, clip_thickness, 0])
		cube([clip_thickness - clip_card_gap, clip_thickness - clip_card_gap, bar_thickness * 2]);
}

```


[User]
I'm looking to create a customizable cable spool organizer in OpenSCAD, similar to the one I saw on Thingiverse, but I want it to be fully parametric. I'd like to be able to adjust several key dimensions to fit different cable sizes.

The design should consist of two main parts: a top and a bottom, both being mostly circular. The top part should have a raised central cylinder, which, along with the bottom part, provides the spooling area for the cable. Both parts should have an outer flange, and cutouts along the flange to reduce the amount of material.

Here are the parameters I would like to control:

*   `big_radius`: The radius of the outer flange (both top and bottom).
*   `flange_thick`: The thickness of the outer flange (both top and bottom).
*   `cut_radius`: The radius of the circular cutouts on the outer flange. I want six of them, equally spaced around the circumference.
*   `small_radius`: The radius of the central cylinder on the top part. The bottom part's cylinder should be slightly smaller, to create a snug fit when the two parts are assembled.
*   `winding_thick`: The thickness of the winding area, which is basically the height of the central cylinders.

Additionally, the top part should have a locking slot and the bottom part should have corresponding locking tabs, to hold the two parts together when assembled.  The locking slot should be located in the top part's central cylinder, and the locking tabs should be located in the bottom part's cylinder.  Please make the locking slot/tabs a simple rectangular shape, rather than more complex shapes. The locking slot and tabs should have a width of 3mm, and they should have a length that extends slightly beyond the center cylinder. I'm picturing that the thickness of the slot/tabs will be the same as `winding_thick` minus 2 * `flange_thick`.

I'd like the final output to be controlled by a `part` variable, with options for rendering the "top", "bottom", or "both" parts, similar to the example.

I think that covers everything. Can you generate the OpenSCAD code for this?

[Assistant]
Cable_spool_organizer.scad:
```
/*
Made by Ben Wittbrodt (http://www.thingiverse.com/BenWittbrodt/)
Customizeable version of: http://www.thingiverse.com/thing:427024 by cheewee2000)
*/

/*[Customizer Variables]*/

//Which part would you like to render?
part			=	"both"; //[top:Top, bottom:Bottom, both:Both]
//Radius of the outer guard for the spooler
big_radius	=	40;	//[30:80]
//Thickness of the flange of the outer guard
flange_thick	=	2;	//[1:4]
//Radius of the circle cutouts on outer guard
cut_radius	=	8;	//[0:20]
//Radius of the middle cylindrical cutout
small_radius	=	15;	//[5:30]
//Thickness of the winding area (where the cord will be)
winding_thick	=	20;	//[5:50]

/*[hidden]*/
$fn=100;

output();

module output()
{
	if (part == "top") {
		top();
	} else if (part == "bottom") {
		bottom();
	} else if (part == "both") {
		top();
		translate([big_radius*2+5,0,0])
		bottom();
	}
}

module top()
{
	difference()
	{
		union()
		{
			cylinder(r=big_radius, h=flange_thick); //Outer flange

			cylinder(r=small_radius+flange_thick, h=flange_thick+winding_thick);	//Inner cylinder
		}

		for (i=[1:6])
		{
			rotate([0,0,60*i])
			translate([big_radius/2+cut_radius,0,-.1])
				cylinder(r=cut_radius,h=flange_thick+.2); //Flange cutouts
		}

		translate([0,0,-.15])
			cylinder(r=small_radius, h=winding_thick+flange_thick*2+0.2);	//inner radius cutout

		translate([-small_radius-flange_thick,0,flange_thick*3])
			cube([small_radius*2+(2*flange_thick),3,winding_thick]);		//locking slot
	}
}

module bottom()
{
	difference()
	{
		union()
		{
			cylinder(r=big_radius, h=flange_thick);	//Outer flange
			cylinder(r=small_radius-.2, h=flange_thick+winding_thick);	//Inner cylinder

			translate([-small_radius-flange_thick,0,flange_thick*2])
				cube([small_radius*2+(2*flange_thick),3,winding_thick-(flange_thick*2)]);  //locking tabs
		}

		for (i=[1:6])
		{
			rotate([0,0,60*i])
			translate([big_radius/2+cut_radius,0,-.1])
				cylinder(r=cut_radius,h=flange_thick+.2); //Flange cutouts
		}

		translate([0,0,-.15])
		cylinder(r=small_radius-flange_thick, h=winding_thick+flange_thick*2+0.2); //Inner cylinder cutout
	}
}
```


[User]
Hey, I'm looking to generate a bracket for 3D printing, and I'd like it to be parametric so I can easily adjust the dimensions later. I need it to have two main arms forming a right angle, connected by a diagonal brace. I'm thinking of it like two rounded box arms meeting, with a third cube brace.

Here are some of the specific parameters I need:

*   **`Sides_Length`**: This will control the length of the two main arms, and should be adjustable between say, 40 and 100 mm.
*   **`Width`**: This will be the width of all the arms of the bracket, and should be adjustable between 20 and 80 mm.
*  **`Thickness`**: This will be the thickness of all the arms and the brace, and adjustable between 3 and 20 mm
*   **`Hole_Radius`**:  I need circular holes on each arm as well as on the diagonal brace. They should be adjustable in radius, say between 1.5 and 10 mm. I need them in the correct locations for the design. The diameter of the four main holes should be twice the radius
*   **`Corner_Radius`**: The corners of the two main arms need to be rounded. This should be a variable that I can adjust between 0 and 10 mm.

Also, the design should have some additional cylindrical cutouts in the design as well as two small angled cubes to strengthen the corners.  I'm thinking the cutouts should be cylinder cutouts of twice the `Hole_Radius` diameter. I am thinking two additional cutouts on each side of the bracket plus 1 on the diagonal brace, and one cylinder that passes through the corner.
I'm looking for a design similar to the one described here.

I need all the code to be in OpenSCAD, and please make sure to use the `MCAD/boxes.scad` library for the rounded box functionality. Can you help me with this?

[Assistant]
Bracket.scad:
```
/*
Created by David Taylor as part of a video series
Video are available at http://bit.ly/GineerTube
*/

include <MCAD/boxes.scad>

//How long should the sides be?
Sides_Length=40;//[40:100]

//How wide should it be?
Width=20;//[20:80]

//How thick should it be?
Thickness=6;//[3:20]

//How big should the holes be?
Hole_Radius=3;//[1.5:10]

//What should the corner radius be?
Corner_Radius=2.5;//[0:10]

difference()
{
	union()
	{
		translate([(Sides_Length/2)-(Thickness/2),0,0])
		{
			//cube([Sides_Length,Width,Thickness], center=true);
			roundedBox([Sides_Length,Width,Thickness],Corner_Radius,true);
		}
		translate([0,0,(Sides_Length/2)-(Thickness/2)])
		{
			rotate([0,90,0])
			{
				//cube([Sides_Length,Width,Thickness], center=true);
				roundedBox([Sides_Length,Width,Thickness],Corner_Radius,true);
			}
		}
		translate([((Sides_Length/2)*sqrt(2))/2,0,((Sides_Length/2)*sqrt(2))/2])
		{
			rotate([0,45,0])
			{
				cube([Sides_Length,Width,Thickness], center=true);
			}
		}
		cube([Thickness,Width,Thickness],center=true);
	}
	translate([(Sides_Length/4),0,0])
	{
		cylinder(h=(Thickness*2), r=Hole_Radius, $fn=100, center=true);
	}
	translate([(Sides_Length/4)*3,0,0])
	{
		cylinder(h=(Thickness*2), r=Hole_Radius, $fn=100, center=true);
	}
	rotate([0,-90,0])
	{
		translate([(Sides_Length/4),0,0])
		{
			cylinder(h=(Thickness*2), r=Hole_Radius, $fn=100, center=true);
		}
		translate([(Sides_Length/4)*3,0,0])
		{
			cylinder(h=(Thickness*2), r=Hole_Radius, $fn=100, center=true);
		}
	}
	translate([(Sides_Length/4),0,(Sides_Length/2)+(Thickness/2)+0.1])
	{
		cylinder(h=(Sides_Length), r=(Hole_Radius*2), $fn=100, center=true);
	}
	translate([(Sides_Length/2)+(Thickness/2)+0.1,0,(Sides_Length/4)])
	{
		rotate([0,90,0])
		{
			cylinder(h=(Sides_Length), r=(Hole_Radius*2), $fn=100, center=true);
		}
	}
	translate([(Sides_Length/4)*3,0,(Sides_Length/2)+(Thickness/2)])
	{
		cylinder(h=(Sides_Length), r=(Hole_Radius*2), $fn=100, center=true);
	}
	translate([(Sides_Length/2)+(Thickness/2),0,(Sides_Length/4)*3])
	{
		rotate([0,90,0])
		{
			cylinder(h=(Sides_Length), r=(Hole_Radius*2), $fn=100, center=true);
		}
	}
	translate([(Sides_Length/4)+(Sides_Length/2),0,(Sides_Length/4)+(Sides_Length/2)])
	{
		cube([Sides_Length,(Hole_Radius*4),Sides_Length], center=true);
	}
	translate([(Sides_Length)-sqrt(pow(Sides_Length/8,2)-pow(Thickness/2,2)),0,(Thickness)])
	{
		rotate([0,20,0])
		{
			cube([(Sides_Length/4),Width,Thickness],center=true);
		}
	}
	translate([(Thickness),0,(Sides_Length)-sqrt(pow(Sides_Length/8,2)-pow(Thickness/2,2))])
	{
		rotate([0,-20,0])
		{
			cube([Thickness,Width,(Sides_Length/4)],center=true);
		}
	}
}
```


[User]
Hi, I'm looking to design a customizable selector valve for fluid, primarily for hydroponics. I'd like the design to be parametric in OpenSCAD, so I can easily adjust things. The valve should have the following features:

**General:**

*   A main "case" consisting of a top and bottom piece, and a rotating selector part inside.
*   The option to control the selector via a servo or a manual handle.
*   The ability to specify the number and size of inlets and outlets.
*   The ability to adjust the angles of the inlet and outlet pipes.
*   Optional barbs on the inlet and outlet pipes.
*   The ability to have an "off" position for the outlets (or just have the positions between the other outlets be 'off').
*   Screw holes for mounting the valve.
*   A way to adjust the case thickness, selector thickness and other fit parameters.

**Specific Parameters:**

*   **Case:**
    *   `case_thickness`: Thickness of the top and bottom case walls.
    *   `selector_margin`: Margin around the selector.
    *   `selector_fit`: Tolerance between the selector and case.
    *   `inner_cavity_height`: Height of the space inside the case.
    *   `selector_thickness`: Thickness of the selector disc.
*   **Inlets:**
    *   `num_inlets`: Number of inlets.
    *   `inlet_dia`: Diameter of the inlet pipes.
    *   `inlet_len`: Length of the inlet pipes.
    *   `inlet_angle`: Angle of the inlet pipes.
    *   `inlet_pipe_thickness`: Thickness of the inlet pipe walls.
    *   `inlet_pipe_num_barbs`: Number of barbs on the inlets.
    *   `inlet_pipe_barb_height`: Height of the inlet barbs.
    *   `inlet_pipe_barb_width`: Width of the inlet barbs.
*   **Outlets:**
    *   `num_outlets`: Number of outlets.
    *   `offPosition`: Boolean to include an "off" position.
    *   `outlet_dia`: Diameter of the outlet pipes.
    *   `outlet_len`: Length of the outlet pipes.
    *   `outlet_angle`: Angle of the outlet pipes.
    *   `outlet_pipe_thickness`: Thickness of the outlet pipe walls.
    *   `outlet_pipe_num_barbs`: Number of barbs on the outlets.
    *   `outlet_pipe_barb_height`: Height of the outlet barbs.
    *   `outlet_pipe_barb_width`: Width of the outlet barbs.
*  **Attachment:**
   *    `num_screws`: Number of mounting screws
   *    `screw_od`: Outer diameter of the screws
   *    `screw_pilot`: Diameter of the screw pilot holes.
   *    `screw_countersink`: Diameter of the countersink on the screws
*   **Handle (if manual control is chosen):**
    *   `handle_width`: Width of the handle.
    *  `handle_thickness`: Thickness of the handle.
    *   `handle_length`: Length of the handle.
    *   `handle_shaft_dia`: Diameter of the handle shaft.
    *   `handle_shaft_height`: Height of the handle shaft.
*   **Servo (if servo control is chosen):**
    *   `servo_hole_pilot`: Diameter of the servo screw pilot holes.
    *   `servo_hole_spaing`: Spacing between servo mounting holes.
    *   `spline_id`: Inner diameter of the servo spline.
    *   `spline_od`: Outer diameter of the servo spline.
    *   `num_splines`: Number of splines on the servo shaft.
    *   `spline_height`: Height of the servo spline.
     *  `spline_distance_to_screw_surface`: Distance from the spline to the top of the servo mount (for screw placement)
     *  `top_screws_distance_to_spline`: distance from the spline to the top screws on the servo
     *  `bottom_screws_distance_to_spline`: distance from the spline to the bottom screws on the servo

I don't need code for any external libraries but I'd like to use the following if they are useful: *MCAD*.

I think that should cover it. Let me know if you have any questions!

[Assistant]
servo_valve.scad:
```
/*
A printable selector valve for diverting fluid to different directions.

This was designed with aquaponics / hydroponics in mind but may have many other uses.
Its all customizable too, so there are lots of options, for example:
* Valve can be servo controlled, or manual.
* Any size + number of outlets you want, as well as multiple inlets so it can tee into the middle of a line.

This is a work-in-progress and has not been physically tested yet.  See the instructions tab for details.

This is licensed under Creative Commons - Attribution - Share alike.
For the Attribution requirement, you may simply reference:
	http://www.thingiverse.com/thing:436659

TODO:
	1) Improve maths to get diameter from number of selections and hole size
	2) Add o-rings (and std o-ring chooser?)
	3) Account for servo angle range (much less than 180, and what I have now would require 360)
	4) Is the off position even necessary?  In between any two selections is off!
Future improvements:
	1) gearing?
	2) Possibly make more printable somehow?
	3) A mounting bracket to affix it to something
	4) Spring-loaded?

*/

/* [main] */
control_via=0; // [0:servo (from the servo tab), 1:handle (from the handle tab)]
case_thickness=2;

exploded_view=true;
show_control=true;
show_top=true;
show_selector=true;
show_bottom=true;

/* [inlets] */
num_inlets=2; // Higher numbers are used to tee into lines (can be 0)
inlet_dia=10;
inlet_len=25;
inlet_angle=0; // Usually you'd want 0 (0=straight out .. 90=straight up)
inlet_pipe_thickness=1;
inlet_pipe_num_barbs=4; // Use 0 to turn off barbs
inlet_pipe_barb_height=1;
inlet_pipe_barb_width=3;

/* [outlets] */
num_outlets=3;
offPosition=true; // include an off position in addition to num_outlets
outlet_dia=7;
outlet_len=20;
outlet_angle=0; // Usually you'd want 0 (0=straight out .. 90=straight down)
outlet_pipe_thickness=0.5;
outlet_pipe_num_barbs=4; // Use 0 to turn off barbs
outlet_pipe_barb_height=0.5;
outlet_pipe_barb_width=2;

/* [attachment] */
num_screws=6; // can be 0
screw_od=2;
screw_pilot=1.5;
screw_countersink=5; // can be 0

/* [handle] */
handle_width=15;
handle_thickness=4;
handle_length=75;
handle_shaft_dia=7.5;
handle_shaft_height=10;

/* [servo] */
servo_hole_pilot=3;
servo_hole_spaing=10;
spline_id=4;
spline_od=5;
num_splines=50;
spline_height=4;
spline_distance_to_screw_surface=10;
top_screws_distance_to_spline=17;
bottom_screws_distance_to_spline=30;

/* [advanced] */
selector_margin=3;
selector_fit=0.3;
inner_cavity_height=5;
selector_thickness=3;

/* [hidden] */
pi=3.14159265358979323846264338327950288419716939937510582;
scoche=0.001;
halfscoche=scoche/2;

shaft_dia=control_via==0?spline_od+case_thickness:handle_shaft_dia;
shaft_length=spline_height-spline_height/10+case_thickness+inner_cavity_height;
total_selections=offPosition?num_outlets+1:num_outlets;
outlet_center_dia=shaft_dia+2*selector_margin+outlet_dia; // This may need to be adjusted for if we have more outlet diameters than circumference
selector_dia=outlet_center_dia+outlet_dia+2*selector_margin;
servo_rotation=180/num_screws;
handle_shaft_sides=4;

module case_bottom() {
	pipe_angle=90+outlet_angle;
	translate([0,0,-case_thickness]) difference() {
		union() {
			for(i=[0:num_outlets-1]){ // outlet pipes outside
				rotate([0,180,i*360/total_selections-servo_rotation]) translate([outlet_center_dia/2,0,outlet_dia/2]) rotate([0,90,0]) pipe_elbow(0,outlet_dia+outlet_pipe_thickness*2,0,outlet_len,false,true,pipe_angle,num_barbs=outlet_pipe_num_barbs,barb_height=outlet_pipe_barb_height,barb_width=outlet_pipe_barb_width); // the outside
			}
			cylinder(r=selector_dia/2+selector_fit+case_thickness,h=case_thickness+selector_thickness); // the outside of the case
			for(i=[0:num_screws-1]){
				rotate([0,0,i*360/num_screws]) translate([selector_dia/2+selector_fit+case_thickness+screw_od/2,0,0]) { // screw bodies
					cylinder(r=screw_od/2+case_thickness,h=case_thickness+selector_thickness,$fn=max($fn,12));
				}
			}
		}
		for(i=[0:num_screws-1]){
			rotate([0,0,i*360/num_screws]) translate([selector_dia/2+selector_fit+case_thickness+screw_od/2,0,0]) { // screw pilot holes
				translate([0,0,case_thickness]) cylinder(r=screw_pilot,h=case_thickness+selector_thickness,$fn=max($fn,12));
			}
		}
		for(i=[0:num_outlets-1]){ // outlet_pipes_inside
			rotate([0,180,i*360/total_selections-servo_rotation]) translate([outlet_center_dia/2,0,outlet_dia/2]) rotate([0,90,0]) pipe_elbow(outlet_dia,0,outlet_dia+case_thickness+scoche,outlet_len,true,false,pipe_angle); // the outside
		}
		translate([0,0,case_thickness]) cylinder(r=selector_dia/2+selector_fit,h=selector_thickness+scoche); // cut out the inside of the cup
	}
}

module selector() {
	if(control_via==0){
		difference() { // servo shaft
			cylinder(r=shaft_dia/2,h=shaft_length+selector_thickness,$fn=max($fn,16)); // servo shaft
			translate([0,0,shaft_length+selector_thickness-spline_height]) servo_spline();
		}
	}else{
		union(){
			translate([0,0,-halfscoche]) cylinder(r=handle_shaft_dia/2,h=handle_shaft_height+selector_thickness+handle_thickness,$fn=handle_shaft_sides);
			cylinder(r=handle_shaft_dia/2,h=handle_shaft_height+selector_thickness,$fn=max($fn,16)); // servo shaft
		}

	}
	difference() {
		cylinder(r=selector_dia/2,h=selector_thickness); // the selector
		translate([outlet_center_dia/2,0,-halfscoche]) cylinder(r2=inlet_dia/2,r1=outlet_dia/2,h=selector_thickness+scoche); // the hole
	}
}

module case_top(pipe_angle=90){
	countersink_height=screw_countersink>screw_od?(screw_countersink-screw_od)/2:0;
	pipe_angle=90+inlet_angle;
	translate([0,0,selector_thickness]) difference() {
		union() {
			for(i=[0:num_inlets-1]){
				rotate([0,0,i*360/num_inlets-servo_rotation]) translate([selector_dia/2-inlet_dia/2,0,inlet_dia/2]) rotate([0,90,0]) pipe_elbow(0,inlet_dia,0,inlet_len,false,true,pipe_angle,num_barbs=inlet_pipe_num_barbs,barb_height=inlet_pipe_barb_height,barb_width=inlet_pipe_barb_width); // the outside
			}
			if(control_via==0){
				servo_screw_posts(extra=case_thickness+inner_cavity_height);
			}
			cylinder(r=selector_dia/2+selector_fit+case_thickness,h=case_thickness+inner_cavity_height); // the outside of the case
			for(i=[0:num_screws-1]){ // screw bodies
				rotate([0,0,i*360/num_screws]) translate([selector_dia/2+selector_fit+case_thickness+screw_od/2,0,0]) {
					cylinder(r=screw_od/2+case_thickness,h=case_thickness+inner_cavity_height+countersink_height,$fn=max($fn,12));
				}
			}
		}
		for(i=[0:num_screws-1]){ // screw holes
			rotate([0,0,i*360/num_screws]) translate([selector_dia/2+selector_fit+case_thickness+screw_od/2,0,0]) {
				cylinder(r=screw_od,h=case_thickness+inner_cavity_height+scoche,$fn=max($fn,12));
				if(screw_countersink>screw_od) translate([0,0,inner_cavity_height+case_thickness]) cylinder(r2=screw_countersink,r1=screw_od,h=countersink_height,$fn=max($fn,12));
			}
		}
		for(i=[0:num_inlets-1]){
			rotate([0,0,i*360/num_inlets-servo_rotation]) translate([selector_dia/2-inlet_dia/2,0,inlet_dia/2]) rotate([0,90,0]) pipe_elbow(inlet_dia-inlet_pipe_thickness*2,0,0,inlet_len,true,false,pipe_angle); // the inside
		}
		translate([0,0,-scoche]) cylinder(r=selector_dia/2+selector_fit,h=case_thickness+scoche); // the inside cup
		translate([0,0,-halfscoche]) cylinder(r=shaft_dia/2+selector_fit,h=case_thickness+inner_cavity_height+scoche,$fn=max($fn,16)); // the shaft hole
	}
}

module servo_spline() {
	spline_tooth_radius=(spline_od/2-spline_id/2);
	spline_center_radius=(spline_od+spline_id)/4;
	circumference_per_spline=spline_id*pi/num_splines;
	spline_vertical_squish=(spline_tooth_radius/circumference_per_spline)*3/4;
	/*
	// alignment helpers
	difference(){
		cylinder(r=spline_od/2+0.1,h=spline_height,$fn=32);
		cylinder(r=spline_od/2,h=spline_height,$fn=32);
	}
	difference(){
		cylinder(r=spline_id/2,h=spline_height,$fn=32);
		cylinder(r=spline_id/2-0.1,h=spline_height,$fn=32);
	}*/
	cylinder(r=spline_id/2+0.01,h=spline_height,$fn=32);
	for(i=[0:num_splines-1]){
		rotate([0,0,i*360/num_splines]) translate([spline_center_radius-spline_tooth_radius/pi+0.1,0,0]) scale([1,0.5/spline_vertical_squish,1]) cylinder(r=spline_tooth_radius*3/4,h=spline_height,$fn=3);
	}
}

module handle() {
	fit=0.2;
	difference() {
		union() {
			translate([0,0,handle_shaft_height]) hull() {
				cylinder(r=handle_width/2,h=handle_thickness);
				translate([-handle_length,0,0]) cylinder(r=handle_width/2,h=handle_thickness);
			}
			cylinder(r=handle_shaft_dia/2+case_thickness,h=handle_shaft_height);
		}
		translate([0,0,-halfscoche]) cylinder(r=handle_shaft_dia/2+fit,h=handle_shaft_height+handle_thickness+scoche,handle_thickness+scoche,$fn=handle_shaft_sides);
	}
}

module servo() {
	screw_hole_od=servo_hole_pilot*3/2;
	screw_margin=2;
	screw_mount_x=top_screws_distance_to_spline+bottom_screws_distance_to_spline-screw_hole_od-screw_margin*2;
	screw_mount_y=servo_hole_spaing+screw_countersink-screw_od+screw_margin*2;
	screw_mount_z=screw_margin;
	body_x=screw_mount_x-(screw_hole_od+screw_margin)*2;
	body_y=screw_mount_y;
	body_z=body_x;
	//
	rotate([0,0,servo_rotation]) translate([top_screws_distance_to_spline/2-bottom_screws_distance_to_spline/2,0,0]) color([0.2,0.2,0.2]){
		translate([-body_x/2,-body_y/2,spline_height]) cube([body_x,body_y,body_z]);
		translate([0,0,spline_distance_to_screw_surface]) difference() {
			translate([-screw_mount_x/2,-screw_mount_y/2,0]) cube([screw_mount_x,screw_mount_y,screw_mount_z]);
			translate([-screw_mount_x/2+screw_hole_od/2+screw_margin,-screw_mount_y/2+screw_hole_od/2+screw_margin,-scoche]) cylinder(r=screw_hole_od/2,h=screw_mount_z+scoche);
			translate([-screw_mount_x/2+screw_hole_od/2+screw_margin, screw_mount_y/2-screw_hole_od/2-screw_margin,-scoche]) cylinder(r=screw_hole_od/2,h=screw_mount_z+scoche);
			translate([ screw_mount_x/2-screw_hole_od/2-screw_margin,-screw_mount_y/2+screw_hole_od/2+screw_margin,-scoche]) cylinder(r=screw_hole_od/2,h=screw_mount_z+scoche);
			translate([ screw_mount_x/2-screw_hole_od/2-screw_margin, screw_mount_y/2-screw_hole_od/2-screw_margin,-scoche]) cylinder(r=screw_hole_od/2,h=screw_mount_z+scoche);
		}
	}
	color([1,1,1]) servo_spline();
}

module servo_screw_posts(full_body=true,extra=0,$fn=16){
	screw_hole_od=servo_hole_pilot*3/2;
	screw_margin=2;
	screw_mount_x=top_screws_distance_to_spline+bottom_screws_distance_to_spline-screw_hole_od-screw_margin*2;
	screw_mount_y=servo_hole_spaing+screw_countersink-screw_od+screw_margin*2;
	screw_mount_z=screw_margin;
	body_x=screw_mount_x-(screw_hole_od+screw_margin)*2;
	body_y=screw_mount_y;
	body_z=body_x;
	//
	rotate([0,0,servo_rotation]) translate([top_screws_distance_to_spline/2-bottom_screws_distance_to_spline/2,0,0]) difference() {
		if(full_body) union(){
			hull() { // the stand-offs
				translate([-screw_mount_x/2+screw_hole_od/2+screw_margin,-screw_mount_y/2+screw_hole_od/2+screw_margin,-scoche]) cylinder(r=servo_hole_pilot/2+case_thickness/2,h=extra+spline_distance_to_screw_surface);
				translate([-screw_mount_x/2+screw_hole_od/2+screw_margin, screw_mount_y/2-screw_hole_od/2-screw_margin,-scoche]) cylinder(r=servo_hole_pilot/2+case_thickness/2,h=extra+spline_distance_to_screw_surface);
			}
			hull() {
				translate([ screw_mount_x/2-screw_hole_od/2-screw_margin,-screw_mount_y/2+screw_hole_od/2+screw_margin,-scoche]) cylinder(r=servo_hole_pilot/2+case_thickness/2,h=extra+spline_distance_to_screw_surface);
				translate([ screw_mount_x/2-screw_hole_od/2-screw_margin, screw_mount_y/2-screw_hole_od/2-screw_margin,-scoche]) cylinder(r=servo_hole_pilot/2+case_thickness/2,h=extra+spline_distance_to_screw_surface);
			}
			hull() { // make sure they are attached to the other thing
				translate([-screw_mount_x/2+screw_hole_od/2+screw_margin,-screw_mount_y/2+screw_hole_od/2+screw_margin,-scoche]) cylinder(r=servo_hole_pilot/2+case_thickness/2,h=extra);
				translate([-screw_mount_x/2+screw_hole_od/2+screw_margin, screw_mount_y/2-screw_hole_od/2-screw_margin,-scoche]) cylinder(r=servo_hole_pilot/2+case_thickness/2,h=extra);
				translate([ screw_mount_x/2-screw_hole_od/2-screw_margin,-screw_mount_y/2+screw_hole_od/2+screw_margin,-scoche]) cylinder(r=servo_hole_pilot/2+case_thickness/2,h=extra);
				translate([ screw_mount_x/2-screw_hole_od/2-screw_margin, screw_mount_y/2-screw_hole_od/2-screw_margin,-scoche]) cylinder(r=servo_hole_pilot/2+case_thickness/2,h=extra);
			}
		}else union() { // the stand-offs
			translate([-screw_mount_x/2+screw_hole_od/2+screw_margin,-screw_mount_y/2+screw_hole_od/2+screw_margin,-scoche]) cylinder(r=servo_hole_pilot/2+case_thickness/2,h=extra+spline_distance_to_screw_surface);
			translate([-screw_mount_x/2+screw_hole_od/2+screw_margin, screw_mount_y/2-screw_hole_od/2-screw_margin,-scoche]) cylinder(r=servo_hole_pilot/2+case_thickness/2,h=extra+spline_distance_to_screw_surface);
			translate([ screw_mount_x/2-screw_hole_od/2-screw_margin,-screw_mount_y/2+screw_hole_od/2+screw_margin,-scoche]) cylinder(r=servo_hole_pilot/2+case_thickness/2,h=extra+spline_distance_to_screw_surface);
			translate([ screw_mount_x/2-screw_hole_od/2-screw_margin, screw_mount_y/2-screw_hole_od/2-screw_margin,-scoche]) cylinder(r=servo_hole_pilot/2+case_thickness/2,h=extra+spline_distance_to_screw_surface);
		}
		union() { // the screw holes
			translate([-screw_mount_x/2+screw_hole_od/2+screw_margin,-screw_mount_y/2+screw_hole_od/2+screw_margin,-scoche]) cylinder(r=servo_hole_pilot/2,h=extra+spline_distance_to_screw_surface+scoche);
			translate([-screw_mount_x/2+screw_hole_od/2+screw_margin, screw_mount_y/2-screw_hole_od/2-screw_margin,-scoche]) cylinder(r=servo_hole_pilot/2,h=extra+spline_distance_to_screw_surface+scoche);
			translate([ screw_mount_x/2-screw_hole_od/2-screw_margin,-screw_mount_y/2+screw_hole_od/2+screw_margin,-scoche]) cylinder(r=servo_hole_pilot/2,h=extra+spline_distance_to_screw_surface+scoche);
			translate([ screw_mount_x/2-screw_hole_od/2-screw_margin, screw_mount_y/2-screw_hole_od/2-screw_margin,-scoche]) cylinder(r=servo_hole_pilot/2,h=extra+spline_distance_to_screw_surface+scoche);
		}
	}
}

module pipe_elbow(id,od,lead_in=0,lead_out=0,do_inside=true,do_outside=true,angle=90,num_barbs=3,barb_height=1,barb_width=2.5,barbs_on_inlet=false,barbs_on_outlet=true)
{
	lead_in=max(lead_in,inlet_dia/2);
	lead_out=max(lead_out,inlet_dia/2);
	if(do_inside&&do_outside) difference(){
		pipe_elbow(id,od,lead_in,lead_out,false,true,angle);
		pipe_elbow(id,od,lead_in,lead_out,true,false,angle);
	} else if(do_inside) union() {
		rotate([0,90,0])cylinder(r=id/2,h=lead_in+scoche);
		sphere(r=id/2);
		rotate([0,90-angle,0]) cylinder(r=id/2,h=lead_out+scoche);
	} else if(do_outside) union() {
		rotate([0,90,0])cylinder(r=od/2,h=lead_in);
		sphere(r=od/2);
		rotate([0,90-angle,0]) union() {
			cylinder(r=od/2,h=lead_out);
			if(num_barbs>0&&barbs_on_outlet) for(i=[0:num_barbs-1]) {
				translate([0,0,lead_out-barb_width*(i+1)]) cylinder(r2=od/2,r1=od/2+barb_height,h=barb_width);
			}
		}
	}
}

if (exploded_view){
	if(show_control) translate([0,0,40+case_thickness+inner_cavity_height]) if(control_via==0){
			servo();
		}else{
			handle();
		}
	if(show_top) translate([0,0,20]) case_top();
	if(show_selector) selector();
	if(show_bottom) translate([0,0,-20]) case_bottom();
}
else{
	if(show_control) translate([0,0,case_thickness+inner_cavity_height+selector_thickness]) if(control_via==0){
			translate([0,0,selector_thickness]) servo();
		}else{
			translate([0,0,handle_shaft_height-handle_thickness]) handle();
		}
	if(show_top) case_top();
	if(show_selector) selector();
	if(show_bottom) case_bottom();
}

```


[User]
Hey there! I'm looking to get a customizable cone hinge designed in OpenSCAD. I've seen some good examples, but I'd like to have one where I can control several parameters.

Specifically, I need to be able to adjust:

*   **Overall Length of the hinge:**  This would be the total length of the hinge structure when assembled.
*   **Height (Diameter) of the hinge:** This determines the overall size/diameter of the cylindrical parts of the hinge.
*   **Clearance between the cones and the holes they fit into:**  This needs to be adjustable so I can fine-tune the fit for my printer.
*   **Gap between the hinge and the sides:**  I need some space between the hinge parts and any surrounding material for easy movement.
*   **The radius of the cones:** Should be calculated as half of the height.
* **The height of the cones:** Should be calculated as a multiple of the radius

The hinge design should be based on cylinders and cones, with the two halves interlocking. I'd also like to have some simple bar shapes for attachment points. These bars should have adjustable thickness to match the main hinge structure.

The code should include a main hinge module as well as a module for the bars. It should also make use of a $fn variable to control the fineness of the curved surfaces and a fudge variable to help with mesh integrity when rendering.  Please also allow for a small corner space between the hinge and the attachment structure, ideally configurable as a corner parameter.

Finally, it would be really useful if the design could be oriented to print with the hinge axis along the Z-axis.

[Assistant]
day343_mathgrrl_hinge.scad:
```
// mathgrrl cone hinge

//////////////////////////////////////////////////////
// parameters

// Length of the complete hinge
length = 20;

// Height (diameter) of the hinge
height = 3;

// Clearance between cones and holes
clearance = .7;

// Clearance between hinge and sides
gap = .6;

// Parameters that the user does not get to specify
$fn=24*1;
border = 2*1;
fudge = .01*1;			// to preserve mesh integrity
corner = 0*1;      	// space between hinge and corner
hinge_radius = height/2;
cone_height = 1.5*hinge_radius;

//////////////////////////////////////////////////////
// renders

rotate(90,[0,1,0])
	translate([-hinge_radius,0,0])
		hinge();

translate([0,hinge_radius+gap,0]) bar();
translate([0,-2*border-hinge_radius-gap,0]) bar();

//translate([0,hinge_radius+gap,0]) square();
//translate([0,-length-hinge_radius-gap,0]) square();

//////////////////////////////////////////////////////
// module for hinge

module hinge(){
	rad = hinge_radius;
	clr = clearance;
	len = (length-2*corner)/3;
	con = cone_height;
	// left outside hinge = (cylinder+box)-cone
	difference(){
		union(){
			translate([0,0,corner]) cylinder(h=len-clr,r=rad);
			translate([-rad,0,corner]) cube([2*rad,rad+gap,len-clr]);
		}
		translate([0,0,corner+len-con-clr+fudge]) cylinder(h=con,r1=0,r2=rad);
	}
	// inside hinge = cylinder+box+cone+cone
	union(){
		translate([0,0,corner+len]) cylinder(h=len,r=rad);
		translate([-rad,-rad-gap,corner+len]) cube([2*rad,rad+gap,len]);
		translate([0,0,corner+len-con]) cylinder(h=con,r1=0,r2=rad);
		translate([0,0,corner+2*len]) cylinder(h=con,r1=rad,r2=0);
	}
	// right outside hinge = (cylinder+box)-cone
	difference(){
		union(){
			translate([0,0,corner+2*len+clr]) cylinder(h=len-clr,r=rad);
			translate([-rad,0,corner+2*len+clr]) cube([2*rad,rad+gap,len-clr]);
		}
		translate([0,0,corner+2*len+clr-fudge]) cylinder(h=con,r1=rad,r2=0);
	}
}

//////////////////////////////////////////////////////
// module for square shape

module square(){
	difference(){
		cube([length,length,height]);
		translate([border,border,-fudge])
			cube(	[length-2*border,length-2*border,height+2*fudge]);
	}
}

//////////////////////////////////////////////////////
// module for bar shape

module bar(){
	cube([length,2*border,height]);
}

```


[User]
I'm looking for a design for screw caps that can also act as nuts for drywall or similar materials. I've got a basic idea in mind, but need help making it parametric in OpenSCAD.

The core idea is a cap with a cylindrical stem that will fit over a screw head. This stem transitions into a wider base. The cap should also have a central cavity that goes up most of the height of the stem, so the screw can be recessed. Think of it like a plastic nut that's also a cap.

Here's what I'm thinking for the basic structure, and the parameters I want to control:

*   **`stem_radius`**: The radius of the cylindrical stem that fits over the screw head.
*   **`stem_height`**: The height of the stem.
*   **`cavity_radius`**: The radius of the central cavity. It should be slightly larger than the screw shank, so the screw doesn't bind.
*   **`cavity_height`**: The height of the central cavity, which should be slightly more than the stem height.
*   **`base_radius`**: The radius of the wider base of the cap.
*   **`base_height`**: The height of the wider base.
*   **`fillet_radius`**: A radius to create a fillet at the transition between the stem and base.
*   **`fin_width`**: The width of three stabilizing fins that should stick out from the base to help prevent rotation when acting as a nut. These should be attached at the base and rise up the stem height.

I'd also like to control the polygon count for both fine and coarse details using `highrez` and `lowrez` variables. So, for most of the cap, I'd use `$fn = highrez`, but for the fins and cavity, I want to use `$fn = lowrez` to keep the processing time down.

Finally, I'd like a parametric way to make a chamfer around the edge of the base that would effectively round the entire bottom, and a way to cut away the center of the bottom using a boolean difference. It is vital that this is a parametric chamfer, and not one done with a `linear_extrude()`.

I'm hoping the fins will extend all the way to the top of the stem, and be smoothly attached at the base. Can you please create a parametric OpenSCAD file for this? I'm not currently planning on using any libraries.

[Assistant]
ScrewCap.scad:
```
stem_radius = 3.25;
stem_height = 20;
cavity_radius = 1.8;
cavity_height = 22;
base_radius = 7.5;
base_height = 2;
fillet_radius = 1.5;
fin_width = 1;
lowrez = 24;
highrez = 60;

$fn = highrez;

module fin () {
hull () {
translate ([stem_radius,0,base_height])
sphere (r=fin_width/2, $fn=lowrez);
translate ([base_radius-fin_width/2,0,base_height])
sphere (r=fin_width/2, $fn=lowrez);
translate ([stem_radius-fin_width,0,base_height+stem_height])
sphere (r=fin_width/2, $fn=lowrez);
}
}

difference () {

union () {

translate ([0,0,base_height])
difference () {

rotate_extrude ()
translate([stem_radius, 0, 0])
square (fillet_radius);

translate ([0,0,fillet_radius])
rotate_extrude ()
translate([stem_radius+fillet_radius, 0, 0])
circle(r = fillet_radius);
}
translate ([0,0,base_height])
cylinder (r=stem_radius, h=stem_height);

cylinder (r=base_radius, h=base_height);

translate ([0,0,base_height+stem_height])
sphere (r=stem_radius);

}

translate ([0,0,-.01])
cylinder (r=cavity_radius, h=cavity_height, $fn=lowrez);
translate ([0,0,cavity_height-.01])
cylinder (r1=cavity_radius, r2=.01,h=cavity_radius, $fn=lowrez);

}

fin ();
rotate ([0,0,120])
fin ();
rotate ([0,0,240])
fin ();

difference () {

rotate_extrude ()
translate ([base_radius,0,0])
circle (r=base_height);

translate ([0,0,-base_height/2])
cube ([base_radius*3, base_radius*3, base_height], center=true);
}
```


[User]
I'd like to design a customizable, hinged, snap-together cube that can be printed flat and then folded into a cube. It should be parametric, allowing for easy adjustment of the cube's size, the thickness of the material, and the clearances between the hinges and snaps.

Specifically, I'd like to be able to control the following parameters:

*   `length`: The side length of the cube.
*   `border`: The width of the border edge of the polygon making up each face of the cube.
*   `height`: The thickness of the side pieces (which would be the height when printed).
*   `clearance`: The clearance between the hinge cones and holes.
*   `gap`: The clearance between the hinges and the sides of the cube faces.
*   `space`: The clearance between the snap tines.
*   `$fn`: Number of facets for circular objects - default to 24*1, but I'd like to be able to increase that if I need.
*   `corner`: space between hinge and corner. This should default to 0 but I need to be able to adjust it.

The design should consist of a central square, and then four other squares attached to it, plus another square attached to one of those. The first four squares should be attached by hinges, and the fifth square should be attached to the fourth by another hinge and then snap to the central square. I'd like for all parts to be printed flat. Each side of the cube should be a regular polygon of configurable number of sides (`sides`), so I'd like to be able to easily switch between a cube (4-sided polygon), an octahedron (3-sided polygon), a dodecahedron (5 sided polygon) or others, but the default should be a cube.

The hinges should consist of interlocking cylinders, and the snaps should be rounded rectangular tines. I'd like to be able to control the number of snaps per edge. By default, there should be three.

The code should be written so it's easy to modify the number of sides on the polygon (cube, etc.) and the number of snaps.

I'm not picky about the arrangement of the cube net - the layout in the provided file works. I don't need to specify a certain library, but please don't use anything experimental - I want the code to compile without issues.

[Assistant]
day344_hingesnap_cubenet.scad:
```
// mathgrrl hinge/snap cube nets

//////////////////////////////////////////////////////
// parameters

/* [Size] */

// Side length of the cube
length = 20;

// Width of the border edge
border = 2;

// Thickness of the side pieces (height when printing)
height = 3;

/* [Clearances] */

// Clearance between hinge cones and holes
clearance = .6;

// Clearance between hinge and sides
gap = .6;

// Clearance between snap tines
space = .6;

// Parameters that the user does not get to specify
$fn=24*1;
fudge = .01*1;			// to preserve mesh integrity
hinge_radius = height/2;
cone_height = 1.5*hinge_radius;
corner = 0*1;      	// space between hinge and corner

//////////////////////////////////////////////////////
// render

// center square
poly_maker(sides=4);
attach(type=1,side=1,sides=4);
attach(type=1,side=2,sides=4);
attach(type=1,side=3,sides=4);
attach(type=1,side=4,sides=4);

// west square
translate([	(length+2*hinge_radius+2*gap)/sqrt(2),
					-(length+2*hinge_radius+2*gap)/sqrt(2),
					0])
	union(){
		poly_maker(sides=4);
		attach(type=2,side=2,sides=4);
		attach(type=2,side=3,sides=4);
		attach(type=2,side=4,sides=4);
	}

// north square
translate([	-(length+2*hinge_radius+2*gap)/sqrt(2),
					-(length+2*hinge_radius+2*gap)/sqrt(2),
					0])
	union(){
		poly_maker(sides=4);
		attach(type=2,side=1,sides=4);
		attach(type=2,side=2,sides=4);
		attach(type=2,side=3,sides=4);
	}

// east square
translate([	-(length+2*hinge_radius+2*gap)/sqrt(2),
					(length+2*hinge_radius+2*gap)/sqrt(2),
					0])
	union(){
		poly_maker(sides=4);
		attach(type=2,side=1,sides=4);
		attach(type=2,side=2,sides=4);
		attach(type=2,side=4,sides=4);
	}

// south square
translate([	(length+2*hinge_radius+2*gap)/sqrt(2),
					(length+2*hinge_radius+2*gap)/sqrt(2),
					0])
	union(){
		poly_maker(sides=4);
		attach(type=2,side=1,sides=4);
		attach(type=2,side=3,sides=4);
		attach(type=1,side=4,sides=4);
	}

// souther square
translate([	2*(length+2*hinge_radius+2*gap)/sqrt(2),
					2*(length+2*hinge_radius+2*gap)/sqrt(2),
					0])
	union(){
		poly_maker(sides=4);
		attach(type=2,side=1,sides=4);
		attach(type=2,side=3,sides=4);
		attach(type=2,side=4,sides=4);
	}

//////////////////////////////////////////////////////
// module for hinge

module hinge(){

	rad = hinge_radius;
	clr = clearance;
	len = (length-2*corner)/3;
	con = cone_height;

	rotate(90,[0,1,0]) rotate(-90,[1,0,0])
	translate([-rad,-rad-gap+fudge,0])
		union(){

			// left outside hinge = (cylinder+box+tooth)-cone
			difference(){
				union(){
					translate([0,0,corner]) cylinder(h=len-clr,r=rad);
					translate([-rad,0,corner]) cube([2*rad,rad+gap,len-clr]);
				}
				translate([0,0,corner+len-con-clr+fudge]) cylinder(h=con,r1=0,r2=rad);
			}

			// inside hinge = cylinder+box+cone+cone
			union(){
				translate([0,0,corner+len]) cylinder(h=len,r=rad);
				translate([-rad,-rad-gap,corner+len]) cube([2*rad,rad+gap,len]);
				translate([0,0,corner+len-con]) cylinder(h=con,r1=0,r2=rad);
				translate([0,0,corner+2*len]) cylinder(h=con,r1=rad,r2=0);
			}

			// right outside hinge = (cylinder+box)-cone
			difference(){
				union(){
					translate([0,0,corner+2*len+clr]) cylinder(h=len-clr,r=rad);
					translate([-rad,0,corner+2*len+clr]) cube([2*rad,rad+gap,len-clr]);
				}
				translate([0,0,corner+2*len+clr-fudge]) cylinder(h=con,r1=rad,r2=0);
			}

		}
}

//////////////////////////////////////////////////////
// module for snap

module snap(sides){

radius = length/(2*sin(180/sides));
snapwidth = radius*sin(180/sides)/3;

//build snaps for first side at the origin and move into positions
for(i=[0:2]){

	//for i^th snap translate 2*i snapwidths over from origin
	translate([0-fudge,2*i*snapwidth,0-fudge])

		//rounded box for snap made from a box and cylinder
		union(){

			//cube part of snap shape at the origin
			cube([height/2+gap+fudge,snapwidth-space+fudge,height+fudge]);

			//round part of snap shape at the origin
			//move cylinder to the end of the box
			translate([height/2+gap,snapwidth-space+fudge,height/2])

				//rotate cylinder to match box orientation
				rotate(90,[0,1,0])
					rotate(90,[1,0,0])

						//cylinder of the correct size to match box
						cylinder(
							r=height/2,
							h=snapwidth-space,
							$fn=16  //number of sides
						);
					}
			}

}

//////////////////////////////////////////////////////
// module for polygon shape
//shape is made up of n=sides wedges that are rotated around

module poly_maker(sides){

	radius = length/(2*sin(180/sides));
	inside = radius-border/(cos(180/sides));

	translate([0,0,height/2])

	//subtract the smaller polygon from the larger polygon
	difference(){

		//extrude to thicken the polygon
		linear_extrude(height=height,center=true){

			//rotate the wedge n=sides times at angle of 360/n each time
			for(i=[0:sides]){

				//rotation is around the z-axis [0,0,1]
				rotate(i*360/sides,[0,0,1])

					//make triangular wedge with angle based on number of sides
					polygon(

						//the three vertices of the triangle
						points = [[0-.05,0-.05], //tweaks fix CGAL errors
									 [radius,0-.01],
									 [radius*cos(360/sides)-.01,radius*sin(360/sides)+.01]],

						//the order to connect the three vertices above
						paths = [[0,1,2]]
					);
			}
		}
		//extrude to thicken the center polygon that will be the hole
		linear_extrude(height=height+2,center=true){

			//rotate the wedge n=sides times at angle of 360/n each time
			for(i=[0:sides]){

				//rotation is around the z-axis [0,0,1]
				rotate(i*360/sides,[0,0,1])

					//make triangular wedge with angle based on number of sides
					polygon(

						//the three vertices of the triangle
						points =	[[0-.1,0-.1], //tweaks fix CGAL errors
									 [inside,0-.01],
									 [inside*cos(360/sides)-.01,inside*sin(360/sides)+.01]],

						//the order to connect the three vertices above
						paths = [[0,1,2]]
					);
			}
		}
	}
}

//////////////////////////////////////////////////////
// module for attaching hinges or snaps to shape
// type=1 for hinges, type=2 for snaps

module attach(type,side,sides){

	radius = length/(2*sin(180/sides));

	//rotation is around the z-axis [0,0,1]
	rotate(side*360/sides,[0,0,1])

		//translate the attachment to the first side
		translate([radius,0,0+fudge])

			//rotate the attachment to correct angle for first side
			rotate(180/sides)

				union(){
					if (type==1) hinge();
					if (type==2) snap(sides);
				}

}
```


[User]
I've got a design for a tiffin carrier handle, and I'd like to make it parametric so I can easily adjust it for different tubing sizes. I'm currently using 22mm water pipe, but I want to be able to use different sizes easily.

The basic idea is that the handle consists of two identical end pieces that slot into the ends of a tube. These end pieces are essentially a kind of cap that has a peg that fits inside the tube. When you have two of them, one on each end, you can hold the tube, and it will be balanced.

Here's the specifics of each end piece as I imagine it:

*   **Tube Interface:**
    *   There's a main block that will fit into the end of the tube (the "peg"). It needs to have a diameter that is equal to the *inner diameter* of the tube, and a short cylinder extending outwards to match the *outer diameter* of the pipe. This ensures that it fits snugly, and it needs to be a parametric variable that I can adjust.
    *   The thickness of the wall of the pipe is a parameter too, so I can adjust that as needed for different types of tubing.
    *   The peg should have a length of about 30mm, give or take, but that should also be a variable I can adjust.
*   **Grip Interface:**
    *   Extending from the other side of this tube interface is a roughly cuboid section to grip onto. This should have a length of approximately 80mm, a width of 28mm and a height that matches the *outer diameter* of the tubing that was calculated earlier, that is, the inner diameter plus the wall thickness times two.
    *   This cuboid should be centered on the peg, along its length.
    *   It should be flattened slightly so it's not a complete block.
    *   There's also a small, rounded lip on the outside part of the peg.
*   **Parametric Design:**
    *   I need to be able to control the *inner diameter* of the tube, the *wall thickness* of the tube, the length of the peg, the grip block length, and, and I suppose the height offset of the lip. I suppose there could be a separate variable for the length of the flattened block, too.
*  **Libraries:** I am _not_ using any OpenSCAD libraries for this one, please write everything from scratch.

Could you generate a parametric OpenSCAD file for this design? I think that should be enough for now. Let me know if you need any additional information, I can try to clarify what I have in mind.

[Assistant]
TiffinHandle.scad:
```
/////////////////////////////////////////////////////////////////////////
//
//  'Tiffin Carrier Handle' by Chris Molloy (http://chrismolloy.com/)
//
//  Released under Creative Commons - Attribution - Share Alike licence
//
/////////////////////////////////////////////////////////////////////////

// Inner diameter of handle tube
pipe_id = 18;

// Wall thickness of handle tube
pipe_wall = 2.5;

/* Hidden */
pipe_od = pipe_wall + pipe_id + pipe_wall;
peg_radius = pipe_id / 2;
$fn = 100;

union() {
  translate([0, 0, pipe_od / 2]) {
    difference() {
      cube([28, 80, pipe_od], center = true);
      translate([0, 0, 4]) {
        cube([20, 90, pipe_od], center = true);
      }
    }
  }
  translate([29, 0, peg_radius + pipe_wall]) {
    rotate([0, 90, 0]) {
      cylinder(h = 30, r1 = peg_radius, r2 = peg_radius - 1, center = true);
    }
    translate([-14.5, 0, 0]) {
      rotate([0, 90, 0]) {
        cylinder(h = 1, r1 = peg_radius + pipe_wall, r2 = peg_radius, center = true);
      }
    }
    translate([14, 0, 0]) {
      rotate([0, 90, 0]) {
        rotate_extrude(convexity = 10)
        translate([peg_radius - 1, 0, 0])
        circle(r = 1);
      }
    }
  }
}
```


[User]
I'd like to create a parametric GT2 belt clip in OpenSCAD, and I'd like it to be somewhat customizable. I'd like to be able to choose between two different tooth profiles - one based on the original design which uses cylinders to cut out the tooth profile, and a remixed version that uses square teeth cutouts.

Here's a breakdown of the parameters I need:

*   **Belt Width:**  The width of the belt, typically 6mm but needs to be adjustable.
*   **Belt Thickness:** The thickness of the belt, needs to be slightly less than the actual belt thickness for compression.
*  **Belt Pitch:** The distance between teeth on the belt, set to 2mm for GT2 belts.
*  **Tooth Radius:** The radius of the cylindrical tooth cutouts used in the original design.
*   **Tooth Length:** The length of the square teeth in the remixed design.
*   **Clamp Width:** The overall width of the clip.
*   **Clamp Length:** The overall length of the clip.
*   **Clamp Base Thickness:** The thickness of the base of the clip.
*   **Show:** A selector to control which design is shown (1 for remixed, 2 for original, 3 for both).

The design involves a main body with two mirrored cutouts for the belt.

For the original design, these cutouts use a `tube` module to create an annular cutout, and then adds cylindrical cutouts around it to form the teeth.

The remixed design uses a `tube` module as well, but then uses a linear_extrude to make the square tooth cutouts.

I'd also like the code to be well-commented so I can understand how it works later. It would be really helpful if you could generate all the necessary `.scad` files to make this work.

[Assistant]
belt_clips.scad:
```
/* [Global] */

// typically 6 (mm)
belt_width = 6; // [3:15]

// should slightly less than actual belt thickness for compression fit, typically 1 - 0.05 (mm)
belt_thickness = 0.95;

// - tooth pitch on the belt, 2 for GT2 (mm)
belt_pitch = 2.0;

// - belt tooth radius, 0.8 for GT2 (mm) - original version only
tooth_radius = 0.8;

// - belt tooth length (mm) - remized version only
tooth_length = 2;

// (overall clamp width, mm)
clamp_width = 15;
// (overall clamp height, mm)
clamp_length = 15;
// (overall clamp base thickness, mm)
clamp_base = 4;

show = 1; // [1:remixed,2:original,3:both]

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

/* [Hidden] */

path_height = belt_width + 1;
clamp_thickness = path_height+clamp_base;

$fn = 40;

clamp_inside_radius = clamp_width/2;
clamp_outside_radius = clamp_inside_radius+belt_thickness;
dTheta_inside = belt_pitch/clamp_inside_radius;
dTheta_outside = belt_pitch/clamp_outside_radius;
pi = 3.14159;

small = 0.01;  // avoid graphical artifacts with coincident faces

module tube(r1, r2, h) {
  difference() {
    cylinder(h=h,r=r2);
    translate([0, 0, -1]) cylinder(h=h+2,r=r1);
	echo(h);
  }
}

module belt_cutout(clamp_radius, dTheta) {
  // Belt paths
  tube(r1=clamp_inside_radius,r2=clamp_outside_radius,h=path_height+small);
  for (theta = [0:dTheta:pi/2]) {
    translate([clamp_radius*cos(theta*180/pi),clamp_radius*sin(theta*180/pi),0]) cylinder(r=tooth_radius, h=path_height+small);
  }
}

module belt_clips() {
  difference() {
    cube([clamp_width,clamp_length,clamp_thickness]);
    translate([0,0,clamp_base]) {
      belt_cutout(clamp_inside_radius, dTheta_inside);
      translate([clamp_width,clamp_length,0]) rotate([0, 0, 180])
        belt_cutout(clamp_outside_radius, dTheta_outside);
    }
  };
}

module belt_cutout2(clamp_in, clamp_mid, clamp_out, dTheta) {
  // Belt paths
  tube(r1=min(clamp_in, clamp_mid),r2=max(clamp_in, clamp_mid),h=path_height+1);

  for (theta = [-dTheta/4:dTheta:pi/2+dTheta/4]) {
    linear_extrude(height=path_height+small, center=false) {
      polygon(points = [
        [cos(theta*180/pi) * clamp_out, sin(theta*180/pi) * clamp_out],
        [cos(theta*180/pi) * ((clamp_in+clamp_mid)/2), sin(theta*180/pi) * ((clamp_in+clamp_mid)/2)],
        [cos((theta+dTheta/2)*180/pi) * ((clamp_in+clamp_mid)/2), sin((theta+dTheta/2)*180/pi) * ((clamp_in+clamp_mid)/2)],
        [cos((theta+dTheta/2)*180/pi) * clamp_out, sin((theta+dTheta/2)*180/pi) * clamp_out]
      ]);
    }
  }
}

module belt_clips2() {
  difference() {
    cube([clamp_width,clamp_length,clamp_thickness]);
    translate([0,0,clamp_base]) {
      belt_cutout2(clamp_inside_radius, clamp_outside_radius, clamp_outside_radius-tooth_length, dTheta_inside);
      translate([clamp_width,clamp_length,0]) rotate([0, 0, 180])
        belt_cutout2(clamp_outside_radius, clamp_inside_radius, clamp_inside_radius+tooth_length, dTheta_outside);
    }
  };
}

if((show == 1) || (show == 3))
	belt_clips2();

if(show == 3)
	translate([-clamp_width-3,-clamp_length-3,0]) color([1,0,0])
		belt_clips();
if(show == 2)
	belt_clips();
```


[User]
I need an OpenSCAD design for a custom spool, and I'd like it to be parametric so I can adjust the dimensions. I have some existing code I've been working with, but I'd like to start fresh and build up the design in a more modular fashion.

Here's the basic idea: The spool will have a central hub, with a slightly wider brim at each end. The hub itself will be hollowed out, and there should be several holes around the circumference for attachment or ventilation. In the center, there will be a shaft hole going all the way through.

Specifically, I'd like the following parameters to be adjustable:

*   `hub_diameter`: The outer diameter of the main cylindrical part of the hub (excluding the brim)
*   `hub_height`: The height of the main hub cylinder.
*   `shaft_diameter`: The diameter of the central shaft hole.
*   `wall_thickness`: The thickness of the material making up the hub (the space between the outer and inner diameter of the hub).
*   `brim_width`: The width of the brim that extends out from the hub.
*   `hole_diameter`: The diameter of the circumference holes.
*   `hole_count`: The number of evenly spaced holes around the hub circumference.

I'd also like to make sure that the hub's outer diameter is consistent, and then the brim extends outwards from that. All the cylinder heights should be based on the hub height, not on the brim or any other component.

I'm hoping you can provide the code with clear modules for each part of the design, and I'm happy to use the MCAD library to assist in the design. I'd like all of the code to be in a single `.scad` file.

[Assistant]
custom_spool.scad:
```
hub_diameter=32;
hub_height=4;
shaft_diameter=9;
wall_thickness=1;
brim_width=2;
hole_diameter=9;
$fn=24;
difference() {
	body();
	shaft();
	holes();
}
module body() {
	cylinder(d=hub_diameter+brim_width*2,h=wall_thickness);
	difference() {
		cylinder(d=hub_diameter,h=hub_height+wall_thickness);
		cylinder(d=hub_diameter-wall_thickness*2,h=hub_height+wall_thickness);
	}
}
module shaft() {
	cylinder(d=shaft_diameter,h=hub_height);
}
module holes() {
	offset=hub_diameter/2-wall_thickness-hole_diameter/2;
	for(i=[0:360/6:360]) {
		rotate([0,0,i])
			translate([offset,0,0])
			cylinder(d=hole_diameter,h=wall_thickness);
	}
}
```


[User]
I'm looking for a way to create a custom bracelet with a poem wrapped around it in a spiral. I found this older design on Thingiverse that gets close (http://www.thingiverse.com/thing:437232, http://www.thingiverse.com/thing:441889), but I want something that is more flexible and parametric.

Here's the general concept: I want to input a string of text (the poem) and have it wrap around a bracelet in a spiral. I need to control several parameters including:

*   **`text`**: The poem or text to be displayed on the bracelet. This can be any length.
*   **`wristDiameter`**: The diameter of the wrist in millimeters. This will determine the bracelet's inner size.
*   **`fontSize`**: The font size of the text in millimeters. This should affect the height of the letters and impact how much text can wrap around the bracelet.
*   **`bandHeight`**: The height of the bracelet band in millimeters. This is the vertical height of each spiral loop.
*   **`braceletThickness`**: The thickness of the bracelet material in millimeters. This controls how chunky or thin the bracelet feels.
*   **`font`**: Choose a font from a list. I'm thinking maybe 4 options, like: BlackRose, Letters, orbitron, knewave.
*   **`letterDepth`**: The depth of the letters, controlling how much the letters are engraved into the band in millimeters.
*   **`space`**: A parameter that effects the letter spacing.

The script should calculate the number of twists required to accommodate the text based on the circumference of the wrist and the font size. It also should correctly tilt the letters for the spiral and make it easy to change the rotation of the spiral.

I see in the example that it uses a `writecylinder` function from `write/Write.scad`, so I'd like to reuse that same functionality. It looks like it also calculates some angles and lengths, so those will need to be reimplemented.

Could you generate the necessary OpenSCAD files, including one for the main bracelet design and any dependencies (aside from `write/Write.scad`)? It should be parametric so that I can change any of the parameters above.

[Assistant]
Poem_Bracelet_Upload.scad:
```
/* [Basics] */
// Insert your poem
text = "This line is full of words that go on and on and  on and on and  on and on and  on and on and  on and on and  on and on and  on.";
// (mm)
wristDiameter = 66;
// Smaller font size makes a smaller bracelet
fontSize = 6.0;

/* [Extras] */

// (mm) Just like line spacing
bandHeight = 12;
// (mm) Big and chunky or slim and elegant
braceletThickness = 1.2;
// Choose a font.
font = 1;// [0:BlackRose, 1:Letters, 2:orbitron, 3:knewave]
// (mm) Make the letters deeper
letterDepth = 2;

/* [Hidden] */
// All done. Customizer doesn't need to see all this
wristRadius = wristDiameter/2;
font_array = ["BlackRose.dxf", "Letters.dxf", "orbitron.dxf", "knewave.dxf"];
$fa = 1;
use <write/Write.scad>
circumference = 2*3.14159*(wristRadius+braceletThickness);

space = 1;
//fontSize=8;
wid=(.125* fontSize *5.5 * space);
tiltedTextScaleFactor = sqrt(bandHeight*bandHeight + circumference*circumference)/circumference;
lengthOfText = wid*(len(text))*tiltedTextScaleFactor;//*.99 to fudge for the diagonal
numberOfTwists = lengthOfText/circumference;
angleOffset = (((numberOfTwists)/2)*360);

length = (numberOfTwists+1)*bandHeight;
rotate([0,0,angleOffset])
difference(){
tube();
spiralcut();
};
tiltAngle = atan(bandHeight/circumference)*1.5;

color("green")writecylinder(text,[0,0,0],t = letterDepth,radius=wristRadius+braceletThickness,height=0,h=fontSize,space=space,rotate=tiltAngle,east=90,up=bandHeight*.02,font=font_array[font]);

module tube(){
difference(){
cylinder(r = wristRadius+braceletThickness, h = length,center=true);
cylinder(r = wristRadius, h = length+1,center=true);
}
}

module spiralcut(){
linear_extrude(height = length, center = true, convexity = 10, twist = length/bandHeight*360, $fn = 100)
translate([wristRadius - 2.5, 0, 0])
square([5,100]);
}

```


[User]
I'd like to create a customizable stand for box-shaped objects, something that looks a bit modern and is easy to 3D print. I'm thinking it should have two mirrored parts, which I can either print individually or both at the same time.

Here's what I'd like to be able to customize:

*   **Part Selection:** I need to be able to choose if I want to print just the left part, the right part, or both parts together. Let's call this `part` with options "left", "right", and "both".
*   **Stand Dimensions:** Each part of the stand should have a `stand_width` and `stand_height`.
*   **Object Thickness:** I want to be able to set the `object_thickness` to accommodate different sized items.
*   **Angle:** The object should lean back slightly, so I need to be able to set an `angle_deviation`. It should have a reasonable range, like 5 to 45 degrees.
*   **Wall Thickness:** The stand should have a `wall_thickness` to provide some strength and to fit my items snugly.
*   **Frame Size:** The object should have some support from a frame on the front face, so I need to specify a `frame_size`.
*   **Sphere Radius:** On the back, there should be some supporting spheres. I need to control `sphere_radius` for those. This value will need to be less than half the stand width and half the stand height to avoid the spheres protruding.

I'd like a clean look with rounded corners for the main body and the sphere supports should be smooth. I'd also like a small gap between the object and the main back support, to account for the slope, as well as a similar gap between the frame and the object.

I believe that's everything, so let me know if you need more details.

[Assistant]
customizable_universal_stand.scad:
```
//CUSTOMIZER VARIABLES

// Your stand consists from too parts. Which one would you like to see?
part = "both"; // [left,right,both]

// Your stand consists from too parts. This is the width of one part.
stand_width = 70;

// Your stand consists from too parts. This is the height of one part.
stand_height = 60;

// Thickness of the object you want to fix.
object_thickness = 16;

// The slope of the object.
angle_deviation = 10;//[5:45]

// Thickness of the wall depends on the object you want to fix. Usually, 2 mm is enough for the most objects.
wall_thickness = 1.5;

// The frame supports your object from the front side.
frame_size = 6;

// From the back side the object is supported by spheres. This value should be less then half width and half height of the stand. If your object is light, this radius could be decreased.
sphere_radius = 25;

//HIDDEN VARIABLES

quality = +40;

stand_thickness = object_thickness + 2*wall_thickness;

//USED MODULES

// this holder covers the object
module holder()
{
	translate([0,0,sin(angle_deviation)*stand_thickness])
	rotate([-angle_deviation,0,0])

	intersection()
	{
		// special cylinder to round up sharp corners
		rotate([-90,0,0])
		resize(newsize=[2*stand_width,2*stand_height,stand_thickness])
		cylinder(h=10,r=10, $fn=quality);

		difference()
		{
			// external cube
			cube(size=[stand_width, stand_thickness, stand_height]);

			// internal cube
			translate([wall_thickness, wall_thickness, wall_thickness])
			cube(size=[stand_width, object_thickness, stand_height]);

			// cut off the frame for the object
			translate([wall_thickness+frame_size, wall_thickness-wall_thickness, wall_thickness+frame_size])
			cube(size=[stand_width, object_thickness, stand_height]);
		};
	}
}

// creates necessary back support for the holder
module fixer()
{
	internal_circle_size = stand_width*0.8;
	coef_height=1.5;

	difference()
	{
		union()
		{
			translate([0,stand_thickness,0])
			difference()
			{
				hull()
				{
					translate([stand_width-sphere_radius,0,0])
					sphere(r=sphere_radius, $fn=quality);
					translate([sphere_radius,0,])
					sphere(r=sphere_radius, $fn=quality);
				};

				hull()
				{
					translate([stand_width-sphere_radius,0,0])
					sphere(r=sphere_radius-wall_thickness, $fn=quality);
					translate([sphere_radius,0,])
					sphere(r=sphere_radius-wall_thickness, $fn=quality);
				};

				translate([0,-stand_width/2,-sphere_radius])
				cube([stand_width,stand_width,sphere_radius]);

				translate([0,-stand_width - stand_thickness*sin(angle_deviation),0])
				cube([stand_width,stand_width,sphere_radius]);
			}

			cube(size=[stand_width, stand_thickness, stand_thickness*sin(angle_deviation)]);
		}

		translate([0,0,sin(angle_deviation)*stand_thickness])
		rotate([-angle_deviation,0,0])
		cube(size=[stand_width, stand_thickness, stand_height]);

		rotate([-angle_deviation,0,0])
		translate([0,-sphere_radius,stand_thickness*sin(angle_deviation)])
		cube([stand_width,sphere_radius,2*sphere_radius]);
	}
}

module stand()
{
	union()
	{
		holder();
		fixer();
	}
}

module left_part()
{
	stand();
}

module right_part()
{
	translate([2*stand_width+5,0,0])
	mirror([1,0,0])
	stand();
}

// MAIN BODY

if (part == "left")
{
	left_part();
}
else if (part == "right")
{
	right_part();
}
else if (part == "both")
{
	left_part();
	right_part();
}
else {
	left_part();
	right_part();
}

```


[User]
I need a custom crevice tool for my vacuum cleaner. I'd like it to be parametric so I can easily adjust it to fit different vacuums and different crevice sizes.

Here's what I'm looking for:

*   **Shaft Diameter:**  This needs to be adjustable to fit different vacuum hoses. I'd like to be able to specify this as a parameter. The default should be 32 mm, but I'd like the range to be 10-60mm.
*   **Nozzle Opening Width:** The opening at the tip of the crevice tool needs to be adjustable, allowing me to control how wide it is. A default of 8mm is good, and I want a range between 1mm and 20mm.
*   **Crevice Length:** The overall length of the crevice tool should also be adjustable. I think 100mm should be a good default, and the range should be between 100mm and 500mm.
*   **Wall Thickness:** I need to be able to control the thickness of the nozzle walls. This is important for strength and printability. I'd like a default of 3mm, with a range of 1-10mm. I don't want it to be too flimsy but also don't want to use a ton of filament.

The design should essentially be a cylinder that transitions into a flattened crevice at one end. The transition from the round shaft to the flat nozzle should be smooth and somewhat aerodynamic, but not too overly complicated. I'm thinking you should make a 45-degree cut on the end of the cylinder to make the crevice shape, and then round off the sharp corner created by that cut.

I'd like the code to be in OpenSCAD. Could you please make that for me? No special libraries, just basic OpenSCAD functions.

[Assistant]
crevice_customizable.scad:
```
// How thick should the shaft be to fit your vaccuum?
shaft_diameter = 32; // [10:60]

// How wide should the tip of the nozzle open?
nozzle_opening = 8; // [1:20]

// How long should the crevice be in total?
crevice_length = 100; // [100:500]

// How thick should the walls of the nozzle be? (Thinner = less filament usage but more likely to break)
wall_thickness = 3; // [1:10]

module shape(rohrdurchmesser, duesenstaerke, laenge){

	difference(){
		union(){
			cylinder(laenge/2, r=rohrdurchmesser/2);
			intersection(){
					translate([-rohrdurchmesser/2,-duesenstaerke/2,laenge/2])
						cube([rohrdurchmesser,duesenstaerke,laenge/2]);
					translate([0,0,laenge/2])
						cylinder(laenge/2, r=rohrdurchmesser/2);
			}
		}
		for(i = [[-rohrdurchmesser/2,-laenge/2-duesenstaerke/2,laenge/2],[-rohrdurchmesser/2,laenge/2+duesenstaerke/2,laenge/2]])
			translate(i)
			rotate([0,90,0])
			cylinder(rohrdurchmesser, r=laenge/2);
	}
}

module fugenduese(rohrdurchmesser, duesenstaerke, laenge, wandstaerke){
$fn = 200;
blocklaenge = sqrt(pow((rohrdurchmesser+2*wandstaerke)*3/4,2)*2);
	difference(){
		shape(rohrdurchmesser+wandstaerke*2,duesenstaerke+wandstaerke*2,laenge); // duese erstellen

		translate([0,0,0]) shape(rohrdurchmesser,duesenstaerke,laenge); //duese aushoehlen

		translate ([(rohrdurchmesser+2*wandstaerke)/4,0,laenge])
	   rotate([0,-45,0]) translate([-blocklaenge,-(duesenstaerke+wandstaerke*2)/2-0.005,0]) cube([blocklaenge,duesenstaerke+wandstaerke*2+0.01,blocklaenge]); //im 45Grad Winkel abschneiden

		difference(){

			translate([(rohrdurchmesser+2*wandstaerke)/8+(rohrdurchmesser+2*wandstaerke)/16,-(duesenstaerke+2*wandstaerke)/2-0.005,laenge-(rohrdurchmesser+2*wandstaerke)/8/4+0.005]) cube([(rohrdurchmesser)/8, duesenstaerke+2*wandstaerke+0.01 ,(rohrdurchmesser+2*wandstaerke)/8/4+0.005]);

			translate([
(rohrdurchmesser+2*wandstaerke)/4+(((rohrdurchmesser)/8)-sqrt(pow((rohrdurchmesser+2*wandstaerke)/8,2))/2),
duesenstaerke/2+wandstaerke+0.01,
laenge-(rohrdurchmesser+2*wandstaerke)/8])
rotate([90,0,0]) cylinder(duesenstaerke+wandstaerke*2+0.02, r = (rohrdurchmesser+2*wandstaerke)/8);

		} // die Ecke der Schnittkante abrunden
	}

}

fugenduese(shaft_diameter,nozzle_opening,crevice_length,wall_thickness);

```


[User]
I'd like to create a hinged and snap-together tetrahedron using OpenSCAD, similar to the design by mathgrrl. I'm envisioning a flat design that can be printed, then folded and snapped into a tetrahedron shape.

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

*   **`length`**: The side length of the *final* tetrahedron.
*   **`border`**: The width of the border/edge of each triangular face.
*   **`height`**: The thickness of the individual triangular faces (also the print height).
*   **`clearance`**: The space between the hinge cones and holes.
*   **`gap`**: The space between the hinge and the sides of the triangle.
*   **`space`**: The space between the snap tines.

I'd like to have the design consist of four triangles laid out flat, connected by hinges and snaps so they can be folded together. The hinges should be on the edges that will meet when folding the tetrahedron, and the snaps should hold the final edge together. I would also like this to be parametric, allowing me to easily modify the above parameters, and have the object re-render.

I'm not too concerned about `$fn`, so you can handle that. I expect to use a reasonable value like 24. The `hinge_radius` should be half of the `height`. The `cone_height` should be 1.5 times the `hinge_radius`. The `corner` parameter should be 0, and `fudge` should be set to a small positive value. The `jump` parameter should be calculated based on `hinge_radius` and `gap`.

Could you generate the necessary OpenSCAD code, including the main file and any support functions? I'd appreciate it if you used descriptive module names.

[Assistant]
day353_hingesnap_tetrahedron.scad:
```
// mathgrrl hinge/snap tetrahedron

//////////////////////////////////////////////////////
// parameters

/* [Size] */

// Side length of the cube
length = 30;

// Width of the border edge
border = 3;

// Thickness of the side pieces (height when printing)
height = 3;

/* [Clearances] */

// Clearance between hinge cones and holes
clearance = .55;

// Clearance between hinge and sides
gap = .55;

// Clearance between snap tines
space = .55;

// Parameters that the user does not get to specify
$fn=24;
hinge_radius = height/2;
cone_height = 1.5*hinge_radius;
corner = 0*1;      	// space between hinge and corner
fudge = .01*1;			// to preserve mesh integrity
jump = 2*hinge_radius+2*gap;

//////////////////////////////////////////////////////
// renders

// center triangle
union(){
	poly_maker(sides=3);
	attach(type=2,side=1,sides=3);
	attach(type=2,side=2,sides=3);
	attach(type=1,side=3,sides=3);
}

// next triangle
translate([	(length/tan(180/3)+jump)*cos(180/3),
					(length/tan(180/3)+jump)*sin(180/3),
					0])
rotate(180/3,[0,0,1])
union(){
	poly_maker(sides=3);
	attach(type=2,side=2,sides=3);
	attach(type=1,side=3,sides=3);
}

// next next triangle
translate([	0,
					2*(length/tan(180/3)+jump)*sin(180/3),
					0])
rotate(2*180/3,[0,0,1])
union(){
	poly_maker(sides=3);
	attach(type=1,side=2,sides=3);
	attach(type=2,side=3,sides=3);
}

// next next next triangle
translate([	(length/tan(180/3)+jump)*cos(180/3),
					3*(length/tan(180/3)+jump)*sin(180/3),
					0])
rotate(3*180/3,[0,0,1])
union(){
	poly_maker(sides=3);
	attach(type=2,side=1,sides=3);
	attach(type=2,side=2,sides=3);
}

//////////////////////////////////////////////////////
// module for hinge

module hinge(){

	rad = hinge_radius;
	clr = clearance;
	len = (length-2*corner)/3;
	con = cone_height;

	rotate(90,[0,1,0]) rotate(-90,[1,0,0])
	translate([-rad,-rad-gap+fudge,0])
		union(){

			// left outside hinge = (cylinder+box)-cone
			difference(){
				union(){
					translate([0,0,corner]) cylinder(h=len-clr,r=rad);
					translate([-rad,0,corner]) cube([2*rad,rad+gap,len-clr]);
				}
				translate([0,0,corner+len-con-clr+fudge]) cylinder(h=con,r1=0,r2=rad);
			}

			// inside hinge = cylinder+box+cone+cone
			union(){
				translate([0,0,corner+len]) cylinder(h=len,r=rad);
				translate([-rad,-rad-gap,corner+len]) cube([2*rad,rad+gap,len]);
				translate([0,0,corner+len-con]) cylinder(h=con,r1=0,r2=rad);
				translate([0,0,corner+2*len]) cylinder(h=con,r1=rad,r2=0);
			}

			// right outside hinge = (cylinder+box)-cone
			difference(){
				union(){
					translate([0,0,corner+2*len+clr]) cylinder(h=len-clr,r=rad);
					translate([-rad,0,corner+2*len+clr]) cube([2*rad,rad+gap,len-clr]);
				}
				translate([0,0,corner+2*len+clr-fudge]) cylinder(h=con,r1=rad,r2=0);
			}

		}
}

//////////////////////////////////////////////////////
// module for snap

module snap(sides){

radius = length/(2*sin(180/sides));
snapwidth = radius*sin(180/sides)/3;

//build snaps for first side at the origin and move into positions
for(i=[0:2]){

	//for i^th snap translate 2*i snapwidths over from origin
	translate([0-fudge,2*i*snapwidth,0-fudge])

		//rounded box for snap made from a box and cylinder
		union(){

			//cube part of snap shape at the origin
			cube([height/2+gap+fudge,snapwidth-space+fudge,height+fudge]);

			//round part of snap shape at the origin
			//move cylinder to the end of the box
			translate([height/2+gap,snapwidth-space+fudge,height/2])

				//rotate cylinder to match box orientation
				rotate(90,[0,1,0])
					rotate(90,[1,0,0])

						//cylinder of the correct size to match box
						cylinder(
							r=height/2,
							h=snapwidth-space,
							$fn=16  //number of sides
						);
					}
			}

}

//////////////////////////////////////////////////////
// module for polygon shape
//shape is made up of n=sides wedges that are rotated around

module poly_maker(sides){

	radius = length/(2*sin(180/sides));
	inside = radius-border/(cos(180/sides));

	translate([0,0,height/2])

	//subtract the smaller polygon from the larger polygon
	difference(){

		//extrude to thicken the polygon
		linear_extrude(height=height,center=true){

			//rotate the wedge n=sides times at angle of 360/n each time
			for(i=[0:sides]){

				//rotation is around the z-axis [0,0,1]
				rotate(i*360/sides,[0,0,1])

					//make triangular wedge with angle based on number of sides
					polygon(

						//the three vertices of the triangle
						points = [[0-.05,0-.05], //tweaks fix CGAL errors
									 [radius,0-.01],
									 [radius*cos(360/sides)-.01,radius*sin(360/sides)+.01]],

						//the order to connect the three vertices above
						paths = [[0,1,2]]
					);
			}
		}
		//extrude to thicken the center polygon that will be the hole
		linear_extrude(height=height+2,center=true){

			//rotate the wedge n=sides times at angle of 360/n each time
			for(i=[0:sides]){

				//rotation is around the z-axis [0,0,1]
				rotate(i*360/sides,[0,0,1])

					//make triangular wedge with angle based on number of sides
					polygon(

						//the three vertices of the triangle
						points =	[[0-.1,0-.1], //tweaks fix CGAL errors
									 [inside,0-.01],
									 [inside*cos(360/sides)-.01,inside*sin(360/sides)+.01]],

						//the order to connect the three vertices above
						paths = [[0,1,2]]
					);
			}
		}
	}
}

//////////////////////////////////////////////////////
// module for attaching hinges or snaps to shape
// type=1 for hinges, type=2 for snaps

module attach(type,side,sides){

	radius = length/(2*sin(180/sides));

	//rotation is around the z-axis [0,0,1]
	rotate(side*360/sides,[0,0,1])

		//translate the attachment to the first side
		translate([radius,0,0+fudge])

			//rotate the attachment to correct angle for first side
			rotate(180/sides)

				union(){
					if (type==1) hinge();
					if (type==2) snap(sides);
				}

}
```