[User]
I need an OpenSCAD design for a motor mount, specifically for a tricopter. I've got some specific parameters I'd like to be able to adjust. The mount needs to have a plate for the motor, holes for mounting the motor, a tube section for attaching to an arm, and a way to attach a servo arm.

Here are the details:

**Motor Parameters:**

*   **Motor Diameter:** I need to be able to set the diameter of the motor itself.
*   **Motor Screw Hole Diameter:** The diameter of the screw holes for mounting the motor should be adjustable.
*   **Motor Screw Cap Diameter:** The diameter of the screw caps should also be adjustable.
*   **Motor Shaft Diameter:** Need to define the diameter of the motor shaft.
*  **Motor Hole Distances:** There are two distances between the mounting holes, one on the same axis, one on a rotated axis.
*   **Motor Angle:** The mounting holes should be rotatable around the center.

**Tube Parameters:**

*   **Tube Diameter:** The diameter of the tube that will attach to the arm should be settable.
*   **Tube Offset:**  The tube hole needs an offset from the center.
*   **Tube Wall Thickness:** The wall thickness around the tube hole.
*   **Tube Overlapping:**  The length of the tube hole section.

**Servo Parameters:**

*   **Servo Diameter:** The diameter of the servo arm mounting hole.
*   **Servo Offset:** The distance of the servo arm hole from the motor.
*   **Servo Wall Thickness:** The wall thickness around the servo arm hole.
*   **Servo Arm Length:**  The length of the servo arm, which affects the overall width of that section.
*   **Servo Length:** The length of the servo mounting hole.

**Global Parameters:**

*   **Screw Diameter Scale:** A global scale for the diameter of the screw holes.
*  **Tube Diameter Scale:** A global scale for the tube diameter.

I would like to be able to adjust all of these parameters. I'd like it to be a single .scad file, and I don't need any external libraries for this design.

[Assistant]
yaw_motor_mount_2.scad:
```
/* [Global] */
screw_diameter_scale = 1.1; //Global scale for screw diameter.
tube_diameter_scale = 1.1; //Global scale for tube diameter.

/* [Motor] */
motor_angle = 45; //Rotate motor screw holes around center.
motor_diameter = 28.0; //Motor diameter
motor_screw_diameter = 3.0; //Diameter of motor screw holes .
motor_screwcap_diameter = 6.0; //Diameter of motor screw caps.
motor_shaft_diameter = 8.0; //Motor shaft diameter.
motor_hole_dist_1 = 19.0; //Distance of motor holes.
motor_hole_dist_2 = 15.9; //Distance of motor holes.

/* [Tube] */
tube_diameter = 5.0; //Tube diameter
tube_offset = 2.0; //Increases the distance of the motor hole from the motor
tube_wall = 2.0; //Wall thickness around the tube hole.
tube_overlapping = 28; //Set the length of the tube hole.

/* [Servo] */
servo_diameter = 2.0; //Diameter of the hole to mount the servo arm.
servo_offset = 3.0; //Increases the distance of the hole to the motor.
servo_wall = 1.5; //Wall thickness around the hole.
servo_armlength = 30.0; //Servo arm length. This will change the width at the end where the servo mounting holes are.
servo_length = 5.0; //Length of the servo mounting hole.

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

yaw_mount();

module motor_holes(distance, radius = 1.5) {
	rotate ([0,0,90]) translate([distance / 2,0,0]) cylinder (h = 50, r=radius, center = true, $fn=100);
	mirror([0,1,0]) rotate ([0,0,90]) translate([distance/2,0,0]) cylinder (h = 50, r=radius, center = true, $fn=100);
 }

module motor_mount(radius) {
	motor_holes(motor_hole_dist_1, radius);
	rotate ([0,0,90]) motor_holes(motor_hole_dist_2, radius);
}

module motor_plate() {
	motor_r = motor_diameter / 2.0;
	tube_r = (tube_diameter / 2.0) * tube_diameter_scale;
	servo_r =  (servo_diameter / 2.0) * tube_diameter_scale;
	tubebox_pos = [0, tube_overlapping / 2, 0];
	box_extend = [servo_armlength / 2 - servo_r - servo_wall, motor_r , 2];
	difference() {
		union(){
			hull()
			{
				rotate ([0,0,90]) translate([0,0,0]) cylinder (h = 4, r = motor_r, center = true, $fn=100);
				translate(box_extend) tube_mount(servo_r, 5, 3, servo_wall);
				mirror() translate(box_extend) tube_mount(servo_r, 5, 3, servo_wall);
			}

			translate(box_extend) tube_mount(servo_r, servo_length, servo_offset, servo_wall);
			mirror() translate(box_extend) tube_mount(servo_r, servo_length,servo_offset, servo_wall);
			translate([0, motor_r, 2]) tube_mount(tube_r, tube_overlapping, tube_offset, tube_wall);
		}

		//holes
		translate([0, motor_r, 2]) tube_mount_hole(tube_r, motor_diameter, tube_offset, tube_wall);
		translate(box_extend) tube_mount_hole(servo_r, servo_length, servo_offset);
		mirror() translate(box_extend) tube_mount_hole(servo_r, servo_length, servo_offset);
	}
}

module tube_mount(radius, length, offset=1.0, wall_t=1.0) {
	cube_z = radius + wall_t + offset;
	union() {
   		translate([-1*(radius+wall_t), -length, -cube_z]) cube([2*(radius + wall_t), length, cube_z]);
		translate([0, -length/2, -cube_z]) rotate ([90,0,0]) cylinder (h = length, r=radius + wall_t, center = true, $fn=100);
	}
}

module tube_mount_hole(radius, length, offset=1.0, wall_t=1.0) {
	cube_z = radius + wall_t + offset;
	translate([0, -length/2, -cube_z]) rotate ([90,0,0]) cylinder (h = length + 1, r=radius, center = true, $fn=100);
}

module yaw_mount() {

	difference() {
		difference() {
   			motor_plate();

   			// motor mounting holes
	 		rotate ([0,0, motor_angle]) motor_mount((motor_screw_diameter  / 2) * screw_diameter_scale);
	 		//bottom
	 		translate([0,0, -27]) rotate ([0,0,motor_angle]) motor_mount((motor_screwcap_diameter / 2) * screw_diameter_scale);
		}

		// shaft cutout
		rotate ([0,0,0]) translate([0,0,0]) cylinder (h = 5, r=motor_shaft_diameter / 2, center = true, $fn=100);
	}
}

```


[User]
Hey, I need to design a cord toggle, you know, those little plastic things you use on the end of a drawstring? I've got a basic idea of the shape I want, but need it to be parametric so I can adjust it for different cords.

Basically, it's a sphere that's been hollowed out with a cone shape at one end to guide the cord in and a hole through the middle. The knot in the cord is supposed to catch on the small hole once it's inside the sphere. I want to be able to control the diameter of the sphere, the diameter of the cone opening, the height of the cone, and the diameter of the hole for the cord.

I think it'd be good if the cone opening wasn't totally sharp, maybe a small flat bit at the very end, so the cord can pass through without too much friction. Also, I'd prefer if the hole through the middle is a cylinder, and that it extends out past the sphere on both ends. The opening through the cone should smoothly transition to that cylindrical hole.

I'm not sure if this is even relevant but the material will be plastic, probably something like PLA or PETG. I’m hoping you can generate the code in OpenSCAD - I'm pretty comfortable with that. Let me know if you need more detail. Oh, and I'm not using any libraries, so just stick to base OpenSCAD if that’s okay.

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

dia = 25;
holeDia = 4;
coneDia = 20;
coneHeight = 27;

translate([0,0,dia/4])
	difference(){
		sphere(dia/2,$fn=72);
		holes();
	}

module holes () {
	union(){
		translate([0,0,-dia/2])
			cylinder(h=coneHeight,r1=coneDia/2,r2=0,$fn=72);
		translate([-dia/2,-dia/2,-dia*5/4])
			cube(dia);
		translate([0,0,-dia])
			cylinder(r=holeDia/2,h=dia*2,$fn=36);
	}
}
```


[User]
I'm looking to create a customizable lithophane cylinder, and I have a specific set of requirements in mind. I'd like to be able to import a height map image, and have that image wrapped around a cylinder, either on the inside or outside, creating an embossed effect. Here's a breakdown of what I need:

1.  **Cylinder Dimensions:** I need to be able to specify the desired height of the cylinder. The radius should be calculated automatically based on the image dimensions, with the width of the image taking up one half of the cylinder's circumference.

2.  **Embossing:** The image should be embossed either into or out of the cylinder surface, and I need to be able to specify the thickness of the embossed region. I also want to choose whether the embossing appears on the inside or the outside of the cylinder.

3.  **Image Input:** The design should take a height map image as input. I'll be providing the image as a data file, similar to what's generated by the Makerbot customizer tool, and also the image width and height.

4.  **Background:** I need a way to tell the design whether my image has a light or dark background. This is important for correctly creating the embossed region, ensuring that the non-image side of the embossed area blends seamlessly. It would be really helpful to provide a way to specify the background as a parameter, so I can toggle it.

5.  **Smooth Cylinder:** I want to ensure there are no holes, so a minimum layer of material should be present all around the cylinder. I need a way to specify that extrusion width.

6.  **Resolution:** I want the cylinder to be smooth, so I need a way to control the number of facets/steps in the cylinder's surface. It needs to be a higher enough number for the curve to be clean, but also not crash the program, so there should be a cap on the value. I need to make sure it's an odd number, too.

7.  **Library:** Could you please make use of the `BOSL2` library in the design?

I'd appreciate it if you could create the OpenSCAD files to handle these parameters. It might be useful to have a main file and maybe another file for the image import or surface generation, or whatever makes the most sense. I'm expecting a parametric design, so I can just change variables in the file, and the design will update accordingly.

[Assistant]
lithocylinder2.scad:
```
// preview[view:west, tilt:top]

// Desired height of cylinder. Image will scaled to fit in the height, with the radius set so that the width takes up one half of it.
cylinder_height = 60;

// Desired thickness of embossed region.
image_thickness = 2;

// Select "outside" to get the image on the outside of the cylinder.
direction = "inside"; // [inside, outside]

// Use http://customizer.makerbot.com/image_surface?image_x=81&image_y=61 to generate.
// Check invert colors if printing on the inside. Leave uninverted for the outside.
surface_file = "surface.dat"; // [image_surface:81x61]

// Select "light" if your (uninverted) image has a light background.
background = "dark"; // [dark, light]

// Need to leave one extrusion width all the way around so there will be no holes.
extrusion_width = 0.4;

// More gives higher resolution cylinder, but takes longer and may crash OpenSCAD. Use an odd number.
n_facets = 21;

/* [Hidden] */
// Change these if you are providing a larger than default surface file.
image_width = 81;
image_height = 61;

slop = 0.1;
surface_width = cylinder_height / image_height * image_width;
cylinder_r = surface_width / PI;
step_distance = surface_width / n_facets;
step_degree = 180 / n_facets;
$fn = n_facets * 2;

module emboss(step = 0) {
  difference() {
    if (step < n_facets) rotate([0, 0, -step_degree]) emboss(step + 1) child();
    else child();

    image_surface(step * step_distance);
  }
}

// We want the non-image side to meld into the image, so for dark backgrounds
// we cut in full black, and for light backgrounds cut in full white.
module backside_cutter() {
  difference() {
    cylinder(h=cylinder_height + 4*slop, r=cylinder_r + slop, center=true);

    if (background == "dark" && direction == "inside" || background == "light" && direction == "outside") cylinder(h=cylinder_height + 6*slop, r=cylinder_r - image_thickness - extrusion_width, center=true);
    else cylinder(h=cylinder_height + 6*slop, r=cylinder_r - extrusion_width, center=true);

    translate([-cylinder_r - 2*slop, -cylinder_r - 2*slop, -cylinder_height/2 - 3*slop])
    cube([cylinder_r + 2*slop, 2 * (cylinder_r + 2*slop), cylinder_height + 6*slop]);
  }
}

module blank() {
  difference() {
    cylinder(h=cylinder_height + 2*slop, r=cylinder_r, center=true);
    backside_cutter();
  }
}

module scaled_surface() {
  rotate([90, 0, 0])
  // Translate inward by extrusion width so there can be no holes for pure white.
  translate([0, 0, extrusion_width])
  scale([surface_width/(image_width - 1), (cylinder_height + 2*slop)/(image_height - 1), image_thickness])
  translate([image_width - 1, 0, 0])
  mirror([1, 0, 0])
  surface(file=surface_file, convexity = 5);
}

module image_surface(x) {
  translate([-x, cylinder_r * cos(step_degree/2), -cylinder_height/2 - slop]) scaled_surface();
}

if (direction == "outside") {
  intersection() {
    difference() {
      emboss() blank();
      cylinder(h=cylinder_height + 2*slop, r=cylinder_r - image_thickness - 2*extrusion_width, center=true);
    }
    cube([2*(cylinder_r + slop), 2*(cylinder_r + slop), cylinder_height], center=true);
  }
}
else {
  difference() {
    cylinder(h=cylinder_height, r=cylinder_r, center=true);
    emboss() blank();
  }
}

```


[User]
Hey, I'm looking to create a set of parametric Rokenbok-compatible beams. I've seen some designs out there, but I need something a bit more flexible.

Specifically, I want to be able to control:

*   **Beam Length:** The beam should be composed of a variable number of "blocks," each 20mm long. I need a parameter to set how many of these blocks are used.
*   **Snap Connectors:** The beams need to have the option of snap connectors on either one end or both ends (or no ends). I need to have a parameter that lets me specify 0, 1, or 2 snap connectors. I can provide a model for the snap itself.
*   **Snap Tolerance:** It’s important to adjust the tolerances of the male and female snap fit parts separately. I'd like to have parameters to adjust each independently.
*   **Print Supports:** I need an option to generate internal supports for the block structure itself. This will be for a single-extruder printer, so they need to be minimal and easy to remove. I need a boolean parameter for this, as well as a parameter to adjust their thickness.
*   **Fillets:** I want 0.5mm fillets on the edges of the beam

I'm not sure of the best way to approach this using OpenSCAD. Would you be able to help me write this? I think I need at least one .scad file for all of this.

[Assistant]
customizableRokenbokBeam.scad:
```
// length of beam
number_of_blocks = 4; // [1:17]

snaps = 1; // [0:No Snaps,1:One End,2:Both Ends]

/* [Advanced] */

// for single material printing
supports = 0; // [0:No Supports,1:Supports]

// increase if snap fits are too tight, decrease if snap fits are too loose. 0.3 suggested for MakerBot Replicator 2, 0.0 suggested for Shapeways
male_snap_fit_tolerance = 0;

// increase if snap fits are too tight, decrease if snap fits are too loose. 0.2 suggested for MakerBot Replicator 2, 0.0 suggested for Shapeways
female_snap_fit_tolerance = 0;

// 0.2 suggested for printing on MakerBot Replicator 2 with 0.2mm layer height
support_thickness = 0.2;

/* [Hidden] */

/*These designs are owned by Rokenbok Education and published under license by kid*spark, a nonprofit corporation, for nonprofit and educational uses. Drawings of these designs are licensed under Creative Commons Attribution-NonCommercial-ShareAlike (BY-NC-SA) 3.0: http://creativecommons.org/licenses/by-nc-sa/3.0/ The drawings may be freely downloaded, modified, and used, providing that attribution is given to Rokenbok Education and the drawings are for non-commercial purposes. Any modified drawings are licensed under the same terms. The drawings are intended for educational and hobby uses only; 3D prints of these designs should not be considered toys or for use by children without adult supervision. The drawings are not guaranteed to print perfectly.*/

WINDOW = 12+female_snap_fit_tolerance;
BLOCK_LENGTH = 20;
WALL = 2;

module block(origin = [0,0,0]) { // generate one block at origin
	translate(origin) {
		difference() {
		cube(size = BLOCK_LENGTH, center = true);
		cube(size = [BLOCK_LENGTH+1,WINDOW,WINDOW], center = true);
		cube(size = [WINDOW,BLOCK_LENGTH+1,WINDOW], center = true);
		cube(size = [WINDOW,WINDOW,BLOCK_LENGTH+1], center = true);
		cube(size = [BLOCK_LENGTH-2*WALL,BLOCK_LENGTH-2*WALL,BLOCK_LENGTH-2*WALL], center = true);
		translate([0,0,(BLOCK_LENGTH/2)])
			cube(size = [BLOCK_LENGTH+1,1,1], center = true);
		translate([0,0,-(BLOCK_LENGTH/2)])
			cube(size = [BLOCK_LENGTH+1,1,1], center = true);
		translate([0,-(BLOCK_LENGTH/2),0])
			cube(size = [BLOCK_LENGTH+1,1,1], center = true);
		translate([0,(BLOCK_LENGTH/2),0])
			cube(size = [BLOCK_LENGTH+1,1,1], center = true);
		translate([0,0,(BLOCK_LENGTH/2)])
			cube(size = [1,BLOCK_LENGTH+1,1], center = true);
		translate([0,0,-(BLOCK_LENGTH/2)])
			cube(size = [1,BLOCK_LENGTH+1,1], center = true);
		translate([0,-(BLOCK_LENGTH/2),0])
			cube(size = [1,1,BLOCK_LENGTH+1], center = true);
		translate([0,(BLOCK_LENGTH/2),0])
			cube(size = [1,1,BLOCK_LENGTH+1], center = true);
		} // end difference
		if (supports == 1) {
			translate([0,-(BLOCK_LENGTH+support_thickness-WALL)/2,0])
				cube([4,support_thickness,WINDOW], center = true);
			//translate([0,-(BLOCK_LENGTH/2-WALL+0.1),0])
			//	cube([4,support_thickness,WINDOW], center = true);
			translate([0,(BLOCK_LENGTH-support_thickness-WALL)/2,0])
				cube([4,support_thickness,WINDOW], center = true);
			//translate([0,(BLOCK_LENGTH/2-WALL+0.1),0])
			//	cube([4,support_thickness,WINDOW], center = true);
			translate([(4-support_thickness)/2,(WINDOW)/2+(BLOCK_LENGTH-WINDOW-WALL)/4,0])
				cube([support_thickness,(BLOCK_LENGTH-WINDOW-WALL)/2,WINDOW], center = true);
			mirror([1,0,0])
				translate([(4-support_thickness)/2,(WINDOW)/2+(BLOCK_LENGTH-WINDOW-WALL)/4,0])
					cube([support_thickness,(BLOCK_LENGTH-WINDOW-WALL)/2,WINDOW], center = true);
			mirror([0,1,0]) {
				translate([(4-support_thickness)/2,(WINDOW)/2+(BLOCK_LENGTH-WINDOW-WALL)/4,0])
					cube([support_thickness,(BLOCK_LENGTH-WINDOW-WALL)/2,WINDOW], center = true);
				mirror([1,0,0])
					translate([(4-support_thickness)/2,(WINDOW)/2+(BLOCK_LENGTH-WINDOW-WALL)/4,0])
						cube([support_thickness,(BLOCK_LENGTH-WINDOW-WALL)/2,WINDOW], center = true);
			} // end mirror
			difference() {
				cube([WINDOW+support_thickness,WINDOW+support_thickness,BLOCK_LENGTH-2*WALL], center = true);

				cube([WINDOW,WINDOW,BLOCK_LENGTH], center = true);
				cube([4,WINDOW+1,BLOCK_LENGTH-2*WALL], center = true);
				cube([WINDOW+1,4,BLOCK_LENGTH-2*WALL], center = true);
			} // end difference
			translate([WINDOW/2-(WINDOW-4)/4,WINDOW/2-(WINDOW-4)/4,(WINDOW+WALL)/2])
				rotate([0,0,45])	cube([support_thickness,sqrt(2)*(WINDOW-4)/2,(BLOCK_LENGTH-WINDOW)/2-WALL], center = true);
			mirror([1,0,0])
				translate([WINDOW/2-(WINDOW-4)/4,WINDOW/2-(WINDOW-4)/4,(WINDOW+WALL)/2])
					rotate([0,0,45])	cube([support_thickness,sqrt(2)*(WINDOW-4)/2,(BLOCK_LENGTH-WINDOW)/2-WALL], center = true);
			mirror([0,1,0]) {
				translate([WINDOW/2-(WINDOW-4)/4,WINDOW/2-(WINDOW-4)/4,(WINDOW+WALL)/2])
					rotate([0,0,45])	cube([support_thickness,sqrt(2)*(WINDOW-4)/2,(BLOCK_LENGTH-WINDOW)/2-WALL], center = true);
				mirror([1,0,0])
					translate([WINDOW/2-(WINDOW-4)/4,WINDOW/2-(WINDOW-4)/4,(WINDOW+WALL)/2])
						rotate([0,0,45])	cube([support_thickness,sqrt(2)*(WINDOW-4)/2,(BLOCK_LENGTH-WINDOW)/2-WALL], center = true);
			} // end mirror
			mirror([0,0,1]) {
				translate([WINDOW/2-(WINDOW-4)/4,WINDOW/2-(WINDOW-4)/4,(WINDOW+WALL)/2])
					rotate([0,0,45])	cube([support_thickness,sqrt(2)*(WINDOW-4)/2,(BLOCK_LENGTH-WINDOW)/2-WALL], center = true);
				mirror([1,0,0])
					translate([WINDOW/2-(WINDOW-4)/4,WINDOW/2-(WINDOW-4)/4,(WINDOW+WALL)/2])
						rotate([0,0,45])	cube([support_thickness,sqrt(2)*(WINDOW-4)/2,(BLOCK_LENGTH-WINDOW)/2-WALL], center = true);
				mirror([0,1,0]) {
					translate([WINDOW/2-(WINDOW-4)/4,WINDOW/2-(WINDOW-4)/4,(WINDOW+WALL)/2])
						rotate([0,0,45])	cube([support_thickness,sqrt(2)*(WINDOW-4)/2,(BLOCK_LENGTH-WINDOW)/2-WALL], center = true);
					mirror([1,0,0])
						translate([WINDOW/2-(WINDOW-4)/4,WINDOW/2-(WINDOW-4)/4,(WINDOW+WALL)/2])
							rotate([0,0,45])	cube([support_thickness,sqrt(2)*(WINDOW-4)/2,(BLOCK_LENGTH-WINDOW)/2-WALL], center = true);
				} // end mirror
			} // end mirror
		} // end if (supports != 0)
	} // end translate
} // end module block()

module snap(supports = 0, snap_fit_tolerance = 0.1, origin = [0,0,0], orientation = [0,0,0]) {
	translate(origin) rotate(orientation) difference() {
		union() {
			translate([-8.5-6.5/2,-(5.98-(1.5)/2),0])
				cube([6.5,1.5-snap_fit_tolerance,11.8], center = true);
			translate([-8.5-6.5+3.15/2,-5.98-0.8/2+snap_fit_tolerance/2,0])
				cube([5-1.95,0.8,11.8], center = true);
			translate([-(BLOCK_LENGTH/2)-1.53-(5-1.53)/2,-(5.98-1.5-0.75/2+snap_fit_tolerance/2),0])
				cube([5-1.53,0.75,11.8], center = true);
			// add fillets at attachment point
			translate([-8.5-0.5/2,-5.975+0.75,0]) {
				difference() {
					cube([0.5,1.5-snap_fit_tolerance+2*0.5,11.8+2*0.5], center = true);

						translate([-0.5/2,-1+snap_fit_tolerance/2-0.5/2,0])
							cylinder(h = 13, r = 0.5, $fs = 0.1, center = true);
						translate([-0.5/2,1-snap_fit_tolerance/2+0.5/2,0])
							cylinder(h = 13, r = 0.5, $fs = 0.1, center = true);
						translate([-0.5/2,0,11.8/2+0.5])
							rotate([90,0,0])
								cylinder(h = 3, r = 0.5, $fs = 0.1, center = true);
						translate([-0.5/2,0,-(11.8/2+0.5)])
							rotate([90,0,0])
								cylinder(h = 3, r = 0.5, $fs = 0.1, center = true);
				} // end difference fillet
			} // end translate
		} // end union
		// subtract 45 degree rotated "cubes"
		translate([-15,-6.78+snap_fit_tolerance/2,0])
			rotate([0,0,45])
				cube([2.54,2.54,12], center = true);
		translate([-11.95,-6.78+snap_fit_tolerance/2,0])
			rotate([0,0,45])
				cube([1.131371,1.131371,12], center = true);
		translate([-11.53,-3.73-snap_fit_tolerance/2,0])
			rotate([0,0,45])
				cube([1.06066,1.06066,12], center = true);
		translate([-14.714711,-3.444711-snap_fit_tolerance/2,0])
			rotate([0,0,30])
				cube([1.558846,1.558846,12], center = true);
		// subtract anti-fillet, doesn't work on polyhedra
		mirror([0,0,1]) {
			translate([-15+1.5,0,-5.9+1.5])
				difference() {
					cube([3.1,BLOCK_LENGTH,3.1], center = true);
					translate([1.5,0,1.5])
						rotate([90,0,0])
							cylinder(h = BLOCK_LENGTH+1, r = 3, $fs = 1, center = true);
				} // end difference
		} // end mirror
		translate([-15+1.5,0,-5.9+1.5])
			difference() {
				cube([3.1,BLOCK_LENGTH,3.1], center = true);
				translate([1.5,0,1.5])
					rotate([90,0,0])
						cylinder(h = BLOCK_LENGTH+1, r = 3, $fs=1, center = true);
			} // end difference
	} // end difference

	// supports
	if (supports != 0) {
		translate([-8.5-2.5,-(6-0.75),-5.9-4.1/2]) {
			difference() {
				cube([3.2,1.5-snap_fit_tolerance,4.1], center = true);
				translate([-support_thickness,0,3*0.2/2])
					cube([3,1.3-snap_fit_tolerance,4.1-3*0.2], center = true);
			} // end difference
		} // end translate
	} // end if (supports != 0)

	if (supports != 0)
		translate([-8.5-2.5,0,-5.9-4.1/2-4.1/2+3*0.2/2])
			cube([3.2,12-snap_fit_tolerance,3*0.2], center = true);
} // end module snap()

module filletX(rad = 0.5, length = 20, pos = [0,-(BLOCK_LENGTH/2),(BLOCK_LENGTH/2)], rot = [0,0,0]) {
	translate([pos[0],pos[1]-sign(pos[1])*rad/2,pos[2]-sign(pos[2])*rad/2])
		rotate(rot)
			rotate([0,0,90])
				difference() {
					cube([rad+.1,length+1,rad+.1], center = true);

					translate([rad/2,0,-rad/2])
						rotate([90,0,0])
							cylinder(r = rad, h = length+2, $fs = 0.1, center = true);
				} // end difference fillet
} // end module filletX()

module filletY(rad = 0.5, length = 20, pos = [-(BLOCK_LENGTH/2),0,(BLOCK_LENGTH/2)], rot = [0,0,0]) {
	translate([pos[0]-sign(pos[0])*rad/2,0,pos[2]-sign(pos[2])*rad/2])
		rotate(rot)
			difference() {
				cube([rad+.1,length+1,rad+.1], center = true);

				translate([rad/2,0,-rad/2])
					rotate([90,0,0])
						cylinder(r = rad, h = length+2, $fs = 0.1, center = true);
			} // end difference fillet
} // end module filletY()

module filletZ(rad = 0.5, length = 20, pos = [(BLOCK_LENGTH/2),-(BLOCK_LENGTH/2),0], rot = [0,0,90]) {
	translate([pos[0]-sign(pos[0])*rad/2,pos[1]-sign(pos[1])*rad/2],0)
		rotate(rot)
			rotate([90,0,0])
				difference() {
					cube([rad+.1,length+1,rad+.1], center = true);

					translate([rad/2,0,-rad/2])
						rotate([90,0,0])
							cylinder(r = rad, h = length+2, $fs = 0.1, center = true);
				} // end difference fillet
} // end module filletZ()

difference() {
	union() { // generate blocks
		for (i = [1:number_of_blocks]) {
			block([BLOCK_LENGTH*(i-1),0,0]);
		}
	}

	if (number_of_blocks > 1) {
		for (i = [2:number_of_blocks]) {
			translate([(BLOCK_LENGTH/2)+BLOCK_LENGTH*(i-2),0,0])
				difference() {
					cube([1,BLOCK_LENGTH+1,BLOCK_LENGTH+1], center = true);
					cube([1,19,19], center = true);
				}
		}
	} // end if number_of_blocks > 1

	if (snaps >= 1) {
		// near end snap
		translate([-(BLOCK_LENGTH/2),0,0])
			cube([3,BLOCK_LENGTH-2*WALL,BLOCK_LENGTH+1], center = true);

		if (snaps == 2) {
			// far end snap
			translate([number_of_blocks*BLOCK_LENGTH-(BLOCK_LENGTH/2),0,0])
				cube([3,BLOCK_LENGTH-2*WALL,BLOCK_LENGTH+1], center = true);
		} else {
			translate([number_of_blocks*BLOCK_LENGTH-(BLOCK_LENGTH/2),0,0]) {
				cube([1,BLOCK_LENGTH+1,1], center = true);
				cube([1,1,BLOCK_LENGTH+1], center = true);
			}
		}
	} else {
		translate([-(BLOCK_LENGTH/2),0,0]) {
			cube([1,BLOCK_LENGTH+1,1], center = true);
			cube([1,1,BLOCK_LENGTH+1], center = true);
		}
		translate([number_of_blocks*BLOCK_LENGTH-(BLOCK_LENGTH/2),0,0]) {
			cube([1,BLOCK_LENGTH+1,1], center = true);
			cube([1,1,BLOCK_LENGTH+1], center = true);
		}
	} // end if (snaps >= 1)

	// edge fillets 0.5mm radius
	filletX(rad = 0.5, length = number_of_blocks*BLOCK_LENGTH, pos = [(number_of_blocks-1)*(BLOCK_LENGTH/2),-(BLOCK_LENGTH/2),(BLOCK_LENGTH/2)], rot = [0,0,0]);
	filletX(rad = 0.5, length = number_of_blocks*BLOCK_LENGTH, pos = [(number_of_blocks-1)*(BLOCK_LENGTH/2),(BLOCK_LENGTH/2),(BLOCK_LENGTH/2)], rot = [-90,0,0]);
	filletX(rad = 0.5, length = number_of_blocks*BLOCK_LENGTH, pos = [(number_of_blocks-1)*(BLOCK_LENGTH/2),-(BLOCK_LENGTH/2),-(BLOCK_LENGTH/2)], rot = [90,0,0]);
	filletX(rad = 0.5, length = number_of_blocks*BLOCK_LENGTH, pos = [(number_of_blocks-1)*(BLOCK_LENGTH/2),(BLOCK_LENGTH/2),-(BLOCK_LENGTH/2)], rot = [180,0,0]);

	filletY(rad = 0.5, length = BLOCK_LENGTH, pos = [-(BLOCK_LENGTH/2),0,(BLOCK_LENGTH/2)], rot = [0,0,0]);
	filletY(rad = 0.5, length = BLOCK_LENGTH, pos = [-(BLOCK_LENGTH/2),0,-(BLOCK_LENGTH/2)], rot = [0,-90,0]);
	filletY(rad = 0.5, length = BLOCK_LENGTH, pos = [number_of_blocks*BLOCK_LENGTH-(BLOCK_LENGTH/2),0,(BLOCK_LENGTH/2)], rot = [0,90,0]);
	filletY(rad = 0.5, length = BLOCK_LENGTH, pos = [number_of_blocks*BLOCK_LENGTH-(BLOCK_LENGTH/2),0,-(BLOCK_LENGTH/2)], rot = [0,180,0]);

	filletZ(rad = 0.5, length = BLOCK_LENGTH, pos = [-(BLOCK_LENGTH/2),-(BLOCK_LENGTH/2),0], rot = [0,0,0]);
	filletZ(rad = 0.5, length = BLOCK_LENGTH, pos = [-(BLOCK_LENGTH/2),(BLOCK_LENGTH/2),0], rot = [0,0,-90]);
	filletZ(rad = 0.5, length = BLOCK_LENGTH, pos = [number_of_blocks*BLOCK_LENGTH-(BLOCK_LENGTH/2),-(BLOCK_LENGTH/2),0], rot = [0,0,90]);
	filletZ(rad = 0.5, length = BLOCK_LENGTH, pos = [number_of_blocks*BLOCK_LENGTH-(BLOCK_LENGTH/2),(BLOCK_LENGTH/2),0], rot = [0,0,180]);

} // end difference

if (snaps >= 1) {
	// near end snap
	translate([-7.75,0,0])
		difference() {
			cube([1.5,BLOCK_LENGTH-2*WALL,BLOCK_LENGTH-2*WALL], center = true);
			cube([WALL,3,12], center = true);
		} // end difference
	snap(supports, male_snap_fit_tolerance);
	mirror([0,1,0])
		snap(supports, male_snap_fit_tolerance);

	if (snaps == 2) {
		// far end snap
		translate([(number_of_blocks-1)*BLOCK_LENGTH+7.75,0,0])
			difference() {
				cube([1.5,BLOCK_LENGTH-2*WALL,BLOCK_LENGTH-2*WALL], center = true);
				cube([WALL,3,12], center = true);
			} // end difference
		translate([(number_of_blocks-1)*BLOCK_LENGTH,0,0])
			mirror([1,0,0]) {
				snap(supports, male_snap_fit_tolerance);
				mirror([0,1,0])
					snap(supports, male_snap_fit_tolerance);
			} // end mirror
	} else { // end if (snaps == 2)
		if (supports == 1) {
			translate([number_of_blocks*BLOCK_LENGTH-(BLOCK_LENGTH+support_thickness+WALL)/2,0,0])
				cube([support_thickness,4,WINDOW], center = true);
			//translate([number_of_blocks*BLOCK_LENGTH-12+0.1,0,0])
			//	cube([support_thickness,4,WINDOW], center = true);
			translate([(WINDOW)/2+(BLOCK_LENGTH-WINDOW-WALL)/4,(4-support_thickness)/2,0])
				cube([(BLOCK_LENGTH-WINDOW-WALL)/2,support_thickness,WINDOW], center = true);
			mirror([0,1,0])
				translate([(WINDOW)/2+(BLOCK_LENGTH-WINDOW-WALL)/4,(4-support_thickness)/2,0])
					cube([(BLOCK_LENGTH-WINDOW-WALL)/2,support_thickness,WINDOW], center = true);
		} // end if supports == 1
	} // end else if (snaps == 2)
} else { // end if (snaps >= 1)
	if (supports == 1) {
		translate([number_of_blocks*BLOCK_LENGTH-(BLOCK_LENGTH+support_thickness+WALL)/2,0,0])
			cube([support_thickness,4,WINDOW], center = true);
		//translate([number_of_blocks*BLOCK_LENGTH-12+0.1,0,0])
		//	cube([support_thickness,4,WINDOW], center = true);
		translate([-(BLOCK_LENGTH-support_thickness-WALL)/2,0,0])
			cube([support_thickness,4,WINDOW], center = true);
		//translate([-8-0.1,0,0])
		//	cube([support_thickness,4,WINDOW], center = true);
		translate([(WINDOW)/2+(BLOCK_LENGTH-WINDOW-WALL)/4,(4-support_thickness)/2,0])
				cube([(BLOCK_LENGTH-WINDOW-WALL)/2,support_thickness,WINDOW], center = true);
		mirror([0,1,0])
			translate([(WINDOW)/2+(BLOCK_LENGTH-WINDOW-WALL)/4,(4-support_thickness)/2,0])
				cube([(BLOCK_LENGTH-WINDOW-WALL)/2,support_thickness,WINDOW], center = true);
		mirror([1,0,0]) {
			translate([(WINDOW)/2+(BLOCK_LENGTH-WINDOW-WALL)/4,(4-support_thickness)/2,0])
				cube([(BLOCK_LENGTH-WINDOW-WALL)/2,support_thickness,WINDOW], center = true);
			mirror([0,1,0])
				translate([(WINDOW)/2+(BLOCK_LENGTH-WINDOW-WALL)/4,(4-support_thickness)/2,0])
					cube([(BLOCK_LENGTH-WINDOW-WALL)/2,support_thickness,WINDOW], center = true);
		} // end mirror
	} // end if supports == 1
} // end else if snaps >= 1
```


[User]
I'd like to design a set of customizable Rokenbok-compatible quarter circle beams. I need a few different options, specifically the diameter of the circle needs to be parametric in terms of Rokenbok block lengths. I'm thinking it should accept values like 5, 7, 9, 11, 13, 15, 17, and 19 blocks, though it doesn't need to be limited to just those.

Also, I'd like to have an option for snaps on the ends, specifically either no snaps, snaps on one side, or snaps on both sides.

Finally, for single-material 3D printing, I'd like to add optional built-in supports. I'd need to be able to customize the support wall thickness. There should also be tolerances to adjust how tight or loose the snap fits are.

I need an OpenSCAD file or set of files that can handle these parameters. I'm not looking to modify or improve the existing design, so you can assume you're designing it from scratch. And please, when creating the files, take advantage of any useful libraries - it might be helpful to use BOSL or BOSL2.

[Assistant]
customizableRokenbokQuarterCircleBeam.scad:
```
diameter_in_blocks = 5; //[5, 7, 9, 11, 13, 15, 17, 19]

snaps = 2; // [0:No Snaps,1:One Side,2:Both Sides]

/* [Advanced] */

// for single material printing
supports = 0; // [0:No Supports,1:Supports]

// thickness of support material wall. 0.2 suggested for MakerBot Replicator 2 at medium resolution (0.2mm layer height)
support_thickness = 0.2;

// increase if snap fits are too tight, decrease if snap fits are too loose. 0.3 suggested for MakerBot Replicator 2, 0.0 suggested for Shapeways
male_snap_fit_tolerance = 0;

// increase if snap fits are too tight, decrease if snap fits are too loose. 0.2 suggested for MakerBot Replicator 2, 0.0 suggested for Shapeways
female_snap_fit_tolerance = 0;

/* [Hidden] */

/*These designs are owned by Rokenbok Education and published under license by kid*spark, a nonprofit corporation, for nonprofit and educational uses. Drawings of these designs are licensed under Creative Commons Attribution-NonCommercial-ShareAlike (BY-NC-SA) 3.0: http://creativecommons.org/licenses/by-nc-sa/3.0/ The drawings may be freely downloaded, modified, and used, providing that attribution is given to Rokenbok Education and the drawings are for non-commercial purposes. Any modified drawings are licensed under the same terms. The drawings are intended for educational and hobby uses only; 3D prints of these designs should not be considered toys or for use by children without adult supervision. The drawings are not guaranteed to print perfectly.*/

index = (diameter_in_blocks-1)/2-2;

diameter = diameter_in_blocks;

BLOCK_LENGTH = 20;
WINDOW = 12+female_snap_fit_tolerance;
WALL = 2;

OR = BLOCK_LENGTH*sqrt( pow(diameter_in_blocks/2,2) + pow(1/2,2) );
IR = BLOCK_LENGTH*sqrt( pow(diameter_in_blocks/2 - 1,2) + pow(1/2,2) );
MR = BLOCK_LENGTH*(diameter_in_blocks-1)/2;
OD = 2*OR;
ID = 2*IR;
MD = 2*MR;

numInsideHoles = [1, 3, 4, 6, 7, 9, 10, 12];
numTopBottomHoles = numInsideHoles; // 9d is 5, 17d is 11
numOutsideHoles = [3, 4, 6, 7, 9, 10, 12, 14];
offsetInside = ( (90 - (numInsideHoles[index])/(IR/BLOCK_LENGTH)*(180/PI)) / 2);
offsetTopBottom = offsetInside;
offsetOutside = ( (90 - (numOutsideHoles[index])/(OR/BLOCK_LENGTH)*(180/PI)) / 2);

$fn = 100;

module snap(supports = 0, snap_fit_tolerance = 0.1, origin = [0,0,0], orientation = [0,0,0]) {
	translate(origin) rotate(orientation) difference() {
		union() {
			translate([-8.5-6.5/2,-(5.98-(1.5)/2),0])
				cube([6.5,1.5-snap_fit_tolerance,11.8], center = true);
			translate([-8.5-6.5+3.15/2,-5.98-0.8/2+snap_fit_tolerance/2,0])
				cube([5-1.95,0.8,11.8], center = true);
			translate([-(BLOCK_LENGTH/2)-1.53-(5-1.53)/2,-(5.98-1.5-0.75/2+snap_fit_tolerance/2),0])
				cube([5-1.53,0.75,11.8], center = true);
			// add fillets at attachment point
			translate([-8.5-0.5/2,-5.975+0.75,0]) {
				difference() {
					cube([0.5,1.5-snap_fit_tolerance+2*0.5,11.8+2*0.5], center = true);

						translate([-0.5/2,-1+snap_fit_tolerance/2-0.5/2,0])
							cylinder(h = 13, r = 0.5, $fs = 0.1, center = true);
						translate([-0.5/2,1-snap_fit_tolerance/2+0.5/2,0])
							cylinder(h = 13, r = 0.5, $fs = 0.1, center = true);
						translate([-0.5/2,0,11.8/2+0.5])
							rotate([90,0,0])
								cylinder(h = 3, r = 0.5, $fs = 0.1, center = true);
						translate([-0.5/2,0,-(11.8/2+0.5)])
							rotate([90,0,0])
								cylinder(h = 3, r = 0.5, $fs = 0.1, center = true);
				} // end difference fillet
			} // end translate
		} // end union
		// subtract 45 degree rotated "cubes"
		translate([-15,-6.78+snap_fit_tolerance/2,0])
			rotate([0,0,45])
				cube([2.54,2.54,12], center = true);
		translate([-11.95,-6.78+snap_fit_tolerance/2,0])
			rotate([0,0,45])
				cube([1.131371,1.131371,12], center = true);
		translate([-11.53,-3.73-snap_fit_tolerance/2,0])
			rotate([0,0,45])
				cube([1.06066,1.06066,12], center = true);
		translate([-14.714711,-3.444711-snap_fit_tolerance/2,0])
			rotate([0,0,30])
				cube([1.558846,1.558846,12], center = true);
		// subtract anti-fillet, doesn't work on polyhedra
		mirror([0,0,1]) {
			translate([-15+1.5,0,-5.9+1.5])
				difference() {
					cube([3.1,BLOCK_LENGTH,3.1], center = true);
					translate([1.5,0,1.5])
						rotate([90,0,0])
							cylinder(h = BLOCK_LENGTH+1, r = 3, $fs = 1, center = true);
				} // end difference
		} // end mirror
		translate([-15+1.5,0,-5.9+1.5])
			difference() {
				cube([3.1,BLOCK_LENGTH,3.1], center = true);
				translate([1.5,0,1.5])
					rotate([90,0,0])
						cylinder(h = BLOCK_LENGTH+1, r = 3, $fs=1, center = true);
			} // end difference
	} // end difference

	// supports
	if (supports == 1) {
		translate([-8.5-2.5,-(6-0.75),-5.9-4.1/2]) {
			difference() {
				cube([3.2,1.5-snap_fit_tolerance,4.1], center = true);
				translate([-0.2,0,3*0.2/2])
					cube([3,1.3-snap_fit_tolerance,4.1-3*0.2], center = true);
			} // end difference
		} // end translate
	} // end if (supports != 0)

	if (supports != 0)
		translate([-8.5-2.5,0,-5.9-4.1/2-4.1/2+3*0.2/2])
			cube([3.2,12-snap_fit_tolerance,3*0.2], center = true);
} // end module snap()

module filletX(rad = 0.5, length = BLOCK_LENGTH+4, pos = [MR,(BLOCK_LENGTH/2),(BLOCK_LENGTH/2)], rot = [0,0,0]) {
	translate([pos[0],pos[1]+sign(pos[1])*rad/2,pos[2]-sign(pos[2])*rad/2])
		rotate(rot)
			rotate([0,0,90])
				difference() {
					cube([rad+.1,length+1,rad+.1], center = true);

					translate([rad/2,0,-rad/2])
						rotate([90,0,0])
							cylinder(r = rad, h = length+2, $fs = 0.1, center = true);
				} // end difference fillet
} // end module filletX()

module filletZRO(filletRad = 0.5, rad = OR, height = BLOCK_LENGTH/2) {
	translate([0,0,height-filletRad])
		difference() {
			rotate_extrude(convexity=10)
				translate([rad-filletRad,0,0])
					square(filletRad+0.1,filletRad+0.1);
			rotate_extrude(convexity=10)
				translate([rad-filletRad,0,0])
					circle(r=filletRad);
		} // end difference
} // end module filletZR()

module filletZRI(filletRad = 0.5, rad = IR, height = BLOCK_LENGTH/2) {
	translate([0,0,height-filletRad])
		difference() {
			rotate_extrude(convexity=10)
				translate([rad,0,0])
					square(filletRad+0.1,filletRad+0.1);
			rotate_extrude(convexity=10)
				translate([rad+filletRad,0,0])
					circle(r=filletRad);
		} // end difference
} // end module filletZR()

difference() {
	union() {
		difference() {
			union() {
				translate([MR,BLOCK_LENGTH/2+1,0])
					cube([BLOCK_LENGTH-1,2,BLOCK_LENGTH-1], center = true);
				translate([BLOCK_LENGTH/2+1,MR,0])
					cube([2,BLOCK_LENGTH-1,BLOCK_LENGTH-1], center = true);
			} // end union

			difference() {
				cylinder(h = BLOCK_LENGTH, d = OD+10, center = true);
				cylinder(h = BLOCK_LENGTH+1, d = OD, center = true);
			} // end difference
		} // end difference

		difference() {
			cylinder(h = BLOCK_LENGTH, d = OD, center = true);

			cylinder(h = BLOCK_LENGTH+1, d = ID, center = true);
			difference() {
				cylinder(h = BLOCK_LENGTH-2*WALL, d = OD-2*WALL, center = true);

				cylinder(h = BLOCK_LENGTH-2*WALL, d = ID+2*WALL, center = true);
			} // end difference
			translate([-OR/2,0,0])
				cube([BLOCK_LENGTH+OR,OD,BLOCK_LENGTH+1], center = true);
			translate([OR/2,-OR/2,0])
				cube([OR,BLOCK_LENGTH+OR,BLOCK_LENGTH+1], center = true);

			for (i = [1:numTopBottomHoles[index]]) {
				rotate(a = [0,0,offsetTopBottom+((90-2*offsetTopBottom)/(numTopBottomHoles[index]))*(i-0.5)])
					translate([MR,0,0])
						cube([WINDOW,WINDOW,BLOCK_LENGTH+1], center = true);
			} // end for loop

			for (i = [1:numInsideHoles[index]]) {
				rotate(a = [0,0,offsetInside+((90-2*offsetInside)/(numInsideHoles[index]))*(i-0.5)])
					translate([IR,0,0])
						cube([BLOCK_LENGTH,WINDOW,WINDOW], center = true);
			} // end for loop

			for (i = [1:numOutsideHoles[index]]) {
				rotate(a = [0,0,offsetOutside+((90-2*offsetOutside)/(numOutsideHoles[index]))*(i-0.5)])
					translate([OR,0,0])
						cube([BLOCK_LENGTH,WINDOW,WINDOW], center = true);
			} // end for loop */

			// 0.5mm cut-outs
			cylinder(h = 1, d = ID+1, center = true);
			difference() {
				cylinder(h = 1, d = OD+1, center = true);
				cylinder(h = 1, d = OD-1, center = true);
			} // end difference
			translate([0,0,BLOCK_LENGTH/2])
				difference() {
					cylinder(h = 1, d = MD+2, center = true);
					cylinder(h = 1, d = MD, center = true);
				} // end difference
			translate([0,0,-BLOCK_LENGTH/2])
				difference() {
					cylinder(h = 1, d = MD+2, center = true);
					cylinder(h = 1, d = MD, center = true);
				} // end difference

			for (i = [1:numInsideHoles[index]]) {
				rotate(a = [0,0,offsetInside+((90-2*offsetInside)/(numInsideHoles[index]))*(i-0.5)])
					translate([IR,0,0])
						cube([1,1,BLOCK_LENGTH+1], center = true);
			} // end for loop
			for (i = [2:numInsideHoles[index]]) {
				rotate(a = [0,0,offsetInside+((90-2*offsetInside)/(numInsideHoles[index]))*(i-1)])
					translate([IR,0,0])
						cube([1,1,BLOCK_LENGTH+1], center = true);
			} // end for loop

			for (i = [1:numTopBottomHoles[index]]) {
				rotate(a = [0,0,offsetTopBottom+((90-2*offsetTopBottom)/(numTopBottomHoles[index]))*(i-0.5)]) {
					translate([MR,0,BLOCK_LENGTH/2])
						cube([BLOCK_LENGTH+1,1,1], center = true);
					translate([MR,0,-BLOCK_LENGTH/2])
						cube([BLOCK_LENGTH+1,1,1], center = true);
				} // end rotate
			} // end for loop
			for (i = [2:numTopBottomHoles[index]]) {
				rotate(a = [0,0,offsetTopBottom+((90-2*offsetTopBottom)/(numTopBottomHoles[index]))*(i-1)]) {
					translate([MR,0,BLOCK_LENGTH/2])
						cube([BLOCK_LENGTH+1,1,1], center = true);
					translate([MR,0,-BLOCK_LENGTH/2])
						cube([BLOCK_LENGTH+1,1,1], center = true);
				} // end rotate
			} // end for loop

			for (i = [1:numOutsideHoles[index]]) {
				rotate(a = [0,0,offsetOutside+((90-2*offsetOutside)/(numOutsideHoles[index]))*(i-0.5)])
					translate([OR,0,0])
						cube([1,1,BLOCK_LENGTH+1], center = true);
			} // end for loop
			for (i = [2:numOutsideHoles[index]]) {
				rotate(a = [0,0,offsetOutside+((90-2*offsetOutside)/(numOutsideHoles[index]))*(i-1)])
					translate([OR,0,0])
						cube([1,1,BLOCK_LENGTH+1], center = true);
			} // end for loop*/

		} // end difference
	} // end union

	if (snaps >= 1) {
		// x-axis end snap
		translate([MR,BLOCK_LENGTH/2,0]) {
			cube([BLOCK_LENGTH-2*WALL,3,BLOCK_LENGTH+1], center = true);
			cube([3,10,12], center = true);
		} // end translate

		if (snaps == 2) {
			// y-axis end snap
			translate([BLOCK_LENGTH/2,MR,0]) {
				cube([3,BLOCK_LENGTH-2*WALL,BLOCK_LENGTH+1], center = true);
				cube([10,3,12], center = true);
			}
		} else {
			translate([BLOCK_LENGTH/2,MR,0]) {
				cube([1,BLOCK_LENGTH+1,1], center = true);
				cube([1,1,BLOCK_LENGTH+1], center = true);
				cube([6,12,12], center = true);
			}
		}
	} else {
		translate([MR,BLOCK_LENGTH/2,0]) {
			cube([BLOCK_LENGTH+1,1,1], center = true);
			cube([1,1,BLOCK_LENGTH+1], center = true);
			cube([12,6,12], center = true);
		}
		translate([BLOCK_LENGTH/2,MR,0]) {
			cube([1,21,1], center = true);
			cube([1,1,21], center = true);
			cube([6,12,12], center = true);
		}
	} // end if (snaps >- 1)

filletX(rad = 0.5, length = BLOCK_LENGTH+4, pos = [MR,(BLOCK_LENGTH/2),(BLOCK_LENGTH/2)], rot = [0,0,0]);
mirror([0,0,1])
	filletX(rad = 0.5, length = BLOCK_LENGTH+4, pos = [MR,(BLOCK_LENGTH/2),(BLOCK_LENGTH/2)], rot = [0,0,0]);
mirror([1,-1,0]) {
	filletX(rad = 0.5, length = BLOCK_LENGTH+4, pos = [MR,(BLOCK_LENGTH/2),(BLOCK_LENGTH/2)], rot = [0,0,0]);
	mirror([0,0,1])
		filletX(rad = 0.5, length = BLOCK_LENGTH+4, pos = [MR,(BLOCK_LENGTH/2),(BLOCK_LENGTH/2)], rot = [0,0,0]);
} // end mirror

filletZRO(filletRad = 0.5, rad = OR, height = BLOCK_LENGTH/2);
mirror([0,0,1])
	filletZRO(filletRad = 0.5, rad = OR, height = BLOCK_LENGTH/2);
filletZRI(filletRad = 0.5, rad = IR, height = BLOCK_LENGTH/2);
mirror([0,0,1])
	filletZRI(filletRad = 0.5, rad = IR, height = BLOCK_LENGTH/2);

} // end difference

if (snaps >= 1) { // x snap
	translate([MR,BLOCK_LENGTH-7.75,0])
		difference() {
			cube([BLOCK_LENGTH-2*WALL,1.5,BLOCK_LENGTH-2*WALL], center = true);
			cube([WALL,3,12], center = true);
		} // end difference
	translate([MR,BLOCK_LENGTH,0])
		rotate([0,0,90]) {
			snap(supports, male_snap_fit_tolerance);
			mirror([0,1,0]) snap(supports, male_snap_fit_tolerance);
		} // end rotate

	if (snaps == 2) { // y snap
		translate([BLOCK_LENGTH-7.75,MR,0])
			difference() {
				cube([1.5,BLOCK_LENGTH-2*WALL,BLOCK_LENGTH-2*WALL], center = true);
				cube([3,WALL,12], center = true);
			} // end difference
		translate([BLOCK_LENGTH,MR,0]) {
			snap(supports, male_snap_fit_tolerance);
			mirror([0,1,0]) snap(supports, male_snap_fit_tolerance);
		} // end translate

	} else { // end if snaps == 2
		if (supports == 1) {
			translate([(BLOCK_LENGTH+support_thickness+WALL)/2,MR,0])
				cube([support_thickness,4,WINDOW], center = true);
		} // end if supports == 1
	} // end else
} else { // end if snaps >= 1
	if (supports == 1) {
		translate([MR,(BLOCK_LENGTH+support_thickness+WALL)/2,0])
			cube([4,support_thickness,WINDOW], center = true);

		translate([(BLOCK_LENGTH+support_thickness+WALL)/2,MR,0])
			cube([support_thickness,4,WINDOW], center = true);
	} // end if supports == 1
} // end else

if (supports == 1) {
	for (i = [1:numTopBottomHoles[index]]) {
		rotate(a = [0,0,offsetTopBottom+((90-2*offsetTopBottom)/(numTopBottomHoles[index]))*(i-0.5)]) {
			translate([MR,0,0])
				difference() {
					cube([WINDOW+2*support_thickness,WINDOW+2*support_thickness,BLOCK_LENGTH], center = true);
					cube([WINDOW,WINDOW,BLOCK_LENGTH+1], center = true);
					cube([WINDOW+2*support_thickness+.1,4,BLOCK_LENGTH-2*WALL], center = true);
					cube([4,WINDOW+2*support_thickness+.1,BLOCK_LENGTH-2*WALL], center = true);
				} // end difference

		translate([MR+(WINDOW/2-(WINDOW-4)/4),WINDOW/2-(WINDOW-4)/4,0])
			rotate([0,0,45])	cube([support_thickness,sqrt(2)*(WINDOW-4)/2,BLOCK_LENGTH-2*WALL], center = true);
		mirror([0,1,0])
			translate([MR+(WINDOW/2-(WINDOW-4)/4),WINDOW/2-(WINDOW-4)/4,0])
				rotate([0,0,45])	cube([support_thickness,sqrt(2)*(WINDOW-4)/2,BLOCK_LENGTH-2*WALL], center = true);

		translate([MR-(WINDOW/2-(WINDOW-4)/4),WINDOW/2-(WINDOW-4)/4,(WINDOW+WALL)/2])
			rotate([0,0,-45])	cube([support_thickness,sqrt(2)*(WINDOW-4)/2,(BLOCK_LENGTH-WINDOW)/2-WALL], center = true);
		mirror([0,1,0])
			translate([MR-(WINDOW/2-(WINDOW-4)/4),WINDOW/2-(WINDOW-4)/4,(WINDOW+WALL)/2])
				rotate([0,0,-45])	cube([support_thickness,sqrt(2)*(WINDOW-4)/2,(BLOCK_LENGTH-WINDOW)/2-WALL], center = true);
		mirror([0,0,1]) {
			translate([MR-(WINDOW/2-(WINDOW-4)/4),WINDOW/2-(WINDOW-4)/4,(WINDOW+WALL)/2])
				rotate([0,0,-45])	cube([support_thickness,sqrt(2)*(WINDOW-4)/2,(BLOCK_LENGTH-WINDOW)/2-WALL], center = true);
			mirror([0,1,0])
				translate([MR-(WINDOW/2-(WINDOW-4)/4),WINDOW/2-(WINDOW-4)/4,(WINDOW+WALL)/2])
					rotate([0,0,-45])	cube([support_thickness,sqrt(2)*(WINDOW-4)/2,(BLOCK_LENGTH-WINDOW)/2-WALL], center = true);
		} // end mirror

		} // end rotate
	} // end for loop

	for (i = [1:numInsideHoles[index]]) {
		rotate(a = [0,0,offsetInside+((90-2*offsetInside)/(numInsideHoles[index]))*(i-0.5)]) {
			difference() {
				rotate_extrude(convexity=10, angle=10)
					translate([IR+support_thickness/2+WALL/2,0,0])
						square([support_thickness,WINDOW], center = true);

				translate([0,-(OR+1)/2-2,0])
					cube([OD+1,OR+1,WINDOW+1], center = true);
				translate([0,(OR+1)/2+2,0])
					cube([OD+1,OR+1,WINDOW+1], center = true);
				translate([-OR,0,0])
					cube([OR+1,OR+1,WINDOW+1], center = true);
			} // end difference

			translate([IR-BLOCK_LENGTH/4+(WINDOW)/2+(MR-IR-WINDOW/2-WALL/2)/2,(4-support_thickness)/2,0])
				cube([MR-IR-WINDOW/2-WALL/2,support_thickness,WINDOW], center = true);
			mirror([0,1,0])
				translate([IR-BLOCK_LENGTH/4+(WINDOW)/2+(MR-IR-WINDOW/2-WALL/2)/2,(4-support_thickness)/2,0])
					cube([MR-IR-WINDOW/2-WALL/2,support_thickness,WINDOW], center = true);

		} // end rotate
	} // end for loop

	for (i = [1:numOutsideHoles[index]]) {
		rotate(a = [0,0,offsetOutside+((90-2*offsetOutside)/(numOutsideHoles[index]))*(i-0.5)]) {
			difference() {
				rotate_extrude(convexity=10, angle=10)
					translate([OR-support_thickness/2-WALL/2,0,0])
						square([support_thickness,WINDOW], center = true);

				translate([0,-(OR+1)/2-2,0])
					cube([OD+1,OR+1,WINDOW+1], center = true);
				translate([0,(OR+1)/2+2,0])
					cube([OD+1,OR+1,WINDOW+1], center = true);
				translate([-OR,0,0])
					cube([OR+1,OR+1,WINDOW+1], center = true);
			} // end difference

		} // end rotate
	} // end for loop

	if ((diameter_in_blocks != 7) && (diameter_in_blocks != 11) && (diameter_in_blocks != 15)) {
		rotate(a = [0,0,offsetTopBottom]) translate([MR,0,0])
			cube([12,support_thickness,BLOCK_LENGTH-2], center = true);
		rotate(a = [0,0,90-offsetTopBottom]) translate([MR,0,0])
			cube([12,support_thickness,BLOCK_LENGTH-2], center = true);
	} // end if

} // end if supports == 1
```


[User]
Hi, I'm looking for a parametric OpenSCAD design for an Arduino mount that's compatible with Rokenbok building blocks. I have a basic understanding of OpenSCAD but would prefer to have a design with good parametric control.

Specifically, I'd like to be able to choose whether the Arduino is secured to the mount using printed plastic pins or screw holes. I need parameters to adjust the height and diameter of the mounting posts, the diameter of the screw holes, and the diameter of the printed pins. Also, a tolerance parameter for the snap fit if I use the pins would be great, so it's easier to customize for different printers and materials.

The mount should have the general dimensions and Rokenbok-compatible window cutouts as seen in the example file I've included. I would like for the mount to have rounded edges and corners - I've used the `filletX`, `filletY`, and `filletZ` modules to achieve this in the example.

Here's a breakdown of the parameters I would like control over:

*   `mounting_points`: A selection between "Pins" and "Screw holes" to choose the mounting method.
*   `mounting_post_height`: Height of the mounting posts.
*   `mounting_post_diameter`: Diameter of the mounting posts.
*   `screw_hole_diameter`: Diameter of the screw holes.
*   `pin_diameter`: Diameter of the printed pins.
*   `female_snap_fit_tolerance`: Tolerance for the snap fit when using pins.
*  `BLOCK_LENGTH`: Length of one Rokenbok block unit
*  `WALL`: Thickness of the Rokenbok mount
*  `fillet_radius`: Radius of the rounded corners

I would also need the file to be well-commented, as I may need to make adjustments later on. I'm not sure if these modules are in a standard library, but I did create `filletX`, `filletY`, and `filletZ` modules to make rounded corners. If there are better ways to do this I'm open to suggestions!

Could you create that for me? Thanks!

[Assistant]
arduinoRokenbokMount.scad:
```
// how Arduino connects to board, choose printed plastic pins or screw holes
mounting_points = 0; // [0:Pins,1:Screw holes]

// in mm
mounting_post_height = 6;

// in mm
mounting_post_diameter = 6.4;

// in mm
screw_hole_diameter = 3.2;

// in mm, 2.9 suggested for MakerBot Replicator 2 at 0.2mm layer height
pin_diameter = 2.9;

// increase if snap fits are too tight, decrease if snap fits are too loose. 0.2 suggested for MakerBot Replicator 2, 0.0 suggested for Shapeways
female_snap_fit_tolerance = 0;

/* [Hidden] */

/*These designs are owned by Rokenbok Education and published under license by kid*spark, a nonprofit corporation, for nonprofit and educational uses. Drawings of these designs are licensed under Creative Commons Attribution-NonCommercial-ShareAlike (BY-NC-SA) 3.0: http://creativecommons.org/licenses/by-nc-sa/3.0/ The drawings may be freely downloaded, modified, and used, providing that attribution is given to Rokenbok Education and the drawings are for non-commercial purposes. Any modified drawings are licensed under the same terms. The drawings are intended for educational and hobby uses only; 3D prints of these designs should not be considered toys or for use by children without adult supervision. The drawings are not guaranteed to print perfectly.*/

$fn = 50;
WINDOW = 12+female_snap_fit_tolerance;
BLOCK_LENGTH = 20;
WALL = 2;

module mountingPost(origin = [0,0,0]) {
	translate(origin)
		difference() {
			union() {
				cylinder(h = mounting_post_height+0.5, d = mounting_post_diameter);
				if (mounting_points == 0) {
					translate([0,0,mounting_post_height])
						cylinder(h = 3, d = pin_diameter);
				} // end if mounting_points == 1
			} // end union

			if (mounting_points == 1) {
				cylinder(h = mounting_post_height+1, d = screw_hole_diameter);
			} // end if mounting_points == 1
		} // end difference
} // end module mountingPost

module filletX(rad = 0.5, length = 4*BLOCK_LENGTH, pos = [0,-(3*BLOCK_LENGTH/2),(WALL/2)], rot = [0,0,0]) {
	translate([pos[0],pos[1]-sign(pos[1])*rad/2,pos[2]-sign(pos[2])*rad/2])
		rotate(rot)
			rotate([0,0,90])
				difference() {
					cube([rad+.1,length+1,rad+.1], center = true);

					translate([rad/2,0,-rad/2])
						rotate([90,0,0])
							cylinder(r = rad, h = length+2, $fs = 0.1, center = true);
				} // end difference fillet
} // end module filletX()

module filletY(rad = 0.5, length = 3*BLOCK_LENGTH, pos = [-(4*BLOCK_LENGTH/2),0,WALL/2], rot = [0,0,0]) {
	translate([pos[0]-sign(pos[0])*rad/2,0,pos[2]-sign(pos[2])*rad/2])
		rotate(rot)
			difference() {
				cube([rad+.1,length+1,rad+.1], center = true);

				translate([rad/2,0,-rad/2])
					rotate([90,0,0])
						cylinder(r = rad, h = length+2, $fs = 0.1, center = true);
			} // end difference fillet
} // end module filletY()

module filletZ(rad = 0.5, length = WALL, pos = [(4*BLOCK_LENGTH/2),-(3*BLOCK_LENGTH/2),0], rot = [0,0,90]) {
	translate([pos[0]-sign(pos[0])*rad/2,pos[1]-sign(pos[1])*rad/2],0)
		rotate(rot)
			rotate([90,0,0])
				difference() {
					cube([rad+.1,length+1,rad+.1], center = true);

					translate([rad/2,0,-rad/2])
						rotate([90,0,0])
							cylinder(r = rad, h = length+2, $fs = 0.1, center = true);
				} // end difference fillet
} // end module filletZ()

difference() {
	cube([4*BLOCK_LENGTH,3*BLOCK_LENGTH,WALL], center = true);

	translate([-2*BLOCK_LENGTH,-1.5*BLOCK_LENGTH,0])
		for (i = [1:3]) {
			for (j = [1:2]) {
				translate([i*BLOCK_LENGTH,j*BLOCK_LENGTH,0])
					cube([WINDOW,WINDOW,WALL+1], center = true);
			} // end for j
		} // end for i

	for (i = [1:7]) {
		translate([i*BLOCK_LENGTH/2-2*BLOCK_LENGTH,0,0]) {
			translate([0,0,WALL/2])
				cube([1,3*BLOCK_LENGTH+1,1], center = true);
			translate([0,0,-WALL/2])
				cube([1,3*BLOCK_LENGTH+1,1], center = true);
		} // end translate
	} // end for i

	for (i = [1:5]) {
		translate([0,i*BLOCK_LENGTH/2-1.5*BLOCK_LENGTH,0]) {
			translate([0,0,WALL/2])
				cube([4*BLOCK_LENGTH+1,1,1], center = true);
			translate([0,0,-WALL/2])
				cube([4*BLOCK_LENGTH+1,1,1], center = true);
		} // end translate
	} // end for i

	filletX();
	mirror([0,0,1]) filletX();
	mirror([0,1,0]) filletX();
	mirror([0,1,0]) mirror([0,0,1]) filletX();

	filletY();
	mirror([0,0,1]) filletY();
	mirror([1,0,0]) filletY();
	mirror([1,0,0]) mirror([0,0,1]) filletY();

	filletZ();
	mirror([0,1,0]) filletZ();
	mirror([1,0,0]) filletZ();
	mirror([1,0,0]) mirror([0,1,0]) filletZ();

} // end difference

mountingPost([-0.75*25.4,0.95*25.4,WALL/2]);
mountingPost([-0.8*25.4,-0.95*25.4,WALL/2-0.5]);
mountingPost([1.25*25.4,-0.75*25.4,WALL/2-0.5]);
mountingPost([1.25*25.4,0.35*25.4,WALL/2-0.5]);
```


[User]
Hi, I'm looking to design a phone cradle for use with RAM mount hardware. I want it to consist of two interlocking clips: a vertical clip that holds the phone along its height and a horizontal clip that secures the phone across its width. The horizontal clip should be sandwiched between the vertical clip and the RAM mount itself. I'd also like to be able to customize the cutouts for specific phones, like the power button, flash, and charging port. And finally, I want to have some flexible cutouts on the vertical clip to make inserting and removing the phone easier.

So, to summarize, here are the key features I need:

*   **Two-piece design:** A vertical clip and a horizontal clip.
*   **Interlocking clips:** The horizontal clip should slot into the vertical one.
*   **Horizontal clip position:** The horizontal clip should sit *behind* the vertical clip when viewing the front of the phone, against the mounting plate.
*   **RAM mount compatibility:** Bolt holes should be included on the vertical clip with adjustable spacing and diameter.
*   **Customizable cutouts:** I should be able to specify the shape and position of cutouts for things like buttons and ports on the phone.
*   **Flexible cutouts:** The vertical clip needs flexible cutouts to make it easier to insert and remove the phone. These should be adjustable in size, position, and number.
*   **Parametric:** Everything should be adjustable. Phone dimensions, clip thickness, hole size, and the position of features.
*   I would like all of the dimensions to be in millimeters.
*   I would like to be able to select which piece to display. I want to be able to view the vertical, horizontal, or both pieces in isolation.
*   I would like to use the `hull()` function to generate the main body of each clip.

I'm not particular about which libraries to use, but I am familiar with the `MCAD` library so that may be a place to start. I am comfortable with OpenSCAD, but would prefer for you to supply all of the code without me having to create any of the functions or modules myself.

[Assistant]
ramphoneclip.scad:
```
// Customizable RAM Mount Phone Clip

/* [Options] */

// Select which part to display.
part = "both"; // [horizontal:Horizontal Clip, vertical:Vertical Clip, both:Complete Assembly]

// Cutouts for iPhone 5c sleep button, flash, and power connector. Assumes default dimensions.
iphone_tweaks = 1; // [0:Disabled, 1:Enabled]

// Wavy cutouts in vertical clip to increase flexibility for insertion and removal. Assumes default dimensions.
flex_ridges = 1; // [0:Disabled, 1:Enabled]

/* [Phone] */

// Controls size of horizontal clip. (mm)
phone_width = 60;

// Controls size of vertical clip. (mm)
phone_height = 125;

// Phone thickness; controls size of arms on both clips. (mm)
phone_depth = 9;

/* [Clips] */

// Minimum thickness of clips. Clips are twice as thick where they cross. (mm)
clip_thickness = 4;

// Clip height, as oriented for printing. (mm)
clip_width = 20;

// Size of grips on front face of phone. Top grip is rounded to ease phone insertion and removal. (mm)
grip_width = 3;

// Enable grips on horizontal cross clip. This holds the phone more securely but makes insertion and removal more difficult.
cross_grips = 0; // [0:Disabled, 1:Enabled]

// Location of horizontal cross clip relative to center of vertical clip. Also controls location of mounting holes. (mm)
cross_offset = -10;

// Sandwich horizontal cross clip between vertical clip and which object?
cross_side = 1; // [0:Phone, 1:Mounting Bracket]

// Fudge factor added to size of assembly notches on each clip. (mm)
cross_tolerance = 0.5;

/* [Mount] */

// Spacing between center of mounting holes. Holes are centered where clips cross. (mm)
bolt_spacing = 48;

// Diameter of bolt holes. (mm)
bolt_diameter = 4.8;

// Diameter of recess for bolt heads. (mm)
head_diameter = 10;

/* [Hidden] */

bolt_radius = bolt_diameter/2;
head_radius = head_diameter/2;
bolt_offset = bolt_spacing/2;
$fn = 30;

SelectPart();

module SelectPart() {
	if (part == "horizontal") {
		translate([0, 0, clip_width/2-cross_offset])
		HorizontalClip();
	}
	else if (part == "vertical") {
		translate([0, 0, clip_width/2])
		rotate([0, -90, 0])
		VerticalClip();
	}
	else {
		VerticalClip();
		HorizontalClip();
	}
}

function hnotch_depth(side) = (side == 0 ? clip_thickness*2 - cross_tolerance : cross_tolerance);
function vnotch_depth(side) = (side == 0 ? cross_tolerance : clip_thickness*2 - cross_tolerance);

// clip that spans the phone's width; sandwiched between vertical clip and RAM socket.
module HorizontalClip() {
	translate([0, 0, cross_offset])
	difference() {

		hull() {
			// main clip
			cube([phone_width + (2 * clip_thickness), phone_depth + (2 * clip_thickness), clip_width], center=true);

			// back plate (x width *2 is arbitrary!)
			translate([0, phone_depth/2 + clip_thickness*3/2, 0])
			cube([(clip_width + phone_width) / 2, clip_thickness, clip_width], center=true);
		}

		PhoneBlock();
		FacePlate(cross_grips);

		// notch for vertical clip - not a clean cut in preview
		translate([0, phone_depth/2 + hnotch_depth(cross_side), 0])
		cube([clip_width+ (cross_tolerance*2), clip_thickness*2, clip_width*2], center=true); // y*2, z*2 for clean cut
	}
}

// clip that spans the phone's height; has bolt holes for RAM socket.
module VerticalClip() {

	// rounded nubbin for top attachment
	translate([0, -phone_depth/2 - clip_thickness/2, phone_height/2 - grip_width + clip_thickness/2])
	rotate([0, 90, 0])
	cylinder(h=clip_width, r=clip_thickness/2, center=true);

	difference() {

		hull() {
			// main clip
			cube([clip_width, phone_depth + (2 * clip_thickness), phone_height + (2 * clip_thickness)], center=true);
			// back plate
			translate([0, phone_depth/2 + clip_thickness*3/2, cross_offset]) cube([clip_width, clip_thickness, bolt_spacing + clip_width], center=true);
		}

		PhoneBlock();
		FacePlate();
		BoltHoles();

		// trim a bit from the top grip - we'll use the rounded nubbin instead
		translate([0, -phone_depth/2-clip_thickness/2, phone_height/2-grip_width])
		cube([clip_width + 2, clip_thickness+1, clip_thickness], center=true);

		// notch for horizontal clip
		translate([0, phone_depth/2 + vnotch_depth(cross_side), cross_offset])
		cube([clip_width*2, clip_thickness*2, clip_width + (cross_tolerance*2)], center=true); // x*2, y*2 for clean cut

		if (iphone_tweaks == 1) {
			PlugHole();
			ButtonHole();
			FlashHole();
		}

		if (flex_ridges == 1) {
			FlexCuts();
		}
	}
}

module FlexCuts() {
	FlexCut();
	translate([0, 0, 8]) FlexCut();
	translate([0, 0, 16]) FlexCut();
	translate([0, clip_thickness*2, 4]) FlexCut();
	translate([0, clip_thickness*2, 12]) FlexCut();
	translate([0, clip_thickness*2, 20]) FlexCut();
}

module FlexCut() {
	translate([0, phone_depth/2, cross_offset + (bolt_spacing/2) + (clip_width/2)])
	rotate([0, 90, 0])
	cylinder(h=clip_width+2, r=3, center=true);
}

module BoltHoles() {
	translate([0, 0, cross_offset + bolt_offset]) BoltHole();
	translate([0, 0, cross_offset - bolt_offset]) BoltHole();
}

module BoltHole() {
	union() {
		// bolt hole
		translate([0, phone_depth/2 + clip_thickness, 0])
		rotate([90, 0, 0])
		cylinder(r=bolt_radius, h=clip_thickness*3, center=true);

		// recess for bolt head
		translate([0, phone_depth/2, 0])
		rotate([90, 0, 0])
		cylinder(r=head_radius, h=clip_thickness*2, center=true);
	}
}

// cutout for sleep/power button at top of vertical clip
module ButtonHole() {
	assign(button_width=14, button_depth=6, button_x=14.5) {
		translate([button_x, 0, phone_height/2 + clip_thickness/2])
		linear_extrude(height=clip_thickness * 2, center=true) // *2 for clean cut
		hull() {
			translate([-(button_width - button_depth) / 2, 0, 0]) circle(r=button_depth/2);
			translate([(button_width - button_depth) / 2, 0, 0]) circle(r=button_depth/2);
		}
	}
}

// cutout for power connector, assumed to be centered at bottom of phone
module PlugHole() {
	assign(plug_width=12, plug_depth=6) {
		translate([0, 0, -phone_height/2-clip_thickness/2])
		linear_extrude(height=clip_thickness * 2, center=true) // *2 for clean cut
		hull() {
			translate([-(plug_width - plug_depth) / 2, 0, 0]) circle(r=plug_depth/2);
			translate([(plug_width - plug_depth) / 2, 0, 0]) circle(r=plug_depth/2);
		}
	}
}

// cutout for flash on top back of vertical clip
module FlashHole() {
	assign(innerd = 7, outerd = 14, offset_x = 11, inset_y = 7.5) {

		// just for clean cut
		translate([offset_x, phone_depth/2, phone_height/2 - inset_y])
		rotate([90, 0, 0])
		cylinder(h = clip_thickness, r = innerd/2, center=true);

		translate([offset_x, phone_depth/2 + clip_thickness, phone_height/2 - inset_y])
		rotate([-90, 0, 0])
		cylinder(h = clip_thickness * 2, r1 = innerd/2, r2 = outerd/2, center=true);
	}
}

// mockup model of phone used to delete space from clips
module PhoneBlock() {
	cube([phone_width, phone_depth, phone_height], center=true);
}

// area in front of phone that is deleted from clips for front opening
module FacePlate(grips=1) {
	translate([0, -phone_depth/2 - clip_thickness/2, 0])
	cube([	phone_width - (grips == 1 ? (2 * grip_width) : 0 /*- clip_thickness*3*/),
			clip_thickness * 2, // *2 is excess for clean cut
			phone_height - (grips == 1 ? (2 * grip_width) : 0 /*- clip_thickness*3*/)], center=true);
}

```


[User]
I need a parametric OpenSCAD design for a GoPro mount that's compatible with Rokenbok building blocks. I want to be able to customize the mount's dimensions and have optional snap connectors for attaching it to other Rokenbok blocks.

Specifically, the design should have these features:

*   **GoPro Mount:** A cylindrical section that fits a standard GoPro mounting screw with a countersunk nut. I need parameters for the outer diameter (OD), inner diameter (ID) of the cylinder, the width of the cylinder, the width of the center part of the mount, the gap between the mounting arms, and dimensions for the captive nut, like the nut height, length and outer diameter.
*   **Rokenbok Block Integration:** The mount should have a base that's compatible with the Rokenbok block system. This means it should have a square shape with specific dimensions (like the block_length defined in the example), with cutouts at each edge, similar to those in the provided file. The base should have a wall thickness parameter.
*   **Optional Snap Connectors:** I want an option to include male snap connectors on the bottom of the Rokenbok base, similar to those seen in existing Rokenbok blocks. These should also be parametric to adjust the fit. I need to be able to specify the tolerance for both the male and female snap fits. I'd also like the option to turn these connectors off entirely.
*   **Supports:** I'd like to be able to optionally include support structures in the design, particularly under the snap fits and any overhangs, with their thickness adjustable.
*   **Fillets:** I want to be able to add fillets at key edges for structural integrity. I'll need fillet radii and length to be parametric.
*   **Print Settings:** The design should be suitable for 3D printing, considering the material thickness and tolerances needed for snap fits. I also need a parameter to set the $fn for more smooth curvature.

I'm not sure how to create fillets using the technique used in the attached files, so it'd be good to find a better way to do that if you can. I'd like you to provide me with the OpenSCAD code for this, including the Rokenbok block and the GoPro mount parts, and all parameters should be fully parametric.

I'd also like to use the `BOSL2` library if possible, as I know it can make some of this easier.

[Assistant]
goProRokenbokMount.scad:
```
snaps = 1; // [0:No Snaps,1:Snaps on Bottom]

/* [Advanced] */

// for single material printing
supports = 0; // [0:No Supports,1:Supports]

// 0.2 suggested for printing on MakerBot Replicator 2 with 0.2mm layer height
support_thickness = 0.2;

// increase if snap fits are too tight, decrease if snap fits are too loose. 0.3 suggested for MakerBot Replicator 2, 0.0 suggested for Shapeways
male_snap_fit_tolerance = 0;

// increase if snap fits are too tight, decrease if snap fits are too loose. 0.2 suggested for MakerBot Replicator 2, 0.0 suggested for Shapeways
female_snap_fit_tolerance = 0;

/* [GoPro Mount Parameters] */
OD = 15;
ID = 5.3;
width = 14.3;
center_width = 3.3;
gap = 3.1;
captive_nut_height = 3.4;
captive_nut_length = 8.1;
captive_nut_OD = 11;

/* [Hidden] */

/*These designs are owned by Rokenbok Education and published under license by kid*spark, a nonprofit corporation, for nonprofit and educational uses. Drawings of these designs are licensed under Creative Commons Attribution-NonCommercial-ShareAlike (BY-NC-SA) 3.0: http://creativecommons.org/licenses/by-nc-sa/3.0/ The drawings may be freely downloaded, modified, and used, providing that attribution is given to Rokenbok Education and the drawings are for non-commercial purposes. Any modified drawings are licensed under the same terms. The drawings are intended for educational and hobby uses only; 3D prints of these designs should not be considered toys or for use by children without adult supervision. The drawings are not guaranteed to print perfectly.*/

WINDOW = 12+female_snap_fit_tolerance;
BLOCK_LENGTH = 20;
WALL = 2;
captive_nut_width = 2*sqrt(pow(captive_nut_length/2,2)/3);

$fn = 50;

module block(origin = [0,0,0]) { // generate one block at origin
	translate(origin) {
		difference() {
		cube(size = BLOCK_LENGTH, center = true);
		cube(size = [BLOCK_LENGTH+1,WINDOW,WINDOW], center = true);
		cube(size = [WINDOW,BLOCK_LENGTH+1,WINDOW], center = true);
		cube(size = [WINDOW,WINDOW,BLOCK_LENGTH+1], center = true);
		cube(size = [BLOCK_LENGTH-2*WALL,BLOCK_LENGTH-2*WALL,BLOCK_LENGTH-2*WALL], center = true);
		translate([0,0,(BLOCK_LENGTH/2)])
			cube(size = [BLOCK_LENGTH+1,1,1], center = true);
		translate([0,0,-(BLOCK_LENGTH/2)])
			cube(size = [BLOCK_LENGTH+1,1,1], center = true);
		translate([0,-(BLOCK_LENGTH/2),0])
			cube(size = [BLOCK_LENGTH+1,1,1], center = true);
		translate([0,(BLOCK_LENGTH/2),0])
			cube(size = [BLOCK_LENGTH+1,1,1], center = true);
		translate([0,0,(BLOCK_LENGTH/2)])
			cube(size = [1,BLOCK_LENGTH+1,1], center = true);
		translate([0,0,-(BLOCK_LENGTH/2)])
			cube(size = [1,BLOCK_LENGTH+1,1], center = true);
		translate([0,-(BLOCK_LENGTH/2),0])
			cube(size = [1,1,BLOCK_LENGTH+1], center = true);
		translate([0,(BLOCK_LENGTH/2),0])
			cube(size = [1,1,BLOCK_LENGTH+1], center = true);
		rotate([0,0,90]) {
			translate([0,-(BLOCK_LENGTH/2),0])
				cube(size = [BLOCK_LENGTH+1,1,1], center = true);
			translate([0,(BLOCK_LENGTH/2),0])
				cube(size = [BLOCK_LENGTH+1,1,1], center = true);
			translate([0,-(BLOCK_LENGTH/2),0])
				cube(size = [1,1,BLOCK_LENGTH+1], center = true);
			translate([0,(BLOCK_LENGTH/2),0])
				cube(size = [1,1,BLOCK_LENGTH+1], center = true);
		} // end rotate
		} // end difference
		if (supports == 1) {
			translate([0,-(BLOCK_LENGTH/2-0.1),0])
				cube([4,0.2,WINDOW], center = true);
			translate([0,-(BLOCK_LENGTH/2-WALL+0.1),0])
				cube([4,0.2,WINDOW], center = true);
			translate([0,(BLOCK_LENGTH/2-0.1),0])
				cube([4,0.2,WINDOW], center = true);
			translate([0,(BLOCK_LENGTH/2-WALL+0.1),0])
				cube([4,0.2,WINDOW], center = true);
			if (snaps == 0) {
				rotate([0,0,90]) {
					translate([0,(BLOCK_LENGTH/2-0.1),0])
						cube([4,0.2,WINDOW], center = true);
					translate([0,(BLOCK_LENGTH/2-WALL+0.1),0])
						cube([4,0.2,WINDOW], center = true);
				} // end rotate
			} // end if snaps == 1
			difference() {
				cube([WINDOW+0.2,WINDOW+0.2,BLOCK_LENGTH-2*WALL], center = true);

				cube([WINDOW,WINDOW,BLOCK_LENGTH], center = true);
				cube([4,WINDOW+1,BLOCK_LENGTH-2*WALL], center = true);
				cube([WINDOW+1,4,BLOCK_LENGTH-2*WALL], center = true);
			} // end difference
		} // end if (supports != 0)
	} // end translate
} // end module block()

module snap(supports = 0, snap_fit_tolerance = 0.1, origin = [0,0,0], orientation = [0,0,0]) {
	translate(origin) rotate(orientation) difference() {
		union() {
			translate([-8.5-6.5/2,-(5.98-(1.5)/2),0])
				cube([6.5,1.5-snap_fit_tolerance,11.8], center = true);
			translate([-8.5-6.5+3.15/2,-5.98-0.8/2+snap_fit_tolerance/2,0])
				cube([5-1.95,0.8,11.8], center = true);
			translate([-(BLOCK_LENGTH/2)-1.53-(5-1.53)/2,-(5.98-1.5-0.75/2+snap_fit_tolerance/2),0])
				cube([5-1.53,0.75,11.8], center = true);
			// add fillets at attachment point
			translate([-8.5-0.5/2,-5.975+0.75,0]) {
				difference() {
					cube([0.5,1.5-snap_fit_tolerance+2*0.5,11.8+2*0.5], center = true);

						translate([-0.5/2,-1+snap_fit_tolerance/2-0.5/2,0])
							cylinder(h = 13, r = 0.5, $fs = 0.1, center = true);
						translate([-0.5/2,1-snap_fit_tolerance/2+0.5/2,0])
							cylinder(h = 13, r = 0.5, $fs = 0.1, center = true);
						translate([-0.5/2,0,11.8/2+0.5])
							rotate([90,0,0])
								cylinder(h = 3, r = 0.5, $fs = 0.1, center = true);
						translate([-0.5/2,0,-(11.8/2+0.5)])
							rotate([90,0,0])
								cylinder(h = 3, r = 0.5, $fs = 0.1, center = true);
				} // end difference fillet
			} // end translate
		} // end union
		// subtract 45 degree rotated "cubes"
		translate([-15,-6.78+snap_fit_tolerance/2,0])
			rotate([0,0,45])
				cube([2.54,2.54,12], center = true);
		translate([-11.95,-6.78+snap_fit_tolerance/2,0])
			rotate([0,0,45])
				cube([1.131371,1.131371,12], center = true);
		translate([-11.53,-3.73-snap_fit_tolerance/2,0])
			rotate([0,0,45])
				cube([1.06066,1.06066,12], center = true);
		translate([-14.714711,-3.444711-snap_fit_tolerance/2,0])
			rotate([0,0,30])
				cube([1.558846,1.558846,12], center = true);
		// subtract anti-fillet, doesn't work on polyhedra
		mirror([0,0,1]) {
			translate([-15+1.5,0,-5.9+1.5])
				difference() {
					cube([3.1,BLOCK_LENGTH,3.1], center = true);
					translate([1.5,0,1.5])
						rotate([90,0,0])
							cylinder(h = BLOCK_LENGTH+1, r = 3, $fs = 1, center = true);
				} // end difference
		} // end mirror
		translate([-15+1.5,0,-5.9+1.5])
			difference() {
				cube([3.1,BLOCK_LENGTH,3.1], center = true);
				translate([1.5,0,1.5])
					rotate([90,0,0])
						cylinder(h = BLOCK_LENGTH+1, r = 3, $fs=1, center = true);
			} // end difference
	} // end difference

	// supports
	if (supports != 0) {
		translate([-8.5-2.5,-(6-0.75),-5.9-4.1/2]) {
			difference() {
				cube([3.2,1.5-snap_fit_tolerance,4.1], center = true);
				translate([-0.2,0,3*0.2/2])
					cube([3,1.3-snap_fit_tolerance,4.1-3*0.2], center = true);
			} // end difference
		} // end translate
	} // end if (supports != 0)

	if (supports != 0)
		translate([-8.5-2.5,0,-5.9-4.1/2-4.1/2+3*0.2/2])
			cube([3.2,12-snap_fit_tolerance,3*0.2], center = true);
} // end module snap()

module filletX(rad = 0.5, length = 20, pos = [0,-(BLOCK_LENGTH/2),(BLOCK_LENGTH/2)], rot = [0,0,0]) {
	translate([pos[0],pos[1]-sign(pos[1])*rad/2,pos[2]-sign(pos[2])*rad/2])
		rotate(rot)
			rotate([0,0,90])
				difference() {
					cube([rad+.1,length+1,rad+.1], center = true);

					translate([rad/2,0,-rad/2])
						rotate([90,0,0])
							cylinder(r = rad, h = length+2, $fs = 0.1, center = true);
				} // end difference fillet
} // end module filletX()

module filletY(rad = 0.5, length = 20, pos = [-(BLOCK_LENGTH/2),0,(BLOCK_LENGTH/2)], rot = [0,0,0]) {
	translate([pos[0]-sign(pos[0])*rad/2,0,pos[2]-sign(pos[2])*rad/2])
		rotate(rot)
			difference() {
				cube([rad+.1,length+1,rad+.1], center = true);

				translate([rad/2,0,-rad/2])
					rotate([90,0,0])
						cylinder(r = rad, h = length+2, $fs = 0.1, center = true);
			} // end difference fillet
} // end module filletY()

module filletZ(rad = 0.5, length = 20, pos = [(BLOCK_LENGTH/2),-(BLOCK_LENGTH/2),0], rot = [0,0,90]) {
	translate([pos[0]-sign(pos[0])*rad/2,pos[1]-sign(pos[1])*rad/2],0)
		rotate(rot)
			rotate([90,0,0])
				difference() {
					cube([rad+.1,length+1,rad+.1], center = true);

					translate([rad/2,0,-rad/2])
						rotate([90,0,0])
							cylinder(r = rad, h = length+2, $fs = 0.1, center = true);
				} // end difference fillet
} // end module filletZ()

difference() {
	union() {
		block();
		translate([BLOCK_LENGTH/2+OD/2,0,0])
			rotate([90,0,0])
				cylinder(d = OD, h = width, center = true);
		translate([BLOCK_LENGTH/2+OD/4,0,0])
			cube([OD/2,width,OD], center = true);
		translate([BLOCK_LENGTH/2+OD/2,(width+captive_nut_height)/2,0])
			rotate([90,0,0])
				cylinder(d = captive_nut_OD, h = captive_nut_height, center = true);
		translate([BLOCK_LENGTH/2+OD/4,(width+captive_nut_height)/2,0])
			cube([OD/2,captive_nut_height,captive_nut_OD], center = true);
		translate([BLOCK_LENGTH/2-WALL/2,0,0])
			cube([WALL,WINDOW,WINDOW], center = true);

		if (supports == 1) {
			translate([(BLOCK_LENGTH+OD)/2-3,0,-BLOCK_LENGTH/2+(BLOCK_LENGTH-OD)/4])
				cube([support_thickness,width,(BLOCK_LENGTH-OD)/2], center = true);

			translate([BLOCK_LENGTH/2+OD/4,(width-support_thickness)/2,-BLOCK_LENGTH/2+(BLOCK_LENGTH-OD)/4])
				cube([OD/2,support_thickness,(BLOCK_LENGTH-OD)/2], center = true);
			translate([BLOCK_LENGTH/2+OD/4,(center_width-support_thickness)/2,-BLOCK_LENGTH/2+(BLOCK_LENGTH-OD)/4])
				cube([OD/2,support_thickness,(BLOCK_LENGTH-OD)/2], center = true);
			translate([BLOCK_LENGTH/2+OD/4,gap+(center_width+support_thickness)/2,-BLOCK_LENGTH/2+(BLOCK_LENGTH-OD)/4])
				cube([OD/2,support_thickness,(BLOCK_LENGTH-OD)/2], center = true);
			mirror([0,1,0]) {
				translate([BLOCK_LENGTH/2+OD/4,(width-support_thickness)/2,-BLOCK_LENGTH/2+(BLOCK_LENGTH-OD)/4])
					cube([OD/2,support_thickness,(BLOCK_LENGTH-OD)/2], center = true);
				translate([BLOCK_LENGTH/2+OD/4,(center_width-support_thickness)/2,-BLOCK_LENGTH/2+(BLOCK_LENGTH-OD)/4])
					cube([OD/2,support_thickness,(BLOCK_LENGTH-OD)/2], center = true);
				translate([BLOCK_LENGTH/2+OD/4,gap+(center_width+support_thickness)/2,-BLOCK_LENGTH/2+(BLOCK_LENGTH-OD)/4])
					cube([OD/2,support_thickness,(BLOCK_LENGTH-OD)/2], center = true);
			} // end mirror
			translate([BLOCK_LENGTH/2+OD/2,(width+captive_nut_height)/2,-BLOCK_LENGTH/2+(BLOCK_LENGTH-captive_nut_OD)/4])
				cube([support_thickness,captive_nut_height,(BLOCK_LENGTH-captive_nut_OD)/2], center = true);
			translate([BLOCK_LENGTH/2+OD/4+support_thickness,width/2+captive_nut_height-support_thickness/2,-BLOCK_LENGTH/2+(BLOCK_LENGTH-captive_nut_OD)/4])
				cube([OD/2,support_thickness,(BLOCK_LENGTH-captive_nut_OD)/2], center = true);
		} // end if supports == 1
	} // end union

	translate([BLOCK_LENGTH/2+OD/2,0,0])
		rotate([90,0,0])
			cylinder(d = ID, h = width+2*captive_nut_height+1, center = true);

	translate([BLOCK_LENGTH/2+15/2,center_width/2+gap/2,0])
		rotate([90,0,0])
			cylinder(d = OD+1, h = gap, center = true);
	mirror([0,1,0])
		translate([BLOCK_LENGTH/2+15/2,center_width/2+gap/2,0])
			rotate([90,0,0])
				cylinder(d = OD+1, h = gap, center = true);

	translate([BLOCK_LENGTH/2+OD/2,(width+captive_nut_height+1)/2,0])
		for (i = [00:60:120]) {
			rotate([0,i,0])
				cube([captive_nut_length,captive_nut_height+1,captive_nut_width], center = true);
		} // end for

	filletX();
	mirror([0,1,0]) filletX();
	mirror([0,0,1]) filletX();
	mirror([0,1,0]) mirror([0,0,1]) filletX();

	filletY();
	mirror([1,0,0]) filletY();
	mirror([0,0,1]) filletY();
	mirror([1,0,0]) mirror([0,0,1]) filletY();

	filletZ();
	mirror([0,1,0]) filletZ();
	mirror([1,0,0]) filletZ();
	mirror([0,1,0]) mirror([1,0,0]) filletZ();

	if (snaps == 1) {
		translate([-(BLOCK_LENGTH/2),0,0])
			cube([3,BLOCK_LENGTH-2*WALL,BLOCK_LENGTH+1], center = true);
	} // end if snaps == 1

} // end difference

if (snaps == 1) {
	//rotate([0,-90,0]) {
		translate([-7.75,0,0])
			difference() {
				cube([1.5,BLOCK_LENGTH-2*WALL,BLOCK_LENGTH-2*WALL], center = true);
				cube([WALL,3,12], center = true);
			} // end difference
			snap(supports, male_snap_fit_tolerance);
			mirror([0,1,0])
				snap(supports, male_snap_fit_tolerance);
	//} // end rotate
} // end if snaps == 1
```


[User]
I need a parametric OpenSCAD design for a smartphone mount that's compatible with Rokenbok building blocks. The mount should have a slot to hold the phone, and I need to be able to adjust the width, height, and depth of that slot to fit different phones. The base of the mount should be Rokenbok-compatible.

Here's what I'm envisioning for parameters:

*   `slot_width`: The width of the phone slot, in mm.
*   `slot_height`: The height of the phone slot, in mm.
*   `wall_thickness`: The thickness of the walls around the slot, in mm.
*   `floor_height`: The thickness of the floor of the slot, in mm.
*   `snaps`: A boolean option (1 for true, 0 for false) to include male Rokenbok snaps on the bottom of the mount.
*   `male_snap_fit_tolerance`: A value to adjust the fit of the male snaps.
*   `female_snap_fit_tolerance`: A value to adjust the fit of the female Rokenbok connectors.
*   `supports`: A boolean option (1 for true, 0 for false) to add support structures during printing, particularly on the Rokenbok connector, if they exist.

The design should use the standard Rokenbok block dimensions where applicable. The core block itself is 20mm on each side. There should be a 2mm wall on each side of the central block volume. I'd like the code to be clear and commented, please, so I can understand what's going on. Also, please include fillets for any sharp corners to make the model more robust and better looking.

Finally, could you make sure the Rokenbok connectors and their slots are all generated appropriately using the correct dimensions, including the little side supports when they're generated?

I'd like all the files to use the same parameter names, and if you could please make use of the `BOSL2` library, that would be great. Also, I guess we'll use standard OpenSCAD units for everything (mm).

[Assistant]
smartphoneRokenbokMount.scad:
```
// in mm, For iPhone 5/5s try 7.9
slot_width = 7.9;

// in mm
slot_height = 10;

// in mm, must be >= 1
wall_thickness = 4;

//in mm
floor_height = 0.6;

snaps = 1; // [0:No Snaps,1:Snaps on Bottom]

// for single material printing
supports = 0; // [0:No Supports,1:Supports]

// increase if snap fits are too tight, decrease if snap fits are too loose. 0.3 suggested for MakerBot Replicator 2, 0.0 suggested for Shapeways
male_snap_fit_tolerance = 0;

// increase if snap fits are too tight, decrease if snap fits are too loose. 0.2 suggested for MakerBot Replicator 2, 0.0 suggested for Shapeways
female_snap_fit_tolerance = 0;

/* [Hidden] */

/*These designs are owned by Rokenbok Education and published under license by kid*spark, a nonprofit corporation, for nonprofit and educational uses. Drawings of these designs are licensed under Creative Commons Attribution-NonCommercial-ShareAlike (BY-NC-SA) 3.0: http://creativecommons.org/licenses/by-nc-sa/3.0/ The drawings may be freely downloaded, modified, and used, providing that attribution is given to Rokenbok Education and the drawings are for non-commercial purposes. Any modified drawings are licensed under the same terms. The drawings are intended for educational and hobby uses only; 3D prints of these designs should not be considered toys or for use by children without adult supervision. The drawings are not guaranteed to print perfectly.*/

WINDOW = 12+female_snap_fit_tolerance;
BLOCK_LENGTH = 20;
WALL = 2;
slot_length = BLOCK_LENGTH;

module block(origin = [0,0,0]) { // generate one block at origin
	translate(origin) {
		difference() {
		cube(size = BLOCK_LENGTH, center = true);
		cube(size = [BLOCK_LENGTH+1,WINDOW,WINDOW], center = true);
		cube(size = [WINDOW,BLOCK_LENGTH+1,WINDOW], center = true);
		cube(size = [WINDOW,WINDOW,BLOCK_LENGTH+1], center = true);
		cube(size = [BLOCK_LENGTH-2*WALL,BLOCK_LENGTH-2*WALL,BLOCK_LENGTH-2*WALL], center = true);
		translate([0,0,(BLOCK_LENGTH/2)])
			cube(size = [BLOCK_LENGTH+1,1,1], center = true);
		translate([0,0,-(BLOCK_LENGTH/2)])
			cube(size = [BLOCK_LENGTH+1,1,1], center = true);
		translate([0,-(BLOCK_LENGTH/2),0])
			cube(size = [BLOCK_LENGTH+1,1,1], center = true);
		translate([0,(BLOCK_LENGTH/2),0])
			cube(size = [BLOCK_LENGTH+1,1,1], center = true);
		translate([0,0,(BLOCK_LENGTH/2)])
			cube(size = [1,BLOCK_LENGTH+1,1], center = true);
		translate([0,0,-(BLOCK_LENGTH/2)])
			cube(size = [1,BLOCK_LENGTH+1,1], center = true);
		translate([0,-(BLOCK_LENGTH/2),0])
			cube(size = [1,1,BLOCK_LENGTH+1], center = true);
		translate([0,(BLOCK_LENGTH/2),0])
			cube(size = [1,1,BLOCK_LENGTH+1], center = true);
		rotate([0,0,90]) {
			translate([0,-(BLOCK_LENGTH/2),0])
				cube(size = [BLOCK_LENGTH+1,1,1], center = true);
			translate([0,(BLOCK_LENGTH/2),0])
				cube(size = [BLOCK_LENGTH+1,1,1], center = true);
			translate([0,-(BLOCK_LENGTH/2),0])
				cube(size = [1,1,BLOCK_LENGTH+1], center = true);
			translate([0,(BLOCK_LENGTH/2),0])
				cube(size = [1,1,BLOCK_LENGTH+1], center = true);
		} // end rotate
		} // end difference
		if (supports == 1) {
			translate([0,-(BLOCK_LENGTH/2-0.1),0])
				cube([4,0.2,WINDOW], center = true);
			translate([0,-(BLOCK_LENGTH/2-WALL+0.1),0])
				cube([4,0.2,WINDOW], center = true);
			translate([0,(BLOCK_LENGTH/2-0.1),0])
				cube([4,0.2,WINDOW], center = true);
			translate([0,(BLOCK_LENGTH/2-WALL+0.1),0])
				cube([4,0.2,WINDOW], center = true);
			if (snaps == 0) {
				rotate([0,0,90]) {
					translate([0,(BLOCK_LENGTH/2-0.1),0])
						cube([4,0.2,WINDOW], center = true);
					translate([0,(BLOCK_LENGTH/2-WALL+0.1),0])
						cube([4,0.2,WINDOW], center = true);
				} // end rotate
			} // end if snaps == 1
			difference() {
				cube([WINDOW+0.2,WINDOW+0.2,BLOCK_LENGTH-2*WALL], center = true);

				cube([WINDOW,WINDOW,BLOCK_LENGTH], center = true);
				cube([4,WINDOW+1,BLOCK_LENGTH-2*WALL], center = true);
				cube([WINDOW+1,4,BLOCK_LENGTH-2*WALL], center = true);
			} // end difference
		} // end if (supports != 0)
	} // end translate
} // end module block()

module snap(supports = 0, snap_fit_tolerance = 0.1, origin = [0,0,0], orientation = [0,0,0]) {
	translate(origin) rotate(orientation) difference() {
		union() {
			translate([-8.5-6.5/2,-(5.98-(1.5)/2),0])
				cube([6.5,1.5-snap_fit_tolerance,11.8], center = true);
			translate([-8.5-6.5+3.15/2,-5.98-0.8/2+snap_fit_tolerance/2,0])
				cube([5-1.95,0.8,11.8], center = true);
			translate([-(BLOCK_LENGTH/2)-1.53-(5-1.53)/2,-(5.98-1.5-0.75/2+snap_fit_tolerance/2),0])
				cube([5-1.53,0.75,11.8], center = true);
			// add fillets at attachment point
			translate([-8.5-0.5/2,-5.975+0.75,0]) {
				difference() {
					cube([0.5,1.5-snap_fit_tolerance+2*0.5,11.8+2*0.5], center = true);

						translate([-0.5/2,-1+snap_fit_tolerance/2-0.5/2,0])
							cylinder(h = 13, r = 0.5, $fs = 0.1, center = true);
						translate([-0.5/2,1-snap_fit_tolerance/2+0.5/2,0])
							cylinder(h = 13, r = 0.5, $fs = 0.1, center = true);
						translate([-0.5/2,0,11.8/2+0.5])
							rotate([90,0,0])
								cylinder(h = 3, r = 0.5, $fs = 0.1, center = true);
						translate([-0.5/2,0,-(11.8/2+0.5)])
							rotate([90,0,0])
								cylinder(h = 3, r = 0.5, $fs = 0.1, center = true);
				} // end difference fillet
			} // end translate
		} // end union
		// subtract 45 degree rotated "cubes"
		translate([-15,-6.78+snap_fit_tolerance/2,0])
			rotate([0,0,45])
				cube([2.54,2.54,12], center = true);
		translate([-11.95,-6.78+snap_fit_tolerance/2,0])
			rotate([0,0,45])
				cube([1.131371,1.131371,12], center = true);
		translate([-11.53,-3.73-snap_fit_tolerance/2,0])
			rotate([0,0,45])
				cube([1.06066,1.06066,12], center = true);
		translate([-14.714711,-3.444711-snap_fit_tolerance/2,0])
			rotate([0,0,30])
				cube([1.558846,1.558846,12], center = true);
		// subtract anti-fillet, doesn't work on polyhedra
		mirror([0,0,1]) {
			translate([-15+1.5,0,-5.9+1.5])
				difference() {
					cube([3.1,BLOCK_LENGTH,3.1], center = true);
					translate([1.5,0,1.5])
						rotate([90,0,0])
							cylinder(h = BLOCK_LENGTH+1, r = 3, $fs = 1, center = true);
				} // end difference
		} // end mirror
		translate([-15+1.5,0,-5.9+1.5])
			difference() {
				cube([3.1,BLOCK_LENGTH,3.1], center = true);
				translate([1.5,0,1.5])
					rotate([90,0,0])
						cylinder(h = BLOCK_LENGTH+1, r = 3, $fs=1, center = true);
			} // end difference
	} // end difference

	// supports
	if (supports != 0) {
		translate([-8.5-2.5,-(6-0.75),-5.9-4.1/2]) {
			difference() {
				cube([3.2,1.5-snap_fit_tolerance,4.1], center = true);
				translate([-0.2,0,3*0.2/2])
					cube([3,1.3-snap_fit_tolerance,4.1-3*0.2], center = true);
			} // end difference
		} // end translate
	} // end if (supports != 0)

	if (supports != 0)
		translate([-8.5-2.5,0,-5.9-4.1/2-4.1/2+3*0.2/2])
			cube([3.2,12-snap_fit_tolerance,3*0.2], center = true);
} // end module snap()

module filletX(rad = 0.5, length = 20, pos = [0,-(BLOCK_LENGTH/2),(BLOCK_LENGTH/2)], rot = [0,0,0]) {
	translate([pos[0],pos[1]-sign(pos[1])*rad/2,pos[2]-sign(pos[2])*rad/2])
		rotate(rot)
			rotate([0,0,90])
				difference() {
					cube([rad+.1,length+1,rad+.1], center = true);

					translate([rad/2,0,-rad/2])
						rotate([90,0,0])
							cylinder(r = rad, h = length+2, $fs = 0.1, center = true);
				} // end difference fillet
} // end module filletX()

module filletY(rad = 0.5, length = 20, pos = [-(BLOCK_LENGTH/2),0,(BLOCK_LENGTH/2)], rot = [0,0,0]) {
	translate([pos[0]-sign(pos[0])*rad/2,0,pos[2]-sign(pos[2])*rad/2])
		rotate(rot)
			difference() {
				cube([rad+.1,length+1,rad+.1], center = true);

				translate([rad/2,0,-rad/2])
					rotate([90,0,0])
						cylinder(r = rad, h = length+2, $fs = 0.1, center = true);
			} // end difference fillet
} // end module filletY()

module filletZ(rad = 0.5, length = 20, pos = [(BLOCK_LENGTH/2),-(BLOCK_LENGTH/2),0], rot = [0,0,90]) {
	translate([pos[0]-sign(pos[0])*rad/2,pos[1]-sign(pos[1])*rad/2],0)
		rotate(rot)
			rotate([90,0,0])
				difference() {
					cube([rad+.1,length+1,rad+.1], center = true);

					translate([rad/2,0,-rad/2])
						rotate([90,0,0])
							cylinder(r = rad, h = length+2, $fs = 0.1, center = true);
				} // end difference fillet
} // end module filletZ()

difference() {
	union() {
		block();
		translate([BLOCK_LENGTH/2+floor_height/2,0,0])
			cube([floor_height,slot_width,slot_length], center = true);
		translate([BLOCK_LENGTH/2+slot_height/2,slot_width/2+wall_thickness/2,0])
			cube([slot_height,wall_thickness,slot_length], center = true);
		mirror([0,1,0])
			translate([BLOCK_LENGTH/2+slot_height/2,slot_width/2+wall_thickness/2,0])
				cube([slot_height,wall_thickness,slot_length], center = true);
		translate([BLOCK_LENGTH/2-WALL/2,0,0])
			cube([WALL,WINDOW,WINDOW], center = true);
	} // end union

	filletX();
	mirror([0,1,0]) filletX();
	mirror([0,0,1]) filletX();
	mirror([0,1,0]) mirror([0,0,1]) filletX();

	filletY();
	mirror([1,0,0]) filletY();
	mirror([0,0,1]) filletY();
	mirror([1,0,0]) mirror([0,0,1]) filletY();

	filletZ();
	mirror([0,1,0]) filletZ();
	mirror([1,0,0]) filletZ();
	mirror([0,1,0]) mirror([1,0,0]) filletZ();

	filletZ(rad = 1, length = slot_length, pos = [BLOCK_LENGTH/2+slot_height,slot_width/2+1,0]);
	mirror([0,1,0])
		filletZ(rad = 1, length = slot_length, pos = [BLOCK_LENGTH/2+slot_height,slot_width/2+1,0]);

	if (snaps == 1) {
		translate([-(BLOCK_LENGTH/2),0,0])
			cube([3,BLOCK_LENGTH-2*WALL,BLOCK_LENGTH+1], center = true);
	} // end if snaps == 1

} // end difference

if (snaps == 1) {
	//rotate([0,-90,0]) {
		translate([-7.75,0,0])
			difference() {
				cube([1.5,BLOCK_LENGTH-2*WALL,BLOCK_LENGTH-2*WALL], center = true);
				cube([WALL,3,12], center = true);
			} // end difference
			snap(supports, male_snap_fit_tolerance);
			mirror([0,1,0])
				snap(supports, male_snap_fit_tolerance);
	//} // end rotate
} // end if snaps == 1
```


[User]
I'm looking to create a customizable coin holder, and I'd like to generate an OpenSCAD file that can handle different coin types and a few design parameters.

Here's what I envision:

*   **Coin Types:** I need to be able to specify different sets of coins: United States (common), United States (all), and Euro coins. The design should adjust automatically based on the selected coin type. I'd like to store the coin diameters (including a small tolerance) in a list for each coin set and use them to calculate the correct diameter for each tube.

*   **Tube Arrangement:** The coins should be held in individual cylindrical tubes, arranged concentrically. The innermost tube should hold the smallest diameter coin and the outermost the largest diameter coin.

*   **Gaps:** Each tube should have a radial gap, and I want to be able to specify the angle (in degrees) of that gap. The default should be 30 degrees, and the user should be able to adjust it.

*   **Wall Thickness:** The wall thickness of each coin tube should be adjustable. A default of 2 mm would be good.

*   **Base:** The coin tubes should have a solid base. It should have a height that can be controlled by the user, defaulting to 4mm.

*   **Stackability:** It would be excellent if there were an option to indent the base of the tubes so that multiple coin holders can be stacked on top of each other. The indentation height would be adjustable, and a default of 0 (no indentation) would be fine.

*   **Tube Height:** I need to be able to control the height of the coin tubes themselves, which should be adjustable from 1mm to 300mm and default to 60mm.

*   **Tolerance:** It should be possible to specify the tolerance added to the inner diameter of the coin tubes, with a default of 0.5mm.

*   **Parameterization:** Every dimension should be adjustable through customizable variables in OpenSCAD.

I'm not looking for anything super fancy, just a practical and easily customizable design. I'm thinking this will probably use linear extrudes, cylinders, translations, and differences, maybe using a `module` to handle the tube generation and another for the base. I don't need to use any external libraries, just OpenSCAD's built-in features.

[Assistant]
coins.scad:
```

part = "us"; // ["us":United States (common),"us_all":United States (all),"eu",Euro]

// Size of the gaps in coin tubes, in degrees.
gap = 30; // [0:180]

// Diameter of the coin tube wall.
d_wall = 2;

// The height of the base.
h_base = 4;
// Indent the base of the tubes so that trays are stackable
h_indent = 0;
// The height of the coin tube
h = 60; // [1:300]

// Tolerance added to the inner diameter of the coin tubes
tolerance = 0.5;

/* [Hidden] */

tol = tolerance;

r_us_coin = [(24.26 + tol) / 2,  // Quarter
             (21.21 + tol) / 2,  // Nickel
             (19.05 + tol) / 2,  // Penny
             (17.91 + tol) / 2]; // Dime

r_us_all_coin = [(30.61 + tol) / 2,  // Half dollar
                 (26.49 + tol) / 2,  // Dollar
                 r_us_coin[0],
                 r_us_coin[1],
                 r_us_coin[2],
                 r_us_coin[3]];

r_eu_coin = [(25.75 + tol) / 2,  // 2
             (24.25 + tol) / 2,  // .50
             (23.25 + tol) / 2,  // 1
             (22.25 + tol) / 2,  // .20
             (21.25 + tol) / 2,  // .05
             (19.75 + tol) / 2,  // .10
             (18.75 + tol) / 2,  // .02
             (16.25 + tol) / 2]; // .01

r_coin = (part == "us"     ? r_us_coin :
          part == "us_all" ? r_us_all_coin
                           : r_eu_coin);

function uvec(theta) = [cos(theta), sin(theta)];

// Locals... locals would be so nice...
function tan_pt(c1, r1, c2, r2) =
    tan_pt_(c1, r1, c2, r2,
            h=norm(c2 - c1), dc=c2 - c1);

function tan_pt_(c1, r1, c2, r2, h, dc) =
    tan_pt__(c1, r1, c2, r2, h,
            theta_0=acos((r1 - r2) / h),
            theta_1=atan(dc[1] / dc[0]));

function tan_pt__(c1, r1, c2, r2, h, theta_0, theta_1) =
    c1 + r1 * uvec(theta_0 + theta_1);

function coin_offset(n) = r_coin[n] + (n == 0 ? 0
                                              : d_wall +
                                                r_coin[n - 1] +
                                                coin_offset(n - 1));

module thing() {
    o = [0, 0];
    fudge = 400;

    linear_extrude(height=h + 1)
        polygon([o,
                 o + fudge * uvec(0 - gap + $fudge_gap),
                 o + fudge * uvec(0 + gap - $fudge_gap)]);
}

$fudge_d = 0;
$fudge_gap = 0;

module coins(n) {
    translate([0, r_coin[n], 0]) {
        difference() {
            cylinder(r=r_coin[n] + d_wall, h=h, $fn=128);

            translate([0, 0, -0.1])
            cylinder(r=r_coin[n] - $fudge_d, h=h + 0.2, $fn=128);

            translate([0, 0, -0.1])
                union() {
                    thing();
                    mirror()
                        thing();
                }
        }

        if (n + 1 < len(r_coin)) {
            translate([0, r_coin[n] + d_wall, 0])
                coins(n + 1);
        }
    }
}

module coin_base(n) {
    translate([0, coin_offset(n), 0])
        cylinder(r=r_coin[n] + d_wall,
                 h=h_base, $fn=128);
}

ncoin = len(r_coin) - 1;

c1 = [0, coin_offset(0)];
c2 = [0, coin_offset(ncoin)];
v1 = tan_pt(c1=c1,
            c2=c2,
            r1=r_coin[0] + d_wall,
            r2=r_coin[ncoin] + d_wall);
v2 = tan_pt(c1=c2,
            c2=c1,
            r1=r_coin[ncoin] + d_wall,
            r2=r_coin[0] + d_wall);

difference() {
    union() {
        translate([0, 0, h_base])
            coins(0);

        coin_base(0);
        coin_base(len(r_coin) - 1);

        linear_extrude(height=h_base)
            polygon([v1, [-1 * v2[0], v2[1]],
                     v2, [-1 * v1[0], v1[1]]]);
    }

    if (h_indent) {
        assign($fudge_d=0.5, $fudge_gap=2) {
            translate([0, 0, -h + h_indent])
                coins(0);
        }
    }
}

// vim:se sts=4 sw=4 et:

```