[User]
I'd like to design a keychain for an event at the University of Washington Bothell. I have a basic design idea, but I need it to be parametric, so I can easily change things like the text, size, etc.

The keychain should have a main body that's essentially a rounded rectangle shape. I want to achieve this by creating a hull around a rectangle and four cylinders. The rectangle is 80mm wide, 16mm tall and 2mm thick, and should be centered. Then, there should be four cylinders, each with a 2mm radius and 2mm height, placed at the corners (+/- 40mm on the x-axis, and +/- 8mm on the y-axis relative to center). These cylinders should also be centered.

I also need a rectangular cutout near the left end of the main body, which should be 4mm wide, 12mm tall, and 10mm thick. This cutout needs to be centered vertically and positioned at x=-36mm.

On the left side of the keychain, I want the text "W BOTHELL" oriented vertically. "W" should be on top and "BOTHELL" underneath. The "W" should be scaled to 1.75 on x and 1 on y and z, and be 10mm tall with a thickness of 2mm. It should be placed 3mm above the center, and 1mm thick from the base. "BOTHELL" should be below "W", centered horizontally on "W", scaled to 1 on x,y, and z, 3.5mm tall, 2mm thick, and placed 5mm below the center. Both should use the Orbitron font. This entire block should be rotated 90 degrees around the z-axis and translated to x=-24mm.

Finally, on the right side, I want to add the name of the event, which I'd like to make a variable. The event name should be written in the Orbitron font, 10mm tall, 2mm thick, centered, translated to x=11mm from the center, and sitting 1mm from the base.

Please use the `write` module from `Write.scad`. I would also like the entire file to be parameterized such that all of these numbers can be modified from the top level, like the text, body size, etc.

[Assistant]
UWB_Keychain_Custom.scad:
```
use <write/Write.scad>
text="BATMAN"; //input name here!

difference(){
	hull(){
		cube([80,16,2],center=true);

		translate([40,8,0])cylinder(r=2,h=2,center=true,$fn=20);
		translate([-40,8,0])cylinder(r=2,h=2,center=true,$fn=20);
		translate([40,-8,0])cylinder(r=2,h=2,center=true,$fn=20);
		translate([-40,-8,0])cylinder(r=2,h=2,center=true,$fn=20);
	}

	translate([-36,0,0])cube([4,12,10],center=true);
}

translate([-24,0,0])rotate([0,0,90])
union(){
	translate([0,3,1])scale([1.75,1,1])write("W",t=2,h=10,center=true,font="orbitron.dxf");
	translate([0,-5,1])scale([1,1,1])write("BOTHELL",t=2,h=3.5,center=true,font="orbitron.dxf");
}

translate([11,0,1])write(text,t=2,h=10,center=true,font="orbitron.dxf");
```


[User]
Hey, I'm looking to create a customizable storage box system with drawers, and I'd like to use OpenSCAD for this. I've got a basic idea, but I need a parametric design that's flexible enough to handle different sizes and configurations.

Here's what I'm thinking:

**Core Components:**

*   **Drawers:** These need to be fully customizable in terms of inner dimensions (width, height, and length).
*   **Enclosure:**  The enclosure will hold multiple drawers, arranged in rows and columns. The overall size will depend on the number of drawers I want, and the enclosure should account for a small clearance around each drawer to make sliding them in and out easy.
*   **Labels:** I want an optional cutout on the drawer front for a label. The depth of this cutout will also be customizable.
*   **Handles:** The drawers should have a handle. I want to control the handle's length, depth, and height. Also, it would be cool if I could add indents to the handle (on the top and sides).

**Parameters I need to control:**

*   **Drawer:**
    *   `drawerWidthInner`: Inner width of the drawer
    *   `drawerHeightInner`: Inner height of the drawer
    *   `drawerLengthInner`: Inner length of the drawer
    *   `enabelLabel`:  Boolean to enable/disable the label cutout
    *   `depthLabel`: Depth of the label cutout
    *   `handleHeight`: Height of the handle
    *   `handleDepth`: How much the handle sticks out from the drawer
    *   `handleLength`: Length of the handle
    *   `handleIndentWidth`: Width of the indents
    *   `handleIndentTop`: Depth of the top indent on the handle
    *   `handleIndentSide`: Depth of the side indents on the handle
*   **Enclosure:**
    *   `columns`: Number of columns
    *   `rows`: Number of rows
    *   `enclosureClearance`: Space between the drawer and the enclosure
*   **Printer Specific:**
    *   `nozzleSize`: Diameter of the 3D printer nozzle
    *   `walls`: Thickness of walls. This should be a multiple of the nozzle size.
*  **View**
    *  `part`: Lets me select which parts are rendered "drawer", "enclosure", or "all".

**Other Requirements:**

*   I want the code to be well-structured and use modules for the drawer and the enclosure, possibly another one for handle as well.
*   The wall thickness of the drawer should take into account `nozzleSize`.
*   The `enclosureClearance` needs to be considered when calculating enclosure dimensions.
*   I want to have an option to preview individual parts (just the drawer, just the enclosure, or both).
* I am expecting three .stl files to be produced - one of each of those views.
* Please make sure to use comments in the code to indicate what the code is doing.

Could you generate OpenSCAD code for this, keeping in mind that it should be modular and easy to modify in the future? I don't need you to use any libraries.

[Assistant]
storage_box.scad:
```
// preview[view:south west, tilt:top diagonal]

/* [Drawer: Base] */
// Inner width of the drawer
drawerWidthInner = 20;
// Inner height of the drawer
drawerHeightInner = 10;
// Inner length of the drawer
drawerLengthInner = 65;

/* [Drawer: Label] */
// Enable cutout for a label?
enabelLabel = "true"; // [true,false]
// The depth of the label should be the multiple of your nozzle size
depthLabel = 0.4;

/* [Drawer: Handle] */
// Height of the handle
handleHeight = 3;
// How  much the handle sticks out of the drawer
handleDepth = 7;
// The length of the handle. This should not be more than the width of the drawer
handleLength = 18.4;
// Indent Width
handleIndentWidth = 0;
// Indent depth of top of handle
handleIndentTop = 0;
// Indent depth on the side of the handle
handleIndentSide = 0;

/* [Enclosure] */
// Choose the amount of columns
columns = 4; // [1:100]
// Choose the amount of rows
rows = 3; // [1:100]
// The slot for the drawer will be by this much bigger than the drawer itself. Set this to a value accounting for shrinking/expansion of the material you are using.
enclosureClearance = 0.7;

/* [Printer specific] */
// Nozzle diameter of your printer
nozzleSize = 0.4;
// Walls should be a multiple of your nozzle size
walls = 0.8;

/* [View] */
// Which parts would you like to see?
part = "all"; // [drawer:Drawer Only, enclosure:Enclosure Only, all:Enclosure and Drawer]

/* [Hidden] */
drawerWidthOuter = drawerWidthInner + walls * 2;
drawerHeightOuter = drawerHeightInner + walls;
drawerLengthOuter = drawerLengthInner + walls * 2;

print_part();

module print_part() {
	if(part == "enclosure")
		rotate([270, 0, 0])
			printEnclosure();
	else if(part == "drawer")
		printDrawer();
	else
		printBoth();
}

module printEnclosure() {
	enclosure(rows, columns, drawerLengthOuter, drawerWidthOuter, drawerHeightOuter, enclosureClearance, walls);
}

module printDrawer() {
	drawer(drawerWidthInner, drawerHeightInner, drawerLengthInner, walls, enabelLabel, depthLabel, handleLength, handleDepth, handleHeight, handleIndentTop, handleIndentSide, handleIndentWidth);
}

module printBoth() {
	printDrawer();

	translate([drawerWidthOuter + 10, 0, 0])
		printEnclosure();
}

module enclosure(rows, columns, length, width, height, padding, walls) {
	widthSingle = width + padding;
	heightSingle = height + padding;
	lengthSingle = length + (padding / 2);

	widthOuter = (widthSingle + walls) * columns + walls;
	heightOuter = (heightSingle + walls) * rows + walls;
	lengthOuter = lengthSingle + walls;

	difference() {
		cube([widthOuter, lengthOuter, heightOuter]);

		for(row = [0 : rows - 1])
			for(column = [0 : columns - 1])
				translate([walls + (widthSingle + walls) * column, -1, walls + (heightSingle + walls) * row])
					cube([widthSingle, lengthSingle + 1, heightSingle]);
	}

}

module drawer(width, height, length, walls, label, depthLabel, lengthHandle, depthHandle, heightHandle, topIndent, sideIndent, widthIndent) {
	widthOuter = width + walls * 2;
	heightOuter = height + walls;
	lengthOuter = length + walls * 2;

	difference() {
		cube([widthOuter, lengthOuter, heightOuter]);

		translate([walls, walls, walls])
			cube([width, length, height + 1]);

		/* Cutout for the label */
		if(label== "true")
			translate([walls * 2, -1, handleHeight + walls * 2])
				cube([width - (walls * 2), 1 + depthLabel, height + 1]);
	}

	/* Attach the handle */
	translate([(widthOuter - lengthHandle) / 2, -depthHandle, 0]) {
		difference() {
			cube([lengthHandle, depthHandle, heightHandle]);

			/* Top indent */
			if(topIndent > 0 && widthIndent > 0)
				translate([-1, depthHandle - widthIndent, heightHandle - topIndent])
					cube([lengthHandle + 2, widthIndent + 1, topIndent + 1]);

			/* Left indent */
			if(sideIndent > 0 && widthIndent > 0)
				translate([-1, depthHandle - widthIndent, -1])
					cube([sideIndent + 1, widthIndent + 1, heightHandle + 2]);

			/* Right indent */
			if(sideIndent > 0 && widthIndent > 0)
				translate([lengthHandle - sideIndent, depthHandle - widthIndent, -1])
					cube([sideIndent + 1, widthIndent + 1, heightHandle + 2]);
		}
	}
}

```


[User]
I need a customizable, adjustable fan holder for my MK8 extruder. I'd like it to be parametric so I can adjust it for different fan sizes, and I want to be able to mount a fan on either the left or right side of the extruder.

Specifically, I need the design to include these parts: a face plate that attaches to the MK8 extruder, a hinge slide that fits onto the face plate's rail, a fan plate that attaches to the hinge slide and holds the fan, and a directional duct that attaches to the fan plate to direct airflow. The fan plate should support both hole and slot mounting options for the duct. I'm picturing a design with a dovetail joint for the hinge slide on the faceplate, and a hinge joint for the fan plate that lets me adjust the fan's height and tilt.

I also want to be able to rotate the rail slides on the faceplate a bit, to help with wire clearance. I'll need parameters for these rotations (one for the left side, one for the right). I want to be able to adjust the distance from the nozzle to the duct output, too.

I am using a build_plate.scad file which is going to display the build plate in the previews, it does not need to be generated. I also don't need any libraries other than standard OpenSCAD functionality to make this.

Here's a breakdown of the adjustable parameters I need:

**[Face Plate]**

*   `rail_polar_1`: Rotation angle of the left rail slide.
*   `rail_polar_2`: Rotation angle of the right rail slide.
*   `faceplate_base_width`: Width of the extruder boss.
*   `faceplate_base_height`: Height of the base.
*   `faceplate_base_depth`: Depth of the base.
*   `faceplate_hole_diam`: Diameter of the mounting thru-holes.
*  `faceplate_hole_dist`: Distance between the mounting thru-holes.
*   `rail_width0`: Narrowest width of the rail slide.
*   `rail_depth`: Depth of the rail slide.
*   `rail_length`: Height of the rail slide.
*   `rail_offset`: Flat bar offset of the rail.
* `rail_clear`: Clearance between rail and coupling.

**[Hinge Slide]**

*   `hinge_diam`: Inscribed diameter of the hinge.
*   `hinge_holediam`: Hinge hole diameter for the bolt.
*   `hinge_clear_axial`: Clearance between hinge couplings in the axial direction.
*   `hinge_nutwidth`: Minor hex width of the nut pocket.
*   `hinge_nutdepth`: Depth of the nut pocket.
*   `hingeslide_block_holediam`: Diameter of the screw stop hole.
*   `hingeslide_dovelength`: Extra length for the dovetail mating feature.

**[Fan/Duct]**

*   `noz_yoffset`: Distance from nozzle to frontplate mounting face (Y-axis).
*   `duct_mount`: "Hole" or "Slot" for mounting the duct.
*   `fan_width`: Width (and height) of the fan.
*   `fan_holedist`: Distance between fan mounting holes.
*   `fan_holediam`: Diameter of the fan mounting holes.
*   `fan_clear`: Clearance between the fan and the plate walls.
*  `duct_output_diam`: Output diameter of the fan duct.
*   `duct_output_height`: Height of the duct output.
*   `duct_length`: Length of the fan duct.
*   `duct_angle`: Tilt angle of the duct.
*   `push_hinge_to_edge`: Boolean whether to push the hinge flush with the frame. ("Yes" or "No")

The preview should show a build plate.

[Assistant]
Customizable_MK8-Adjustable-Fan-Holder.scad:
```
// Copyright 2015 Arthur Davis (thingiverse.com/artdavis)
// This file is licensed under a Creative Commons Attribution 4.0
// International License.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

// Customizable adjustable fan holder for the MK8 extruder. Fan holders for
// any custom size fan can be made and then attached on the left and/or
// right side of the extruder then adjusted for height and tilt.

// While using the customizer, you may select each individual
// part to preview using the "Part" drop down menu which is
// available in all tabs. To have a zoomed in view of an individual
// part go to the [Build plate] tab and set the "Show Build Plate"
// dropdown to "No". You may also tweak the display of the build plate
// here in accordance with your own printer platform.

// Get a good measurement for the distance (in the Y-axis)
// from the center of your extruder nozzle to the front plate
// mounting surface of your MK8 and set this value for
// noz_yoffset in the [Fan/duct] tab. It was 8mm for my MK8
// but I've seen variation on this between different extruders.
// This measurement is used to make sure the output of the
// duct vent is aimed directly at the tip of the nozzle.

// Depending on where the wires route on your extruder, you
// may want to add some rotation to the rail slides so the fan
// plate does not interfere with the wires. Adjust rail_polar_1
// for the left side and rail_polar_2 for the right side under
// the [Face Plate] tab as necessary.

// If you do add any rail_polar rotation consider setting
// duct_mount="Slot" (vs. the default of "Hole"). This way
// when mounting the duct you can compensate for the rotation
// of the rail by rotating the duct so the duct output is
// optimally aimed at the tip of the nozzle.
// You may also adjust hinge_yoff to manually recenter the fan
// plate on the extruder nozzle but then you'll need to download
// the OpenSCAD source and do it manually (this won't work in
// the Customizer).

// Measure the width and hole spacing of your fan and set
// the fan_width and fan_holedist settings in the [Fan/Duct] tab.
// Typically for a 60mm fan: fan_width=60; fan_holedist=50;
// Typically for a 40mm fan: fan_width=40; fan_holedist=32;

// Use a thread forming screw to jam the hinge slide in place
// on the dovetail. If you're using a non-low profile fan it may
// be difficult to get a driver in to tighten the screw. You
// can increase the hingeslide_dovelength variable to make a taller
// rail slide for easier access.

// The default settings are optimized for assembling with a 60mm
// fan and M3 nut/bolt hardware; printed with 0.4mm nozzle at
// 0.2mm layer thickness.

// Units are in mm

// Optimize view for Makerbot Customizer:
// preview[view:"south west", tile:"top"]

/* [Global] */
// Choose geometry to preview:
part = "All"; // [Face_Plate, Hinge_Slide, Fan_Plate_1, Fan_Plate_2, Directional_Duct, All]

/* [Face Plate] */
// Left side rail polar angle for blower clearance
rail_polar_1 = 0; // [0:5:45]
// Right side rail polar angle for blower clearance
rail_polar_2 = 20; // [0:5:45]
// Width of the MK8 extruder boss
faceplate_base_width = 42;
// Height of base
faceplate_base_height = 10;
// Depth of the base
faceplate_base_depth = 6;
// Diameter of thru-holes
faceplate_hole_diam = 4.0;
// Distance between thru-holes
faceplate_hole_dist = 31;
// Narrowest width of the rail slide
rail_width0 = 6;
// Depth of the rail slide
rail_depth = 2;
// Height of the rail slide
rail_length = 50;
// Flat bar offset of the rail
rail_offset = 2;
// Clearance between rail and coupling
rail_clear = 0.4;

/* [Hinge Slide] */
// Inscribed diameter of the hinge
hinge_diam = 8.0;
// Hinge hole diameter
hinge_holediam = 4.0;
// Clearance between couplings in axial direction
hinge_clear_axial = 0.2;
// Minor hex width of hexagonal nut pocket
hinge_nutwidth = 5.6;
// Depth of the hexnut pocket
hinge_nutdepth = 2.0;
// Hole diameter for screw stop in rail block
hingeslide_block_holediam = 2.0;
// Extra length to add to dovetail mating feature
hingeslide_dovelength = 10;
//hingeslide_dovelength = 16; // For 60mm box type fan
//hingeslide_dovelength = 6; // For 40mm low profile fan

/* [Fan/Duct] */
// Distance from nozzle to frontplate mounting face in Y-axis
noz_yoffset = 8.0;
// Slot or hole mounting feature for the duct?
duct_mount = "Hole"; // [Hole, Slot]
// Width (and height) of the square fan
fan_width = 60; // For 60mm fan
//fan_width = 40; // For 40mm fan
// Distance between the mounting holes
fan_holedist = 50; // For 60mm fan
//fan_holedist = 32; // For 40mm fan
// Diameter of the holes to make in the mount plate
fan_holediam = 4.0;
// Clearance between the fan exterior and the plate walls interior
fan_clear = 0.2;
// Output diameter for the fan duct
duct_output_diam = 4;
// Height of the duct output for the directional duct
duct_output_height = 6.0;
// Length of the fan duct
duct_length = 38; // For 60mm fan
//duct_length = 40; // For 40mm fan
// How much to tilt the duct direction
duct_angle = 45;
// Whether hinge should be flush with frame edge
push_hinge_to_edge = "No"; // [Yes, No]

/* [Build Plate] */
use <utils/build_plate.scad>;
// Show build plate?
show_build_plate = "Yes"; // [Yes, No]
// For display only, doesn't contribute to final object
build_plate_selector = 3; //[0:Replicator 2,1: Replicator,2:Thingomatic,3:Manual]
//For "Manual" option: Build plate x dimension
build_plate_manual_x = 200; //[100:400]
//For "Manual" option: Build plate y dimension
build_plate_manual_y = 200; //[100:400]
if (show_build_plate == "Yes") {
    build_plate(build_plate_selector,build_plate_manual_x,build_plate_manual_y);
}

/* [Hidden] */
// Herein variable definitons hidden from Customizer
// For a 45deg rail slope, the max width is simple:
rail_width1 = rail_width0 + 2*rail_depth;
// Width of the block that mates with the dovetail
hingeslide_block_width = rail_depth + 2;
// Depth of the block that mates with the dovetail
hingeslide_block_depth = rail_width1 + hingeslide_dovelength;
//hingeslide_block_depth = rail_width1 + 16;
// Height of the block that mates with the dovetail
hingeslide_block_height = 16;
// Length of the hinge
hinge_length = hingeslide_block_height;
// Transverse clearance between the hinge couplings
hinge_clear_transverse = 1.2;
// Width of the hinge coupling on the fan holder
fan_hingewidth = 9;
// Width of the walls of the fanplate
fan_wallthick = 2.0;
// Outside width of the U-coupling
uwidth = hinge_length + 2*fan_hingewidth;
// Fan carriage outer wall width
owd = fan_width + 2 * (fan_clear + fan_wallthick);
// Fan carriage inner wall width
iwd = owd - 2 * fan_wallthick;
// Chamfer offset
chamoffset = hinge_diam / 4;
// Set boolean based on Yes/No input in faceplate_rail_bracer
// This doesn't work in Customizer
//faceplate_top_brace = (faceplate_rail_bracer == "Yes") ? true : false;
// Calculate the cone angle for the base duct
cone_angle = atan((iwd - duct_output_diam) / (2 * duct_length));
// Reinforce the top of the rails with brace?
// This doesn't work in Customizer
//faceplate_rail_bracer = "Yes"; // ["Yes", "No"]
// How far to offset the hinge from center to center fan on nozzle
hinge_yoff = (push_hinge_to_edge == "Yes") ? 0 :
    (owd/2 - uwidth/2) - (noz_yoffset + faceplate_base_depth/2);
// Set hinge_yoff manually here as necessary:
// hinge_yoff = <manual_value>;
// hinge_yoff=10.4; // For 40mm fan right side with 20deg polar rotation
// Cap vent feature for directing air flow?
//duct_capvent = "Yes"; // [Yes, No]

// Compute the hexagonal major diameter from the supplied minor width
function hexmajor(minor) = 2 * minor / sqrt(3);

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

module rail(w0, d, l, o) {
    // w0: Short face width of the rail
    // d:  Depth of the rail
    // l:  Length of the rail
    // o:  Offset protrusion distance
    // For a 45deg rail slope, the max width is simple:
    w1 = w0 + 2*d;
    translate([-o, 0, 0])
    union() {
        translate([o/2, 0, l/2]) {
            // Flat bar
            cube([o*1.01, w0, l], center=true);
            // Round post in case rail is rotated
            translate([o/2,0,0])
            cylinder(d=w0, h=l, $fn=100, center=true);
        }
        // Dovetail bar
        difference() {
            translate([-d/2, 0, l/2])
            cube([d, w1, l], center=true);
        // Dovetail trimming blocks
            // Side 1
            translate([0, -w1/2, l/2])
            rotate(45)
            cube([2*d/sqrt(2), 2*d/sqrt(2), 1.1*l], center=true);
            // Side 2
            translate([0, w1/2, l/2])
            rotate(45)
            cube([2*d/sqrt(2), 2*d/sqrt(2), 1.1*l], center=true);
        }
     }
}

//module faceplate(topbrace=true) {
    // Parameter: topbrace (default: true) for including the
    // the brace at the top for extra rigidity. It may be
    // a challenging bridge to print so optionally omit
    // if topbrace parameter is false
    // Doesn't work in Customizer. Just always have it.
module faceplate() {
    union() {
    rotate([90, 0, 0]) translate([0, faceplate_base_height/2, 0])
    union() {
    //translate([0, faceplate_base_height/2, faceplate_base_depth/2]) {
    difference() {
    // Base block
    cube([faceplate_base_width, faceplate_base_height,
          faceplate_base_depth], center=true);
    // Thru holes
    translate([faceplate_hole_dist/2, 0, 0])
    cylinder(h=1.1*faceplate_base_depth, d=faceplate_hole_diam,
        $fn=100, center=true);
    translate([-faceplate_hole_dist/2, 0, 0])
    cylinder(h=1.1*faceplate_base_depth, d=faceplate_hole_diam,
        $fn=100, center=true);
    }
    }
    // Left Side rail
    translate([-faceplate_base_width/2, 0, 0])
    rotate([0,0,rail_polar_1])
    rail(rail_width0, rail_depth, rail_length, rail_offset);
    // Right Side rail
    translate([faceplate_base_width/2, 0, 0])
    rotate([0, 0, 180-rail_polar_2])
    rail(rail_width0, rail_depth, rail_length, rail_offset);
    // Top side cross brace
    //if (topbrace) { // Doesn't work in Customizer
        brace_height = faceplate_base_height / 2;
        translate([0, 0, rail_length-brace_height/2])
        cube([faceplate_base_width, rail_width0,
        brace_height], center=true);
    //    }
    }
}

module hingeslide() {
    // Slide coupling
    translate([hingeslide_block_width + rail_offset, 0, 0])
    difference() {
        // Base
        translate([-(hingeslide_block_width + rail_offset),
                     -hingeslide_block_height/2, 0])
        cube([hingeslide_block_width, hingeslide_block_height,
              hingeslide_block_depth]);
        // Rail cutout
        translate([0, 0, -0.1])
        rail(rail_width0 + 2*rail_clear, rail_depth + rail_clear,
              rail_length, rail_offset);
        // Arrestor hole cutout
        translate([-rail_offset, 0,
                   hingeslide_block_depth - 3*hingeslide_block_holediam/2])
        rotate([0,-90,0])
        cylinder(h=hingeslide_block_width*1.1,
                 d=hingeslide_block_holediam, $fn=100);
    }
    // Hinge
    difference() {
        difference() {
        union() {
            difference() {
                translate([-hinge_diam, -hinge_length/2, 0])
                cube([hinge_diam, hinge_length, hinge_diam]);
                // Cutout for top-round
                translate([-hinge_diam, 0, hinge_diam])
                cube([hinge_diam, 1.1*hinge_length, hinge_diam], center=true);
                }
                translate([-hinge_diam/2, -hinge_length/2, hinge_diam/2])
                rotate([-90,0,0])
                cylinder(d=hinge_diam, h=hinge_length, $fn=100);
            }
                // Cutout for bottom chamfer
                translate([-(hinge_diam + chamoffset), 0, 0])
                rotate([0, 45, 0])
                cube([hinge_diam/sqrt(2), 1.1*hinge_length,
                       hinge_diam/sqrt(2)], center=true);
    }
        translate([-hinge_diam/2, 0, hinge_diam/2])
        rotate([-90,0,0])
        cylinder(d=hinge_holediam, h=1.1*hinge_length, $fn=100, center=true);
    }
}

module holepunch() {
    // Punch the mounting holes for the fan
    // in the fan plate.
    x1 = -(fan_width + 2 * (fan_clear + fan_wallthick) - fan_holedist)/2;
    x2 = x1 - fan_holedist;
    y1 = -x1;
    y2 = y1 + fan_holedist;
    translate([x1, y1, 0])
    cylinder(d=fan_holediam, h=4*fan_wallthick, center=true, $fn=100);
    translate([x2, y1, 0])
    cylinder(d=fan_holediam, h=4*fan_wallthick, center=true, $fn=100);
    translate([x1, y2, 0])
    cylinder(d=fan_holediam, h=4*fan_wallthick, center=true, $fn=100);
    translate([x2, y2, 0])
    cylinder(d=fan_holediam, h=4*fan_wallthick, center=true, $fn=100);
}

module fancarriage(height=hinge_diam){
    // Parameters
    // height: how tall the carriage will be. Default is the hinge_diam
    //         set it to fan_wallthick for a flat plate
    difference() {
        // Outer wall
        translate([-owd, 0, 0])
        cube([owd, owd, height]);
        // Only need to cut out inner wall if there is enough height
        // for a pocket
        if (height > fan_wallthick) {
            // Inner wall
            translate([-(iwd + fan_wallthick), fan_wallthick, fan_wallthick])
            cube([iwd, iwd, height]);
        }
        // Blow hole
        translate([-owd/2, owd/2, 0])
        cylinder(d=iwd - 2*fan_wallthick,
                 h=4*fan_wallthick, center=true, $fn=100);
        holepunch();
    }
}

module ductplate(){
    d0 = fan_holedist*sqrt(2);
    d1 = d0 - fan_holediam;
    d2 = d0 + fan_holediam;
    d3 = d2 + 2*fan_holediam;
    intersection() {
        union() {
            difference() {
                // Outer wall
                translate([-owd, 0, 0])
                cube([owd, owd, fan_wallthick]);
                // Blow hole
                translate([-owd/2, owd/2, 0])
                cylinder(d=iwd - 2*fan_wallthick,
                         h=4*fan_wallthick, center=true, $fn=100);
                //holepunch();
                translate([-owd/2, owd/2, 0])
                difference() {
                    cylinder(d=d2, h=2.1*fan_wallthick,
                             $fn=100, center=true);
                    cylinder(d=d1, h=2.2*fan_wallthick,
                             $fn=100, center=true);
                }
            }
                difference()
                {
                    translate([-owd, 0, 0])
                    cube([owd, owd, fan_wallthick]);
                    translate([-owd/2, owd/2, 0])
                    cube([iwd, iwd, 2.1*fan_wallthick], center=true);
                }
            }
        translate([-owd/2, owd/2, 0])
        cylinder(d=d3, h=2.1*fan_wallthick, $fn=100, center=true);
        }
}

module fanplate() {
    // U-coupling
    union() {
    translate([hinge_diam, hinge_yoff, 0])
    difference() {
        // Exterior U-coupling base
        difference() {
        union() {
            difference() {
                translate([-hinge_diam, 0, 0])
                cube([2*hinge_diam, uwidth, hinge_diam]);
                // Cutout for the top round
                translate([hinge_diam/2, -0.1, hinge_diam/2])
                cube([hinge_diam, 1.1*uwidth, hinge_diam]);
            }
            // Top round
            translate([hinge_diam/2, 0, hinge_diam/2])
            rotate([-90, 0, 0])
            cylinder(d=hinge_diam, h=uwidth, $fn=100);
        }
        // Bottom chamfer
        translate([hinge_diam/2 + chamoffset, -0.1, 0])
        rotate([0, 45, 0])
        cube([hinge_diam/sqrt(2), 1.1*uwidth, hinge_diam/sqrt(2)]);
        }
        // Interior cut for the hinge mate
        translate([-hinge_clear_transverse,
                   fan_hingewidth - hinge_clear_axial, -0.1])
        cube([hinge_diam*1.1 + hinge_clear_transverse,
              hinge_length + 2*hinge_clear_axial, hinge_diam*1.1]);
        // Thru hole for the hinge pin
        translate([hinge_diam/2,-0.1,hinge_diam/2])
        rotate([-90,0,0])
        cylinder(d=hinge_holediam, h=1.1*uwidth, $fn=100);
        // Hex nut pocket
        translate([hinge_diam/2, uwidth - hinge_nutdepth, hinge_diam/2])
        rotate([-90,0,0])
        cylinder(h=4, d=hexmajor(hinge_nutwidth), $fn=6);
    }
    // Carriage for holding the fan
        fancarriage();
    }

}

module simpleduct() {
    // Simple conical duct for directing air from the fan
    translate([owd/2, -owd/2, 0])
    fancarriage(height=fan_wallthick);
    difference() {
        translate([0, 0, fan_wallthick - 0.01])
        cylinder(h=duct_length, d1=owd,
                 d2=duct_output_diam + 2*fan_wallthick, $fn=100);
        translate([0, 0, fan_wallthick - 0.05])
        cylinder(h=duct_length*1.01, d1=iwd,
                 d2=duct_output_diam, $fn=100);
    }
}

module directduct(duct_mount=duct_mount) {
    // More complex directional duct
    M = [ [1, 0, 0, 0],
          [0, 1, tan(duct_angle), 0],
          [0, 0, 1, 0],
          [0, 0, 0, 1] ];
    translate([0, 0, fan_wallthick])
    union() {
        translate([owd/2, -owd/2, -fan_wallthick])
        if (duct_mount == "Hole")
            fancarriage(height=fan_wallthick);
        else if (duct_mount == "Slot")
            ductplate();
        difference() {
            union() {
            // Skewed duct
            multmatrix(M)
            difference() {
                // Duct cone outer shell
                cylinder(h=duct_length, d1=iwd,
                         d2=duct_output_diam + 2*fan_wallthick, $fn=100);
                // Duct cone inner shell
                // (2 small offsets to remove CSG critical overlap)
                translate([0, 0, -0.05])
                cylinder(h=duct_length, d1=iwd - 2*fan_wallthick,
                         d2=duct_output_diam, $fn=100);
                translate([0, 0, 0.05])
                cylinder(h=duct_length, d1=iwd - 2*fan_wallthick,
                         d2=duct_output_diam, $fn=100);
            }
            //if (duct_capvent == "Yes")
            //    // Cap for the top
            //    translate([0, duct_length * tan(duct_angle),
            //               duct_length - fan_wallthick])
            //    cylinder(h=fan_wallthick, d=duct_output_diam + 2*fan_wallthick);
            }
            //if (duct_capvent == "Yes")
            //    // Output nozzle cutter
            //    translate([0,
            //               duct_length * tan(duct_angle) + duct_output_diam*.8,
            //               duct_length-duct_output_height/2+0.1])
            //    cube([duct_output_diam+2*fan_wallthick,
            //          duct_output_diam+2*fan_wallthick,
            //          duct_output_height], center=true);
            // Cut the top perpendicular to the tilt of the
            // cone to direct air at the nozzle tip
            ventod = duct_output_diam + 2*fan_wallthick; // Outer diameter of vent
            cuwd = ventod * 2; // cutter cube width
            ydc = duct_length * tan(duct_angle); // y-coord of duct output center
            translate([0, ydc - ventod/2, duct_length])
            rotate([-duct_angle, 0, 0])
            translate([0, duct_output_diam/2 + fan_wallthick, cuwd/2])
            cube(cuwd, center=true);
        }
    }
}

// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

module all_geom() {
    dx = 10;
    dy = 10;
    // Face_Plate
    //faceplate(topbrace=faceplate_top_brace);
    faceplate();
    // Hinge_Slide
    translate([-faceplate_base_width, 0, 0])
        hingeslide();
    // Fan_Plate_1
    translate([-(2*hinge_diam + dx), hinge_length/2 + dy, 0])
    fanplate();
    // Fan_Plate_2
    translate([2*hinge_diam + dx, hinge_length/2 + dy, 0])
    rotate([0, 0, 180])
    mirror([0,1,0]) fanplate();
    // Ducts
    translate([owd/2+dx, -(owd/2 + 3*dy/2) , 0])
    //simpleduct();
    rotate([0,0,-90])
    directduct(duct_mount="Slot");
    // Directional_Duct
    translate([-(owd/2+dx), -(owd/2 + 3*dy/2) , 0])
    rotate([0,0,90])
    directduct();
}

// Allow MakerBot Customizer to generate STL based on part selection
module print_part() {
    if (part == "Face_Plate") {
        //faceplate(topbrace=faceplate_top_brace);
        faceplate();
    } else if (part == "Hinge_Slide") {
        hingeslide();
    } else if (part == "Fan_Plate_1") {
        fanplate();
    } else if (part == "Fan_Plate_2") {
        mirror([0, 1, 0])
        fanplate();
    } else if (part == "Simple_Duct") {
        simpleduct();
    } else if (part == "Directional_Duct") {
        directduct();
    } else if (part == "All") {
        all_geom();
    } else {
        all_geom();
    }
}

// For running in native OpenSCAD
//show_build_plate = "No"; // Default is Yes
//part = "Face_Plate";
//part = "Hinge_Slide";
//part = "Fan_Plate_1";
//part = "Fan_Plate_2";
//part = "Simple_Duct";
//part = "Directional_Duct";
part = "All";
print_part();

```


[User]
I'm looking to create a custom harmonica comb, and I'd like to design it using OpenSCAD so I can easily adjust the dimensions for different harmonicas in the future. I've been using a Suzuki Olive, and the plastic/wood composite comb isn't very smooth, so I want to make a replacement from a slippery plastic. I need a parametric design, and it also needs to be able to be set up to do laser cutting as well. I'd like to be able to adjust different parameters for the comb itself, the reed plates, and the screw hole locations, with different parameters controlling recessing, screw hole sizes, etc. I'll need to be able to specify if I want recessed reed plates or flush, and be able to control the slot depths and spacing, and different corner radius. I want a preview of what the comb looks like, the comb with plates, an exploded view and a 2D slice which is slow and should only be used at the end. I also would like a test piece for adjusting the hole oversize.

Here's a breakdown of the features I need in the OpenSCAD design:

**Global Settings**
*   A way to choose what to show:
    *   Comb Only
    *   Assembled (comb + reed plates + screws)
    *   Exploded view of comb, reed plates, and screws.
    *   2D Slice of just the comb (for DXF export, laser cutting).
    *   Test piece for hole sizes
*   Switches to control showing/hiding reed plates and screws.
*   A parameter to adjust for the printer's hole oversize (HoleOS), which is a printer-specific setting. This should be applied to screw holes.

**Harmonica-Specific Settings**
*   Harmonica name (this is just a text label).

**Comb Dimensions**
*   Comb length (L), width (W), and thickness (T).
*   Corner radius (CornerR) for the outer corners.
*   Option to have the reed plates recessed into the comb or flush (FlushReedPlates).

**Cover Hole Parameters**
*  `CoverHoleXEdge`: Distance from the outside edge of cover screw hole to the side of the comb.
*  `CoverHoleYEdge`: Distance from the front edge of the cover screw hole to front of the comb.
*   `CoverHoleD`: Diameter of the cover holes in the comb
*  `CoverScrewHoleD`: Diameter to make the cover holes in comb.

**Slot Dimensions**
*  `FullSlots`: Boolean switch. Controls whether the slots have a lip or not.
*   `SlotDivider`: Thickness of the material between slots.
*   `SlotPitchTotalOuter`: Total distance occupied by all slots to the outer edges (this is important to measure).
*   `SlotDepths`: A list of depths for each slot. Can have the start and end depth, which will be interpolated, or all depths can be entered individually.
*   `NumSlots`: The number of slots in the comb (should be 10 for a standard diatonic harmonica).
*   `SlotR`: Radius of the outside corners of slots (against the tongue).
*   `SlotInnerR`: Radius of the inside corners of slots (for better cleaning).

**Reed Plate Dimensions**
*   `ReedPlateX`: Actual reed plate length.
*   `ReedPlateY`: Actual reed plate width.
*   `ReedPlateZ`: Depth of reed plate recess into the comb.
*   `ReedPlateY1`: Offset from the front edge of the comb to the front edge of the reed plate.
*   `RecessOversize`: Amount to make the recess bigger than the plate.
*   `ReedPlateXOffset`: Sideways offset for the reed plate if not centered.
*   `ReedPlateR`: Radius of reed plate corners.
*   `ReedScrewHoleD`: Diameter of screw holes in the comb for the reed plate.
*  `ReedPlateScrewHoleD`: Size of holes in the reed plate
*   `ReedScrewPos`: List of x, y pairs. Measure from left and front of reedplate to edge of holes.
*  `ReedScrewHoleD2`: Diameter of the second type screw holes
* `ReedPlateScrewHoleD2`: Diameter of the second type screw holes in the reedplate.
*   `ReedScrewPos2`: List of x, y pairs for the 2nd hole.

**Internal Variables and Logic**
*   A variable to toggle between showing the exploded or assembled view.
*   Calculate the number of reed plate screws (NumReedScrews) from the list length of ReedScrewPos.
*  Calculate the number of reed plate screws (NumReedScrews2) from the list length of ReedScrewPos2.
*   Calculate the radius of the screw holes from diameters.
*   Calculate the position of the reed plate edges.
*  Calculate the cover hole radius and the cover hole x and y positions
*  Calculate cover hole pitch
*   Logic to derive slot width and spacing from total slot distance and number of slots.
*   Error message if the slot depth list does not match the number of slots (10) or 2.
*   Internal values for ReedPlateX1 and Slot1X to position the plates and slots correctly.
*   Internal value SlotT, being T -2 x  ReedPlateZ if not recessed.

**Modules:**
*   `TestHoles()`: Generates a test piece with two different hole sizes.
*   `Comb()`: Assembles all the parts of the comb.
*   `ReedPlates()`: Generates the reed plate recesses, with or without an oversize.
*   `Holes()`: Generates the screw holes.
*    `rcube()`: A module for making rounded cubes.
*   `Fillet()`: Module for the radius corners.
*   `Slot2()`: Generates the slots using slot.
*   `Slot()`: Creates the slot shapes, using the Fillet module.
*   Display messages to the console with the calculated slot parameters, and error message for SlotDepths.

**2D Slice**
* When WhatToShow is set to 3, perform a 2D slice operation on the comb, for laser cutting.

I'm imagining a single .scad file for this, but if you think it would be better to break it up into multiple files I'm fine with that. I think this should cover everything, but please let me know if you need any clarifications. The code should be written in a way that the Customizer is supported and all these variables can be configured. I do not have any libraries I need to include.

[Assistant]
HarmonicaComb_SuzukiOlive.scad:
```
//Harmonica Comb Builder

/*[Global]*/
WhatToShow=0;//[0:Comb Only, 1:Assembled, 2:Exploded,3:2D Slice (for DXF export),4:Hole Test Piece (to set HoleOversize)]
//Slice to 2D is for DXF export. (for laser cutting)
//**Slicing is VERY SLOW**, do it when design is finalised.
//Export DXF from menu File->Export->export to DXF .

/*[View]*/
ShowReedPlates=1;//[1:Show,0:hide]
ShowScrews=1;//[1:Show,0:hide]

//Slice to 2D for DXF export. **Slicing is VERY SLOW** .
//ShowSlice=0;//[0:3D,1:2D]
//--------- Printer Specific ---------------------
//HoleOversize corrects for 3D printer making holes the wrong size - too big or small. This is printer specific, and is diameter.+ve make holes bigger
HoleOS=0.1;
//---------- Harmonica Specific BEGINS ------
//Enter Harmonica Name (does nothing)
HarmonicaType="Suzuki Olive";

//minimum wall thickness around holes. For holes through slot dividers that need thickening
ScrewHoleWall=1;

/*[Comb]*/

FlushReedPlates=1; //[0:Recessed Into Comb,1:Flush ON Comb]
//Length of Comb
L=100.5;
//Width of Comb
W=26.8;
//Thickness of Comb
T=6.3;
//Radius of outer corners of comb
CornerR=3;

/*[Cover]*/
//Measure outside edge of cover hole to side of comb
CoverHoleXEdge=4.3;
//Measure front edge of cover hole to front of comb
CoverHoleYEdge=10.8;

//Diameter of cover holes measured in comb for CoverHoleXEdge
CoverHoleD=4;

//Diameter to make cover holes in your comb
CoverScrewHoleD=4;

/*[Slots]*/

//When reedplate recesses are used,can cut through lip
FullSlots=0; //[0:Has Lip,1: No Lip]

//Not measuring Width and Pitch as too hard to measure accurately.
//Measured at opening end.
//SlotWidth=4.25;
//Spacing of slots. (0 or -ve to use Total)
//SlotPitch=-10;

//Measured at opening end.
SlotDivider=3.2;

//Total distance across all slots to outer edges
SlotPitchTotalOuter=71.3;

//Left to right. Either have 2 values - it will interpolate, or all (10) values
SlotDepths=[23.2,22.4,21.6,20.8,20,    19.2,18.4,17.6,16.8,16];
//SlotDepths=[25,24,23,22,21,20,19,18,17,16];
//Diatonic Harps have 10 holes
NumSlots=10;
//Radius of outside corner of slot (against tongue)
SlotR=1;
//inner corner radius - makes it a bit nore cleanable
SlotInnerR=2;

/*[Reeds]*/

//Actual ReedPlate dimension
ReedPlateX=100.8;
ReedPlateY=27.2;
//Depth of Reedplate recess into comb
ReedPlateZ=0.93;

//Offset to front edge of ReedPlate (-ve if reedplate bigger than comb
ReedPlateY1=-0.2;
//Make the recess this much bigger than the plate
RecessOversize=1;
//adjust reedplate sideways if not perfectly centred
ReedPlateXOffset=0;

//Radius reedplate corners
ReedPlateR=2;

//Hole size in comb for reedplate screws (Main hole size)
ReedScrewHoleD=2.6;
//Size of holes in reedplate itself (used to offset Pos measurements)
ReedPlateScrewHoleD=2.2;
//x,y pairs. Measure from left and front of holes to edge of reedplate (not centres)
ReedScrewPos=[[9.6,5.8],[9.6,17.8],[26.9,22.8],[49.4,22.8] ,[71.9,19.3],[89,5.8],[89,17.8]];

//Hole size in comb for reedplate screws (2nd hole size)
ReedScrewHoleD2=2.1;
//Size of holes in reedplate itself (2nd hole size)
ReedPlateScrewHoleD2=2.2;
//x,y pairs. (2nd hole size)
ReedScrewPos2=[[49.4,5.8]];
//---------- Harmonica Specific ENDS ------

/*[Hidden]*/
//----------------------
ShowExploded=(WhatToShow==2);
//FlushReedPlate=(RecessedReedPlate==0;
NumReedScrews=len(ReedScrewPos);
ReedScrewR=ReedScrewHoleD/2;

NumReedScrews2=len(ReedScrewPos2);
ReedScrewR2=ReedScrewHoleD2/2;

ReedPlateX1=(L-ReedPlateX)/2 + ReedPlateXOffset;
CoverHoleR=CoverHoleD/2;
CoverScrewHoleR=CoverScrewHoleD/2;
CoverHoleX=CoverHoleXEdge+CoverHoleR;
CoverHoleY=CoverHoleYEdge+CoverHoleR;
CoverHolePitch=L- 2*CoverHoleX;

//if (SlotPitch<1) {
NumWalls=NumSlots-1;
SlotPitch=(SlotPitchTotalOuter+SlotDivider)/NumSlots;
SlotWidth=(SlotPitchTotalOuter-(SlotDivider*NumWalls)) /NumSlots;

//SlotDivider=(SlotPitchTotalOuter-(SlotWidth*NumSlots)) /NumWalls;
//SlotPitch=(SlotPitchTotalOuter+SlotWall)/NumSlots;
//}
Slot1X=(L - ((NumSlots-1)*SlotPitch))/2;//centre of 1st slot
SlotT=T-ReedPlateZ*2;

//---- show some messages to console
echo("SlotPitch (calc) is:", SlotPitch, " NumSlots:", NumSlots);
echo("Outer-Distance between outside walls of outer slots (calc) is:", (NumSlots * SlotPitch) - SlotDivider , " given is:",SlotPitchTotalOuter);
echo("Divider between slots (calc) is:", SlotPitch-SlotWidth, "  given:", SlotDivider);
echo("Slot Width (calc) is:", SlotWidth);
if (len(SlotDepths)!=2 && len(SlotDepths)!=NumSlots) {echo("ERROR: SlotDepths has ",len(SlotDepths)," elements not  ",NumSlots);}
//---------------------------
//Main
  if (WhatToShow<=2) {
      Comb();
     //Visualise screws and plates
      if (WhatToShow!=0 && ShowReedPlates) {
          color("gold")
          if (ShowExploded) {
                    translate([0,0,-2*T]) ReedPlates(0,Plates=[-1]);
              translate([0,0,2*T]) ReedPlates(0,Plates=[1]);
                } else {
                    ReedPlates(0);
                }
          }//if
      if (WhatToShow!=0 && ShowScrews) {
          color("red")
            if (ShowExploded) {
                    translate([0,0,4*T])
                        Holes();
                } else {
                    Holes();}
                }

  }
  if (WhatToShow==3) { //2D Slice
      projection(cut = true) translate([0,0,-T/2])Comb();
  }
  if (WhatToShow==4) {
     TestHoles();
  }
//--------------------------
  TestH=3;
  font="Liberation Sans:style=Bold";
  fontsize=6;
 module TestHoles() {
     $fn=16;
     difference() {
        color("green") rcube([20,10,TestH], r=3);
        translate([5,5,-0.1])
            cylinder(r=CoverScrewHoleR+HoleOS/2,h=TestH+1);
        translate([15,5,-0.1])
            cylinder(r=ReedScrewR+HoleOS/2,h=TestH+1);
     }
     color("red") translate([2,12,0])
        linear_extrude(height = 0.5) {
             translate([2.5,0,0]) text(text = str(2*CoverScrewHoleR), font = font, size = fontsize, halign="center");
             translate([12.5,0,0]) text(text = str(2*ReedScrewR), font = font, size = fontsize, halign="center");
     }

     }
 module Comb(){
 difference() {
     color("cyan") union(){
        difference(){
            rcube([L,W,T],r=CornerR); //make the comb block
            //cut out Slots
            translate([0,-0.05,-0.05])
                for (i=[0:NumSlots-1]) { // for each slot
                    translate([Slot1X+ i*SlotPitch,-0.01,0])
                    if (len(SlotDepths)>2) {
                        Slot2(SlotDepths[min(i,len(SlotDepths)-1)]);
                    } else { //start and end values given so interpolate
                        Slot2(i*(SlotDepths[1]-SlotDepths[0])/NumSlots + SlotDepths[0]);
                    }
                }//for
        }//diff
        //now add in the thickened screw hole walls
        Holes(HoleZ=T, HoleZOffset=0, OS=ScrewHoleWall );
    } //union

     //cut Reed plate Recesses
    if (FlushReedPlates!=1) {
        ReedPlates(RecessOversize);
    }
    //cut holes
    Holes();

}//diff
}
module ReedPlates(RecessOversize,Plates=[-1,1]) {
  difference() {
  for (i=Plates) //i=[0,1]
    translate([ReedPlateX1-RecessOversize,
        ReedPlateY1-RecessOversize,
   (T-ReedPlateZ)/2+ i*(T/2-ReedPlateZ/2) + i*ReedPlateZ*FlushReedPlates -0.05])
 //       i*(T-ReedPlateZ) -0.05])
        rcube([ReedPlateX+2*RecessOversize,        ReedPlateY+2*RecessOversize,
            ReedPlateZ+0.1],r=ReedPlateR);
    Holes();
      }//diff
    }

//HoleZOffset=ReedPlateZ+1;
//HoleZ=T+2*HoleZOffset;

module Holes( HoleZOffset=ReedPlateZ+1, HoleZ=T+2*(ReedPlateZ+1), OS=HoleOS/2 ) {
    $fn=16;
    translate([0,0,-HoleZOffset]) {
    //Cover Holes
    for (i=[0,1]) {
        translate([CoverHoleX+ CoverHolePitch*i,CoverHoleY,0])
        cylinder(r=CoverScrewHoleR+OS,h=HoleZ);
    }//for

    //ReedPlateScrews
    for (i=[0:NumReedScrews-1]) {
        translate([0,0,-0.1])
        translate(ReedScrewPos[i]+[ReedPlateX1,ReedPlateY1]+[ReedPlateScrewHoleD/2,ReedPlateScrewHoleD/2])
        cylinder(r=ReedScrewR+OS,h=HoleZ);
        }//for
     for (i=[0:NumReedScrews2-1]) {
        translate([0,0,-0.1])
        translate(ReedScrewPos2[i]+[ReedPlateX1,ReedPlateY1]+[ReedPlateScrewHoleD2/2,ReedPlateScrewHoleD2/2])
        cylinder(r=ReedScrewR2+OS,h=HoleZ);
        }//for

    }
    }
module rcube(size, r) {
    translate(size/2){
        cube(size - [2*r,0,0], true);
        cube(size - [0,2*r,0], true);
        for (x = [r-size[0]/2, -r+size[0]/2],  y = [r-size[1]/2, -r+size[1]/2]) {
            translate([x,y,0]) cylinder(r=r, h=size[2], center=true);
            }
    }
}
module Fillet(r,h=T+0.2, $fn=16){
    difference(){
            translate([-r,0,0]) cube([r,r,h]); //make a cube of 1 quarter sector
            translate([-r,r,-0.01])
                cylinder(r=r,h=h+0.2); //cube cylinder out of it
        }
    }

module Slot2(SlotDepth){ //switch if full slots
    if ((FullSlots==1) || FlushReedPlates || (ReedPlateZ<0.1)) {
        Slot(SlotDepth, H=T+0.1);
    } else {
        translate([0,0,ReedPlateZ])
            Slot(SlotDepth,H=SlotT);
    }
    }
//module Fillet2(){Fillet(r=SlotInnerR, h=9+0.2);}
module Slot(SlotDepth, H) {
    difference() {
        translate([-SlotWidth/2,0,0])
            cube([SlotWidth,SlotDepth,H+0.1]);
        translate([0,SlotDepth,-0.05])
            for (i=[0,1]) mirror([-i,0,0])
                translate([-SlotWidth/2-0.1,0.1,0])
                    rotate([0,0,180])
                       Fillet(r=SlotInnerR, h=H+0.2);
    }
    //Outer face radius vertical
    for (i=[0,1])
       //translate([0,SlotR/2])
        mirror([i,0,0])
            translate([-SlotWidth/2,0,-SlotR/2])           Fillet(r=SlotR, h=H+SlotR);
    //Outer face radius horizontal
    for (i=[0,1])
       translate([SlotWidth/2 +SlotR/2,0,H/2])
        mirror([0,0,i])
            translate([0,0,-H/2])
    rotate([0,-90,0])
                Fillet(r=SlotR, h=SlotWidth+SlotR);
    }//diff

```


[User]
I'd like to design a wall-mounted screwdriver holder, similar to the one I saw on Thingiverse (thing:1044733) but tweaked to be more suitable for my needs.

Essentially, it will be a grid of cylindrical tubes to hold the screwdrivers, mounted on a base that also provides wall mounting points. I want to be able to specify the number of rows and columns of screwdrivers. I also need to set the height of the tubes and their inner diameter, which will depend on my screwdrivers. Finally, I'd like to specify mounting holes for screws at the top and bottom of the back plate.

Specifically, here's what I'm looking for:

*   **Adjustable Grid:** The design should have parameters for the number of rows and columns of screwdriver tubes.
*   **Tube Dimensions:**  I need to be able to control the inner diameter of the tubes, as well as their height. This needs to include an outer diameter for spacing and appearance.
*   **Base Plate:** The tubes should all sit on a thin, rectangular base.
*   **Wall Mounts:**  A vertical wall mount should be attached to the back of the base. This wall mount should have mounting holes at the top and bottom for securely fastening to the wall with screws.
*   **Customizable Hole Diameter:** I want the design to include parameters to customize the mounting hole diameter.

I would like you to generate a parametric OpenSCAD file or files that will allow me to customize these parameters. I don't need any specific libraries as long as the design works.

[Assistant]
wall_screwdriver_holder.scad:
```
// Customizable screw driver stand top
// Created by Kjell Kernen
// Date 30.9.2015

/*[Pattern Parameters]*/
// of screw drivers:
rows=3;       // [2:5]

// of screw drivers per row:
number=4;     // [2:6]

// of the stand in mm:
height=30;    // [15:50]

// of the screw driver tubes in mm:
inner_diameter=14;  // [10:40]

// in mm:
hole_diameter=7;  // [4:10]

/*[Hidden]*/
diameter = inner_diameter+1;
/* Modules */

module tube(height,width)
{
	difference()
	{
		cylinder(r=(width/2),    h=height);
		translate([0,0,-1])
           cylinder(r=(width/2 -1), h=height+2);
	}
}

// Drawing starts here ********************************************

//Base
difference()
{
    translate([-diameter/2,-diameter/2,0])
        cube([rows*(diameter-1)+1,number*(diameter-1)+1,2]);
    for (xi=[0:1:rows-1])
        for(yi=[0:1:number-1])
            translate([xi*(diameter-1),yi*(diameter-1),-1])
                cylinder( d2=inner_diameter, d1=hole_diameter, h=3.5);
}

//Wall
difference()
{
    translate([-diameter/2-1,-diameter/2,0])
        cube([2,number*(diameter-1)+1,height+15]);
    union()
    {
        translate([-diameter/2-2, diameter/2, height + 7.5])
            rotate([0,90,0])
                cylinder(h=4, d=4);
        translate([-diameter/2-2, diameter/2 +((diameter-1)*(number-2)) , height + 7.5])
            rotate([0,90,0])
                cylinder(h=4, d=4);
    }
}

//Tubes
for (xi=[0:1:rows-1])
    for(yi=[0:1:number-1])
        translate([xi*(diameter-1),yi*(diameter-1),0])
            tube (height, diameter);

```


[User]
I need a parametric fan generator in OpenSCAD. I've seen a couple of versions floating around, but I want one that's a little more flexible and robust. Here are the key parameters I'd like to control:

*   **Fan dimensions:** I need to be able to specify the overall width/length of the square fan housing (e.g., 60mm, 120mm). And also the overall thickness or height of the fan.
*   **Mounting tabs:** The tabs used for mounting the fan need to be parametrically designed. I'd like to be able to define the thickness of these as a *ratio* of the overall fan thickness, since the thickness of these mounting tabs shouldn't be a fixed value.
*   **Fan blades:**
    *   I need to define how many blades the fan has.
    *   The direction of the blades' twist (clockwise or counter-clockwise).
    *   The *amount* of twist. This also should be a ratio - perhaps a fraction of a full rotation.
    *   The thickness of the blades themselves.
    *   The gap between the edge of the blades and the housing wall.
*   **Hub:** I want to control the ratio of the hub diameter to the overall housing diameter.
*   **Mounting holes:** I need to be able to specify the diameter of the mounting holes for different size metric screws. I'd like to include the following options: M1, M1.2, M1.6, M2, M2.5, M3, M4, M5, M6, and M8.
*   **Quality:** I need to be able to control the quality of the rendering, with a low setting for configuring the design and high for final outputs.

I'm looking for a single `.scad` file that includes all of this as parameters. I do not want to require any external libraries, but I would like all parameters to have default values, and to be grouped in the customizer. I expect there to be some automatically-computed, hidden parameters as well - the inner diameter, corner radii, and the offset for the mounting holes based on the side lengths.

So, to reiterate, I need one `.scad` file that contains all of the parameters I specified, along with reasonable defaults and groups.  Can you generate that for me?

[Assistant]
Fan_parametric_v1.scad:
```
// Parametric fan design by Jason Frazier (neveroddoreven)
// Remixed from non-parametric design by MiseryBot at http://www.thingiverse.com/thing:8063
// Case size selections inspired by https://en.wikipedia.org/wiki/Computer_fan

//=======================================================================================
/* [Global] */
// Low quality for configuring, High for final output
$fn=60; // [60:Low Quality,720:High Quality]
// Fan length/width in mm
housing_side=60; // [8,17,20,25,30,35,38,40,45,50,60,70,80,90,92,100,110,120,130,140,150,250,360]
// Fan thickness in mm
housing_height=25; // [3,5,7,10,15,20,25,30,38]
// Default 0.144, adjust based on housing size
housing_mount_tab_thickness_ratio=0.144; // [0.1,0.12,0.144,0.2,0.25]
// Default 7
fan_blade_count=7; // [1,2,3,4,5,6,7,8,9,10,11,12,13,15,17,19]
// Default counter-clockwise
fan_blade_direction=-1; // [-1:Counter-clockwise, 1:Clockwise]
// Default 0.58
fan_blade_twist_ratio=0.58; // [0.145,0.29,0.435,0.58,0.725,0.87,1.015,1.16,1.305,1.45]
// Default 1.5
fan_blade_thickness=1.5; // [0.5,0.75,1.0,1.5,2.0]
// Default 0.75
fan_blade_edge_gap=0.75; // [0.25,0.5,0.75,1]
// Default 0.525
hub_diameter_to_housing_ratio=0.525; // [0.15,0.275,0.4,0.525,0.65,0.775,0.9]
// Default 3.4 for an M3 screw, these values are a made-up WIP
mount_hole_diameter=3.4; // [1.1:M1, 1.4:M1.2, 1.8:M1.6, 2.3:M2, 2.8:M2.5, 3.4:M3, 4.5:M4, 5.5:M5, 6.5:M6, 8.5:M8]

/* [Hidden] */
// leave these be unless you know what you're doing
housing_inner_diameter=housing_side*0.95;
housing_corner_radii1=housing_side*0.081667;
housing_corner_radii2=housing_side*0.083333;
housing_corner_radii3=housing_side*0.085;
housing_corner_radii4=housing_side*0.001667;
housing_outer_diameter=housing_side*1.066667;
housing_mount_tab_thickness=housing_height*housing_mount_tab_thickness_ratio;
hub_diameter=housing_side*hub_diameter_to_housing_ratio;
mount_hole_offset=housing_side*0.416667;
fan_blade_recess=0.5;
fan_blade_twist=360/fan_blade_count*fan_blade_twist_ratio;

module fan_parametric()
  {
  difference()
    {
    linear_extrude(height=housing_height, center = true, convexity = 4, twist = 0)
      difference()
        {
        //overall outside
        square([housing_side,housing_side],center=true);
        //main inside bore, less hub
        difference()
          {
          circle(r=housing_inner_diameter/2,center=true);
          //hub. Just imagine the blades, OK?
          circle(r=hub_diameter/2,center=true);
          }
        //Mounting holes
        translate([mount_hole_offset,mount_hole_offset]) circle(r=mount_hole_diameter/2,h=mount_hole_offset+0.2,center=true);
        translate([mount_hole_offset,-mount_hole_offset]) circle(r=mount_hole_diameter/2,h=mount_hole_offset+0.2,center=true);
        translate([-mount_hole_offset,mount_hole_offset]) circle(r=mount_hole_diameter/2,h=mount_hole_offset+0.2,center=true);
        translate([-mount_hole_offset,-mount_hole_offset]) circle(r=mount_hole_diameter/2,h=mount_hole_offset+0.2,center=true);
        //Outside Radii
        translate([housing_side/2,housing_side/2]) difference()
          {
          translate([-housing_corner_radii1,-housing_corner_radii1]) square([housing_corner_radii3,housing_corner_radii3]);
          translate([-housing_corner_radii2,-housing_corner_radii2]) circle(r=housing_corner_radii2);
          }
        translate([housing_side/2,-housing_side/2]) difference()
          {
          translate([-housing_corner_radii1,-housing_corner_radii4]) square([housing_corner_radii3,housing_corner_radii3]);
          translate([-housing_corner_radii2,housing_corner_radii2]) circle(r=housing_corner_radii2);
          }
        translate([-housing_side/2,housing_side/2]) difference()
          {
          translate([-housing_corner_radii4,-housing_corner_radii1]) square([housing_corner_radii3,housing_corner_radii3]);
          translate([housing_corner_radii2,-housing_corner_radii2]) circle(r=housing_corner_radii2);
          }
        translate([-housing_side/2,-housing_side/2]) difference()
          {
          translate([-housing_corner_radii4,-housing_corner_radii4]) square([housing_corner_radii2+housing_corner_radii4,housing_corner_radii2+housing_corner_radii4]);
          translate([housing_corner_radii2,housing_corner_radii2]) circle(r=housing_corner_radii2);
          }
      } //linear extrude and 2-d difference
    //Remove outside ring
    difference()
      {
      cylinder(r=housing_outer_diameter,h=housing_height-housing_mount_tab_thickness-housing_mount_tab_thickness,center=true);
      cylinder(r=housing_outer_diameter/2,h=housing_height-housing_mount_tab_thickness-housing_mount_tab_thickness+0.2,center=true);
      }
    }// 3-d difference

    //Blades
    linear_extrude(height=housing_height-(fan_blade_recess*2), center = true, convexity = 4, twist = fan_blade_twist*fan_blade_direction)
      for(i=[0:fan_blade_count-1])
        rotate((360*i)/fan_blade_count)
          translate([0,-1.5/2]) #square([housing_inner_diameter/2-fan_blade_edge_gap,fan_blade_thickness]);
  }
//=======================================================================================
fan_parametric();
//=======================================================================================

```


[User]
I'd like to design a modular, stackable rack for Raspberry Pi B+ or B models, and I need some help generating the OpenSCAD files for it.

Here's what I'm thinking:

*   **Basic Structure:** The base of each rack should be a rectangular platform with rounded corners. I'd like to be able to control the radius of those corners as a parameter. The basic size should be 85mm x 56mm, and the thickness of the base platform should be 2mm.

*   **Standoffs or Poles:** Each rack should have the option to include standoffs for mounting a Raspberry Pi. There should be four standoffs, placed at the four corners of where the pi would sit (3.5mm from each edge). These standoffs should be 3mm tall, with small diameter recesses for the Pi mounting holes. Alternatively, instead of standoffs for mounting a Pi to, I would like the option to generate tall poles on top of the base, these poles should be 2mm in diameter and should have a base that is 4mm in diameter, and 3mm tall. The length of the poles should be customizable, and the poles should start 3mm above the base, and they should align with the standoffs. If the poles are enabled, the standoffs should be disabled.

*   **Stacking:** I would like the poles to allow racks to be stacked on top of each other.

*   **Ventilation:** I'd like to have an optional vent on the bottom of the base. The vent should be a circular pattern with a few concentric rings and cross-shaped cutouts. I can provide more detail about the vent's dimensions if needed, or you can make something that looks nice.

*   **Customization:** I need to control several parameters such as:
    *   Whether to generate stacking poles.
    *   The height of the stacking poles.
    *   Whether to generate a ventilation hole.
    *   Whether to generate standoffs for mounting the Raspberry Pi.
    *   The radius of the corners of the base.

I'm looking for a parametric design that I can easily modify and customize in the future, and I'm happy to have you generate the files from scratch as this design is somewhat bespoke. It would be fantastic if you could generate one main .scad file that handles the bulk of the design and lets me customize those parameters.

I'm not looking for any specific libraries to be used, other than the default OpenSCAD library, but would welcome any recommendations you have.

[Assistant]
Raspberry_pi_rack.scad:
```
/*Customizer Variables*/
/* [All] */

// Generate poles to stack another rack on top?
poles = 0; // [1:Yes,0:No]

// Height of poles in mm (not counting standoffs); the raspberry pi B+ is about 15mm tall.
poleheight = 16.5; // [15.5:0.5:25]

// Generate a vent on the bottom of the rack?
vented = 1; // [1:Yes,0:No]

// Generate standoffs to mount a pi? Overrides poles option. (Disable for a top cover)
standoffs = 1; // [1:Yes,0:No]

// Radius of the corners of the base - 0 will produce non-rounded corners.
corner_radius = 3; // [0:0.5:6]

/***********
*  Don't   *
*  Touch!  *
***********/

/* [Hidden] */

$fn=64;

x=85;
y=56;
thickness=2;
offsetheight=3;

module pole(x,y,height=0) {
	translate([x,y,thickness]) {
		cylinder(offsetheight,d=4);
		translate([0,0,offsetheight])
			cylinder(2+height,d=2.5);
	}

}

module indent(x,y,depth=thickness/2) {
	translate([x,y,-0.01])
		// translated down Z to prevent Z fighting in preview
		cylinder(depth+0.01,d=2.75);
}

module vent(x,y) {
	translate([x,y,-0.01]) {
		// translated down Z to prevent Z fighting in preview
		rotate([0,0,45]){
			difference() {
				union() {
					difference() {
						cylinder(thickness+0.02,d=26);
						cylinder(thickness+0.02,d=22);
					}
					difference() {
						cylinder(thickness+0.02,d=18);
						cylinder(thickness+0.02,d=14);
					}
					difference() {
						cylinder(thickness+0.02,d=10);
					}
				}
				translate([-25,-1,-0.01])
					cube([50,2,thickness+0.02]);
				translate([-1,-25,-0.01])
					cube([2,50,thickness+0.02]);
			}
		}
	}
}

module roundedcube(x, y, z, r) {
	if (r == 0) {
		cube([x,y,z]);
	} else {
		hull() {
			translate([r,r,0]) cylinder(z,r=r);
			translate([x-r,r,0]) cylinder(z,r=r);
			translate([r,y-r,0]) cylinder(z,r=r);
			translate([x-r,y-r,0]) cylinder(z,r=r);
		}
	}
}

difference() {
	union() {
		roundedcube(x,y,thickness,corner_radius);
		if (poles) {
			if (standoffs) {
				pole(3.5,3.5,poleheight);
				pole(3.5,y-3.5,poleheight);
				pole(x-23.5,3.5,poleheight);
				pole(x-23.5,y-3.5,poleheight);
			}
		} else {
			if (standoffs) {
				pole(3.5,3.5);
				pole(3.5,y-3.5);
				pole(x-23.5,3.5);
				pole(x-23.5,y-3.5);
			}
		}
	}
	indent(3.5,3.5);
	indent(3.5,y-3.5);
	indent(x-23.5,3.5);
	indent(x-23.5,y-3.5);
	if (vented)
		vent((x-23.5)/2,y/2);
}
```


[User]
Hi, I'm looking for some help creating a customizable case for the C.H.I.P. single-board computer. I've seen some examples online, but I'd like to design my own with more options.

The basic case should be a rectangular box, sized to fit the board, with adjustable wall thickness. The external dimensions need to be customizable, as well as openings for certain things. Here's what I need to be able to configure:

*   **Board Dimensions:** I need to be able to specify the length, width, and height of the board.
*   **Wall Thickness:** The thickness of the case walls should be a configurable parameter.
*   **Profile:** I need a few different profile options: standard, low-profile, and a "snap" case design. The low-profile should reduce the overall height and require different placement of board supports. The "snap" profile should have gaps between the sides and front of the case, as well as the USB opening.
*   **Header Openings:** I need to be able to add openings on the left and/or right sides of the case for header access.
*   **Battery Opening:** I need a way to add an opening for a battery connector.
*   **Button Opening:** I should be able to add an opening for the reset button.
*   **PCB Screw Holes:** Openings for screw holes used to mount the PCB should be configurable.
*   **Screw Mounts:** I need to be able to add screw mounts to the sides of the case.
*   **VESA Mount:** I'd like the option to add a VESA mount to the back of the case.
*   **BitBeam:** I need to be able to add bitbeam mounting points to the sides and/or back of the case. It should use the bitbeam standard.
*   **Building Bricks:**  I also want to be able to add building brick mounting points (like Lego) to the sides and/or back of the case. This should use the given brick standard.
*   **Case Parts:** I should be able to choose whether to print the bottom, sides, and front of the case or not.

I understand that the BitBeam and Universal Brick Builder components are available and that I can use those as starting points for that part of the design. I don't need those created from scratch. I should be able to select all the different options as well as board dimensions and wall thickness, for the case, mount points, and beam and brick attachments.

[Assistant]
CHIPbag.scad:
```
// CHIPbag
// by Tom Owad 2015 (CC BY-NC 3.0)
// www.applefritter.com

// The following modules are included, unchanged from their 10/3/15 versions:
// BitBeam by Jason Huggins: http://bitbeam.org/
// Universal brick builder module by Jorg Janssen: http://www.thingiverse.com/thing:178627

//make opening for battery (always true when low profile)
battery = 0; // [0:No, 1:Yes]

//make opening for header on left (always true when low profile)
left_header = 0; // [0:No, 1:Yes]

//make opening for header on right (always true when low profile)
right_header = 0; // [0:No, 1:Yes]

//make opening for reset button
reset = 0; // [0:No, 1:Yes]

//make opening for top screw on PCB
top_screw = 0; // [0:No, 1:Yes]

//make opening for bottom left hole on PCB
left_screw = 0;  // [0:No, 1:Yes]

//make opening for bottom right hole on PCB
right_screw = 0; // [0:No, 1:Yes]

//add screw mounts to sides
screw_mounts = 0; // [0:No, 1:Yes]

//add vesa mount
vesa = 0; // [0:No, 1:Yes]

//add bitbeam to back
back_beams = 0; // [0:No, 1:Yes]

//add bitbeam to sides
side_beams = 1; // [0:No, 1:Yes]

//add brick bottom to back
back_brick = 0; // [0:No, 1:Yes]

//add bricks to sides
side_brick = 0; // [0:No, 1:Yes]

//makes low profile version. You must also change board_width to 7.5
low_profile = 2; // [0:Standard Profile, 1:Low Profile, 2: Snap]

//y - 12.5 for standard; 5.5 for low profile, 10.75 for snap case
board_width = 10.75;

//x 42.25 for tinyboy
board_length = 42;

//z
board_height = 61;

//wall thickness
wall = 1.75;

//header dimensions
header_height = 52;
header_width = 6.5;

//Print bottom?
bottom_on = 1; // [0:No, 1:Yes]

//Print sides?
sides_on = 1; // [0:No, 1:Yes]

//Print front?
front_on = 1; // [0:No, 1:Yes]

//number of bitbeam holes on sides
beam_height_count = 8;

$fn=150;

module bag() {

    //base
    translate([0,0,0])
        cube([board_length+wall*2, board_width+wall*2, wall], center=false);

    //front wall
    translate([0,0,wall])
        cube([board_length+wall*2, wall, board_height], center=false);

    //back wall
    translate([0,board_width+wall,wall])
        cube([board_length+wall*2, wall, board_height], center=false);

    //left wall
    translate([0,wall,wall])
        cube([wall, board_width, board_height], center=false);

    //right wall
    translate([board_length+wall,wall,wall])
        cube([wall, board_width, board_height], center=false);

    //add bumps to support back of board and front
    if (low_profile == 2) {
        //back bumps - tried 1.5 for even fit with no bumps in front; 2 for bumps in front
        translate([wall+6, board_width+wall-2, wall])
            cube([13, 2, 6]);
        translate([wall+27, board_width+wall-2, wall])
            cube([10, 2, 6]);
        //front bumps
        translate([wall, board_width+wall-2, wall+board_height-3])
            cube([board_length, 2, 3]);
    }

}

module subtractions() {

    //left header
    if (left_header == 1 || low_profile >= 1) {
        translate([wall, -1, wall])
            cube([header_width, wall+2, header_height]);
        }

    //right header
    if (right_header == 1 || low_profile >= 1) {
        translate([wall+board_length-header_width, -1, wall])
            cube([header_width, wall+2, header_height]);
        }

    //battery
    if (battery == 1 || low_profile == 1) {
//        translate([30+wall, -1, 40.5+wall]) //Alpha wall
//            cube([7, wall+2, 7.5]);

          translate([29+wall, 3+wall, -10])
            cube([7.5, 6, 20]);
        }

    //low profile
    if (low_profile == 1) {
        translate([wall, -1, 45.9+wall])
            cube([board_length, wall+2, board_height+wall*2]);
    }

    //snap case
    if (low_profile == 2) {
        //make room for usb port on top
        translate([wall+7, -1, wall+board_height-1])
            cube([wall+13, wall+2, 2]);
        translate([wall+7.5, wall-.5, wall+board_height-14.5])
            cube([wall+12, 1, 15]);
        //make a gap between the side walls and the front wall
        translate([wall, -1, wall+header_height-1])
            cube([.5, wall+2, board_height-header_height+2]);
        translate([wall+board_length-.5, -1, wall+header_height-1])
            cube([.5, wall+2, board_height-header_height+2]);
    }

    //reset button
    if (reset == 1) {
        translate([wall+10, -1, wall+3])
            rotate([90,0,0])
                cylinder(h=wall+4, r=1.5, center=true);
    }

    //top PCB screw hole
    if (top_screw == 1) {
        translate([wall+10, -1, wall+42])
            rotate([90,0,0])
                cylinder(h=wall+100, r=1.75, center=true);
    }

    //left PCB screw hole
    if (left_screw == 1) {
        translate([wall+10, -1, wall+10.5])
            rotate([90,0,0])
                cylinder(h=wall+100, r=1.75, center=true);
    }

    //right PCB screw hole
    if (right_screw == 1) {
        translate([wall+32, -1, wall+10.5])
            rotate([90,0,0])
                cylinder(h=wall+100, r=1.75, center=true);
    }

//9mm edge to hole
//3mm hole diameter
//8mm edge to edge of hole
//9.5mm to center of hole
//9mm bottom edge to edge of hole
}

module screw_mounts() {

    //lower left mount
    difference() {
     translate([-12, board_width+wall, 0])
        cube([12, wall, 12]);
     translate([-6, board_width+wall-1, 6])
            rotate([90,0,0]){
         cylinder(h=wall+4, r=2.25, center=true);
        }
    }

    //lower right mount
    difference() {
     translate([board_length+wall*2, board_width+wall, 0])
        cube([12, wall, 12]);
     translate([board_length+wall*2+6, board_width+wall-1, 6])
            rotate([90,0,0]){
         cylinder(h=wall+4, r=2.25, center=true);
        }
    }

    //upper left mount
    difference() {
     translate([-12, board_width+wall, board_height+wall-12])
        cube([12, wall, 12]);
     translate([-6, board_width+wall-1, board_height+wall-6])
            rotate([90,0,0]){
         cylinder(h=wall+4, r=2.25, center=true);
        }
    }

    //upper right mount
    difference() {
     translate([board_length+wall*2, board_width+wall, board_height+wall-12])
        cube([12, wall, 12]);
     translate([board_length+wall*2+6, board_width+wall-1, board_height+wall-6])
            rotate([90,0,0]){
         cylinder(h=wall+4, r=2.25, center=true);
        }
    }

}

module back_beams() {

    //bottom bitbeam
    translate([((board_length+wall*2)-(beam_width*5))/2, board_width+wall*2, 0])
        beam(5);

    //top bitbeam
    translate([((board_length+wall*2)-(beam_width*5))/2, board_width+wall*2, board_height+wall-beam_width])
        beam(5);

}

module side_beams() {

    difference() {
        union() {

            //left bitbeam
            translate([0-((beam_width*6)-(board_length+wall*2))/2, board_width+wall*2-beam_width,(board_height+wall)-(beam_width*beam_height_count)])
                rotate([0,-90,0])
                    beam(beam_height_count);

            //right bitbeam
           translate([(board_length+wall*2+beam_width)+((beam_width*6)-(board_length+wall*2))/2,board_width+wall*2-beam_width,(board_height+wall)-(beam_width*beam_height_count)])
                rotate([0,-90,0])
                    beam(beam_height_count);

            //add extension to connect right bitbeam
            translate([board_length+wall*2-.01, board_width+wall*2-beam_width, (board_height+wall)-(beam_width*8)])
                cube([((beam_width*6)-(board_length+wall*2))/2+.02, beam_width, beam_width*8]);
            //added the .01 due to invalid 2-manifold warning

            //add extension to connect left bitbeam
            translate([0-((beam_width*6)-(board_length+wall*2))/2-.01, board_width+wall*2-beam_width, (board_height+wall)-(beam_width*8)])
                cube([((beam_width*6)-(board_length+wall*2))/2+.02, beam_width, beam_width*8]);

            //extend base to alight with bitbeam
            translate([0,0,(board_height+wall)-(beam_width*beam_height_count)])
                cube([board_length+wall*2, board_width+wall*2, (beam_width*8)-(board_height+wall)], center=false);
                }

    //hack to make battery work
    if (battery == 1 || low_profile == 1) {

          translate([29+wall, 3+wall, -10])
            cube([7.5, 6, 20]);
        }
    }

}

module back_brick() {

    translate([((board_length+wall*2)-39.8)/2,board_width+wall*2+3.2, 0])
        rotate([90,0,0])
            brick(5,8,1);

}

module side_brick() {

    translate([1,0,0])
        rotate([0,-90,0])
            brick(8,2,1);

    translate([board_length+wall*2+3.2, 0, 0])
            rotate([0,-90,0])
                brick(8,2,1);

}

// Description: "Technic-compatible gridbeam"
// Project home: http://bitbeam.org

// Each bitbeam is 8mm inches wide.
// Center of each hole is 8mm apart from each other
// Holes are 5.1 mm in diameter.

// Mini
//beam_width     = 4;
//hole_diameter  = 2.2;

// Standard
beam_width     = 8;
hole_diameter  = 5.1;

hole_radius    = hole_diameter / 2;

module beam(number_of_holes) {
    beam_length = number_of_holes * beam_width;
    difference() {
        // Draw the beam...
        cube([beam_length,beam_width,beam_width]);

        // Cut the holes...
        for (x=[beam_width/2 : beam_width : beam_length]) {
            translate([x,beam_width/2,-2])
            cylinder(r=hole_radius, h=12, $fn=30);
        }
        for (x=[beam_width/2 : beam_width : beam_length]) {
            rotate([90,0,0])
            translate([x,beam_width/2,-10])
            cylinder(r=hole_radius, h=12, $fn=30);
        }

        // Optional through-hole
        //rotate([0,90,0])
        //translate([-4,beam_width/2,-2])
        //cylinder(r=hole_radius, h=number_of_holes*beam_width+4, $fn=30);
        }
}

/*

 Basic brick builder module for OpenScad by Jorg Janssen 2013 (CC BY-NC 3.0)
 To use this in your own projects add:

 use <path_to_this_file/brick_builder.scad>
 brick (length, width, height [,smooth]);

 Length and width are in standard brick dimensions.
 Height is in flat brick heights, so for a normal brick height = 3.
 Add optional smooth = true for a brick without studs.
 Use height = 0 to just put studs/knobs on top of other things.

 */

 // this is it:

// and this is how it's done:

FLU = 1.6; // Fundamental Unit = 1.6 mm

BRICK_WIDTH = 5*FLU; // basic brick width
BRICK_HEIGHT = 6*FLU; // basic brick height
PLATE_HEIGHT = 2*FLU; // basic plate height
WALL_THICKNESS = FLU; // outer wall of the brick
STUD_RADIUS = 1.5*FLU; // studs are the small cylinders on top of the brick with the logo ('nopje' in Dutch)
STUD_HEIGHT = FLU;
ANTI_STUD_RADIUS = 0.5*4.07*FLU;  // an anti stud is the hollow cylinder inside bricks that have length > 1 and width > 1
PIN_RADIUS = FLU; // a pin is the small cylinder inside bricks that have length = 1 or width = 1
SUPPORT_THICKNESS = 0.254; // support is the thin surface between anti studs, pins and walls, your printer might not print this thin, try thicker!
EDGE = 0.254; // this is the width and height of the bottom line edge of smooth bricks
CORRECTION = 0.1; // addition to each size, to make sure all parts connect by moving them a little inside each other

module brick(length = 4, width = 2, height = 3, smooth = false){

	// brick shell
	difference(){
		cube(size = [length*BRICK_WIDTH,width*BRICK_WIDTH,height*PLATE_HEIGHT]);
		translate([WALL_THICKNESS,WALL_THICKNESS,-WALL_THICKNESS])
		union(){
			cube(size = [length*BRICK_WIDTH-2*WALL_THICKNESS,width*BRICK_WIDTH-2*WALL_THICKNESS,height*PLATE_HEIGHT]);
			// stud inner holes, radius = pin radius
			if (!smooth) {
				translate([STUD_RADIUS+WALL_THICKNESS,STUD_RADIUS+WALL_THICKNESS,height*PLATE_HEIGHT])
				for (y = [0:width-1]){
					for (x = [0:length-1]){
						translate ([x*BRICK_WIDTH-WALL_THICKNESS,y*BRICK_WIDTH-WALL_THICKNESS,-CORRECTION])
						cylinder(h=WALL_THICKNESS+2*CORRECTION,r=PIN_RADIUS);
					}
				}
			}
			// small bottom line edge for smooth bricks
			else {
				translate([-WALL_THICKNESS-CORRECTION,-WALL_THICKNESS-CORRECTION,FLU-CORRECTION])
				difference() {
					cube([length*BRICK_WIDTH+2*CORRECTION,width*BRICK_WIDTH+2*CORRECTION,EDGE+CORRECTION]);
					translate([EDGE+CORRECTION,EDGE+CORRECTION,-CORRECTION])
					cube([length*BRICK_WIDTH-2*EDGE,width*BRICK_WIDTH-2*EDGE,EDGE+3*CORRECTION]);
				}
			}
		}
	}
	// Studs
	if(!smooth){
		translate([STUD_RADIUS+WALL_THICKNESS,STUD_RADIUS+WALL_THICKNESS,height*PLATE_HEIGHT])
		for (y = [0:width-1]){
			for (x = [0:length-1]){
				translate ([x*BRICK_WIDTH,y*BRICK_WIDTH,-CORRECTION])
				difference(){
					cylinder(h=STUD_HEIGHT+CORRECTION, r=STUD_RADIUS);
					// Stud inner holes
					translate([0,0,-CORRECTION])
					cylinder(h=0.5*STUD_HEIGHT+CORRECTION,r=PIN_RADIUS);
				}
				// tech logo - disable this if your printer isn't capable of printing this small
				if ( length > width){
					translate([x*BRICK_WIDTH+0.8,y*BRICK_WIDTH-1.9,STUD_HEIGHT-CORRECTION])
					resize([1.2*1.7,2.2*1.7,0.254+CORRECTION])
					rotate(a=[0,0,90])
					import("tech.stl");
				}
				else {
					translate([x*BRICK_WIDTH-1.9,y*BRICK_WIDTH-0.8,STUD_HEIGHT-CORRECTION])
					resize([2.2*1.7,1.2*1.7,0.254+CORRECTION])
					import("tech.stl");
				}
				/*
				// Alternative 2-square logo
				translate ([x*BRICK_WIDTH+CORRECTION,y*BRICK_WIDTH-CORRECTION,STUD_HEIGHT-CORRECTION])
				cube([1,1,2*CORRECTION]);
				translate ([x*BRICK_WIDTH-0.9,y*BRICK_WIDTH-0.9,STUD_HEIGHT-CORRECTION])
				cube([1,1,0.3]);
				*/
			}
		}
	}
	// Pins x
	if (width == 1 && length > 1) {
			for (x = [1:length-1]){
				translate([x*BRICK_WIDTH,0.5*BRICK_WIDTH,0])
				cylinder(h=height*PLATE_HEIGHT-WALL_THICKNESS+CORRECTION,r=PIN_RADIUS);
				// Supports
				if (height > 1) {
				translate([x*BRICK_WIDTH-0.5*SUPPORT_THICKNESS,CORRECTION,STUD_HEIGHT])
				cube(size=[SUPPORT_THICKNESS,BRICK_WIDTH-2*CORRECTION,height*PLATE_HEIGHT-STUD_HEIGHT-WALL_THICKNESS+CORRECTION]);
			}
		}
	}
	// Pins y
	if (length == 1 && width > 1) {
			for (y = [1:width-1]){
			translate([0.5*BRICK_WIDTH,y*BRICK_WIDTH,0])
			cylinder(h=height*PLATE_HEIGHT-WALL_THICKNESS+CORRECTION,r=PIN_RADIUS);
			// Supports
			if (height > 1) {
			translate([CORRECTION,y*BRICK_WIDTH-0.5*SUPPORT_THICKNESS,STUD_HEIGHT])
			cube(size=[BRICK_WIDTH-2*CORRECTION,SUPPORT_THICKNESS,height*PLATE_HEIGHT-STUD_HEIGHT-WALL_THICKNESS+CORRECTION]);}

		}
	}
	// Anti Studs
	if (width > 1 && length > 1){
		difference(){
			union(){
				for(y = [1:width-1]){
					for(x = [1:length-1]){
						// anti studs
						translate([x*BRICK_WIDTH,y*BRICK_WIDTH,0])
						cylinder (h=height*PLATE_HEIGHT-WALL_THICKNESS+CORRECTION, r = ANTI_STUD_RADIUS);
						// Supports
						if (height > 1){
							// Support x
							if (x%2 == 0 && (length%2 == 0 || length%4 == 1 && x<length/2 || length%4 == 3 && x>length/2) || x%2 == 1 && (length%4 == 3 && x<length/2 || length%4 == 1 && x>length/2)) {
								translate([BRICK_WIDTH*x-0.5*SUPPORT_THICKNESS,y*BRICK_WIDTH-BRICK_WIDTH+WALL_THICKNESS-CORRECTION,STUD_HEIGHT])
								cube(size=[SUPPORT_THICKNESS,2*BRICK_WIDTH-2*WALL_THICKNESS,height*PLATE_HEIGHT-STUD_HEIGHT-WALL_THICKNESS+CORRECTION]);
							}
							// Supports y
							if (y%2 == 0 && (width%2 == 0 || width%4 == 1 && y<width/2 || width%4 == 3 && y>width/2) || y%2 == 1 && (width%4 == 3 && y<width/2 || width%4 == 1 && y>width/2)) {
								translate([x*BRICK_WIDTH-BRICK_WIDTH+WALL_THICKNESS-CORRECTION,BRICK_WIDTH*y-0.5*SUPPORT_THICKNESS,STUD_HEIGHT])
								cube(size=[2*BRICK_WIDTH-2*WALL_THICKNESS,SUPPORT_THICKNESS,height*PLATE_HEIGHT-STUD_HEIGHT-WALL_THICKNESS+CORRECTION]);
							}
						}
					}
				}
			}
			union(){
				for(y = [1:width-1]){
					for(x = [1:length-1]){
						// hollow anti studs
						translate([x*BRICK_WIDTH,y*BRICK_WIDTH,-WALL_THICKNESS])
						cylinder (h=height*PLATE_HEIGHT, r = STUD_RADIUS);
					}
				}
			}
		}
	}
}

difference() {
    bag();
    subtractions();
}

if (screw_mounts == 1)
    screw_mounts();
if (back_beams == 1)
    back_beams();
if (side_beams == 1)
    side_beams();
if (back_brick == 1)
    back_brick();
if (side_brick == 1)
    side_brick();
```


[User]
I'd like to create a parametric OpenSCAD model that visualizes the integral of a square root function, and I want to be able to customize the rotation and subtraction of a second square root function.

Here's what I'm thinking:

*   **Core Shape:** The base shape should be a 3D representation of rotating the graph of the square root function around a horizontal axis. The user needs to control how large the root function gets.
*   **Axis of Rotation:** The user should be able to adjust the position of the axis of rotation (the x-axis in this case). The axis can be either below the root function, above it, or even within the root function. Think of this like spinning the graph of y=sqrt(x) around different horizontal axes.
*   **Cut Angle:** I need to cut the resulting 3D shape, kind of like taking a slice out of a pie. The user needs to set the angle of this cut.
*   **Secondary Function:** The user will want to create a second square root rotated object, then subtract it from the main one. The user should have control over the activation and size of this. The size of the secondary function should be based on a percentage of the main function. Also, the axis location should adjust based on whether the axis is above or below the main root function and should be automatically adjusted so it appears like an inner slice within the main root object.

Essentially, I'd like to have a main function that takes a primary square root integral and then can have a secondary root integral subtracted from it, each with their own size parameters and rotation angles.

I expect that I'll need to define parameters for:

*   Size of the main square root
*   Location of the axis of rotation (y-value)
*   Position of axis (above or below the function)
*   Cut angle
*   Boolean to activate the secondary function
*   Size of the secondary function

I don't have any existing OpenSCAD code for this, so everything will need to be created from scratch. Make sure you use the proper libraries for this and use a very high granularity in the rotational steps.

[Assistant]
IntegralSqrt.scad:
```
//Size of main square root
Function_Size = 10;//[2:20]

//Location of axis of rotation
Axis = 5;//[0:10]

//Position of axis
Axis_Position = 0;//[0:Below the root function,1: Above the root function]

//Angle that the function is cut at
Cut_Angle = 270; //[90,180,270,360]

//Controls whether a secondary square root is subtracted
Secondary_Function_Active = 1;//[1:on,0:off]

//Size of secondary function as % of full function
Secondary_Function_Size = 50;//[0:10:90]

integralDifference(
    maxVal = Function_Size,
    innerVal = (Secondary_Function_Active==1)?(Function_Size*Secondary_Function_Size/100):0,
    stepsPerUnit=30,
    axisLoc=Axis,
    angle = Cut_Angle,
    above = (Axis_Position==1));

module integralDifference(maxVal = 10, innerVal = 5,stepsPerUnit = 30, axisLoc = 0, angle = 360, above = false){
    difference(){
        3dsqrootPie(maxVal,stepsPerUnit,axisLoc,angle,above);
        translate([0,0,-.01])
        3dsqrootPie(innerVal,stepsPerUnit,above?axisLoc+(sqrt(maxVal)-sqrt(innerVal))+.01:axisLoc,angle,above);
    }
}

module 3dsqrootPie(maxVal = 10, stepsPerUnit = 30, axisLoc = 0, angle = 360, above = false){
    difference(){
        3dsqroot(maxVal,stepsPerUnit,above?-(sqrt(maxVal)+axisLoc+.01):axisLoc);
        translate([0,0,-.01])
        differenceShape(((maxVal+abs(axisLoc))*5),(360-angle));
    }
}

module differenceShape(extents = 10, angle = 180){
    if(angle > 0){
        granularity = angle/10;
        for(i=[0:granularity:angle-granularity]){
            hull(){
                rotate([0,0,i])
                    cube([extents,.1,extents]);
                rotate([0,0,i+granularity])
                    cube([extents,.1,extents]);
            }
        }
    }
}

//3dsqroot(maxVal = 10, axisLoc = 5);
module 3dsqroot(maxVal = 10, stepsPerUnit = 30, axisLoc = 0){
rotate_extrude($fn = stepsPerUnit*maxVal)translate([axisLoc,maxVal])rotate(-90)sqroot(maxVal,stepsPerUnit);
}
module sqroot(maxVal = 10,stepsPerUnit = 100){
    root =
    [for(i = [0:(1/stepsPerUnit):maxVal])[i,sqrt(i)]];
    polygon(concat(root,[[maxVal,0]]));
}
```


[User]
Hey, I'm trying to make a parametric bearing holder, kind of a remix of something I found online, but I want it to be more flexible. I need a OpenSCAD file that can generate a bearing holder with a few adjustable parameters.

Here's what I'm thinking:

1.  **Bearing Dimensions:** I need to be able to specify the inner diameter (rod\_diameter), outer diameter (bearing\_diameter) and width (bearing\_weight) of the bearing. I'll be using standard radial ball bearings, like 606 ZZ (6mm rod, 17mm outer, 6mm wide) or 628 ZZ (8mm rod, 24mm outer, 8mm wide), but I want to be able to specify custom sizes as well.
2.  **Holder Shape:** The main body of the holder should start with a sphere centered at 0,0,0. I need to be able to specify the diameter of this sphere. Then, I need to add a cylindrical extrusion that comes out of the sphere, which will form the main support body of the holder. This cylinder should be centered at the origin and its length and diameter must be adjustable parameters.
3.  **Bearing Cavity:** The bearing should sit within a cutout. This cutout needs to be a cylinder with a diameter equal to the bearing's outer diameter and a height equal to the bearing's width. There also needs to be a clearance cut around that bearing cutout. This clearance should be a rectangular prism around the cylinder with a small offset, also parametrically specifiable, such that it makes the bearing easy to insert. The clearance prism needs to be slightly larger than the bearing to allow the bearing to be inserted into the hole. I need to be able to adjust the offset in a parameter.
4.  **Rod Support:** The rod that goes through the bearing needs a hole with some clearance. This hole should be a cylinder going through the center of the bearing cutout and must be able to accept a rod with a diameter specified in the parameters. I also need a small offset in this parameter.

Finally, I want the whole design to be a difference so that the final shape has the cuts for the bearing and rod. The base sphere and cylinder will form the base, the bearing cavity will be subtracted from that base, and the rod hole will be subtracted from that as well.

Also, I need to be able to specify the resolution of the sphere and cylinder (the `$fn` variable).

Could you generate an OpenSCAD file based on these requirements? It's ok if you use standard libraries for basic shapes. Thanks!

[Assistant]
pershings_ar_gultni_remixed.scad:
```
$fn = 100;

// 606 ZZ
rod_diameter = 6;
bearing_diameter = 17;
bearing_weight = 6;

// 628 ZZ
//rod_diameter = 8;
//bearing_diameter = 24;
//bearing_weight = 8;

difference (){
	union(){
		#import ("pershings_ar_gultni.stl");
		translate ([0, 0, 0]) sphere (d = (31));
		cylinder (30, d = 14);
	}

	cylinder(bearing_weight, d = bearing_diameter);
	translate ([0, 0, -bearing_diameter]) cube ([bearing_diameter *2, bearing_diameter *2, bearing_diameter *2], true);
	translate ([0, 0, bearing_weight + 0.3]) cylinder (30, d = rod_diameter + 1);
}

```


[User]
I'm looking to create a parametric marble caster for a small robot project, and I've got some specific requirements. I've been using this code as a reference but would like to have it be more flexible.

The core of the caster is a cylindrical body with a ball bearing inside. Here's a breakdown of what I need to be adjustable:

*   **deckHeight**: This is the height from the bottom of the chassis to the ground. I need this to be a parameter.
*   **ballDiameter**: The diameter of the ball bearing itself.
*   **ballTolerance**: The clearance between the ball and the housing.
*   **wallThickness**: The thickness of the material around the ball and mounting points.
*  **gapWidth**: A slot to remove the ball is necessary. The width of the slot should be adjustable.
*   **baseThickness**: The thickness of the mounting base.
*   **baseWidth**: The distance between the mounting holes.
*   **M3holeDia**: The diameter for the M3 mounting holes.
*   **M3nutDia**: The diameter for the M3 nut recess (if needed). I need to be able to specify if there will be a counter sink or a nut recess.

The design should include:

*   A cylindrical main body.
*   A spherical cutout for the ball bearing, with the adjustable `ballTolerance`.
*   A removal slot to get the ball in and out
*   Mounting holes for M3 screws, ideally with options for a counter sink or nut recess.
*   The base is mounted to the chassis via screws, and the design should have flat sections for mounting.
*   A slight taper on the top lip to avoid snagging on things.
*   Option for a pedistal base, where it is possible to adjust the platform height.

I'm not too familiar with the best way to structure the code, so I'm open to suggestions. If you think it makes sense to use the `MCAD` library or something else for some of the components, that's fine. I'm aiming for a fully parametric design, so please make all the dimensions adjustable. I'm not sure about the need for any other libraries. It'd be really useful if the main parameters were at the top of the file to make it easy to adjust.

[Assistant]
Caster2.scad:
```
// Original: http://www.thingiverse.com/thing:8959/
// Marble Caster by HipsterLogic

// Modified by 648.ken@gmail.com
// MakersBox.blogspot.com

// Added tapper the top lip to keep it from snagging on things.
// Added recess for screw heads if baseThickness > 3mm
// Added pedistal base so you can adjust platform hieght.

deckHeight = 21;    // from chassis bottom to ground, (must be at lease ballDiameter)
ballDiameter = 16;    // 7/16" ball bearing = 12.25mm, WAS 16.5  16mm = 5/8" ball bearing
ballTolerance = 0.4;  // play between ball and surface
wallThickness = 2.5;
gapWidth = ballDiameter / 3;
baseThickness = 4; // WAS 3

//baseHeight = ballDiameter + wallThickness * 2;
pedistalWidth = ballDiameter + wallThickness * 2;

baseWidth = 30; // distance between mounting holes

M3holeDia = 3.5;
M3nutDia = 6.5;

echo(deckHeight);
baseHeight = deckHeight - ballDiameter / 2;
echo(baseHeight);

module mainShape(){

    // mounting cross-piece
	translate([-baseWidth/2, -wallThickness - M3holeDia / 2, 0])
        cube([baseWidth, wallThickness * 2 + M3holeDia, baseThickness]);

	// bolt ends
	translate([baseWidth / 2, 0, 0])
        cylinder(baseThickness, M3holeDia / 2 + wallThickness, M3holeDia / 2 + wallThickness, $fn=40);
	translate([-baseWidth / 2, 0, 0])
        cylinder(baseThickness, M3holeDia / 2 + wallThickness, M3holeDia / 2 + wallThickness, $fn=40);

	// main cylindrical body
	translate([0, 0, 0])
        cylinder(baseHeight - 3, pedistalWidth / 2, pedistalWidth / 2, $fn=50);

	difference(){
        // tapper shere at top
		translate([0, 0, baseHeight - 2])
            sphere(pedistalWidth / 2, $fn=50);

        // shave the top flat
		translate([0, 0, baseHeight + ballDiameter / 2 - ballDiameter / 5])
            cylinder(25, 25, 25, $fn=50);

		// shave the bottom	flat
		translate([0, 0, -12])
            cylinder(12, 25, 25, $fn=50);

	};
}

module cutout(){

    // ball hole
	translate([0, 0, baseHeight + ballTolerance])
        sphere(ballDiameter / 2 + ballTolerance, $fn=50);

    // slot to remove ball
    slotOffset = ballDiameter / 2.5;  // distance below baseHeight to cut slot
    if (baseHeight - slotOffset > baseThickness){
        translate([-gapWidth / 2, -baseWidth / 2,
                   baseHeight - slotOffset])
            cube([gapWidth, baseWidth, ballDiameter]);

        }
    else{ // don't cut into base
        translate([-gapWidth / 2, -baseWidth / 2,
                   baseThickness])
            cube([gapWidth, baseWidth, ballDiameter]);
    }

    //trim sides
    translate([-25, ballDiameter / 2 + 0.5, 0])
            cube([50, ballDiameter, 50]);

    translate([-25, -ballDiameter - 0.5, 0])
            cube([50, ballDiameter / 2, 50]);

    if ((baseHeight - ballDiameter / 2) > baseThickness){
         // ball void to save material
        translate([0, 0, baseHeight - ballDiameter - 1])
            sphere(ballDiameter / 2, $fn=50);
    }

}

module mountingHoles(){
    // left m3 hole
	translate([baseWidth / 2, 0, 0])
	cylinder(baseThickness + 2, M3holeDia / 2, M3holeDia / 2, $fn=30);

    // countersink
	translate([baseWidth / 2, 0, 2])
    rotate([0, 0, 30])
	cylinder(baseThickness + 2, M3holeDia, M3holeDia, $fn=6);

    // right m3 hold
	translate([-baseWidth / 2, 0, 0])
	cylinder(baseThickness + 2, M3holeDia / 2, M3holeDia/2, $fn=30);

    // countersink
	translate([-baseWidth / 2, 0, 2])
    rotate([0, 0, 30])
	cylinder(baseThickness + 2, M3holeDia, M3holeDia, $fn=6);
}

rotate([0, 0, 90])
difference(){
	mainShape();
	cutout();
	mountingHoles();

}

// show ball?
//translate([0, 0, baseHeight])
//    sphere(ballDiameter/2, $fn=50);
```