[User]
I'd like to create a customizable box with lattice walls to save on filament. I've seen some examples, but I need one that fits my specific requirements, and I'm hoping you can generate the OpenSCAD files for me.

Here's what I'm looking for:

**Basic Parameters:**

*   I need to be able to choose whether I'm creating just the box, just the lid, or both. I'd like a single file that handles all three options, if possible.
*   I need to specify the inside dimensions of the box (length, width, and height) separately.
*   The lid should have an outside height that I can control.
*   I also need a way to control the wall thickness for both the box and the lid.
*   I'd also like control over the lattice density, from completely open to solid (where 1 would be solid and 0 would be completely open).
*   Finally, I'd like to choose whether or not the bottom of the box and the top of the lid are printed solid or with the same lattice pattern as the rest of the walls.

**Advanced Parameters:**

*   I want to have a solid frame around all edges of both the box and the lid, and the ability to control its width.
*   The spacing between the lattice lines should be a parameter.
*   I need to control the angle of the lattice, but I'm thinking that 45 degrees is likely best.
*   The lid should be designed to fit the box with a small gap that I can adjust, so I can easily get the lid on and off.
*   Finally, I'd like an option to preview the model on different common build plate sizes (like Makerbot Replicator 2 or Replicator). I know that there is a 'utils/build_plate.scad' file that can do this.

I think I covered everything. Please let me know if you have any questions or need clarification. I'm looking forward to seeing what you create!

[Assistant]
Customizable_Lattice_Box.scad:
```
// Customizable Lattice Box
// Author: Alexander Smith
// License: CC BY <https://creativecommons.org/licenses/by/4.0/>
//

// This OpenSCAD file is formatted for use by the Makerbot Customizer.

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

use <utils/build_plate.scad>;

/* [Basic] */
parts = "both";			// [box, lid, both]

box_inside_length = 50;	// [0:0.5:300]
box_inside_width = 50;		// [0:0.5:300]
box_inside_height = 50;	// [0:0.5:300]

// The width and length are determined by the box size and "Box To Lid Gap" (under Advanced settings).
lid_outside_height = 15;	// [0:0.5:300]

// Thickness of the walls of the box and lid.
wall_thickness = 2;			// [0.1:0.1:20]

// Density of the walls, from 0 (no lattice at all) to 1 (solid walls instead of a lattice).
density = 0.3;				// [0:0.1:1.0]

// Print the bottom of the box solid, instead of a lattice?
solid_bottom = 0;			// [0:no, 1:yes]

// Print the top of the lid solid, instead of a lattice?
solid_top = 0;				// [0:no, 1:yes]

/* [Advanced] */

// Width of the solid frame on all edges of the box and lid.
frame_width = 5;			// [0:0.1:20]

// Distance between lines of the lattice.
lattice_spacing = 5;		// [1:0.5:30]

// Rotation angle of the lattice. If you use anything other than 45 degrees, you should keep "lattice spacing" to 5mm or smaller to avoid needing support.
lattice_angle = 45;			// [0:5:90]

// The lid width and length will be expanded to leave this much gap on all sides between the inside of the lid and the outside of the box.
box_to_lid_gap = 1;			// [0:0.1:5]

build_plate_preview = -1; // [-1: None, 0:Makerbot Replicator 2, 1: Makerbot Replicator, 2:Makerbot Thingomatic]

// Creates a 2D lattice inside 'square(size, center)'.
// S: Distance between the lines of the lattice.
// density: How thick the lines are. 'density=1' is the same as square(size, center); 'density=0' creates nothing.
// alpha: The angle of the lattice lines will be alpha and alpha+90.
module lattice_square(size, S = 5, density = 0.1, alpha = 45, center = false)
{
    // scalar projection of vector a onto vector b
    function sproj(a, b) = a*b/sqrt(b*b /* dot product */);

    if (density >= 1) {
        square(size, center);

    } else if ((density <= 0)) {
        // nothing

    } else if (len(size) == undef) {
        // only a single number was given
        lattice_square([size, size], S, density, alpha, center);

    } else {
        W = (size[0] == undef ? 1 : size[0]);
        H = (size[1] == undef ? W : size[1]);

        // d = width of lines.
        // ('density' is the desired material density. 'd' is the calculated line width, accounting for the fact that the lines overlap.)
        density_fixed = max(0, min(1, density));
        d = S * (1 - sqrt(1 - density_fixed));
		//echo(str("Lattice line width = ", d, " for S=", S, ", density ", density_fixed));

        // center of the square
        C = [W, H]/2;
        // unit vectors along and normal to angle alpha, used below
        tmp1 = [cos(alpha), sin(alpha)];
        tmp2 = [-tmp1[1], tmp1[0]];

        // To keep things simple, we generate a lattice that is too big (guaranteed to be big enough in each direction), and clip it to the square.
        translate(center ? -C : [0,0])
        intersection() {
            // the clipping square:
            square([W, H]);

            // the lattice to clip:
            union() {
                for (k = [0:1]) {
                    // if k=0, v along alpha
                    // else, v perpendicular to alpha
                    v = (k == 0) ? tmp1 : tmp2;
                    n = (k == 0) ? tmp2 : tmp1;

                    // Figure out how much lattice to draw:
                    Vcorners = [[-W/2, H/2], [W/2, H/2], [W/2, -H/2], [-W/2, -H/2]];
                    // ... vertically ...
                    h_corner_projs = [for (i = [0:len(Vcorners)-1]) sproj(Vcorners[i], n)];
                    r_min = min(h_corner_projs);
                    r_max = max(h_corner_projs);
                    // ... and horizontally.
                    v_corner_projs = [for (i = [0:len(Vcorners)-1]) sproj(Vcorners[i], v)];
                    q_min = min(v_corner_projs);
                    q_max = max(v_corner_projs);

                    for (i = [floor(r_min/S) : ceil(r_max/S)]) {
                        P0 = q_min*v + i*S*n + C;
                        P1 = q_max*v + i*S*n + C;
                        // Draw a "line" from P0 to P1 with width d.
                        polygon([P0 - 0.5*d*n, P1 - 0.5*d*n, P1 + 0.5*d*n, P0 + 0.5*d*n]);
                    }
                }
            }
        }
    }
}

// Creates a 3D lattice inside 'cube(size, center)' by drawing a lattice in the face normal to 'face' and extruding it along the 'face' axis.
// For the meanings of the other parameters, see lattice_square.
module lattice_cube(size, face = "z", S = 5, density = 0.1, alpha = 45, center = false)
{
    X = (size[0] == undef ? 1 : size[0]);
    Y = (size[1] == undef ? W : size[1]);
    Z = (size[1] == undef ? 1 : size[2]);

    C = [X, Y, Z]/2;

    translate(center ? -C : [0,0,0])
    if (face == "x") {
        rotate([90, 0, 90]) linear_extrude(X) lattice_square([Y, Z], S, density, alpha);
    } else if (face == "y") {
        rotate([0, -90, -90]) linear_extrude(Y) lattice_square([Z, X], S, density, alpha);
    } else {
        linear_extrude(Z) lattice_square([X, Y], S, density, alpha);
    }
}

module _makeLatticeBox(O_dim, I_dim,  frame_width, S, density, alpha, solid_bottom)
{
    echo(str("outside = ", O_dim));
    echo(str("inside = ", I_dim));

    D = 0.5*(O_dim - I_dim);
    fw = frame_width;   // alias

    if (solid_bottom) {
        cube([O_dim[0], O_dim[1], D[2]]);
    } else {
        // lattice bottom
        lattice_cube([O_dim[0], O_dim[1], D[2]], face="z", S=S, density=density, alpha=alpha);

        // frame bottom
        if (fw > 0) {
            difference() {
                cube([O_dim[0], O_dim[1], D[2]]);
                translate([fw, fw, -1])
                    cube([O_dim[0] - 2*fw, O_dim[1] - 2*fw, D[2] + 2]);
            }
        }
    }

    for (i = [0:1]) {
        sgn = 2*(i - 0.5);  // map i to -1, 1

        translate(i*[0, I_dim[1] + D[1], 0]) {
            // lattice front, back
            lattice_cube([O_dim[0], D[1], O_dim[2]], face="y", S=S, density=density, alpha=sgn*alpha);

            // frame front, back
            if (fw > 0) {
                difference() {
                    cube([O_dim[0], D[1], O_dim[2]]);
                    translate([fw, -1, fw])
                        cube([O_dim[0] - 2*fw, D[1] + 2, O_dim[2] - 2*fw]);
                }
            }
        }

        translate(i*[I_dim[0] + D[0], 0, 0]) {
            // lattice sides
            lattice_cube([D[0], O_dim[1], O_dim[2]], face="x", S=S, density=density, alpha=sgn*alpha);

            // frame sides
            if (fw > 0) {
                difference() {
                    cube([D[0], O_dim[1], O_dim[2]]);
                    translate([-1, fw, fw])
                        cube([D[0] + 2, O_dim[1] - 2*fw, O_dim[2] - 2*fw]);
                }
            }
        }
    }
}

// Define exactly two of the parameters. The third will be inferred.
// The top will always be open.
module lattice_box(outside_dim, inside_dim, wall_thickness, frame_width = 5,  S = 5, density = 0.1, alpha = 45, solid_bottom = false)
{
    if (outside_dim == undef) {
        //echo("No outside");
        _makeLatticeBox(inside_dim + 2*wall_thickness*[1,1,1], inside_dim, frame_width, S, density, alpha, solid_bottom);
    } else if (inside_dim == undef) {
        //echo("No inside");
        _makeLatticeBox(outside_dim, outside_dim - 2*wall_thickness*[1,1,1], frame_width, S, density, alpha, solid_bottom);
    } else {
        //echo("No wall");
        _makeLatticeBox(outside_dim, inside_dim, frame_width, S, density, alpha, solid_bottom);
    }
}

build_plate(build_plate_preview);

B = [box_inside_length, box_inside_width, box_inside_height];
if ((parts == "both") || (parts == "box")) {
    echo("Box dimensions:");
	lattice_box(inside_dim = B,
				wall_thickness = wall_thickness, S = lattice_spacing, density = density,
				alpha = lattice_angle, frame_width = frame_width, solid_bottom = solid_bottom);
}
if ((parts == "both") || (parts == "lid")) {
    echo("Lid dimensions:");
	translate( (box_inside_length + 2*wall_thickness + 5) * (parts == "both" ? [1, 0, 0] : [0, 0, 0]) )
	lattice_box(inside_dim = [B[0], B[1], lid_outside_height - 2*wall_thickness] + (wall_thickness + box_to_lid_gap) * [2, 2, 0],
				wall_thickness = wall_thickness, S = lattice_spacing, density = density,
				alpha = lattice_angle, frame_width = frame_width, solid_bottom = solid_top);
}

```


[User]
Hey, I'm looking to get a custom keychain generator made in OpenSCAD. I've seen a few online, but I want something that lets me choose different styles, text, fonts, and spacing.

Ideally, I'd like these key chain styles: Classic, HashTag, Coin, Shield, Castle, Round Tag, and Blocky. I need to be able to set the plate height for the keychain.

I need a single text box where I can enter the text I want on the keychain. I need a dropdown menu to choose the font, and I'd like these fonts to be available: Letters.dxf, BlackRose.dxf, Orbitron.dxf, Knewave.dxf, and Braille.dxf.  I also need to be able to control the font size and height, plus adjust letter spacing. I need to be able to offset the text along the y axis so I can move the text up or down on the keychain.

The existing design (which I'm including as a reference) uses the Write.scad library. I also need a build plate helper object from the utils folder using the build_plate.scad file, so can you create that as well?

Could you please create this for me?

[Assistant]
keychainGen.scad:
```
// Batch Keychain Generator v1.0
// by TheNewHobbyist 2013 (http://thenewhobbyist.com)
// http://www.thingiverse.com/thing:101307
//
// I needed something to quickly generate custom models for
// a 3D printing demo I was doing. I was going to just
// make a pile of generic keychains but I thought it would
// be more fun if I could make customized models for each
// person.
//
// Change Log:
//
// v1.0
// Initial Release
//
// v1.1
// ADDED Round Tag and Blocky style keychains

// by matroskin (http://0x0h.com)
// https://www.thingiverse.com/thing:2555679
//
// I needed this too, but for more letters
// And i rewrite it for more comfortable work
//
// Change Log:
//v1.2
//rewrite for more letters in row
//
//v1.3
//add textSize and blockSize
//
//v1.4
//left only one textBox
//
//v1.5
//tune all variables
//
//v2.0 Huge Update
//Added font picker, font size picker, a lot of new styles of keychains
//You can choose one or two lines of text

/* [Make It Your Own] */

//Choose style of your keychain (HashTag,Coin,Shield,Castle coming soon)
Keychain_Style = "Tag"; //["Classic":Classic, "HashTag":HashTag, "Coin":Coin, "Shield":Shield, "Castle":Castle, "Tag":Round Tag, "Block":Blocky]
//Choose plate height
Plate_Height = 3; //[1:50]

/* [Text] */

//Write your text of first line
Text = "Hello";
//Choose font size
Text_Y_offset = -3; //[-50:50]
//Choose font
Font_Style = "write/orbitron.dxf"; //["write/Letters.dxf":Letters, "write/BlackRose.dxf":BlackRose, "write/orbitron.dxf":Orbitron, "write/knewave.dxf":Knewave, "write/braille.dxf":Braille]
//Choose font size
Font_Size = 12; //[1:50]
//Choose font height
Font_Height = 2; //[-1:50]
//Choose font height
Letter_Space = 0; //[-50.0:50.0]

/////////////////////////
// Beat it Customizer //
///////////////////////

/* [Hidden] */

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

use <write/Write.scad>
use <utils/build_plate.scad>

$fn=24;
if(Keychain_Style == "Classic") { classicKeychain(Text, Font_Size, Font_Style, Plate_Height,Text_Y_offset, Letter_Space); }
else if(Keychain_Style == "HashTag") { hashtagKeychain(len(Text)); }
else if(Keychain_Style == "Coin"){ coinKeychain(Text, Font_Size, Font_Style, Font_Height, Plate_Height); }
else if(Keychain_Style == "Shield") { shieldKeychain(len(Text)); }
else if(Keychain_Style == "Castle") { castleKeychain(len(Text)); }
else if(Keychain_Style == "Tag") { tagKeychain(Text, Font_Size, Font_Style, Font_Height, Plate_Height, Letter_Space); }
else if(Keychain_Style == "Block") { blockKeychain(Text, Font_Size, Font_Style, Font_Height, Plate_Height, Letter_Space);}

module classicKeychain(Text,FontSize,FontStyle,PlateHeight,TextYoffset,LetterSpace){
	if (Text != "")
	{
        rotate([-90,0,0])
        union() {
            difference(){
                translate([-FontSize/3+(FontSize/3 - FontSize/5)/2,0,0])
                rotate([90,0,0])
                cylinder(r=FontSize/3, h=PlateHeight, $fn=100, center=true);
                translate([-FontSize/3+(FontSize/3 - FontSize/5)/2,0,0])
                rotate([90,0,0])
                cylinder(r=FontSize/5, h=PlateHeight + 1, center=true);
                }
                translate([(FontSize*len(Text)+FontSize*len(Text)/50*LetterSpace)/2+FontSize/200,0,0])
                cube([FontSize*len(Text)+FontSize*len(Text)/50*LetterSpace+FontSize/100, PlateHeight,FontSize/6],center=true);
                translate([FontSize/2,0,0])
                for ( i = [0 : len(Text) - 1] )	{
                    translate([FontSize*i+FontSize*i/50*LetterSpace,0,
                    FontSize/3 + FontSize/6 + TextYoffset])
                    rotate([90,0,0])
                    write(Text[i], h=FontSize, t=PlateHeight,
                    font=FontStyle, space=1, center=true);
                    }
               }
    }
}
module coinKeychain(Text, FontSize, FontStyle, FontHeight, plateHeight){
	if (Text != ""){
        rotate([-90,0,0])
        difference(){
            rotate([90,0,0])
            cylinder(r=FontSize/2*len(Text)+ 3,h=plateHeight, center=true);
            translate([0,0,FontSize/2*len(Text) - FontSize/2.5 * 2 +2])
            rotate([90,0,0])
            cylinder(r=FontSize/2.5, h=plateHeight + 1, center=true);
            for ( i = [0 : len(Text) - 1] )	{
                translate([-len(Text)*FontSize/3+(FontSize*i),-Plate_Height,0])
                rotate([90,0,0])
                write(Text[i], h=FontSize, t=Plate_Height+FontHeight,
                font=FontStyle,space=1, center=true);
            }
        }
    }
}
module tagKeychain(Text, FontSize, FontStyle, FontHeight, plateHeight,LetterSpace){

	if (Text != ""){
		translate([0,0,plateHeight/2]) {
			rotate([-90,0,0]){
				difference(){
					hull() {
						rotate([90,0,0])
                        cylinder(r=FontSize,
                        h=plateHeight, center=true);
						translate([(len(Text) * FontSize - FontSize/4)
                        +(len(Text) * FontSize - FontSize/4)/50*LetterSpace,0,0])
                        rotate([90,0,0])
                        cylinder(r=FontSize,
                        h=plateHeight, center=true);
					}
					rotate([90,0,0])
                    cylinder(r=FontSize/2.5, h=plateHeight + 1, center=true);
					translate([FontSize,0,0])
					for ( i = [0 : len(Text) - 1] )	{
						translate([
                        (FontSize*i+FontSize*i/50*LetterSpace),
                        -Plate_Height,0])
                        rotate([90,0,0])
                        write(Text[i],
                        h=FontSize,
                        t=Plate_Height+FontHeight,
                        font=FontStyle,
                        space=1, center=true);
					}
				}
			}
		}
	}
}

module blockKeychain(Text, FontSize, FontStyle, FontHeight, PlateHeight, LetterSpace){
	if (Text != ""){
        rotate([-90,0,0])
        union() {
            difference(){
                translate([-FontSize/3+(FontSize/3 - FontSize/5)/2,0,0])
                rotate([90,0,0])
                cylinder(r=FontSize/2.5, h=Plate_Height, $fn=100, center=true);
                translate([-FontSize/3+(FontSize/3 - FontSize/5)/2,0,0])
                rotate([90,0,0])
                cylinder(r=FontSize/4.25, h=Plate_Height + 1, center=true);
            }
            translate([(FontSize*len(Text)+FontSize*len(Text)/50*LetterSpace)/2+FontSize/200,0,0])
            cube([FontSize*len(Text)+FontSize*len(Text)/50*LetterSpace+FontSize/100, PlateHeight,FontSize/2],center=true);
            translate([FontSize/2,0,0])
            for ( i = [0 : len(Text) - 1] )	{
                translate([FontSize*i+FontSize*i/50*LetterSpace,-FontHeight/2+Plate_Height/2,0])
                rotate([90,0,0])
                write(Text[i],h=FontSize,
                t=FontHeight,font=FontStyle,space=1,center=true);
            }
       }

	}
}

```


[User]
Hi, I'm looking to create a parametric design for a 3D printer spool holder, specifically the hub and adapter parts that interface with the spool. I'm envisioning something that builds upon several existing designs I've seen, but I need it to be fully parametric for different spool sizes and use 608ZZ bearings.

My design will consist of two main parts: a "hub adapter" that slides into the spool, and a "double bearing hub" that the adapter attaches to via 608ZZ bearings.

For the **hub adapter**, I need the following features and parameters:

*   **`spool_hole_diam`**:  Diameter of the hole in the spool that the adapter inserts into (adjustable range, maybe 53.0 to 80.0, default 57.5).
*   **`spool_wall_height`**: Height/thickness of the adapter's wall that presses against the inside of the spool (adjustable, 5.0 to 12.0, default 9).
*   An optional **`bearing_snap_in_helper`** feature, which is basically a small angled lip that allows the bearing to snap in easier (boolean on/off).
*   The design should include cutouts in the base for weight reduction and to potentially avoid printing on support material.
*   The adapter needs a torus-shaped ridge near the outer edge and a few reinforcement torus shapes.
*   The radius of the hub that holds the bearing is fixed.  I'm hoping you can build that into the design logic instead of an editable parameter. It should account for the use of a 608ZZ bearing.

For the **double bearing hub**, the parameters I need are:

*   **`spool_hole_diam`**: Diameter of the hole in the spool that the adapter inserts into (adjustable, 40.0 to 60.0, default 47.9). This should match, or be derived from the hub adapter parameter.
*   **`spool_wall_height`**: Height/thickness of the wall of the outer ring that interfaces with the hub adapter (adjustable, 5.0 to 12.0, default 8).
*   **`spool_wall_thickness`**: Thickness of the wall of the outer ring (default 3).
*    **`bevel_height`**:  Height of a bevel on the outer walls (default 4).
*    Similar to the adapter, there should be a **`bearing_snap_in_helper`** feature.
*   The design should include a bearing tube that holds two 608ZZ bearings. It should also include a built in bearing separator.
*   There should be torus-shaped reinforcements for the inner and outer walls of the bearing tube.
*   Again, the bearing dimensions should be derived to accommodate the use of 608ZZ bearings.

I'm using OpenSCAD, so please provide the code in that format. I don't need the full spool holder design - just the hub and adapter as parametric modules. I prefer that all the parameters be at the top of the .scad files. Could you generate two `.scad` files, one for each part?

Thanks!

[Assistant]
HubAdapter.scad:
```
//-- Parametric Spool Hub -with 608zz bearing-

//--    Spool adapter for inner hub

//-- remixed from thing #545954 by mateddy (James Lee)
//-- redesigned from thing #27139 by QuantumConcepts (Josh McCullough)
//-- and also based on a brilliant design by Sylvain Rochette (labidus),
//-- Thingiverse thing #596838.
//-- AndrewBCN - Barcelona, Spain - December 2014
//-- GPLV3

// Parameters

// Spool Hole Diameter
spool_hole_diam = 57.5; // [53.0:80.0]
// Internal Spool Thickness
spool_wall_height=9; // [5.0:12.0]

/* [Hidden] */
// Add a bevel to let the bearing snap in easier
bearing_snap_in_helper=1;

//-- the rest are not adjustable
bearing_snap_in_helper_height=2;
bearing_snap_in_helper_width=2;

r_spool = 45; // radius of spool hub

h = 10; // tube height
br = 48.2/2; // inner spool radius with tolerance for insertion (hub is 47.9 and 0.3mm is good, not snug)
t = 2; // tube thickness
e = 0.02;

$fn = 64;

// Modules

module cutouts() {
  // make four cutouts (yes, I know I should use a for loop)
  cube([5,100,50], center=true);
  cube([100,5,50], center=true);
  rotate([0,0,45]) cube([5,100,50], center=true);
  rotate([0,0,45]) cube([100,5,50], center=true);
}

module new_hub() {
  difference () {
    union() {
      // base
      difference() {
	cylinder(r=spool_hole_diam/2 + 4, h=2.5);
	// space for bearing
	translate([0,0,-e]) cylinder(r=br+e, h=h+e);
	cutouts();
      }
      // core which holds 608ZZ bearing
      hub_core();
      // wall
      difference() {
	cylinder(r=spool_hole_diam/2, h=5+spool_wall_height, $fn=100);
	translate([0,0,-e]) cylinder(r=spool_hole_diam/2-2, h=6+spool_wall_height+1);
	cutouts();
      }
      // torus-shaped ridge using rotate_extrude, yeah!!
      difference() {
	translate([0,0,4.8+spool_wall_height])
	  rotate_extrude(convexity = 10, $fn=64)
	  translate([spool_hole_diam/2-1.0, 0, 0])
	    circle(r = 1.4, $fn=64);
	translate([0,0,-e]) cylinder(r=spool_hole_diam/2-2, h=6+spool_wall_height+1);
	cutouts();
      }
      // torus-shaped reinforcement
/*    difference() {
	translate([0,0,3.4])
	  rotate_extrude(convexity = 10, $fn=64)
	  translate([br+4.3, 0, 0])
	    circle(r = 2, $fn=16);
	cutouts();
      }
      // another torus-shaped reinforcement
      difference() {
	translate([0,0,3.4])
	  rotate_extrude(convexity = 10, $fn=64)
	  translate([spool_hole_diam/2-2.1, 0, 0])
	    circle(r = 2, $fn=16);
	cutouts();
      }*/
    }

  if(bearing_snap_in_helper)translate([0,0,-e])
      cylinder(r1=br+e+bearing_snap_in_helper_width, r2=br+e, h=bearing_snap_in_helper_height);
  }
}

module hub_core() {
  intersection() {
    difference() {
      cylinder(r=r_spool, h=h);

      // space for bearing
      translate([0,0,-e])
        cylinder(r=br+e*2, h=h+e);
    }
  cylinder(r=br+t, h=h);
  }
}

// Print the part

new_hub();

```
doubleBearingHub.scad:
```
//-- Parametric Spool Hub with 608zz bearing

//--  Double bearing inner hub mod

//-- remixed from thing #545954 by mateddy (James Lee)
//-- redesigned from thing #27139 by QuantumConcepts (Josh McCullough)
//-- and also based on a brilliant design by Sylvain Rochette (labidus),
//-- Thingiverse thing #596838.
//-- AndrewBCN - Barcelona, Spain - December 2014
//-- GPLV3

// Parameters
/* [Hidden] */

// Spool Hole Diameter
spool_hole_diam = 47.9; // [40.0:60.0]
// Height of spool outer ring
spool_wall_height=8; // [5.0:12.0]

spool_wall_thickness = 3;
bevel_height = 4;

/* [Hidden] */
//-- the rest are not adjustable
bearing_snap_in_helper_height=1;
bearing_snap_in_helper_width=1;

r_spool = 45; // radius of spool hub

h = 18; // height of bearing tube

br = 11.1; // bearing radius with tolerance for insertion
bh = 7;  // bearing height (5 + helper + 1mm inside)

ir = 1.1;  // bearing separater inner-outer radius
t = 3; // bearing tube thickness
e = 0.02;

$fn = 64;

// Modules

module new_hub() {
  difference () {
    union() {
      // base
      difference() {
	cylinder(r=spool_hole_diam/2 + 3, h=1);
	// space for bearing
	translate([0,0,-e]) cylinder(r=br+e, h=h+e);
      }
      // base bevel
      difference() {
    translate([0,0, 1])
        cylinder(r1=spool_hole_diam/2+3, r2=spool_hole_diam/2, h=3);
    translate([0,0, 1+1])
        cylinder(r1=spool_hole_diam/2, r2=spool_hole_diam/2, h=3);
	// space for bearing
	translate([0,0,-e]) cylinder(r=br+e, h=h+e);
     }

      // core which holds 608ZZ bearing
      hub_core();
      // wall
      difference() {
	cylinder(r=spool_hole_diam/2, h=5+spool_wall_height, $fn=100);
	translate([0,0,-e]) cylinder(r=spool_hole_diam/2-spool_wall_thickness, h=6+spool_wall_height+1);
      }
    // end bevel
      difference() {
    translate([0,0, 5+spool_wall_height])
        cylinder(r1=spool_hole_diam/2, r2=spool_hole_diam/2-spool_wall_thickness, h=bevel_height);
    translate([0,0, 5+spool_wall_height])
        cylinder(r1=spool_hole_diam/2-spool_wall_thickness, r2=spool_hole_diam/2-spool_wall_thickness, h=bevel_height);
     }
      // torus-shaped reinforcement (small)
      difference() {
	translate([0,0,3.4])
	  rotate_extrude(convexity = 10, $fn=64)
	  translate([br+4.3, 0, 0])
	    circle(r = 2, $fn=16);
      }
      // another torus-shaped reinforcement (large)
      difference() {
	translate([0,0,3.4])
	  rotate_extrude(convexity = 10, $fn=64)
	  translate([spool_hole_diam/2-2.1, 0, 0])
	    circle(r = 2, $fn=16);
      }
    }
    // bearing snap in helper
    translate([0,0,-e])
      cylinder(r1=br+e+bearing_snap_in_helper_width, r2=br+e, h=bearing_snap_in_helper_height);
    translate([0,0, h-bearing_snap_in_helper_height])
        cylinder(r2=br+e+bearing_snap_in_helper_width, r1=br+e, h=bearing_snap_in_helper_height);
  }
}

module hub_core() {
  intersection() {
    difference() {
      cylinder(r=r_spool, h=h);

      // space for bearing
      translate([0,0,-e])
        cylinder(r=br+e*2, h=bh+e);
      translate([0,0,bh]) // wall
        cylinder(r=br-ir, h=h-bh*2+e*2);
      translate([0,0,h-bh-e]) // bearing 2
        cylinder(r=br+e, h=bh+e);
    }
  cylinder(r=br+t, h=h);
  }
}

// Print the part
new_hub();

```


[User]
I'm looking to create a parametric box generator in OpenSCAD, similar to the one described in the video you sent, but I would like to start with a clean design with no code and build up from the parts. The box should have rabbet joints for easy alignment and a sliding lid, and should be suitable for both 3D printing and CNC machining.

Here are the key parameters I need to control:

*   **`length`**: Outside length of the box in millimeters.
*   **`width`**: Outside width of the box in millimeters.
*   **`height`**: Outside height of the box in millimeters.
*   **`thickness`**: Thickness of the box walls in millimeters. This affects the interior dimensions.
*  **`tolerance`**: A numeric value to control the looseness of the lid fit. It should be a percentage of the material thickness, like in the example.
*   **`bit`**: A value for spacing between the pieces when laid out for CNC machining.

I'd like to create the design in separate modules for the different parts, like lid, bottom, side, and end pieces. Then I need a layout module that combines the different parts for different styles, such as all the parts arranged flat for CNC cutting or assembled. Specifically I would like to have the following layout styles:

*   **Layout 1:** All parts flat, arranged for a more cubicle box.
*   **Layout 2:** All parts flat, arranged for a longer, more rectangular box.
*   **Layout 3:** All parts flat, arranged for a tall box.
*   **Layout 4:** All parts flat, arranged for a pizza box style box.
*   **Assembled:** Box assembled for 3d printing.
*  **Exploded:**  Box exploded for better viewing of the parts.

For the sliding lid, the tolerance should be applied by making the slot wider, not by reducing the thickness of the lid flange.

Could you generate the OpenSCAD code for this box generator with these parameters and layout styles? I'm not interested in using any external libraries for this. Let me know if you need any other info.

[Assistant]
customizer_box.scad:
```
//Outside length of box in mm
length=50;
//Outside width of box in mm
width=40;
//Outside height of box in mm
height=30;
//Thickness of box walls in mm.  Take this into account for desired interior dimensions.
thickness=8;
//Tolerance affects the fit of the sliding lid.  Higher is looser.
tolerance=4;//[0:20]
//Bit is for CNC purposes.  This affects the spacing between pieces in the layout.
bit=6;
//Layout style.
layout=1;//[1:Layout1, 2:Layout2, 3:Layout3, 4:Layout4, 5:Assembled, 6:Exploded]

tlrnc=thickness*tolerance/100;

module lid() {
   translate([tlrnc,0,0])
      cube([width-thickness-2*tlrnc,length-thickness/2-tlrnc,thickness/2]);
   translate([thickness/2+tlrnc,thickness/2,0])
      cube([width-2*thickness-2*tlrnc,length-3/2*thickness-tlrnc,thickness]);
   difference() {
      translate([tlrnc,0,0])
         cube([width-thickness-2*tlrnc,thickness+tlrnc,thickness]);
      translate([0,thickness+tlrnc,thickness/2])
         cylinder($fn=50,thickness/2+2*tlrnc,thickness/2+tlrnc,thickness/2+tlrnc);
      translate([width-thickness,thickness+tlrnc,thickness/2-2*tlrnc])
         cylinder($fn=50,thickness/2+2*tlrnc,thickness/2+tlrnc,thickness/2+tlrnc);
   }
}

module bottom() {
   cube([width-thickness,length,thickness/2]);
   translate([thickness/2,thickness/2,0])
      cube([width-2*thickness,length-thickness,thickness]);
}

module side() {
   cube([height,length,thickness/2]);
   translate([thickness+tlrnc,thickness/2,0])
      cube([height-3/2*thickness-tlrnc,length-thickness,thickness]);
   translate([0,thickness+tlrnc,0])
      cube([thickness/2-tlrnc,length-3/2*thickness-tlrnc,thickness]);
   translate([0,thickness+tlrnc,thickness/2])
      rotate([0,90,0])
         cylinder($fn=50,thickness/2-tlrnc,thickness/2,thickness/2);
}

module end() {
   cube([width-thickness,height-3/2*thickness-tlrnc,thickness/2]);
   translate([thickness/2,thickness/2,0]) cube([width-2*thickness,height-2*thickness-tlrnc,thickness]);
}

module far_end() {
   cube([height-thickness/2,width-thickness,thickness/2]);
   translate([thickness+tlrnc,thickness/2,0])
      cube([height-2*thickness-tlrnc,width-2*thickness,thickness]);
   translate([0,thickness/2,0])
      cube([thickness/2-tlrnc,width-2*thickness,thickness]);
}

module box_layout_1 () {
// good for more cubicle boxes.
   lid();
   translate([0,length-thickness/2+bit,0]) bottom();
   translate([width-thickness+bit,0,0]) side();
   translate([width-thickness+bit,2*length+bit,0]) mirror([0,1,0]) side();
   translate([0,2*length-thickness/2+2*bit,0]) end();
   translate([width-thickness+bit,2*length+2*bit,0]) far_end();
}

module box_layout_2 () {
// good for longer boxes such as would hold a wine bottle on its side.
   lid();
   translate([length+bit,height+bit,0]) bottom();
   translate([length+width-thickness+bit,0,0])rotate([0,0,90])side();
   translate([length,length+height+bit,0]) rotate([0,0,-90])mirror([0,1,0]) side();
   translate([width/2+length/2-bit/2-thickness/2,length/2-width/2+height/2+thickness,0]) rotate([0,0,90])end();
   translate([width/2+length/2+bit/2-thickness/2,length/2-width/2+height/2+thickness,0])                 far_end();
}

module box_layout_3 () {
// good for tall boxes.
   lid();
   translate([0,length-thickness/2+bit,0]) bottom();
   translate([width-thickness+bit,0,0]) side();
   translate([width-thickness+bit,2*length+bit,0]) mirror([0,1,0]) side();
   translate([width-thickness+bit,2*length+2*bit,0])far_end();
   translate([width-thickness/2+bit,2*width-2*thickness+2*length+3*bit,1])rotate([0,0,-90])end();
}

module box_layout_4 () {
// good for pizza box shaped boxes.
   lid();
   translate([0,length-thickness/2+bit,0]) bottom();
   translate([0,height+2*length-thickness/2+2*bit,0]) rotate([0,0,-90])side();
   translate([0,height+2*length-thickness/2+3*bit,0]) rotate([0,0,90])mirror([0,1,0]) side();
   translate([0,3*height-3/2*thickness/2+2*length+4*bit,0])rotate([0,0,-90])far_end();
   translate([0,3*height-3/2*thickness/2+2*length+5*bit,0])end();
}

module assembled_box() {
   translate([0,0,height-thickness]) lid();
   translate([0,0,0]) bottom();
   translate([-thickness/2,0,height]) rotate([0,90,0]) side();
   translate([width-thickness/2,0,height]) rotate([180,90,0])mirror([0,1,0]) side();
   translate([0,length,height]) rotate([90,0,0])rotate([0,0,-90])far_end();
   translate([width-thickness,0,thickness/2]) rotate([90,0,180])end();
}

module exploded_box() {
   translate([0,0,height]) lid();
   translate([0,0,-thickness]) bottom();
   translate([-3/2*thickness,0,height]) rotate([0,90,0]) side();
   translate([width+thickness/2,0,height]) rotate([180,90,0])mirror([0,1,0]) side();
   translate([0,length+thickness,height]) rotate([90,0,0])rotate([0,0,-90])far_end();
   translate([width-thickness,-thickness,thickness/2]) rotate([90,0,180])end();
}

if(layout==1) box_layout_1();
if(layout==2) box_layout_2();
if(layout==3) box_layout_3();
if(layout==4) box_layout_4();
if(layout==5) assembled_box();
if(layout==6) exploded_box();
```


[User]
Hey there, I'm looking for some help designing a parametric mount for a V4 microswitch. I've been playing around with OpenSCAD, but I'm getting bogged down in the details and need some help to get it right. I'd like to be able to customize it pretty extensively using the MakerBot Customizer, so I'd need it to be fully parametric.

Here are the main requirements. I need a mount for a V4 style microswitch - the one I have is roughly 9.5mm long (the activation direction), 20mm wide, and 6.4mm high (though a tiny bit less, like 6.35).  It has little mounting holes, wire connection tabs and some extensions for the button and back. I've included a model definition for that in the SCAD file I've been working with, if that's helpful.

The mount itself should attach to a V-slot extrusion, but ideally, it should also work with T-slot or any flat surface with a screw hole. The main body of the mount should extend out past the microswitch to provide space for wire connections and bolt holes, and some of it should go _behind_ the switch.

I need parameters for:
 *   **Switch Orientation:** It should be possible to flip the switch's orientation (as in, flip it 180 degrees in the xy plane), so the lever arm is on the "top" or "bottom".
 *   **Front Wall:** A thin wall under the switch lever arm is sometimes needed to stop a lever, and I need an option to include it or not, plus its thickness.
 *  **Smooth Holes:**  I want a parameter that adds a thin surface to cover bolt and mounting holes - which will need to be drilled out, but improves the appearance.
*   **Mount Length:** I need to control how much the mount extends beyond the switch for wiring and bolt holes.
*   **Tab Clearance:** There has to be space for wire connections to the tabs.
*  **Wire Exits:**  It's important to pick which sides or rear corner(s) wires exit from, so I need options to toggle wire exit from each side and from the rear.
*   **Rear Bolt Hole:** The option to create a bolt hole at the rear of the mount, with an additional option for a countersink if the screw is short.
 *   **Slot Base:** I need an option to create a slot that extends into the v-slot opening under the mount's base, including an offset for the rear bolt hole to be centered or not.
 *   **Vertical Extensions:** Options to extend the mount vertically down the side of the extrusion, and control how far down.
 *   **Horizontal Extensions:** Options to extend horizontally to an adjacent extrusion slot, plus a way to specify how far that extension goes and whether it creates a bolt hole and slot.
 * **Top Thickness:** Sometimes the bolt is too long, so I need a parameter to thicken the top of the mount, but only if the bolt length would otherwise cause an issue.
*  **Support Generation:** Options to generate support structures for countersunk bolt holes, instead of relying on the slicer.

For the actual dimensions, I'd like to keep things adjustable with parameters like `wallThickness`, `clearance`, `boltRadius` (and `boltHeadRadius`, `boltLength`, `boltSlotDepth`, `nutRadius`, `slotWidth`, `slotDepth`, and `slotOffset`).  I need to be able to pick how deep I want to sink the screws, and be able to do countersunk holes.

I have also been using a module for creating rounded corners and edges called "roundedCube," and would like to use that same module in the generated file. The specific implementation of it is in the included .scad file. I also had a 'shim' variable which I used to force the generated shapes to overlap slightly to be sure that all sides were covered.

I think that's it.  I know it's a lot, but I'd really appreciate the help getting this set up parametrically. I am not using any external libraries (like BOSL) for this design, so I do not need you to include any of those. I'd need this to be in one main .scad file.

[Assistant]
v4microwitch_mount.scad:
```
// Copyright (c) 2017 Robert T. Miller All Rights Reserved
// Licensed under the Creative Commons - Attribution (CC BY) license : http://creativecommons.org/licenses/by/4.0/

/* [General] */

// which way the switch arm goes
flip_switch=1;   // [0:false, 1:true]

// create thin front wall under switch arm
front_wall=1;	// [0:false,1:true]
front_wall_thickness=0.8;

// cover surface of holes with thin layer - needs to be drilled out but nicer product at the end.  Set to 0 or false to disable
smooth_hole=0.2;

// distance mount extends beyond switch; houses bolt and wire connections  (consider tab_clearance + 2*boltHeadRadius + 2*nutRadius for rear_bolt_hole with slot_base)
mount_len=30;

// space behind wire tabs for connections
tab_clearance=4;

/* [Wire exit] */
// wire exit side
wire_side1=0;  // [0:false,1:true]
wire_side2=0;  // [0:false,1:true]
// wire exit back
wire_rear1=1;	// [0:false,1:true]
wire_rear2=0;  // [0:false,1:true]

//------

/* [Behind switch] */
// rear mount: create bolt hole at rear (countersink if screw short -- see boltLength below)
rear_bolt_hole=1;	// [0:false,1:true]
// rear mount: extend down into v-slot under center mount base
slot_base=1;	// [0:false,1:true]
// rear mount: shift slot (mm) so housing off-center to match switch lever arm to whatever activates it
rear_bolt_offset=1;

// rear mount: make side extend vertically down side of extrusion beneath it
extend_side1_vert=0;  // [0:false,1:true]
extend_side2_vert=0;  // [0:false,1:true]
// rear mount: how far down each side to go
extra_side1_vert=3;
extra_side2_vert=3;

//------

/* [Beside switch] */
// side mount: make side extend across to adjacent extrusion slot
extend_side1_horz=0;  // [0:false,1:true]
extend_side2_horz=0;  // [0:false,1:true]

// side mount: create bolt hole to attach side
side_holes=1;	// [0:false,1:true]
// side mount: extend down into v-slot under horizontal side extensions
side_slot_base=1;	// [0:false,1:true]
// how far to extend - presumably the 1x extrusion width of 20mm so not exposing to customizer
extraSideHorz=20;

//------

/* [Hidden] */

// make top thicker to fill in for screw too long
thicken_top=0;  // [0:false,1:true]

// for countersunk holes, generate support instead of leaving to slicer
generateSupportRear=0;  // [0:false,1:true]
generateSupportS1=0;  // [0:false,1:true]
generateSupportS2=0;  // [0:false,1:true]

supportClearance=0.1;

// mount variables
wallThickness=1.6;
clearance=0.25;

boltRadius=2.5+clearance;  // m5 bolt

// optional shorter screws (countersunk)
boltHeadRadius=5;
boltLength=14;           // not counting head (base will be expanded -- use washer otherwise and adjust boltLength down)
boltSlotDepth=5;         // length of threads in v-slot groove

nutRadius=6.5;           // for slot_base option
slotWidth=6;
slotDepth=6;

slotOffset=10;           // distance from extrusion edge to center of slot

shim=0.001;
$fn=10;

//---------------------------- v4 microswitch model -------------
// V4 microswitch dimensions
// several images available online (google image search 'v4 micro switch dimensions') - many tiny variations, so these specific to my switch
sLength=9.5;   // direction of activation, smallest dimension (no bumps)
sWidth=20;
sHeight=6.4 - 0.05;   // reduce slightly so switch is clamped down

sFrontExtension=0.7;  // bump for pushbutton and lever arm hinge
sfeWidth= sWidth/2;   //10;
sBackExtension=0.4;   // bumps between wire tabs
sbeWidth=3.3;
sbeInset=4;

sHoleRadius=1.2;
sHoleOffsetLength=2.5;  // from back
sHoleOffsetWidth=5.4;

// wire connection tabs
sTabLength=4.6;
sTabSep1=8.4;    // behind hinge and pushbutton
sTabInset1=1.5;
sTabSep2=7;
sTabInset2=2;
sTabThickness=0.5;
sTabHeight=3.5;

// v4 microswitch model
module v4MicroSwitch(clearance=0) {
    difference()
    {
        union() {
            // front extension
            cube([sFrontExtension+clearance,sfeWidth+clearance,sHeight+2*clearance],center=false);
            translate([sFrontExtension,0,0])
                // main body
                cube([sLength+2*clearance,sWidth+2*clearance,sHeight+2*clearance],center=false);
                // switch arm
                translate([0,sWidth*0.05,sHeight*0.05])
                    rotate([0,0,20])
                        cube([0.5,sWidth*0.9,sHeight*0.9],center=false);
                // wire connection tabs
                translate([sLength+sFrontExtension+clearance-shim,sTabInset1+clearance,(sHeight-sTabHeight)/2+clearance])
                    cube([sTabLength+clearance+shim,sTabThickness+2*clearance,sTabHeight+2*clearance],center=false);
                translate([sLength+sFrontExtension+clearance-shim,sTabInset1+sTabThickness+sTabSep1,(sHeight-sTabHeight)/2+clearance])
                    cube([sTabLength+clearance+shim,sTabThickness+2*clearance,sTabHeight+2*clearance],center=false);
                translate([sLength+sFrontExtension+clearance-shim,sTabInset1+2*sTabThickness+sTabSep1+sTabSep2,(sHeight-sTabHeight)/2+clearance])
                    cube([sTabLength+clearance+shim,sTabThickness+2*clearance,sTabHeight+2*clearance],center=false);
                // back extensions
                translate([sFrontExtension+sLength+clearance-shim,sbeInset+clearance,0])
                    cube([sBackExtension+clearance+shim,sbeWidth+2*clearance,sHeight+2*clearance],center=false);
                translate([sFrontExtension+sLength+clearance-shim,sWidth+clearance-sbeInset-sbeWidth-2*clearance,0])
                    cube([sBackExtension+clearance+shim,sbeWidth+2*clearance,sHeight+2*clearance],center=false);
        }
        // holes
        translate([sFrontExtension+sLength+clearance-sHoleOffsetLength,clearance+sHoleOffsetWidth,-(sHeight+2*clearance)*0.05])
            cylinder(h=(sHeight+2*clearance)*1.1,r=sHoleRadius-clearance,center=false);
        translate([sFrontExtension+sLength+clearance-sHoleOffsetLength,sWidth+clearance-sHoleOffsetWidth,-(sHeight+2*clearance)*0.05])
            cylinder(h=(sHeight+2*clearance)*1.1,r=sHoleRadius-clearance,center=false);
    }
}

module v4MicroSwitchFlip(clearance=0) {
    translate([0,sWidth+2*clearance,sHeight+2*clearance])
        rotate([180,0,0])
            v4MicroSwitch(clearance);
}

//----------------- end v4 microswitch model ------------------

radius=wallThickness/2;
outerRadius=radius+1;

module roundedCubeNotCentered(size) {
     linear_extrude(height=size[2])
          hull() {
          translate([radius, radius*0.95, 0])
               circle(r=radius);

          translate([size[0] - radius, radius*0.95, 0])
               circle(r=radius);

          translate([size[0] - radius, size[1] - radius*0.95, 0])
               circle(r=radius);

          translate([radius, size[1] - radius*0.95, 0])
               circle(r=radius);
     }
}

module roundedCube(size,center) {
     if (center) {
          translate([-size[0]/2,-size[1]/2,-size[2]/2])
              roundedCubeNotCentered(size);
     } else {
          roundedCubeNotCentered(size);
     }
}

availableThread = boltLength-boltSlotDepth;
raise = availableThread - (sHeight+(clearance+wallThickness));

topThickness = wallThickness + ( thicken_top && raise > 0 ? raise : 0 );

totalLength= mount_len + front_wall_thickness + 2*clearance + sBackExtension + sLength;
totalWidth= sWidth+2*(clearance+wallThickness);
totalHeight= sHeight+(clearance+topThickness);

//echo("topThickness= ", topThickness);

mountSpace= totalLength-(front_wall_thickness+sLength+2*clearance+sTabLength+tab_clearance);

difference() {
    union() {

        //cube([totalLength, totalWidth, totalHeight], center=false);
        roundedCube([totalLength, totalWidth, totalHeight],center=false);

        if(slot_base) {
            translate([front_wall_thickness+sLength+2*clearance+sTabLength+tab_clearance+shim,
                       (totalWidth - slotWidth)/2 + (flip_switch ? -rear_bolt_offset : rear_bolt_offset),
                       totalHeight])
                roundedCube([mountSpace,slotWidth,slotDepth],center=false);
        }
    }
    // microswitch body with flip
    translate([front_wall_thickness-sFrontExtension,wallThickness,topThickness])
        if (flip_switch) {
             v4MicroSwitchFlip(clearance);
            // front wall slightly thicker than sFrontExtension, remove face in front of sFrontExtension; leave [clearance] edge on both sides
            translate([-(front_wall_thickness-sFrontExtension)-shim,(sWidth+2*clearance)-(sfeWidth+clearance)+(front_wall ? clearance : 0)+shim,0])
                cube([front_wall_thickness-sFrontExtension+clearance,sfeWidth-(front_wall ? clearance : -clearance),sHeight+2*clearance+shim],center=false);

            // clear front wall as desired
            if (! front_wall) {
                translate([-(front_wall_thickness-sFrontExtension)-shim,0,0])
                    cube([front_wall_thickness+clearance,sWidth-sfeWidth+2*clearance,sHeight+2*clearance+shim],center=false);
            }
        } else {
            v4MicroSwitch(clearance);
            // front wall slightly thicker than sFrontExtension, remove face in front of sFrontExtension; leave [clearance] edge on both sides
            translate([-(front_wall_thickness-sFrontExtension)-shim,(front_wall ? clearance : 0)+shim,0])
                cube([front_wall_thickness-sFrontExtension+clearance,sfeWidth-(front_wall ? clearance : 0),sHeight+2*clearance+shim],center=false);
            // clear front wall as desired
            if (! front_wall) {
                translate([-(front_wall_thickness-sFrontExtension)-shim,sWidth-sfeWidth,0])
                    cube([front_wall_thickness+clearance,sWidth-sfeWidth+2*clearance,sHeight+2*clearance+shim],center=false);
            }

        }

    // shorten cylinders to wallThickness tall
    translate([front_wall_thickness+clearance,wallThickness+clearance,wallThickness+clearance+topThickness])
        cube([sLength,sWidth,sHeight],center=false);

    // make space for wire tabs
    // clear regions between sBackExtensions
    //  slice in width dimension to clear unwanted face
    translate([front_wall_thickness+sLength+clearance-shim,wallThickness,topThickness])
        cube([sBackExtension+2*shim,sWidth+2*clearance,sHeight+2*clearance],center=false);
    //  side tube all the way back or just to side exit
    translate([front_wall_thickness+sLength+2*clearance-shim,wallThickness+clearance,topThickness])
        cube([sTabLength+( wire_rear1 ? mount_len : (wire_side1 ? 2*tab_clearance : tab_clearance)) ,sbeInset+clearance+shim,sHeight+2*clearance],center=false);
    //   center tube tab_clearance back
    translate([front_wall_thickness+sLength+2*clearance-shim,wallThickness+2*clearance+sbeInset+sbeWidth,topThickness])
        cube([sTabLength+tab_clearance,sWidth-2*sbeInset-2*sbeWidth-2*clearance,sHeight+2*clearance],center=false);
    // side tube all the way back or just to side exit
    translate([front_wall_thickness+sLength+2*clearance-shim,wallThickness+sWidth-sbeInset,topThickness])
        cube([sTabLength+(wire_rear2 ? mount_len : (wire_side2 ? 2*tab_clearance : tab_clearance) ) ,sbeInset+clearance+shim,sHeight+2*clearance],center=false);
    //  crosslink center tube to side tubes
    translate([front_wall_thickness+sLength+2*clearance+sTabLength,wallThickness+clearance+sbeInset,topThickness])
        cube([tab_clearance,sWidth-2*sbeInset+shim,sHeight+2*clearance],center=false);
    if (wire_side1) {
         translate([extraSideHorz,-shim,topThickness])
              cube([tab_clearance,sbeInset+wallThickness+2*clearance+shim,totalHeight-topThickness+shim],center=false);
         translate([extraSideHorz-radius,radius,topThickness])
              difference() {
              cylinder(h=totalHeight-topThickness+shim,r=outerRadius);
              cylinder(h=totalHeight-topThickness+shim,r=radius*1.02);
              translate([-(outerRadius),-radius,0])
                   cube([outerRadius,wallThickness,totalHeight-topThickness]);
              }
         translate([extraSideHorz+tab_clearance+radius,radius,topThickness])
              difference() {
              cylinder(h=totalHeight-topThickness+shim,r=outerRadius);
              cylinder(h=totalHeight-topThickness+shim,r=radius);
              translate([0,-radius,0])
                   cube([outerRadius,outerRadius,totalHeight-topThickness]);
              translate([-radius-shim,0,0])
                   cube([outerRadius+radius,outerRadius,totalHeight-topThickness]);
         }
    }
    if (wire_side2) {
         translate([extraSideHorz,wallThickness+sWidth-sbeInset,topThickness])
              cube([tab_clearance,sbeInset+wallThickness+2*clearance+shim,totalHeight-topThickness+shim],center=false);
         translate([extraSideHorz-radius,wallThickness+sWidth++2*clearance+radius,topThickness])
              difference() {
              cylinder(h=totalHeight-topThickness+shim,r=outerRadius);
              cylinder(h=totalHeight-topThickness+shim,r=radius*1.02);
              translate([-outerRadius,-radius,0])
                   cube([outerRadius,wallThickness,totalHeight-topThickness]);
         }
         translate([extraSideHorz+tab_clearance+radius,wallThickness+sWidth++2*clearance+radius,topThickness])
              difference() {
              cylinder(h=totalHeight-topThickness+shim,r=outerRadius);
              cylinder(h=totalHeight-topThickness+shim,r=radius);
              translate([-radius-shim,-outerRadius,0])
                   cube([2*outerRadius,outerRadius,totalHeight-topThickness]);
              translate([0,-radius,0])
                   cube([outerRadius+radius,outerRadius,totalHeight-topThickness]);
         }
    }
    // bolt hole
    if (rear_bolt_hole) {
         translate([0, (flip_switch ? -rear_bolt_offset : rear_bolt_offset), 0]) {
              sink = totalHeight-availableThread;
              tch = (smooth_hole ? smooth_hole : -clearance/2) + (sink > 0 ? sink : 0);

              translate([totalLength-mountSpace/2,totalWidth/2,tch])
                   cylinder(h=totalHeight+(smooth_hole ? -2*smooth_hole : clearance) + (slot_base ? slotDepth : 0) - (sink > 0 ? sink : 0),r=boltRadius,center=false);

              if (slot_base) {
                   translate([totalLength-mountSpace/2,totalWidth/2,totalHeight+shim])
                        cylinder(h=slotDepth,r=nutRadius,center=false);
              }

              if (availableThread < totalHeight) {
                   translate([totalLength-mountSpace/2,totalWidth/2,-shim])
                        cylinder(h=sink+shim,r1=boltHeadRadius+sink,r2=boltHeadRadius,center=false);
              }
         }
    }
}
/*
if (boltPlug) {
     if (rear_bolt_hole) {
         translate([totalLength-mountSpace/2,totalWidth/2,0])
              cylinder(h=0.2,r=boltRadius,center=false);
     }
}
*/

if (extend_side1_vert) {
     difference() {
          translate([0,0,totalHeight])
               roundedCube([extraSideHorz, wallThickness, extra_side1_vert],center=false);
          if (side_holes) {
               sink = (wallThickness-0.4)/2;
               translate([slotOffset,-shim,totalHeight+slotOffset])
                    rotate([270,0,0])
                    //cylinder(h=wallThickness+2*shim,r=boltRadius,center=false);
                    union() {   // design support
                         cylinder(h=sink + shim,r1=boltRadius+sink, r2=boltRadius,center=false);
                         translate([0,0,sink+0.4])
                              cylinder(h=sink + 2*shim,r1=boltRadius, r2=boltRadius+sink,center=false);
                    }
          }
     }
}

if (extend_side2_vert) {
     difference() {
          translate([0,totalWidth-wallThickness,totalHeight])
               roundedCube([extraSideHorz, wallThickness, extra_side2_vert],center=false);
          if (side_holes) {
               sink = (wallThickness-0.4)/2;
               translate([slotOffset,totalWidth-wallThickness-shim,totalHeight+slotOffset])
                    rotate([270,0,0])
                    //cylinder(h=wallThickness+2*shim,r=boltRadius,center=false);
                    union() {   // design support
                         cylinder(h=sink + shim,r1=boltRadius+sink, r2=boltRadius,center=false);
                         translate([0,0,sink+0.4])
                              cylinder(h=sink + 2*shim,r1=boltRadius, r2=boltRadius+sink,center=false);
                    }
          }
     }
}

mainSlot=(totalWidth-slotWidth)/2;
sideSlot= 2*slotOffset-mainSlot;
sideWidth= sideSlot+slotOffset;

if (extend_side1_horz) {
     difference() {
          union() {
               translate([0,-sideWidth,0])
                    roundedCube([extraSideHorz,sideWidth,totalHeight],center=false);
               translate([0,-outerRadius/2,0])
                    cube([outerRadius,outerRadius,totalHeight],center=false);
               translate([extraSideHorz-outerRadius,-outerRadius/2-shim,0 ])
                    cube([outerRadius,outerRadius,totalHeight],center=false);
               if (side_slot_base) {
                    translate([0, -sideSlot-slotWidth/2, totalHeight])
                         roundedCube([extraSideHorz,slotWidth,slotDepth],center=false);
               }
          }
          if (side_holes) {
               translate([extraSideHorz/2,-sideSlot,-clearance/2])
                    cylinder(h=totalHeight+clearance+slotDepth,r=boltRadius,center=false);
               if (slot_base) {
                    translate([extraSideHorz/2,-sideSlot,totalHeight+shim])
                         cylinder(h=slotDepth,r=nutRadius,center=false);
               }

               if (availableThread < totalHeight) {
                    sink = totalHeight-availableThread;
                    translate([extraSideHorz/2,-sideSlot,-shim])
                         cylinder(h=sink+shim,r1=boltHeadRadius+sink,r2=boltHeadRadius,center=false);
               }
          }
     }
}
if (extend_side2_horz) {
     difference() {
          union() {
               translate([0,totalWidth,0])
                    roundedCube([extraSideHorz,sideWidth,totalHeight],center=false);
               translate([0,totalWidth-outerRadius/2,0])
                    cube([outerRadius,outerRadius,totalHeight],center=false);
               translate([extraSideHorz-outerRadius,totalWidth-outerRadius/2-shim,0 ])
                    cube([outerRadius,outerRadius,totalHeight],center=false);
               if (side_slot_base) {
                    translate([0, totalWidth+sideSlot-slotWidth/2, totalHeight])
                         roundedCube([extraSideHorz,slotWidth,slotDepth],center=false);
               }
          }
         if (side_holes) {
              translate([extraSideHorz/2,totalWidth+sideSlot,-clearance/2])
                   cylinder(h=totalHeight+clearance+slotDepth,r=boltRadius,center=false);
              if (slot_base) {
                   translate([extraSideHorz/2,totalWidth+sideSlot,totalHeight+shim])
                        cylinder(h=slotDepth,r=nutRadius,center=false);
              }

              if (availableThread < totalHeight) {
                   sink = totalHeight-availableThread;
                   translate([extraSideHorz/2,totalWidth+sideSlot,-shim])
                        cylinder(h=sink+shim,r1=boltHeadRadius+sink,r2=boltHeadRadius,center=false);
              }
         }
     }
}

// support for countersunk bolt holes

sink = totalHeight-availableThread;
r1=boltHeadRadius/4;
r2=boltHeadRadius/20;

module boltHeadSupport(xOffset,yOffset) {
     translate([xOffset,yOffset,0])
          union() {
          cylinder(h=2*sink/3,r=boltHeadRadius-supportClearance,center=false);
          for(i = [0:7]) {
               rotate([0,0,45*i])
                    translate([boltRadius + (boltHeadRadius-boltRadius)/3,0,0])
                    cylinder(h=sink-supportClearance,r1=r1,r2=r2,center=false);
          }
     }

}

if (sink>0) {
     if (generateSupportRear) {
          boltHeadSupport(xOffset=totalLength-mountSpace/2, yOffset=totalWidth/2);
     }

     if (generateSupportS1) {
          boltHeadSupport(xOffset=extraSideHorz/2, yOffset=-sideSlot);
     }

     if (generateSupportS2) {
          boltHeadSupport(xOffset=extraSideHorz/2, yOffset=totalWidth+sideSlot);
     }
}

```


[User]
Hi, I'm looking to create a storage box with a lid in OpenSCAD, and I'd like it to use Minkowski sums for some of its features. I've attached a description and existing SCAD code that outlines what I'm looking for.

Essentially, I need a box with a base and a separate lid. The base has rounded corners created by using the Minkowski sum of a square and a circle. It also has an inner cutout to create the box's walls, also with rounded corners. The lid needs a piece that fits snugly into the box (with a small tolerance) and a top part that covers the opening of the box. Both parts of the lid should also have rounded corners from Minkowski sums.

I'd like to be able to adjust several parameters:

*   **`square_size`**: The size of the base square of the box.
*   **`circle_radius`**: The radius of the circle used for the Minkowski sum (to control the roundness of the corners).
*   **`wall_thickness`**: The thickness of the box walls.
*   **`extrude_len`**: The height of the box base.
*   **`tolerance`**: The tolerance between the lid and the box base.
*   **`lid_height`**: The height of the top part of the lid.
*    **`lid_depth`**: The depth of the lid's insert.

I'd like the design to be parametric so I can easily adjust these values in OpenSCAD. It looks like my current code uses only built-in modules so I think you only need to do that for your files.  I'd prefer to have the base and lid as separate parts/modules so I can easily move and orient them after the design is generated, and it'd be great if they were both contained within the same top-level file. I'm not particularly interested in using libraries at the moment, so just plain OpenSCAD is fine.

I’d appreciate it if you could generate the SCAD code for me. Thanks!

[Assistant]
SCAD_BOX.scad:
```
// Minkowski Sum (Dilation)Box
// Author: Akshay V. Dhamankar

// CUSTOMIZER VARIABLES

// Number of Fragments
$fn = 100;

// Box Square Size
square_size = 50;

// Minkowski Dilation Radius
circle_radius = 2;

// Wall Thickness
wall_thickness = 4;

// Box Height
extrude_len = 50;

// Tolerance
tolerance = 0.2;

// Lid Height
lid_height = 8;

// Lid depth
lid_depth = 5;

// CUSTOMIZER VARIABLES END
// Module 1: Base
module minkowski_base()
{

difference(){
// Main base
linear_extrude(extrude_len)
{
        minkowski()
        {
            square(square_size, center=true);
            circle(circle_radius);
        }
}

translate([0,0,(extrude_len-lid_depth)])
{
    linear_extrude(extrude_len)
    {
        minkowski()
        {
            square((square_size)-(wall_thickness), center=true);
            circle(circle_radius);
        }
    }
}

translate([0,0,wall_thickness])
{
    linear_extrude(extrude_len)
    {
        minkowski()
        {
            square((square_size - (wall_thickness*2)), center=true);
            circle(2);
        }
    }
}
}
}
minkowski_base();

// Module 2: Lid

// Lid Height
//lid_height = 4;

module minkowski_lid()
{
union()
{
    // Piece that Fits In
    translate([0,0,(extrude_len + 5)])

{
    linear_extrude(lid_depth - tolerance)
    {
        minkowski()
        {
            square(((square_size - wall_thickness)-tolerance), center=true);
            circle(circle_radius);
        }
    }
}
// Piece that Covers the Top
translate([0,0,extrude_len + 5 + (lid_depth-tolerance)])
{
//    linear_extrude(lid_height-(0.45*lid_height))
      linear_extrude(lid_height)
    {
        minkowski()
        {
            square(square_size, center=true);
            circle(circle_radius);
        }
    }
}
}
}
minkowski_lid();

```


[User]
Okay, I'd like to design a customizable sun shield for a tablet or phone, similar to the design in the provided SCAD file, but I need to be able to specify all the dimensions and positions via parameters. The design should consist of a main body with a device grip and a sun shield that extends outwards from the top and sides.

Here are the specific features I'm looking for:

1.  **Device Dimensions:**
    *   `lenght_of_your_device`: The length of the device.
    *   `thickness_of_your_device`: The thickness of the device.
    *   `width_of_your_device`: The width of the device.

2.  **Sun Shield Dimensions:**
    *   `thickness_of_shield`: The thickness of the sun shield.
    *  `lenght_of_shield`: The length of the sun shield extending out, but should not exceed `width_of_your_device`.

3.  **Grip Dimensions:**
    *   `thickness_of_grip`: The thickness of the grip walls.
    *   `height_of_front_part_of_the_grip`: Height of the front grip wall.
    *   `height_of_front_left_and_right_side_of_the_grip`: Height of the grip walls on the left and right sides.
    *  `height_of_back_part_of_the_grip`: Height of the back grip wall.

4.  **Top Holes (Optional):**
    *   `lenght_of_first_top_hole`: Length of the first hole. If 0, the hole should not be created
    *   `width_of_first_top_hole`: Width of the first hole.
    *   `position_of_first_top_hole`: Position of the center of the first hole, relative to the center of the device.
    *   `lenght_of_second_top_hole`: Length of the second hole. If 0, the hole should not be created
    *   `width_of_second_top_hole`: Width of the second hole.
    *   `position_of_second_top_hole`: Position of the center of the second hole, relative to the center of the device.

5.  **Side Holes (Optional):**
     *  **Right Side:**
        *   `lenght_of_first_right_hole`: Length of the first right hole. If 0, the hole should not be created
        *   `width_of_first_right_hole`: Width of the first right hole.
        *   `position_of_first_right_hole`: Position of the start of the first right hole relative to the edge of the device.
        *   `lenght_of_second_right_hole`: Length of the second right hole. If 0, the hole should not be created
        *   `width_of_second_right_hole`: Width of the second right hole.
        *   `position_of_second_right_hole`: Position of the start of the second right hole relative to the edge of the device.
    *   **Left Side:**
        *   `lenght_of_first_left_hole`: Length of the first left hole. If 0, the hole should not be created
        *   `width_of_first_left_hole`: Width of the first left hole.
        *   `position_of_left_right_hole`: Position of the start of the first left hole relative to the edge of the device.
        *   `lenght_of_second_left_hole`: Length of the second left hole. If 0, the hole should not be created
        *   `width_of_second_left_hole`: Width of the second left hole.
        *  `position_of_second_left_hole`: Position of the start of the second left hole relative to the edge of the device.

6.  **Hole Creation:** Use a Minkowski sum with a cylinder to create the holes with rounded corners.
7. **Mirroring:** Use mirroring to handle the right side rather than recreating the code for the left side.

I'd like to see a main file, `sun_shield_parametric.scad` along with any necessary modules (it would probably be a good idea to use several modules). Please ensure that all parameters are customizable via the OpenSCAD Customizer. The design should also account for the fact that the sun shield length should not exceed the device width. There's no need for any external libraries. I think this could be done without external libraries.

[Assistant]
sun_shield_v1.scad:
```
//$fn = 350; //rendering- number of detail
// preview[view:north east, tilt:top diagonal]
/* [Data_of_Your_device] */
//Variables for thingiverse customizer
//(tablet, smartphone, GPS navigation device)
lenght_of_your_device = 210; // [1:300]
thickness_of_your_device = 9;// [1:0.1:30]
width_of_your_device = 124; // [1:300]
/* [Data for sun shield] */
thickness_of_shield = 2; // [0.5:0.1:4]
//Values greater than width of device will not affect model
lenght_of_shield = 75;//[1:300]
//(exactly the walls of grip)
thickness_of_grip = 2; // [0.5:0.1:4]
height_of_front_part_of_the_grip = 5;// [1:40]
height_of_front_left_and_right_side_of_the_grip = 9;//[1:40]
height_of_back_part_of_the_grip = 12;//[1:50]
/* [First top hole] */
// If You don't want this hole - type 0
lenght_of_first_top_hole = 47; //[0:300]
width_of_first_top_hole = 25; // [0:300]
position_of_first_top_hole = 77; // [0:300]
/* [Second top hole] */
// If You don't want this hole - type 0
lenght_of_second_top_hole = 50; //[0:300]
width_of_second_top_hole = 9; // [0:300]
position_of_second_top_hole = 29; //[0:300]
/* [First right hole] */
// If You don't want this hole - type 0
lenght_of_first_right_hole = 25; // [0:300]
width_of_first_right_hole = 9; // [0:300]
position_of_first_right_hole = 24; // [0:300]
/* [Second right hole] */
// If You don't want this hole - type 0
lenght_of_second_right_hole = 40; //[0:300]
width_of_second_right_hole = 12; //[0:300]
position_of_second_right_hole = 43; //[0:300]
/* [First left hole] */
// If You don't want this hole - type 0
lenght_of_first_left_hole = 25; //[0:300]
width_of_first_left_hole = 9; //[0:300]
position_of_left_right_hole = 32; // [0:300]
/* [Second left hole] */
// If You don't want this hole - type 0
lenght_of_second_left_hole = 40; //[0:300]
width_of_second_left_hole = 12; //[0:300]
position_of_second_left_hole = 43; // [0:300]

// ignore variable values
l_dev = lenght_of_your_device;
t_dev = thickness_of_your_device;
w_dev = width_of_your_device;
t_sh = thickness_of_shield;

l_sh = lenght_of_shield>w_dev ? w_dev : lenght_of_shield; //blockade of length of shield
t_grip = thickness_of_grip;
hf_grip = height_of_front_part_of_the_grip;
hfs_grip = height_of_front_left_and_right_side_of_the_grip;
hb_grip = height_of_back_part_of_the_grip;

d_hole1= hb_grip>hf_grip ? hb_grip : hf_grip;
d_hole2= hfs_grip>hb_grip ? hfs_grip : hb_grip;//deep of the holes

lh1_top = lenght_of_first_top_hole;
wh1_top = width_of_first_top_hole;
lh2_top = lenght_of_second_top_hole;
wh2_top = width_of_second_top_hole;

//solution for minus position of holes
a = l_dev/2; //helper
pos_h1_top = position_of_first_top_hole - a;

pos_h2_top = position_of_second_top_hole - a;

lh1_right = lenght_of_first_right_hole;
wh1_right = width_of_first_right_hole;
//solution for position of holes
pos_h1_right = position_of_first_right_hole + lenght_of_first_right_hole;
lh2_right = lenght_of_second_right_hole;
wh2_right = width_of_second_right_hole;
pos_h2_right = position_of_second_right_hole + lenght_of_second_right_hole;

lh1_left = lenght_of_first_left_hole;
wh1_left = width_of_first_left_hole;
pos_h1_left = position_of_left_right_hole + lenght_of_first_left_hole;
lh2_left = lenght_of_second_left_hole;
wh2_left = width_of_second_left_hole;
pos_h2_left = position_of_second_left_hole + lenght_of_second_left_hole;

module top(){
    //bottom grip plate
    translate([-l_dev/2 - t_sh,0,0]){
        cube([l_dev + 2*t_sh, t_dev + t_grip, t_sh]);
    }
    //back grip plate
    translate([-l_dev/2 - t_sh,0,0]){
        cube([l_dev + 2*t_sh, t_grip, hb_grip]);
    }
    //front grip plate
    translate([-l_dev/2 - t_sh,t_dev + t_grip,0]){
        cube([l_dev +2*t_sh, t_grip, hf_grip+t_sh]);
    }
}

module top_plate(){
    translate([-l_dev/2 - t_sh,t_dev + 2 * t_grip,0]){
        cube([l_dev +2*t_sh, l_sh, t_sh]);
    }
}

module left_side_grip(){
    //side grip plate
    translate([-l_dev/2 - t_sh,0,0]){
        cube([t_sh, t_dev + t_grip, w_dev + t_sh]);
    }
    //back grip plate
    translate([-l_dev/2 - t_sh,0,0]){
        cube([hb_grip + t_sh, t_grip, w_dev + t_sh]);
    }
    //front grip plate
    translate([-l_dev/2 - t_sh,t_dev + t_grip,0]){
        cube([hfs_grip+t_sh, t_grip, w_dev + t_sh]);
    }
}

module left_side_plate(){
    translate([-l_dev/2 - t_sh,t_dev + 2 * t_grip,0]){
        cube([t_sh, l_sh, w_dev - l_sh + t_sh]);
    }
    //curved part of the side plate
  // color([0.1,1.0,0.2]){
        intersection(){
            translate([-l_dev/2- t_sh,t_dev + 2 * t_grip,w_dev - l_sh + t_sh]){
                cube([t_sh, l_sh, l_sh]);
            }
            translate([-l_dev/2- t_sh,t_dev + 2 * t_grip,w_dev - l_sh + t_sh]){
                rotate([0,90,0]){
                    cylinder(h = t_sh,r = l_sh);
                }
            }

        }

  //  }
}
//mirror of the side plate
module right_side_all(){
    mirror([1,0,0]){
        left_side_grip();
        left_side_plate();
    }

}

module top_hole(){

  //  color([0.1,0.8,0.2]){
        translate([pos_h1_top+3, 1, -1]){
            minkowski()
            {
              cube([lh1_top-6,wh1_top-4 + t_sh, d_hole1]); //6 because of cylinder r*2
              cylinder(r=3,h=d_hole1);
            }
        }

 //  }
}

module top_hole_2(){

  //  color([0.1,0.8,0.2]){
        translate([pos_h2_top+3,1,-1]){
            minkowski()
            {
              cube([lh2_top - 6, wh2_top - 4 + t_sh, d_hole1]);
              cylinder(r=3,h=d_hole1);
            }
        }

  // }
}

module right_hole(){
  // color([0.1,0.8,0.2]){
        translate([l_dev/2-d_hole2-0.01,0,pos_h1_right-3]){  //0.01 value is used beause of rendering problem (shadows)
            rotate([0,90,0]){
                minkowski()
                {
                  cube([lh1_right - 6 - t_sh, wh1_right-3 + t_sh,d_hole2]);
                  cylinder(r=3,h=d_hole2);
                }
            }
        }

  // }

}

module right_hole_2(){
  //  color([0.1,0.8,0.2]){
        translate([l_dev/2-d_hole2-0.01,0,pos_h2_right-3]){//0.01 value is used beause of rendering problem (shadows)
            rotate([0,90,0]){
                minkowski()
                {
                  cube([lh2_right - 6 - t_sh,wh2_right-3 + t_sh, d_hole2]);
                  cylinder(r=3,h=d_hole2);
                }
            }
       }

 //  }

}

module left_hole(){

 //   color([0.1,0.8,0.2]){
        translate([-l_dev/2 - 0.01- t_sh, 0, pos_h1_left-3]){ //0.01 value is used beause of rendering problem (shadows)
            rotate([0,90,0]){
                minkowski()
                {
                  cube([lh1_left - 6 - t_sh,wh1_left-3 + t_sh+0.01, d_hole2]);//0.01 value is used beause of rendering problem (shadows)
                  cylinder(r=3,h=d_hole2);
                }
            }
        }

 //  }
}

module left_hole_2(){

 //   color([0.1,0.8,0.2]){
        translate([-l_dev/2 - 0.01- t_sh, 0, pos_h2_left-3]){ //0.01 value is used beause of rendering problem (shadows)
            rotate([0,90,0]){
                minkowski()
                {
                  cube([lh2_left - 6 - t_sh,wh2_left-3 + t_sh+0.01,d_hole2]); //0.01 value is used beause of rendering problem (shadows)
                  cylinder(r=3,h=d_hole2);
                }
            }
        }

  // }
}

module difference_top(){
    difference(){
        difference(){

          top();
          top_hole();

        }
        top_hole_2();
    }
    difference(){
        difference(){

          top_plate();
          top_hole();

        }
        top_hole_2();
    }

}

module difference_left(){
    difference(){
      difference(){

          left_side_grip();
          left_hole();

      }
      left_hole_2();
    }
    difference(){
      difference(){

          left_side_plate();
          left_hole();

      }
      left_hole_2();
    }

}

module difference_right(){
    difference(){
       difference(){

      right_side_all();
      right_hole();

       }
     right_hole_2();
    }

}

difference_top();
difference_right();
difference_left();
```


[User]
I need a parametric OpenSCAD design for a filament mixer that works with a single-nozzle dual-extrusion setup. It should be a Y-shaped guide where two filament inputs merge into a single output. The key features are:

*   **Pushfit Connectors:** Each of the two inputs and the single output should use pushfit connectors with threads. Please use the `threads.scad` library for this. The thread size needs to be adjustable via a parameter, and the length of the threaded portion also. I want to be able to specify the thread diameter, the length of the threaded portion, and the space between the pushfit threads (for the sake of design, we can assume these to be the same values for all three threads, but they must each be parametric). The threading should be internal.
*   **Liner Tubes:** There needs to be a liner inside the mixing area, with a defined inner diameter, and outer diameter, and it needs to have an adjustable tolerance on its outer diameter. This liner should form a continuous path from each of the inputs to the single output, effectively guiding the filament as they merge. I need to be able to set the outer diameter and inner diameter separately.
*   **Mixing Angle:** The angle at which the two input channels merge into the single output should be adjustable via a parameter. This should be symmetrical, so the two input channels are at the same angle relative to the output channel.
*   **Output Length:** The length of the output section after the merging point before the output pushfit should also be parametric.
*   **Outer Shell:** The whole structure needs to be enclosed by a smooth, outer shell. The radius of the outer shell should be a parameter too.
*   **Filament Diameter:** I need to be able to set the filament diameter (though, it's not super important for the overall geometry.)
*   **Parametricity:** It needs to be fully parametric so I can easily adjust all these dimensions. I want to be able to tweak the thread dimensions and the other parameters via the customizer. I plan on 3D printing this in a single piece, and without support, so make sure there is no geometry requiring supports.

Basically, it's a Y-splitter where each arm has pushfit connectors for input and output filament, a liner tube to guide the filament, and an outer shell to hold everything together. The angles between the arms need to be adjustable, and all of the important dimensions should be parametric via the OpenSCAD customizer. Don't worry about the specific values for the parameters yet - I just need the design.

[Assistant]
mixer.scad:
```
layer_height=0.2; extrusion_width=0.4;
epsilon=0.01;
$fs=0.125;

draft=true;

use <threads.scad>;
module pushfit_thread(h=10) {
 thr = 3/8 + .5/25.4;
 slit = 25.4*thr/2 + 0.2;
 if(draft) cylinder(d=thr*25.4,h=h);
 else english_thread(diameter=thr,threads_per_inch=28,length=h/25.4,internal=true);
 translate([-2,-slit,0]) cube([4,2*slit,h]);
}

module the_mixer(
 pushfit_d = 10, pushfit_h = 10,
 liner_d = 4, liner_id = 2,
 filament_d = 1.75,
 join_angle = 30,

 interpushfit = 2*extrusion_width, // space between two pushfit's threads
 pushfit_s = 2, // shell around pushfit threads
 output_l = 4, // length of output after before pushfit
 outer_r = 3, // outer radius

 liner_d_tolerance = .2,
) {
 module liner(l,in) {
  inh=ld-liner_id;
  union() {
   translate([0,0,inh])
   cylinder(d=ld,h=l-inh,$fn=ld*PI*2);
   translate([0,0,-epsilon])
   cylinder(d1=ld+epsilon,d2=liner_id-epsilon,h=inh+2*epsilon);
  }
 }

 ld = liner_d+liner_d_tolerance;
 linero = ld/2/tan(join_angle/2); // liner offset
 pfrx = interpushfit/2/cos(join_angle/2); // radial margin
 pfR = pushfit_d/2+pfrx;      // radius of pushfit with margin
 pfo = pfR/tan(join_angle/2); // pushfit thread ofset

 h = pushfit_d+pushfit_s*2;
 difference() {
  hull() {
   for(s=[-1,1]) {
    rotate([0,0,s*join_angle/2])
    for(ss=[-1,1])
    translate([ss*pushfit_d/2,pfo+pushfit_h-outer_r-epsilon])
    cylinder(r=outer_r,h=h,center=true,$fn=outer_r*PI*4);
    translate([s*pushfit_d/2,-output_l-pushfit_h+outer_r+epsilon,0])
    cylinder(r=outer_r,h=h,center=true,$fn=outer_r*PI*4);
   }
  }
  for(s=[-1,1]) rotate([0,0,s*join_angle/2]) {
   translate([0,linero,0]) rotate([-90,0,0])
   liner(l=pfo-linero+1,in="bottom");
   //cylinder(d=ld,h=pfo-linero+1,$fn=ld*PI*4);
   translate([0,pfo,0]) rotate([-90,0,0])
   pushfit_thread(h=pushfit_h);
  }
  rotate([90,0,0]) {
   liner(l=output_l+1,in="top");
   //cylinder(d=ld,h=output_l+1,$fn=ld*PI*4);
   translate([0,0,output_l])
   pushfit_thread(h=pushfit_h);
  }
  hull() {
   for(s=[-1,1]) rotate([0,0,s*join_angle/2]) {
    rotate([-90,0,0])
    translate([0,0,linero])
    cylinder(d=ld,h=epsilon,$fn=ld*PI*4);
   }
   rotate([90,0,0])
   cylinder(d=ld,h=epsilon,$fn=ld*PI*4);
  }
 }
}

if(false) {
 difference() {
  the_mixer();
  cylinder(d=100,h=100);
 }
}else
 the_mixer();

```