[User]
Hey there! I'm looking to design a customizable base for OpenForge dungeon tiles, similar to the magnetic ones already out there, but with a few key differences and a focus on being printable without needing a roof or infill. I've been playing around with some code, but I really need help creating a robust, parametric design, and I'd like to have the files well-structured and easy to use.

Here's the basic idea:

**Core Structure**

*   The base should be made of walls, not a solid block. The walls should be designed to be printed with a very thin floor (around 0.5mm) but no roof or infill. This saves filament and printing time and it seems to print better.
*   The base should be modular - I can define an `x_size` and `y_size` which indicates how many OpenForge "units" wide and deep the base should be. An OpenForge unit should be a fixed size (ideally 25mm, or 25.4mm for inch based stuff).
*   There should be a `wall_thickness` parameter to adjust the wall thickness.
*   There should be a `base_height` parameter to control the overall height of the walls.

**Features**

*   I need holes for magnets, spaced out at the center of each "unit" along the wall. I need to set the `magnet_hole_diameter`. I also need an option for a very small `magnet_eject_hole_diameter` that will come out the floor to help remove magnets if needed.
*   I want a small hole for filament connectors along each unit where the base is to join other bases. I need to set the `filament_connector_hole_diameter` and they should be spaced `filament_connector_separation` apart along the joins. I also want to be able to control how far off the base floor they sit via a `filament_connector_lift` parameter. I'd like to be able to turn them off by setting the hole diameter to 0.
*   I'd like to have a decorative edge cut, where the edges look like small blocks instead of a straight line. This should be optional to turn off and be controllable with a `decorative_cut` parameter.
*   I need an inset ledge for the tile to rest on. The ledge should have adjustable `ledge_depth` and `ledge_height` parameters.
*   Finally, I want optional weld tabs that can be used to heat-weld the base to the tiles. These should have a `weld_tab_size` and `weld_tab_width`. They should be centered on the magnet locations, along the inside of the walls, and the number of tabs should scale with the size of the base.

**Key Parameters**

*   `unit_size` (fixed at 25 or 25.4, probably best as a hidden value, with a comment to explain it to the end user)
*   `x_size` (number of units in x dimension)
*   `y_size` (number of units in y dimension)
*   `wall_thickness`
*   `base_height`
*   `magnet_hole_diameter`
*   `magnet_eject_hole_diameter`
*   `filament_connector_hole_diameter`
*   `filament_connector_separation` (fixed, hidden with comment)
*   `filament_connector_lift` (fixed, hidden with comment)
*   `ledge_depth`
*   `ledge_height`
*  `weld_tab_size`
*   `weld_tab_width` (fixed, hidden with comment)
*   `decorative_cut`
*   `floor_thickness` (fixed, hidden with comment)

**Structure**

I would like the design to be broken down into a few different modules that I can use for other OpenForge components. Namely I think we'll need the following:

*   `wall(units)`: This module takes the number of `units` to extend the wall by.
*   `weld_tab()`: Creates the weld tab.
*   `base(x,y)`: Combines walls into a full base of size `x` and `y`

So, can you generate a set of OpenSCAD files to handle this? I don't think I need any special libraries.

[Assistant]
WeldableBase.scad:
```
/* Base Parameters */
x_size = 2; //[1:1:25]
y_size = 2; //[1:1:25]
wall_thickness = 7.5; //[5:0.1:25]
base_height = 6; //[0:100]
magnet_hole_diameter = 5.7;
filament_connector_hole_diameter = 2; //[0:None,2:1.75mm,3.25:3mm]
magnet_eject_hole_diameter = 0; //[0:.5:2]
ledge_depth = .5; // [0:.1:1]
ledge_height =.5; // [0:.1:1]
weld_tab_size = 1; //[0:None,1:Standard,1.5:Large]
decorative_cut = 1; //[0:None,1:Cut Edges]

/* [Hidden] */
unit_size = 25; // [25:OpenForge Standard,25.4:Exact Inch]
floor_thickness = .5;
filament_connector_separation = 4;
filament_connector_lift = 2;
weld_tab_width = 2;

module wall(units) {
    union() {
        difference() {
            cube([unit_size*units,wall_thickness,base_height]);
            translate([-ledge_depth,-ledge_depth,base_height-ledge_height]) cube([unit_size*units+2*ledge_depth,2*ledge_depth,2*ledge_height]);
            translate([-ledge_depth,-ledge_depth,base_height-ledge_height]) cube([2*ledge_depth,wall_thickness+2*ledge_depth,2*ledge_height]);
            translate([unit_size*units-ledge_depth,-ledge_depth,base_height-ledge_height]) cube([2*ledge_depth,wall_thickness+2*ledge_depth,2*ledge_height]);
            for( i = [1:units]) {
                translate([((i-.5)*unit_size),wall_thickness/2,floor_thickness])
                    cylinder(base_height,magnet_hole_diameter/2,magnet_hole_diameter/2,,$fn=60);
                translate([((i-.5)*unit_size),wall_thickness/2,-floor_thickness])
                    cylinder(base_height,magnet_eject_hole_diameter,magnet_eject_hole_diameter,$fn=60);
                translate([((i-.75)*unit_size)-(decorative_cut/2),-.5,-.5])
                    cube([decorative_cut,decorative_cut+.5,base_height+1]);
                translate([((i-.25)*unit_size)-(decorative_cut/2),-.5,-.5])
                    cube([decorative_cut,decorative_cut+.5,base_height+1]);
            }
            translate([-.5,.25*unit_size-(decorative_cut/2),-.5])
                cube([decorative_cut+.5,decorative_cut,base_height+1]);
            translate([-decorative_cut+(units*unit_size),0.25*unit_size,-.5])
                cube([decorative_cut+.5,decorative_cut-(decorative_cut/2),base_height+1]);
            if(units>1) {
                for(i=[1:units-1]) {
                    translate([(i*unit_size)-((filament_connector_separation+filament_connector_hole_diameter)/2),-1,filament_connector_lift+(filament_connector_hole_diameter/2)])
                        rotate([-90,0,0])
                            cylinder(wall_thickness+2,filament_connector_hole_diameter/2,filament_connector_hole_diameter/2,$fn=60);
                    translate([(i*unit_size)+((filament_connector_separation+filament_connector_hole_diameter)/2),-1,filament_connector_lift+(filament_connector_hole_diameter/2)])
                        rotate([-90,0,0])
                            cylinder(wall_thickness+2,filament_connector_hole_diameter/2,filament_connector_hole_diameter/2,$fn=60);
                }
            }
        }
        for(i=[0:units-1]) {
            translate([-weld_tab_size/2+unit_size/2-magnet_hole_diameter/2+unit_size*i,wall_thickness,base_height-weld_tab_size]) weld_tab();
            translate([-weld_tab_size/2+unit_size/2+magnet_hole_diameter/2+unit_size*i,wall_thickness,base_height-weld_tab_size]) weld_tab();
        }
    }
}

module weld_tab() {
    scale([weld_tab_width,weld_tab_size,weld_tab_size]) polyhedron(
        [[0,0,0], //0
        [1,0,0],  //1
        [1,0,1],  //2
        [0,0,1],  //3
        [0,1,1],  //4
        [1,1,1]],//5
        [[0,3,2,1],
        [3,4,5,2],
        [0,1,5,4],
        [0,4,3],
        [1,2,5]]);
}

module base(x,y) {
    union() {
        wall(x);
        translate([x*unit_size,(y*unit_size),0]) rotate([0,0,180]) wall(x);
        translate([(x*unit_size),0,0]) rotate([0,0,90]) {
            wall(y);
            translate([y*unit_size,(x*unit_size),0]) rotate([0,0,180]) wall(y);
        }
    }
}

base(x_size,y_size);

```


[User]
I'd like a parametric design for a twist puzzle, based on a tetrahedron. It'll be made of two identical pieces that interlock. I want to be able to control the size of the tetrahedron, the amount of twist in the cut that separates the two pieces, the tolerance gap between the pieces, how thick the walls are if I want a hollow center, the rounding of the internal and external edges, and also have a way to add an inset logo.

The basic shape is a tetrahedron. The cut that separates the two halves is a helical cut along the edges. I need to be able to control how many "turns" this helical cut makes.  The cut shouldn't be just a straight cut, but a band of cut with some tolerance gap so that the two parts can slide together.

Also, I'd like a parametric way to make a hollow center (or not, if I set a parameter to zero.) If the center is hollow, I want to be able to control the wall thickness and the rounding of the inside edges of the shell. Similarly, I want control over the rounding of the outside edges. Finally, I want to be able to add an inset logo, controlling the depth.

Could you design this as an OpenSCAD project? I'm thinking I need parameters for:

*   `micron_side`: The length of a tetrahedron edge in microns (e.g., 75000 for 75mm).
*   `tenth_turns`: A multiplier on the turns for the cut, initially should be set to 12 (this is multiplied by 0.1 to get the actual turn).
*   `micron_gap`: The assembly tolerance gap in microns.
*   `micron_wall_thickness`: The wall thickness for a hollow center, set to 0 for a solid center, in microns.
*   `micron_internal_rounding`: The radius for rounding internal edges, set to 0 for sharp edges, in microns.
*   `micron_external_rounding`: The radius for rounding external edges, set to 0 for sharp edges, in microns.
*   `micron_uk_logo`: The inset depth of the logo, 0 for no logo, in microns.

Please don't rely on any existing libraries or code, and remember to keep this parametric so I can tweak the fit and look, especially the tolerance gap. I also need each of the parameters available as a comment-delimited parameter in the OpenSCAD code.

[Assistant]
tttttt20160630.scad:
```
/*  tttttt20160630.scad

    Tunable Tolerance Tetrahedron Twist Timewasting Toy
    http://www.thingiverse.com/thing:1542564

    Inspired by http://www.thingiverse.com/thing:186372 and the
    unfortunate tolerancing of it (apparently zero clearance...
    and we don't like sanding PLA parts to fit), I wanted to
    create a parameterized-tolerance version.  Fortunately, an
    undergraduate student in my lab, Zachary Snyder, took it
    upon himself to do the math just before he graduated. I
    (Prof. Hank Dietz) then tweaked and repackaged it... also
    optionally sticking an (totally unofficial and for personal
    use only) University of Kentucky logo on it.  Actually, the
    logo makes the puzzle MUCH easier to solve because it
    provides a visual reference for how the two otherwise
    identical parts should intertwine.

    Perhaps the scariest thing is that this can just barely
    print assembled without supports!  In truth, a little
    support would be nice, but the sag is localized and small so
    that setting a larger gap can be good enough.  If that's not
    good enough for your printer, either enlarge the gap or use
    your slicer to separate the two intertwined pieces for
    separate printing.

    20160630 version fixes logo inset for solid center and
    exposes turns parameter with default of 1.2 rather than 1.0.
    The extra turn keeps the thickness of the parts more even,
    resulting in a print that doesn't break as easily.

    2016 by Zachary Snyder and Hank Dietz
    http://aggregate.org/hankd
*/

/*[Parameters]*/

// length of the tetrahedron edge (in microns, 75000 is 75.000mm)
micron_side = 75000;

// 10*turns for cut (originally 10, but 12 keeps thickness more even)
tenth_turns = 12;

// for assembly tolerance
micron_gap = 600;

// for making the center hollow, 0 for solid center
micron_wall_thickness = 0;

// radius for cavity edges, 0 is sharp
micron_internal_rounding = 4000;

// radius for outside edges, 0 is sharp
micron_external_rounding = 0;

// inset, 0 is no University of Kentucky logo
micron_uk_logo = 750;

/*[Hidden]*/

$fn = 0;
$fa = 5;
$fs = 0.1;

rounding_fn = 0;
rounding_fa = 5;
rounding_fs = 0.1;

side = micron_side / 1000;
gap = micron_gap / 1000;
wall_thickness = micron_wall_thickness / 1000;
internal_rounding = micron_internal_rounding / 1000;
external_rounding = micron_external_rounding / 1000;
uk_logo = micron_uk_logo / 1000;

size = side / sqrt(2);
inset = uk_logo; // ((uk_logo > wall_thickness) ? wall_thickness*2 : uk_logo);
theta = atan2(sqrt(2), 1);
cavity_difference = 2 * (wall_thickness + internal_rounding) / cos(theta);
size_difference = 2 * external_rounding / cos(theta);

function flipSin(x) = x < 90 ? sin(x) - 1 : 1 - sin(x);

function getFragmentsFromR(r) = $fn > 0 ? max(floor($fn), 3) : (ceil(max(min(360 / $fa, r * PI / $fs), 5)));

function zRotationMatrix(theta) = [
    [cos(theta), - sin(theta), 0],
    [sin(theta), cos(theta), 0],
    [0, 0, 1]
];

function width(radius, length, turns, gap) = gap / sin(atan2(length, 2 * PI * turns * radius)) / 2;

module tetrahedron()
{
    polyhedron(
points = [
    [1, 1, 1],
    [1, -1, -1],
    [-1, 1, -1],
    [-1, -1, 1]
],
faces = [
    [0, 1, 3],
    [0, 2, 1],
    [0, 3, 2],
    [1, 2, 3]
],
convexity = 2
    );
}

module helicut(radius=1, length=1, turns=1, center=false, gap=1)
{
    /* Basic Values */
    fragments = getFragmentsFromR (radius);
    angle_per_len = turns / length * 360;
    zh = length / fragments;
    z0 = (center ? - length / 2 : 0);
    rot_bottom = zRotationMatrix (z0 * angle_per_len);
    rot_top = zRotationMatrix ((z0 + length) * angle_per_len);

    /* Construct points */
    points =
        concat (
            [ /* Bottom Midpoints */
                for (i = [1:fragments])
                    let (r = radius * flipSin (((i - 0.5) / fragments) * 180))
                        rot_bottom * [r, 0, z0]
            ],
            [ /* Bottom Corners */
                for (i = [0:fragments])
                    let (
                        r = radius * flipSin ((i / fragments) * 180),
                        w = width (r, length, turns, gap)
                    )
                        for (p = [[r, w, z0], [r, - w, z0]])
                            rot_bottom * p
            ],
            [ /* Layers */
                for (i = [1:fragments])
                    let (
                        z = z0 + i * zh,
                        zmid = z - zh / 2,
                        angle = z * angle_per_len,
                        anglemid = zmid * angle_per_len,
                        rot = zRotationMatrix (angle),
                        rot_mid = zRotationMatrix (anglemid)
                    )
                        for (
                            p = concat (
                                [ /* Beginning Midpoint */
                                    rot_mid * [- radius, 0, zmid]
                                ],
                                [ /* Layer Midpoints */
                                    for (j = [1:fragments])
                                        let (
                                            r = radius * flipSin (((j - 0.5) / fragments) * 180),
                                            w = width (r, length, turns, gap)
                                        )
                                            for (q = [[r, w, zmid], [r, -w, zmid]])
                                                rot_mid * q
                                ],
                                [ /* End Midpoint */
                                    rot_mid * [radius, 0, zmid]
                                ],
                                [ /* Layer Corners */
                                    for (j = [0:fragments])
                                        let (
                                            r = radius * flipSin ((j / fragments) * 180),
                                            w = width (r, length, turns, gap)
                                        )
                                            for (q = [[r, w, z], [r, -w, z]])
                                                rot * q
                                ]
                            )
                        )
                            p
            ],
            [ /* Top Midpoints */
                for (i = [1:fragments])
                    let (r = radius * flipSin (((i - 0.5) / fragments) * 180))
                        rot_top * [r, 0, z0 + length]
            ]
        );

    /* Point Offsets */
    num_corners = 2 *(fragments + 1);
    bottom_mids = 0;
    bottom_corners = bottom_mids + fragments;
    layers = bottom_corners + num_corners;
    begin_mid = 0;
    layer_mids = begin_mid + 1;
    end_mid = layer_mids + 2 * fragments;
    layer_corners = end_mid + 1;
    layer_length = layer_corners + num_corners;
    top_mids = layers + fragments * layer_length;

    /* Faces */
    faces = concat(
        [ /* Bottom Faces */
            for (i = [0:fragments - 1])
                let (
                    coffset = bottom_corners + 2 * i,
                    c0 = coffset + 0,
                    c1 = coffset + 1,
                    c2 = coffset + 2,
                    c3 = coffset + 3,
                    m = bottom_mids + i
                )
                    for (p = [[m, c1, c3], [m, c3, c2], [m, c2, c0], [m, c0, c1]])
                        p
        ],
        [ /* Layers */
            for (i = [0:fragments - 1])
                let (
                    layer_offset = layers + layer_length * i,
                    bottom_corners = layer_offset - layer_length + layer_corners,
                    top_corners = layer_offset + layer_corners,
                    mids = layer_offset + layer_mids,
                    bc0 = bottom_corners + 0,
                    bc1 = bottom_corners + 1,
                    bc2 = top_corners + 0,
                    bc3 = top_corners + 1,
                    bm = layer_offset + begin_mid,
                    ec0 = bottom_corners + num_corners - 2,
                    ec1 = bottom_corners + num_corners - 1,
                    ec2 = top_corners + num_corners - 2,
                    ec3 = top_corners + num_corners - 1,
                    em = layer_offset + end_mid
                )
                    for (
                        p = concat(
                            [ /* Beginning Edge Faces */
                                [bm, bc3, bc1],
                                [bm, bc2, bc3],
                                [bm, bc0, bc2],
                                [bm, bc1, bc0]
                            ],
                            [ /* Planar Faces */
                                for (j = [0:fragments - 1])
                                    let (
                                        ioffset = 2 * j,
                                        pc0 = bottom_corners + ioffset + 0,
                                        pc1 = bottom_corners + ioffset + 2,
                                        pc2 = top_corners + ioffset + 0,
                                        pc3 = top_corners + ioffset + 2,
                                        pm = mids + ioffset + 0,
                                        nc0 = bottom_corners + ioffset + 1,
                                        nc1 = bottom_corners + ioffset + 3,
                                        nc2 = top_corners + ioffset + 1,
                                        nc3 = top_corners + ioffset + 3,
                                        nm = mids + ioffset + 1
                                    )
                                        for (
                                            q = [
                                                [pm, pc2, pc0],
                                                [pm, pc3, pc2],
                                                [pm, pc1, pc3],
                                                [pm, pc0, pc1],
                                                [nm, nc0, nc2],
                                                [nm, nc2, nc3],
                                                [nm, nc3, nc1],
                                                [nm, nc1, nc0]
                                            ]
                                        )
                                            q
                            ],
                            [ /* End Edge Faces */
                                [em, ec1, ec3],
                                [em, ec3, ec2],
                                [em, ec2, ec0],
                                [em, ec0, ec1]
                            ]
                        )
                    )
                        p
        ],
        [ /* Top Faces */
            for (i = [0:fragments - 1])
                let (
                    coffset = top_mids - layer_length + layer_corners + 2 * i,
                    c0 = coffset + 0,
                    c1 = coffset + 1,
                    c2 = coffset + 2,
                    c3 = coffset + 3,
                    m = top_mids + i
                )
                    for (p = [[m, c3, c1], [m, c2, c3], [m, c0, c2], [m, c1, c0]])
                        p
        ]
    );

    /* Polyhedron */
    polyhedron(points, faces, turns * 4);
}

module object()
{
    translate([0, 0, size/(2+sqrt(2))])
    rotate([0, 0, 45])
    rotate(a = theta, v = [1, -1, 0]) {
        /* Actual Part */
        difference() {
            /* Tetrahedron */
            if (external_rounding != 0) {
                minkowski() {
                    scale((size - size_difference) / 2) tetrahedron();
                    sphere(r = external_rounding, $fn = rounding_fn, $fa = rounding_fa, $fs = rounding_fs);

                }
            } else {
                scale(size / 2) tetrahedron();
            }

            /* Cavity */
            if (wall_thickness > 0) {
                if (internal_rounding != 0) {
                    minkowski() {
                        scale((size - cavity_difference) / 2) tetrahedron();
                        sphere(r = internal_rounding, $fn = rounding_fn, $fa = rounding_fa, $fs = rounding_fs);
                    }
                } else {
                    scale(size - cavity_difference / 2) tetrahedron();
                }
            }

            /* Helical Cut */
            rotate([0, 0, 90])
            helicut(radius = size * 2, length = size, turns = (tenth_turns/10), center = true, gap = gap);
        }
    }
}

module uk2016logo_1()
{
    /* Generated by trace2scad version 20150117
       http://aggregate.org/MAKE/TRACE2SCAD/
       Optimized model has 458/613 original points
    */
    minx=0; /* polygon minx=0 */
    miny=0; /* polygon miny=0 */
    maxx=20000; /* polygon maxx=20000 */
    maxy=15940; /* polygon maxy=15940 */
    dx=maxx-minx;
    dy=maxy-miny;
    maxd=((dx>dy)?dx:dy);
    color([0.48, 0.48, 0.48])
    scale([1/maxd, 1/maxd, 1])
    translate([-minx-dx/2, -miny-dy/2, 0])
    linear_extrude(height=1, convexity=458)
    union() {
        union() {
            polygon([[0,15423], [0,14905], [964,14905],
	    [968,14900], [971,14895], [1011,14895],
	    [1033,14880], [1056,14865], [1063,14865],
	    [1072,14855], [1082,14845], [1098,14845],
	    [1134,14809], [1170,14772], [1170,14761],
	    [1192,14733], [1220,14679], [1220,14652],
	    [1227,14642], [1235,14633], [1235,8252],
	    [1745,7743], [2255,7233], [2255,7222], [2419,7059],
	    [2583,6895], [5084,6895], [5087,6900], [5090,6904],
	    [5090,7922], [5082,7930], [4602,7932], [4123,7933],
	    [4105,7937], [4088,7941], [4052,7958], [4017,7975],
	    [4010,7982], [4004,7990], [3993,7990], [3956,8026],
	    [3920,8062], [3920,8073], [3910,8083], [3900,8092],
	    [3900,8109], [3895,8113], [3890,8116], [3890,8134],
	    [3883,8140], [3875,8146], [3875,8184], [3868,8190],
	    [3860,8196], [3860,14633], [3868,14642],
	    [3875,14652], [3875,14689], [3880,14692],
	    [3884,14695], [3900,14727], [3900,14738],
	    [3910,14748], [3920,14757], [3920,14772],
	    [3956,14809], [3992,14845], [4008,14845],
	    [4018,14855], [4027,14865], [4039,14865],
	    [4062,14880], [4084,14895], [4124,14895],
	    [4128,14900], [4131,14905], [5083,14905],
	    [5088,14910], [5093,14914], [5091,15427],
	    [5090,15940], [0,15940]], convexity=23);
            polygon([[9606,15424], [9608,14908], [10090,14906],
	    [10572,14905], [10582,14895], [10619,14895],
	    [10625,14888], [10631,14880], [10649,14880],
	    [10655,14873], [10661,14865], [10673,14865],
	    [10683,14855], [10692,14845], [10703,14845],
	    [10739,14809], [10775,14772], [10775,14762],
	    [10786,14752], [10796,14743], [10801,14733],
	    [10805,14723], [10809,14715], [10813,14708],
	    [10819,14696], [10825,14685], [10825,14651],
	    [10830,14648], [10835,14644], [10835,8191],
	    [10830,8188], [10825,8184], [10825,8145],
	    [10812,8121], [10799,8098], [10775,8072],
	    [10775,8062], [10739,8026], [10702,7990],
	    [10693,7990], [10680,7978], [10668,7966],
	    [10620,7940], [10582,7940], [10572,7930],
	    [9608,7928], [9608,6898], [10856,6896],
	    [12105,6895], [12278,7070], [12452,7245],
	    [12467,7245], [12969,7746], [13470,8247],
	    [13470,14644], [13475,14648], [13480,14651],
	    [13480,14685], [13486,14696], [13492,14708],
	    [13496,14715], [13500,14723], [13504,14733],
	    [13509,14743], [13519,14752], [13530,14762],
	    [13530,14772], [13566,14809], [13602,14845],
	    [13614,14845], [13620,14853], [13627,14861],
	    [13637,14866], [13648,14870], [13655,14874],
	    [13663,14879], [13678,14887], [13694,14895],
	    [13723,14895], [13733,14905], [14215,14906],
	    [14698,14908], [14700,15940], [9605,15940]],
	    convexity=23);
            polygon([[4808,9897], [4805,9893], [4805,8870],
	    [5763,8870], [5773,8863], [5783,8855], [5815,8855],
	    [5841,8843], [5868,8831], [5892,8805], [5903,8805],
	    [5939,8769], [5975,8732], [5975,8722], [5985,8713],
	    [5995,8703], [5995,8691], [6003,8685], [6010,8679],
	    [6010,8661], [6018,8655], [6025,8649], [6025,8611],
	    [6030,8608], [6035,8604], [6035,1296], [6030,1293],
	    [6025,1289], [6025,1258], [6015,1237], [6004,1215],
	    [6000,1212], [5995,1209], [5995,1192], [5985,1182],
	    [5975,1173], [5975,1162], [5939,1126], [5902,1090],
	    [5891,1090], [5885,1083], [5880,1076], [5843,1058],
	    [5807,1040], [5777,1040], [5767,1030], [5287,1029],
	    [4808,1028], [4806,514], [4805,0], [9900,0],
	    [9898,1028], [9415,1029], [8933,1030], [8923,1040],
	    [8884,1040], [8862,1055], [8839,1070], [8832,1070],
	    [8822,1080], [8813,1090], [8799,1090], [8765,1123],
	    [8730,1157], [8730,1173], [8718,1185], [8705,1197],
	    [8693,1222], [8680,1247], [8680,1284], [8673,1290],
	    [8665,1296], [8665,3799], [8672,3805], [8680,3811],
	    [8680,3848], [8693,3873], [8705,3898], [8718,3910],
	    [8730,3922], [8730,3938], [8765,3972], [8799,4005],
	    [8814,4005], [8820,4013], [8827,4021], [8837,4026],
	    [8848,4030], [8859,4037], [8871,4044], [8882,4055],
	    [8923,4055], [8933,4065], [10653,4063],
	    [12373,4062], [12390,4058], [12408,4054],
	    [12444,4037], [12480,4019], [12485,4012],
	    [12491,4005], [12503,4005], [13205,3302],
	    [13907,2600], [13918,2600], [14115,2403],
	    [14312,2205], [14323,2205], [14428,2100],
	    [14532,1995], [14548,1995], [14640,1903],
	    [14732,1810], [14748,1810], [14849,1709],
	    [14950,1607], [14950,1592], [14963,1580],
	    [14975,1568], [14975,1557], [14991,1525],
	    [14995,1522], [15000,1519], [15000,1483],
	    [15008,1473], [15015,1463], [15015,1303],
	    [15007,1293], [15000,1283], [15000,1246],
	    [14995,1243], [14991,1240], [14975,1208],
	    [14975,1197], [14963,1185], [14950,1173],
	    [14950,1157], [14916,1124], [14882,1090],
	    [14867,1090], [14858,1080], [14848,1070],
	    [14836,1070], [14813,1055], [14791,1040],
	    [14752,1040], [14742,1030], [14408,1028],
	    [14406,514], [14405,0], [20000,0], [20000,1030],
	    [18721,1030], [18718,1035], [18714,1040],
	    [18672,1040], [18661,1051], [18649,1058],
	    [18638,1065], [18627,1069], [18617,1074],
	    [18610,1082], [18604,1090], [18592,1090],
	    [16941,2741], [15290,4393], [15290,4403],
	    [15095,4598], [14900,4792], [14900,4803],
	    [14886,4817], [14871,4830], [14865,4851],
	    [14858,4873], [14854,4877], [14850,4882],
	    [14850,4913], [14842,4922], [14835,4932],
	    [14835,5103], [14843,5112], [14850,5122],
	    [14850,5153], [14858,5163], [14865,5184],
	    [14871,5205], [14886,5218], [14900,5232],
	    [14900,5243], [16681,7024], [18463,8805],
	    [18473,8805], [18497,8831], [18512,8837],
	    [18528,8844], [18541,8849], [18555,8855],
	    [18583,8855], [18592,8863], [18602,8870],
	    [20000,8870], [20000,9900], [14408,9898],
	    [14406,9395], [14405,8893], [14407,8881],
	    [14410,8870], [14633,8870], [14642,8862],
	    [14652,8855], [14684,8855], [14688,8850],
	    [14691,8845], [14720,8845], [14768,8819],
	    [14780,8807], [14793,8795], [14808,8795],
	    [14841,8761], [14875,8727], [14875,8712],
	    [14887,8700], [14900,8688], [14912,8663],
	    [14925,8638], [14925,8601], [14930,8597],
	    [14935,8594], [14935,8411], [14930,8408],
	    [14925,8404], [14925,8370], [14901,8318],
	    [14888,8305], [14875,8293], [14875,8282],
	    [14400,7808], [13925,7333], [13925,7317],
	    [13276,6669], [12627,6020], [12613,6020],
	    [12600,6008], [12588,5996], [12540,5970],
	    [12501,5970], [12498,5965], [12494,5960],
	    [8931,5960], [8928,5965], [8924,5970], [8887,5970],
	    [8859,5984], [8831,5999], [8817,6009], [8804,6020],
	    [8792,6020], [8761,6051], [8730,6083], [8730,6094],
	    [8718,6108], [8707,6123], [8693,6150], [8680,6177],
	    [8680,6214], [8673,6220], [8665,6226], [8665,8603],
	    [8673,8612], [8680,8622], [8680,8650], [8690,8668],
	    [8700,8685], [8700,8699], [8715,8714], [8730,8730],
	    [8730,8743], [8761,8774], [8793,8805], [8805,8805],
	    [8821,8820], [8836,8835], [8850,8835], [8868,8845],
	    [8885,8855], [8913,8855], [8923,8862], [8934,8870],
	    [9416,8871], [9898,8873], [9898,9898], [4812,9900]],
	    convexity=89);
        }
    }
}

module uk2016logo()
{
    /* all layers combined, scaled to within a 1mm cube */
    scale([1, 1, 1/1])
    difference() {
        union() {
            scale([1,1,2]) translate([0,0,-0.5]) uk2016logo_1();
        }
        translate([0,0,-2]) cube([2,2,4], center=true);
    }
}

module print_part()
{
    translate([0, -size/(1+sqrt(2)), 0])
    rotate([-acos(-1/3), 0, 0])
    translate([0, -size/(1+sqrt(2)), 0])
    difference() {
        object();
        if (inset > 0) {
            scale([size/1.75, size/1.75, inset*2+0.001])
            rotate([180, 0, 0])
            translate([0.07, 0.05, -0.5])
            uk2016logo();
        }
    }
}

print_part();

```


[User]
I need some help designing an OpenSCAD file for managing ethernet cables. The basic idea is to have a base plate that can be nailed or glued to a wooden stud, and then a series of stacking elements that hold the cables in place. Finally, I want to use some spare 3D printer filament to hold the stack together. I'm thinking acetone slurry might help bond the filament to the base plate if I print with ABS.

Here's a rough breakdown of what I'm envisioning:

**Base Plate:**

*   Should have a couple of rounded ends, like a cylinder cut in half lengthwise.
*   Needs holes for attaching it to the wall (maybe sized for the filament I'll be using) and also some pilot holes to guide the nails or screws.
*   The length will depend on the number of cables I want to manage in a row, plus a bit of extra space on the ends.

**Stacking Elements:**

*   Similar to the base plate in shape, but with rounded cutouts along one edge to hold the cables. These cutouts should be sized to the chosen cable diameter.
*   Also needs holes for the filament to pass through, aligned with the holes in the base plate.
*   The cutouts for the cables will need a lip to hold the cables in the stack.
*   The cutouts for the cables need to be on the opposite side of the mounting holes for the filament.

**Assembly:**

1. Attach the base plate to the wall.
2. Place cables in the stacking elements.
3. Thread filament through the holes in the base plate and stacking elements to hold everything together.

**Parameters:**

I want the design to be fully parametric so I can customize it. Here are the parameters I need to be able to adjust:

*   **Wall thickness:** Thickness of the walls of the base plate and stacking elements (e.g., 2mm).
*   **Cable diameter:**  Diameter of the ethernet cables (options for 5mm, 6mm, and 7mm).
*   **Filament diameter:** Diameter of the 3D printer filament I'll be using (options for 1.75mm and 3mm).
*   **Number of cables per row:** How many cables I want to manage in a single row (up to 20).
*   **Number of stacks:** How many rows of cables I want to stack vertically (up to 10).

I'm not sure if any external libraries are needed, but if so, please use whatever is most appropriate. The MCAD library might be useful, but I'm open to suggestions.

[Assistant]
cable_manager.scad:
```
// model variables
$fa=0.5*1; // default minimum facet angle is now 0.5 deg
$fs=0.5*1; // default minimum facet size is now 0.5 mm
tolx=0.25*1; // tolerance for mating parts.

// global variables for 19 inch rack
// thickness of walls
wall=2; // [0:5]
// diameter of cable, cat 6 is 6 mm
cable_diameter=6; // [5:cat 5 riser wire, 6:cat 6 plenum or stranded 5e, 7:cat 6A plenum]
// diameter of your printer filament
filament_diameter= 3; // [1.75,3]
filament_radius=filament_diameter/2+tolx;  // using diameter of your printer filament
unit_width=cable_diameter+wall;
// number of cables to manage in one row
ncable=7; // [1:20]
// number of cable stacks
nstack=2; // [1:10]

module base(ncable){
    difference(){
        hull(){
            cylinder(r=unit_width/2,h=wall);
            translate([0,(ncable+1)*unit_width,0])
                cylinder(r=unit_width/2,h=wall);}

        union(){
            translate([0,0,-tolx])
                cylinder(r=filament_radius,h=wall+2*tolx);
            translate([0,(ncable+1)*unit_width,-tolx])
                cylinder(r=filament_radius,h=wall+2*tolx);}
            translate([0,0.5*unit_width,-tolx])
                cylinder(r=1,h=wall+2*tolx);
            translate([0,(ncable+0.5)*(unit_width),-tolx])
                cylinder(r=1,h=wall+2*tolx);
        }
}

module stack(ncable,nstack){
    difference(){
        hull(){
            cylinder(r=unit_width/2,h=wall+cable_diameter);
            translate([0,(ncable+1)*(unit_width),0])
                cylinder(r=unit_width/2,h=wall+cable_diameter);}

        union(){
            translate([0,0,-tolx])
                cylinder(r=filament_radius,h=wall+cable_diameter+2*tolx);
            translate([0,(ncable+1)*unit_width,-tolx])
                cylinder(r=filament_radius,h=wall+cable_diameter+2*tolx);}
            for (ndx=[1:ncable]){
                translate([-unit_width/2-tolx,(ndx)*unit_width,cable_diameter/2+wall])
                rotate([0,90,0]){
                    cylinder(r=cable_diameter/2+tolx,h=unit_width+2*tolx);
                    translate([-cable_diameter,-0.75*(cable_diameter)/2-tolx,0])
                    cube([cable_diameter,0.75*cable_diameter+2*tolx,unit_width+2*tolx]);}
            }

        }
}

module cable_retainer(ncable,nstack){
    base(ncable);
    for(ndx=[1:nstack]){
        translate([ndx*(unit_width+1),0,0])
        stack(ncable,nstack);
    }
}

cable_retainer(ncable,nstack);
```


[User]
Alright, I'm looking to design some custom thumbsticks for game controllers, and I'd like to use OpenSCAD to make them parametric. I want to be able to adjust various dimensions to fit different controllers and preferences.

Here's the basic concept: the thumbstick will have a lower cylindrical part that attaches to the controller's stick, a main body, and then a thumb recess/dimple on top for grip.

Specifically, here's what I need to be able to control via parameters:

*   **Inner Cut:** There needs to be a cylindrical cut-out at the bottom for fitting onto the controller's existing stick. I need to control the **height** of this cut, its **diameter**, and the **resolution** (number of facets). I'd like to be able to set this as a true cylinder, or to specify a smaller bottom diameter than top for a more snug fit.
*   **Lower Collar:** This is a short cylinder just above the inner cut. I need to control its **height**, **outer diameter**, and **resolution**.
*   **Overall Height:**  The total height of the whole thumbstick from the very bottom of the inner cut, to the top.
*  **Upper Body:** This section forms the "main body" of the thumbstick. I'd like control over the diameter of the "bulb" of the thumbstick, the overall height of the bulb, and the resolution for the curve itself. I'd like to form this section using a `hull()` operation with two spheres.
*   **Thumb Recess:**  I'd like a spherical dimple on top for the thumb to rest in. The parameter for this should be the **diameter** of the sphere.

I'd like to be able to independently adjust the resolution for the inner cut, the collar, and the main thumbstick sections - this will help save processing time if some areas are not visible.

Could you create the OpenSCAD files for me? I’m not sure what libraries are available; I will specify them if needed.

[Assistant]
Customizable_Thumbsticks.scad:
```
/*
Customizable Thumbsticks for replacing/improving controllers.

    Harlo ~ 07/05/2016.
*/

//Inside Cut Height
inner_cut_length = 16; //[0:0.5:50]
//Inside Cut Diameter
inner_dia = 3.2; //[0:0.1:10]
//Inside Cut Resolution (4 for square)
inner_resolution = 32; //[4:1:120]

//Collar Height (Lower Cylinder)
lower_length = 4; //[0:0.25:10]
//Collar Diameter (OD)
lower_dia = 5.5; //[1:0.25:20]
//Collar Resolution
collar_resolution = 100; //[4:1:120]

//Overall Height
total_length = 20; //[10:0.25:50]
//Thumbstick Diameter
upper_dia = 12.5; //[5:0.25:25]
//Thumbstick Resolution
thumbstick_resolution = 12; //[8:1:120]

//Thumb Recess Diameter
dimple_dia = 8; //[0:0.5:20]

upper_length = total_length - lower_length;

difference(){
    thumbstick();
    inner_cutout();
    top_dimple();
}

module inner_cutout(){
    //-inner_cut_length/2
    translate([0,0,-(total_length/2 - inner_cut_length/2)]){
        cylinder(h = inner_cut_length, d1 = inner_dia, d2 = inner_dia - 0.5, center = true, $fn = inner_resolution);
    }

}

module top_dimple(){
    translate([0,0,2.5 + upper_length/2]){
        scale([1,1,1]){
            sphere(d = dimple_dia, $fn = thumbstick_resolution, center = true);
        }
    }
}

module thumbstick(){
    upper();
    translate([0,0,-upper_length/2]){
        attachment();
    }
}

module upper(){
    hull(){
        translate([0,0,upper_length/2]){
            scale([1,1,0.4]){
                sphere(d = upper_dia, $fn = thumbstick_resolution);
            }
        }

        translate([0,0,-(upper_length/2 - 0.1)]){
        cylinder(h = 0.1, d = lower_dia, $fn = collar_resolution);
        }
    }
}

module attachment(){

        cylinder(h = lower_length, d = lower_dia, $fn = collar_resolution, center = true);

}
```


[User]
I'm working on a parametric OpenSCAD design for a drink coaster, and I'd like your help to create the SCAD file(s) for it.

Here's what I have in mind:

The coaster should have an overall diameter of 3 inches and a height of 0.25 inches. It should have a circular indentation in the center to hold a cup, with the cup's diameter being 2.75 inches. I want the coaster to have smooth, rounded edges, which I understand can be achieved using the `minkowski()` function in OpenSCAD.

Additionally, I'd like to have an option to include an image on the surface of the coaster. If enabled, the image should be placed in the center of the coaster, with a side length of 2 inches. I have a 100x100 pixel `.dat` file that I'd like to use for the image. I'm not exactly sure how to get the image to work, but I think I have to use the `surface()` function for that.

Finally, I want the design to be flexible in terms of units. The user should be able to input their preferred unit (mm, cm, meter, inch, or foot), and the design should scale accordingly. The output should also allow the user to choose their desired unit.

To summarize, the key features I'm looking for are:

1. A drink coaster with a diameter of 3 inches and a height of 0.25 inches.
2. A circular indentation for a cup with a diameter of 2.75 inches.
3. Smooth, rounded edges using the `minkowski()` function.
4. An optional image on the coaster's surface (using a 100x100 pixel `.dat` file), with a side length of 2 inches.
5. The ability to specify input and output units (mm, cm, meter, inch, foot).
6. Adjustable resolution using a variable.

I'm not using any external libraries for this project, just built-in OpenSCAD functions.

Could you help me create a parametric OpenSCAD file (or files) that meets these requirements?

[Assistant]
drink_coaster.scad:
```
/* [coaster] */
height_of_coaster = .25;
diameter_of_coaster = 3;
diameter_of_cup = 2.75;
resoultion = 42;//[20:100]
/* [Image on coaster]*/
include_image = 1;//[0: yes, 1: no]
image_file = "image-surface.dat"; // [image_surface:100x100]
side_length_of_image = 2;
/* [Unit adjustment] */
//Basically are you using american units or real units
units_entered = 25.4;//[1:mm, 10:cm, 1000:meter, 25.4:inch, 304.8:foot]

//default is mm for most printers
desired_units_for_output = 1;//[1:mm, .1:cm, 0.001:meter, 0.0393701:inch, 0.00328084:foot]

//END CUSTOMIZER VARIABLES
unit_conversion_factor = units_entered*desired_units_for_output;
module drink_coaster(){
	minkowski(){
		cylinder(h = .0000000001, r = diameter_of_coaster/2-height_of_coaster,$fn = resoultion,center=true);
		sphere(height_of_coaster/2,$fn=resoultion,center=true);
	}
}
module indent_for_drink(){
	translate([0,0,height_of_coaster*.375])
		minkowski(){
			cylinder(h = .0000000001, r = diameter_of_cup/2-height_of_coaster,$fn = resoultion,center=true);
			sphere(height_of_coaster/2,$fn=resoultion,center=true);
		}
}

scale(unit_conversion_factor){
	difference(){
		drink_coaster();
		indent_for_drink();
		if(include_image == 0){
			translate([0, 0, 0]){
				resize([side_length_of_image,side_length_of_image,.1]){
					surface(file=image_file, center=true, convexity=10);
				}
			}
		}

	}
}
```


[User]
Hi, I'm looking to have a parametric tool maker's vise designed in OpenSCAD. I'd like it to be fairly similar in function to the one described in the code I've included, but I'd prefer it if the different parts were more modular and could be more easily adapted. I also want it to use the BOSL2 library, if possible.

Here are the key features I'm looking for:

*   **Parametric Design:** Everything should be adjustable via variables, such as the vise width, length, jaw heights, groove dimensions, bolt sizes, etc.
*   **Vise Base:** It should have a base with grooves along the sides for mounting and a center channel to guide the movable jaw. The base should also have an integrated fixed jaw.
*   **Movable Jaw:** This should slide within the center guide of the base and be secured using bolts that connect to a clamping piece. I'd like the movable jaw to have a central captive nut for the main clamping screw.
*   **Movable Jaw Clamp:** A piece that fits within the base's center guide and connects to the movable jaw via bolts.
*   **Jaws:** Both the fixed and movable jaws should optionally have V-grooves for holding round stock.
*   **Bolting:** The design needs to accommodate a threaded rod (with nut) for clamping and smaller bolts and nuts for connecting the movable jaw to the movable jaw clamp. I also want a knob at the end of the threaded rod.
*   **Libraries:** As mentioned, please use the BOSL2 library for any relevant features.
*   **Modularity:** Each of the main parts (base, movable jaw, clamp, bolt) should be designed as a separate module so they are easy to alter or move around within an assembly file.

I'd like a separate file for each main component (the vise base including fixed jaw and lead screw guide, movable jaw, movable jaw clamp, a threaded rod module, a module for a standard hex nut, and the bolt knob). And then an assembly file that combines these parts. Can you generate these files? Thanks!

[Assistant]
toolMakersVise.scad:
```
/***********************************************************************
Name ......... : toolMakersVise.scad
Description....: Parametric Tool Makers vise
Author ....... : Garrett Melenka
Version ...... : V1.0 2016/05/07
Licence ...... : GPL
***********************************************************************/
//Part Selection Dropdown Menu
part = 0; //[0:All, 1:Vise Base, 2: Movable Jaw,3: Movable Jaw Clamp, 4: Bolt Knob]

//Vise Width
viseWidth = 63.5; //[25.4:1", 50.8:2", 63.5:2.5", 76.2:3", 88.9:3.5", 101.6:4"]
//Vise Length
viseLength = 101; //[88.9:3.5", 101:4", 114.3:4.5", 127:5.0", 139.7:5.5", 152.4:6"]
//Height of Vise Base
viseBaseHeight = 20;

//Dimensions of Vise Grooves
//Width of Vise Groove
viseGrooveWidth = 10;
//Depth of Vise Groove
viseGrooveDepth = 10;
//Tolerance to be applied to grooves to ensure good fit
viseGrooveTolerance = 0.1;

//Width of slot along center of vise base
movableJawGuide = 20;

//V groove dimension for fixed and movable jaw
toolGroove = 5;
//Fixed Jaw Groove option
grooveSelectFixedJaw = 0; //[0:No Groove, 1:Groove]
//Movable Jaw Groove option
grooveSelectMovableJaw = 1; //[0:No Groove, 1:Groove]
//Height of Jaws
jawHeight = 40;
//Dimensions of Movable Jaw
//Width of Movable Jaw
movableJawWidth = viseWidth;
//Height of Movable Jaw
movableJawHeight = jawHeight;
//Movable Jaw Thickness
movableJawThickness = 20;

//Dimensions of Fixed Jaw
//Width of Fixed Jaw
fixedJawWidth = viseWidth;
//Fixed Jaw Height
fixedJawHeight = jawHeight;
//Fixed Jaw Thickness
fixedJawThickness = 20;

//movable Jaw Bolts
//Diameter of Bolt to connect Movable Jaw and Movable Jaw Clamp
movableJawBoltDiameter = 3.3;
//Length of Bolt to connect Movable Jaw and Movable Jaw Clamp
movableJawBoltLength = 25;
//Bolt head diameter
movableJawBoltHeadDiameter = 5.5;
//Bolt Head Thickness
movableJawBoltHeadLength = 3.0;
//Captive nuts to connect Movable Jaw to Movable Jaw Clamp
//Width of nut
movableJawNutWidth = 6.0;
//Thickness of nut
movableJawNutThickness = 2.75;
//Use scale factor to oversize central captive nut slot so that it spins freely
movableJawCaptiveNutScaleFactor = 1.2;

//Width of nut- measure corner to corner distance on nut
nutWidth = 14.75;
//Nut thickness- measure thickness of nut
nutThickness = 7.0;

//Dimensions of Nut and Bolt for securing parts in V block
//Diameter of bolt
boltDiameter = 8.25;
//boltLength = 101;
boltLength = viseLength - 2*fixedJawThickness+ movableJawThickness;
echo("Required Minimum Bolt Length:",boltLength);
//boltLength = 101;

//Diameter of Bolt Knob
boltKnobDiameter = 20;
//Height of Bolt Knob;
boltKnobLength = 30;
//Number of knurls around Knob Diameter
boltKnobKnurlNum = 15;
//Depth of knurls
boltKnobKnurlDepth = 1;
//Width of knurls
boltKnobKnurlWidth = 1;
//Angle of knurling
boltKnobKnurlAngle = 100;

module viseBase()
{
    union(){
    difference(){
    //create base of vise
    cube(size = [viseWidth, viseLength, viseBaseHeight], center = true);

    //create slots on side of vise
    translate([viseWidth*0.5-0.5*viseGrooveDepth-0.5*viseGrooveTolerance, 0,0]){
    cube(size = [viseGrooveWidth+viseGrooveTolerance, viseLength, viseGrooveDepth+viseGrooveTolerance], center = true);
    }
    translate([-viseWidth*0.5+0.5*viseGrooveDepth+0.5*viseGrooveTolerance, 0,0]){
    cube(size = [viseGrooveWidth+viseGrooveTolerance, viseLength, viseGrooveDepth+viseGrooveTolerance], center = true);

    }
    //create center slot in middle of vise
    cube([movableJawGuide+viseGrooveTolerance, viseLength-fixedJawThickness*2, viseBaseHeight], center = true);

    translate([viseGrooveDepth, 0, -viseGrooveWidth]){
    cube([viseGrooveDepth+viseGrooveTolerance, viseLength-fixedJawThickness*2, viseGrooveWidth+viseGrooveTolerance], center = true);
    }

    translate([-viseGrooveDepth, 0, -viseGrooveWidth]){
    cube([viseGrooveDepth+viseGrooveTolerance, viseLength-fixedJawThickness*2, viseGrooveWidth+viseGrooveTolerance], center = true);
    }
    }

    //Create Vise Fixed Jaw
    translate([0, viseLength*0.5-0.5*fixedJawThickness, viseBaseHeight*0.5+0.5*fixedJawHeight]){
    viseFixedJaw();
    }

    //Create lead screw guide wall
    translate([0, -viseLength*0.5+0.5*fixedJawThickness, viseBaseHeight*0.5+0.5*fixedJawHeight])
    {
    viseLeadScrewGuide();
    }
    }

}

module viseFixedJaw()
{
    //create vise fixed jaw
    difference()
    {
    cube(size = [fixedJawWidth, fixedJawThickness, fixedJawHeight], center = true);
    // Add grooves for holding round work
    if (grooveSelectFixedJaw == 1)
    {
    translate([0,-fixedJawThickness*0.5, 0]){
    rotate([45,0,0]){
    cube(size = [fixedJawWidth, toolGroove, toolGroove], center = true);
    }

    rotate([0,0,45]){
    cube(size = [toolGroove, toolGroove, fixedJawHeight], center = true);
    }

}
}
}

}

module viseLeadScrewGuide()
{
    //create vise lead screw guide wall
    difference(){
    cube(size = [fixedJawWidth, fixedJawThickness, fixedJawHeight], center = true);
    //create hole for lead screw and lead screw nut
     mirror([0,1,0]){
    translate([0, nutThickness*0.5-0.1,0])
    {
    rotate([90,0,0]){
    cylinder(r = boltDiameter*0.5, h =  fixedJawThickness, center = true);

    translate([0,0,fixedJawThickness*0.5]){
    cylinder(r = nutWidth*0.5, h= nutThickness, center = true, $fn = 6);
    }
    }
    }
}
    }
}

module viseMovableJaw()
{

    difference()
    {
    union(){
    cube(size = [movableJawWidth, movableJawThickness,movableJawHeight], center = true);

    translate([0,0,-0.5*(movableJawHeight)-0.5*(viseBaseHeight-viseGrooveDepth)])
        {
    cube(size = [movableJawGuide, movableJawThickness, viseBaseHeight], center = true);
    }
    }

    //Add two holes to connect movable jaw to movable jaw guide
    translate([movableJawGuide*0.25, 0, -0.5*movableJawHeight-(viseBaseHeight)])
    {
    cylinder(r = movableJawBoltDiameter*0.5, h = movableJawBoltLength, center =false);
    }

    translate([-movableJawGuide*0.25, 0, -0.5*movableJawHeight-(viseBaseHeight)])
    {
    cylinder(r = movableJawBoltDiameter*0.5, h = movableJawBoltLength, center =false);
    }
    //Add two slots for captive nuts
    translate([movableJawGuide*0.25,movableJawThickness*0.25, -movableJawHeight*0.5-0.5*movableJawNutThickness-0.5*viseBaseHeight*0.5]){
    cube(size = [movableJawNutWidth, movableJawThickness, movableJawNutThickness], center = true);
    }

    translate([-movableJawGuide*0.25,movableJawThickness*0.25, -movableJawHeight*0.5-0.5*movableJawNutThickness-0.5*viseBaseHeight*0.5]){
    cube(size = [movableJawNutWidth, movableJawThickness, movableJawNutThickness], center = true);
    }

    //Add grooves to movable jaw to hold round work
    if (grooveSelectMovableJaw == 1)
    {
    translate([0,movableJawThickness*0.5, 0]){
    rotate([45,0,0]){
    cube(size = [fixedJawWidth, toolGroove, toolGroove], center = true);
    }

    rotate([0,0,45]){
    cube(size = [toolGroove, toolGroove, fixedJawHeight], center = true);
    }
    }
    }

    //Add hole to allow for a 5/16-18 captive nut in center of movable jaw
    //nut width is oversized to allow for free rotation
    rotate([90,0,0]){
    cylinder(r = boltDiameter*0.5, h =  fixedJawThickness, center = false);
    }

   //cylinder(r = boltDiameter*0.5, h = movableJawThickness*0.5, center = true);

    translate([-nutWidth*movableJawCaptiveNutScaleFactor*0.5, -nutThickness*0.5,-0.25*movableJawHeight]){
    cube(size = [nutWidth*movableJawCaptiveNutScaleFactor, nutThickness*1.1, movableJawHeight*0.75], center = false);
    }
 }
}

module viseMovableJawClamp()
{
    difference(){
    cube([movableJawGuide+viseGrooveDepth, movableJawThickness-viseGrooveTolerance, viseGrooveDepth*0.5-viseGrooveTolerance], center = true);

    translate([-movableJawGuide*0.25, 0,-0.5*viseGrooveDepth])
    {
    cylinder(r = movableJawBoltDiameter*0.5, h = movableJawBoltLength, center =false);
    }

    translate([movableJawGuide*0.25, 0,-0.5*viseGrooveDepth])
    {
    cylinder(r = movableJawBoltDiameter*0.5, h = movableJawBoltLength, center =false);
    }
    translate([movableJawGuide*0.25, 0,-0.25*viseGrooveDepth])
    {
    cylinder(r= movableJawBoltHeadDiameter*0.5, h=movableJawBoltHeadLength);
    }
    translate([-movableJawGuide*0.25, 0,-0.25*viseGrooveDepth])
    {
    cylinder(r= movableJawBoltHeadDiameter*0.5, h=movableJawBoltHeadLength);
    }
}

}

module threadedRod()
{

    cylinder(r = boltDiameter*0.5, h = boltLength, center = true);

}

//********************************************************************************
//Nut which is glued into vise
//********************************************************************************
module nut()
{
    difference(){
    cylinder(r=nutWidth*0.5, h = nutThickness, center = true, $fn=6);

    cylinder(r = boltDiameter*0.5, h=nutThickness, center = true);
    }

}

//********************************************************************************
//Knob that allows for the bolt to be adjusted
//********************************************************************************
module boltKnob()
{

    if(boltKnobDiameter> nutWidth)
    {

    difference(){
    cylinder(r=boltKnobDiameter*0.5, h=boltKnobLength, center = true);
    translate([0,0,-(boltKnobLength*0.5)+nutThickness*0.5]){
    cylinder(r= nutWidth*0.5, h = nutThickness, center = true, $fn=6);
    }

    //translate([boltKnobDiameter*0.5, 0,0])

    for (i = [1:1:boltKnobKnurlNum])

    rotate([0,0,360*i/boltKnobKnurlNum]){
    {

        linear_extrude(height = boltKnobLength, center = true, twist = boltKnobKnurlAngle){
            translate([boltKnobDiameter*0.5, 0,0]){
        square(size = [boltKnobKnurlDepth,boltKnobKnurlWidth], center = true);
            }
        }

        linear_extrude(height = boltKnobLength, center = true, twist = -boltKnobKnurlAngle){
            translate([boltKnobDiameter*0.5, 0,0]){
        square(size = [boltKnobKnurlDepth,boltKnobKnurlWidth], center = true);
            }
        }
    //cube(size = [2,2, boltKnobLength], center = true);
    }
    }
}
}
    else
    {
        echo("Knob diameter is less than nut width");
    }
}

//********************************************************************************
//Rendering and Display of Parts
//********************************************************************************
$fn = 60;
if (part == 0)
{
//Display Assembly
color("white")
viseBase();
//Display nut
translate([0,-viseLength*0.5+fixedJawThickness-nutThickness*0.5,viseBaseHeight*0.5+fixedJawHeight*0.5]){
rotate([90,0,0]){
color("red")
nut();
}
}
 //Display threaded rod
translate([0,-boltLength*0.5, viseBaseHeight*0.5 +  fixedJawHeight*0.5]){
rotate([90,0,0]){
color("green")
threadedRod();
//Display nut
translate([0,0,boltLength*0.5-nutThickness*0.5]){
color("red")
nut();
}
//Display bolt knob
translate([0,0,boltLength*0.5+boltKnobLength*0.5-nutThickness]){
color("blue")
boltKnob();
}
}
}
color("cyan")
translate([0,0,-viseBaseHeight*0.5+viseGrooveDepth*0.25]){
viseMovableJawClamp();
}

//Display movable jaw
translate([0,0,movableJawHeight*0.5+viseBaseHeight*0.5])
    {
    viseMovableJaw();
    }

}

if (part == 1)
{
    viseBase();
}

if (part == 2)
{
    rotate([180,0,0]){
    viseMovableJaw();
    }
}

if (part == 3)
{
    rotate([180,0,0]){
    viseMovableJawClamp();
    }
}

if (part == 4)
{
    rotate([180,0,0]){
    boltKnob();
    }
}

```


[User]
I'm looking to create a parametric chess set that doubles as a soccer ball puzzle, similar to the one described in the Thingiverse link you can find in the description (http://www.thingiverse.com/thing:1534279). I'd like the design to be flexible enough to adjust the overall size, the thickness of the pieces, and the spacing between them.

Here's a breakdown of the key features I need:

*   **Geometric Basis:** The design should be based on a truncated icosahedron (soccer ball) composed of pentagonal and hexagonal pieces.
*   **Parametric Size:**  I need to be able to easily adjust the overall radius of the soccer ball.
*   **Variable Thickness:** The thickness of the individual pieces should be adjustable.
*   **Adjustable Spacing:** The gap between the puzzle pieces should also be a parameter.
*   **Chess Symbols:**  Each piece needs to display a chess symbol, and the font should be MS Gothic.  I need to be able to toggle between black and white sets, so the symbols should be parameterized accordingly (white pieces should have white chess symbols, and black pieces should have black chess symbols). The symbols need to appear within the pieces, not on top.
*   **Concave Options:**  I would like to be able to specify if the concavity is on the pentagon side or the hexagon side, so I can have both options for the puzzle.
*   **Individual Piece Generation:** I need to be able to generate individual pieces, not just the entire puzzle. There should be options for both pentagonal and hexagonal pieces, with the chess symbols. These should be centered. I'm also interested in creating a version of the individual hexagonal piece that only contains the circles.
*  **Single Text Pieces:** I also want to be able to generate single pieces that display a specific text for each hexagon or pentagon.

It should be implemented using OpenSCAD. I'm not using any libraries. I am looking for the complete set of OpenSCAD files necessary to achieve this design, as if I was starting with a blank OpenSCAD project.

[Assistant]
chess_puzzle_soccer.scad:
```
radius = 30;
piece_set = "black"; // [black, white]
spacing = 0.3;
shell_thickness = 3;

// create a generalized pentagon by length.
// Parameters:
//     length : the side length
//     spacing : the gap between a pentagon or a hexagon
module generalized_pentagon(length, spacing = 0.5) {
    r = 0.5 * length / sin(36);
	s = (r - spacing / 2) / r;

    color("black")
	    rotate(18)
		     linear_extrude(length, scale = 1.42215)
		        scale([s, s, s])
			        children();
}

// create a generalized hexagon by length.
// Parameters:
//     length : the side length
//     spacing : the gap between a pentagon or a hexagon
module generalized_hexagon(length, spacing = 0.5) {
    r = 0.5 * length / sin(30);
	s = (r - spacing / 2) / r;

    color("white")
	     linear_extrude(length - length * 0.02125, scale = 1.42215)
		    scale([s, s, s])
		        children();
}

// a placeholder pentagon, one generalized pentagon and two generalized hexagons.
// Parameters:
//     length : the side length
//     spacing : the gap between the pentagon and hexagon
module generalized_pentagon_based_sub_comp(length, spacing = 0.5) {
	pentagon_circle_r = 0.5 * length / sin(36);

	a = 37.325;

	offset_y = 0.5 * length * tan(54) + pentagon_circle_r * cos(a);
	offset_z = 0.5 * length * tan(60) * sin(a);

	translate([0, -offset_y, -offset_z])
	    rotate([a, 0, 0])
		    generalized_hexagon_based_sub_comp(length, spacing) {
			    children(0);
				children(1);
			}
}

// two generalized hexagons and one generalized pentagon.
// Parameters:
//     length : the side length
//     spacing : the gap between the pentagon and hexagon
module generalized_hexagon_based_sub_comp(length, spacing = 0.5) {
    children(1);

	length_center_to_side = 0.5 * length * tan(54);

    a = -37.325;

	offset_y = 0.5 * length * (tan(54) * cos(a) + tan(60));
	offset_z = length_center_to_side * sin(a);

	rotate(120) translate([0, offset_y, offset_z])
	    rotate([a, 0, 0])
	        generalized_pentagon_hexagon(length, spacing) {
			    children(0);
			    children(1);
			}

}

// a generalized pentagon and a generalized hexagon.
// Parameters:
//     length : the side length
//     spacing : the gap between the pentagon and hexagon
module generalized_pentagon_hexagon(length, spacing = 0.5) {
	pentagon_circle_r = 0.5 * length / sin(36);

	children(0);

	a = 37.325;

	offset_y = 0.5 * length * tan(54) + pentagon_circle_r * cos(a);
	offset_z = 0.5 * length * tan(60) * sin(a);

	rotate(144) translate([0, -offset_y, -offset_z])
	    rotate([a, 0, 0])
		    children(1);
}

// a half of generalized soccer polyhedron.
// Parameters:
//     line_length : the side length of pentagons and hexagons
//     spacing : the gap between the pentagon and hexagon
module generalized_half_soccer_polyhedron(line_length, spacing = 0.5) {
	pentagon_circle_r = 0.5 * line_length / sin(36);
	offset_y = pentagon_circle_r * cos(36);

	children(0);

	for(i = [0:4]) {
		rotate(72 * i)
		    generalized_pentagon_based_sub_comp(line_length, spacing) {
			    children(0);
				children(1);
			}
	}
}

// a generalized soccer polyhedron.
// Parameters:
//     line_length : the side length of pentagons and hexagons
//     spacing : the gap between the pentagon and hexagon
//     center : center it or not
module generalized_soccer_polyhedron(height, spacing = 0.5, center = true) {
    line_length = height / 6.65;

	offset_for_center = center ? height / 2: 0;

	translate([0, 0, -offset_for_center]) union() {
		translate([0, 0, -line_length + line_length * 6.64875])
		    generalized_half_soccer_polyhedron(line_length, spacing) {
			    generalized_pentagon(line_length, spacing) children(0);
			    generalized_hexagon(line_length, spacing) children(1);
			}

		rotate(36) mirror([0, 0, 1]) translate([0, 0, -line_length])
		    generalized_half_soccer_polyhedron(line_length, spacing) {
			    generalized_pentagon(line_length, spacing) children(0);
			    generalized_hexagon(line_length, spacing) children(1);
			}
	}
}

// create a pentagon according the height of the soccer polyhedron
module pentagon_for_soccer_polyhedron(height) {
    line_length = height / 6.65;
    circle(0.5 * line_length / sin(36), $fn = 5);
}

// create a hexagon according the height of the soccer polyhedron
module hexagon_for_soccer_polyhedron(height) {
    line_length = height / 6.65;
    r = 0.5 * line_length / sin(30);

    circle(r, $fn = 6);
}

// =================================================================

// create a pentagon according the height of a soccer puzzle
module pentagon_for_soccer_puzzle(height, spacing) {
    line_length = height / 6.65;
	r = 0.5 * line_length / sin(36);
	s = (r - spacing * 4) / r;

	difference() {
		circle(r, $fn = 5);

		for(i = [1:2:9]) {
		    rotate(36 * i)
			    translate([r / 1.4, 0, 0])
		            circle(r / 4.5, $fn = 48);
		}
	}

	for(i = [1:2:9]) {
	    rotate(36 * i)
		    translate([r / 1.4, 0, 0])
			    scale([s, s, s])
				    circle(r / 4.5, $fn = 48);
	}
}

// create a hexagon according the height of a soccer puzzle
module hexagon_for_soccer_puzzle(height, spacing) {
    line_length = height / 6.65;
    r = 0.5 * line_length / sin(30);
	s = (r - spacing * 4) / r;

	difference() {
		circle(r, $fn = 6);

		for(i = [0:2]) {
			rotate(90 + i * 120)
				translate([r / 1.325, 0, 0])
					circle(r / 4.5, $fn = 48);
		}
	}

	for(i = [0:2]) {
		rotate(90 + i * 120)
			translate([r / 1.325, 0, 0])
				scale([s, s, 1])
				    circle(r / 4.5, $fn = 48);
	}
}

// create a soccer puzzle
module soccer_puzzle(radius, concave, shell_thickness, spacing) {

	height = (radius + 2) * 2;

	difference() {
		intersection() {
		    if(concave == "pentagon") {
				generalized_soccer_polyhedron(height, spacing) {
					pentagon_for_soccer_puzzle(height, spacing);
					hexagon_for_soccer_polyhedron(height);
				}
			} else if(concave == "hexagon") {
				generalized_soccer_polyhedron(height, spacing) {
				    pentagon_for_soccer_polyhedron(height);
				    hexagon_for_soccer_puzzle(height, spacing);
			    }
			}

			sphere(radius, $fn = 48);
		}

		sphere(radius - shell_thickness, $fn = 48);
	}
}

// ==================================================================

// a generalized pentagon and a generalized hexagon for a puzzle.
// Parameters:
//     length : the side length
//     spacing : the gap between the pentagon and hexagon
module generalized_pentagon_based_sub_for_puzzle(length, spacing = 0.5) {
	pentagon_circle_r = 0.5 * length / sin(36);

	generalized_pentagon(length, spacing) children(0);

	a = 37.325;

	offset_y = 0.5 * length * tan(54) + pentagon_circle_r * cos(a);
	offset_z = 0.5 * length * tan(60) * sin(a);

	for(i = [0:4]) {
		rotate(72 * i) translate([0, -offset_y, -offset_z])
			rotate([a, 0, 0])
				generalized_hexagon(length, spacing) children(1);
	}
}

module pentagon_puzzle(radius, shell_thickness, spacing) {
    height = (radius + 2) * 2;
    line_length = height / 6.65;

	difference() {
		intersection() {
			translate([0, 0, line_length * 5.64875  -height / 2])
				generalized_pentagon_based_sub_for_puzzle(line_length, spacing) {
    pentagon_for_soccer_polyhedron(height);
	hexagon_for_single_soccer_puzzle_circles_only(height, spacing);
}

			sphere(radius, $fn = 48);
		}
		sphere(radius - shell_thickness, $fn = 48);
	}
}

// create a hexagon according the height of the soccer polyhedron
module hexagon_for_single_soccer_puzzle(height, spacing) {
    line_length = height / 6.65;
    r = 0.5 * line_length / sin(30);

	difference() {
		circle(r, $fn = 6);

		for(i = [0:2]) {
			rotate(90 + i * 120)
				translate([r / 1.325, 0, 0])
					circle(r / 4.5, $fn = 48);
		}
	}
}

// create circles around a hexagon according the height of the soccer polyhedron
module hexagon_for_single_soccer_puzzle_circles_only(height, spacing) {
    line_length = height / 6.65;
    r = 0.5 * line_length / sin(30);
	s = (r - spacing * 4) / r;

	rotate(90)
		translate([r / 1.325, 0, 0])
			scale([s, s, 1])
				circle(r / 4.5, $fn = 48);
}

module hexagon_puzzle(radius, shell_thickness, spacing) {
    height = (radius + 2) * 2;
    line_length = height / 6.65;

	//rotate([37.325, 0, 0])
	difference() {
		intersection() {
			translate([0, 0, line_length * 5.5836  -height / 2])
				generalized_hexagon(height / 6.65, spacing)
				    hexagon_for_single_soccer_puzzle(height, spacing);

			sphere(radius, $fn = 48);
		}
		sphere(radius - shell_thickness, $fn = 48);
	}
}

// ==================================================================

// create a pentagon according the height of the soccer polyhedron
module pentagon_for_soccer_puzzle_with_text(height, text) {
	difference() {
		pentagon_for_soccer_polyhedron(height);
		rotate(-18) text(text, font = "MS Gothic", valign = "center", halign = "center", size = height / 7);
	}
}

module pentagon_puzzle_with_text(radius, text, shell_thickness, spacing) {
    height = (radius + 2) * 2;
    line_length = height / 6.65;

	difference() {
		intersection() {
			translate([0, 0, line_length * 5.64875  -height / 2])
				generalized_pentagon_based_sub_for_puzzle(line_length, spacing) {
    pentagon_for_soccer_puzzle_with_text(height, text);
	hexagon_for_single_soccer_puzzle_circles_only(height, spacing);
}

			sphere(radius, $fn = 48);
		}
		sphere(radius - shell_thickness, $fn = 48);
	}

	pentagon_puzzle(radius - 1, shell_thickness - 1, spacing);
}

// create a hexagon according the height of the soccer polyhedron
module hexagon_for_single_soccer_puzzle_with_text(height, text, spacing) {
	difference() {
		hexagon_for_single_soccer_puzzle(height, spacing);
		translate([0, -height / 45, 0]) rotate(180) text(text, font = "MS Gothic", valign = "center", halign = "center", size = height / 7);
	}
}

module hexagon_puzzle_with_text(radius, text, shell_thickness, spacing) {
    height = (radius + 2) * 2;
    line_length = height / 6.65;

	difference() {
		intersection() {
			translate([0, 0, line_length * 5.5836  -height / 2])
				generalized_hexagon(height / 6.65, spacing)
				    hexagon_for_single_soccer_puzzle_with_text(height, text, spacing);

			sphere(radius, $fn = 48);
		}
		sphere(radius - shell_thickness, $fn = 48);
	}
	hexagon_puzzle(radius - 1, shell_thickness - 1, spacing);
}

module pieces(radius, black_or_white, shell_thickness, spacing) {
    offset = 0.85 * radius;

	ps = black_or_white == "black" ? "♟♜♞♝♚♛" : "♙♖♘♗♔♕";

	for(i = [0:3]) {
	    for(j = [0:1]) {
			translate([offset * i, offset * j, 0])
   			    hexagon_puzzle_with_text(radius, ps[0], shell_thickness, spacing);
		}
	}

	for(i = [0:1]) {
		translate([offset * i, offset * 2, 0])
			hexagon_puzzle_with_text(radius, ps[1], shell_thickness, spacing);
	}

	for(i = [2:3]) {
		translate([offset * i, offset * 2, 0])
		    pentagon_puzzle_with_text(radius, ps[2], shell_thickness, spacing);
	}

	for(i = [0:1]) {
		translate([offset * i, offset * 3, 0])
		    pentagon_puzzle_with_text(radius, ps[3], shell_thickness, spacing);
	}

	translate([offset * 2, offset * 3, 0])
    	pentagon_puzzle_with_text(radius, ps[4], shell_thickness, spacing);

	translate([offset * 3, offset * 3, 0])
    	pentagon_puzzle_with_text(radius, ps[5], shell_thickness, spacing);
}

pieces(radius, piece_set, shell_thickness, spacing);

```


[User]
I'm looking to design a modular hose system with various fittings, and I'd like to use OpenSCAD to make it parametric. I've got a basic idea of the fittings I want, and I'd like to be able to choose between different connection types – ball, socket, or tube adapter – on each end. I need to specify the internal diameter of each connection, and for some fittings, I need to adjust the length/size of the fitting. Also, I'd like to be able to specify an angle when building 2-way or 3-way connectors, so I can make elbows and T shapes.

Here are the specific fittings I'm looking for:

*   **Basic:** A simple straight connector with a user-selectable fitting type on each end (ball, socket, or tube adapter), and a single internal diameter to control the hole running through it.
*   **2-way:** An elbow-like connector that takes an internal diameter and fitting type for each end. It also should have an angle parameter and a length parameter for each side of the elbow.
*   **3-way:** A T- or Y-shaped connector. It should have internal diameter, fitting type, and length parameters for all three ends, as well as an angle parameter (though it should only adjust the angle of one arm - the other should remain fixed).
*   **Cap:** A cap to plug a connector; it should have one internal diameter and automatically use the socket-type connection.
*   **Base:** A base piece, with a flat face and a connection port. The port should have an internal diameter and a user-selectable connection type.
*   **Gate:** A gate-style valve. The gate should be a simple sliding piece (see below), and the main body of the valve should have a user-selectable fitting type and internal diameter on each side.
*   **Slide (for gate):** The sliding piece that goes inside the gate valve, with a single internal diameter.
*  **Nozzle:** A simple nozzle fitting, it should scale out using two different scaling parameters on the X and Y axes. It should also be able to have different fitting types.
*  **Valve (part a):** This is part of a screw-type valve, and should have a hole running through it with a small side-port. It has a single internal diameter.
*  **Valve (part b):** This is the second half of the screw-type valve, and screws into part a. It should have fitting ports on either side of the cylinder for connecting to other pieces. It should have a single internal diameter.

For all parts, I need to set a global wall thickness and a tolerance value for fitting parts together. I think 2mm for wall thickness and 0.3mm for tolerance would be fine for now. Also, please use `$fn = 100;` for increased smoothness, and add a small delta value (I suggest 0.01mm) to adjust any cuts to avoid z-fighting.

I'd also like a way to cut away sections of the model for previewing internal geometry, by specifying a simple parameter to enable/disable the cutaway.

I think that's it, please let me know if I forgot something or if you have any questions!

[Assistant]
Modular_Hose_Current.scad:
```
// preview[view:south, tilt:side]

select_part =                   "Basic"; //[Basic, 2-way, 3-way, Cap, Base, Gate, Slide (for gate), Nozzle, Valve (part a), Valve (part b)]

//Allows for viewing internal geometry.
cut_away =                         "No"; //[Yes, No]

//Required for 2/3-way parts (eg. 90 for a T shape 3-way or elbow 2-way)
angle =                              90; //[45:180]

//Required for most parts.
fitting_1 =                           0; //[0:Ball, 1:Socket, 2:Tube Adapter]
//Required for 2/3-way parts, and gate.
fitting_2 =                           1; //[0:Ball, 1:Socket, 2:Tube Adapter]
//Required for 3-way parts only.
fitting_3 =                           2; //[0:Ball, 1:Socket, 2:Tube Adapter]

//Required for all parts. (1 Inch = 25.4 mm)
internal_diameter_1 =                10; //[5:0.1:50]
//Required for 2/3-way parts. (1 Inch = 25.4 mm)
internal_diameter_2 =                10; //[5:0.1:50]
//Required for 3-way parts only. (1 Inch = 25.4 mm)
internal_diameter_3 =                10; //[5:0.1:50]

//Required for length of 2/3-way parts, and height of nozzle.
size_1 =                              0; //[0:0.1:100]
//Required for 2/3-way parts, and X-scaling of nozzle.
size_2 =                              0; //[0:0.1:100]
//Required for 3-way parts, and Y-scaling of nozzle.
size_3 =                              0; //[0:0.1:100]

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

delta =                            0.01;

wall =                                2;

tolerance =                         0.3;

module ball(internal_diameter){
    rotate([180,0,0])
    translate([0,0,internal_diameter-tolerance/2])
    difference(){
        union(){
            sphere(d=2*internal_diameter-tolerance);

            rotate([180,0,0])
            cylinder(h=internal_diameter-tolerance/2, d=internal_diameter+2*wall);
        }
        union(){
            translate([0,0,-internal_diameter+tolerance/2-delta])
            cylinder(h=2*internal_diameter-tolerance+2*delta, d=internal_diameter);
        }
    }
}

module socket(internal_diameter){
    translate([0,0,-internal_diameter-wall])
    difference(){
        union(){
            sphere(d=2*internal_diameter+2*wall);

            cylinder(h=internal_diameter+wall, d1=2*internal_diameter+2*wall, d2=internal_diameter+2*wall);
        }
        union(){
            sphere(d=2*internal_diameter+tolerance);

            cylinder(h=internal_diameter+wall+delta, d=internal_diameter);

            translate([0,0,-internal_diameter-wall-delta])
            cylinder(h=0.75*internal_diameter+wall+delta, d=2*internal_diameter+2*wall);
        }
    }
}

module tube_adapter(internal_diameter){
    rotate([180,0,0])
    difference(){
        union(){
            cylinder(h=0.5*internal_diameter, d=internal_diameter+2*wall);

            translate([0,0,0.5*internal_diameter])
            cylinder(h=0.5*internal_diameter, d1=internal_diameter+3*wall, d2=internal_diameter+2*wall);

            translate([0,0,internal_diameter])
            cylinder(h=0.5*internal_diameter, d1=internal_diameter+3*wall, d2=internal_diameter+2*wall);

            translate([0,0,1.5*internal_diameter])
            cylinder(h=0.5*internal_diameter, d1=internal_diameter+3*wall, d2=internal_diameter+2*wall);
        }
        union(){
            translate([0,0,-delta])
            cylinder(h=2*internal_diameter+2*delta, d=internal_diameter);
        }
    }
}

module basic(){
    rotate([180,0,0])
    ball(internal_diameter_1);

    socket(internal_diameter_1);
}

module 2_way(){
    difference(){
        union(){
            translate([(internal_diameter_1+internal_diameter_2)/4+wall,0,-(internal_diameter_1+internal_diameter_2)/4-size_1])
            cylinder(h=(internal_diameter_1+internal_diameter_2)/4+size_1, d1=internal_diameter_1+2*wall, d2=(internal_diameter_1+internal_diameter_2)/2+2*wall);

            rotate([0,180+angle,0])
            translate([(internal_diameter_1+internal_diameter_2)/4+wall,0,0])
            cylinder(h=(internal_diameter_1+internal_diameter_2)/4+size_2, d1=(internal_diameter_1+internal_diameter_2)/2+2*wall, d2=internal_diameter_2+2*wall);
        }

        union(){
            translate([(internal_diameter_1+internal_diameter_2)/4+wall,0,-(internal_diameter_1+internal_diameter_2)/4-size_1-delta])
            cylinder(h=(internal_diameter_1+internal_diameter_2)/4+size_1+2*delta, d1=internal_diameter_1, d2=(internal_diameter_1+internal_diameter_2)/2);

            rotate([0,180+angle,0])
            translate([(internal_diameter_1+internal_diameter_2)/4+wall,0,-delta])
            cylinder(h=(internal_diameter_1+internal_diameter_2)/4+size_2+2*delta, d1=(internal_diameter_1+internal_diameter_2)/2, d2=internal_diameter_2);
        }
    }

    rotate([90,0,0])
    difference(){
        union(){
            rotate_extrude()
            translate([(internal_diameter_1+internal_diameter_2)/4+wall,0,0])
            circle(d=(internal_diameter_1+internal_diameter_2)/2+2*wall);
        }
        union(){
            rotate_extrude()
            translate([(internal_diameter_1+internal_diameter_2)/4+wall,0,0])
            circle(d=(internal_diameter_1+internal_diameter_2)/2);

            translate([0,-150/2,0])
            cube(150, center=true);

            rotate([0,0,-angle])
            translate([0,-150/2,0])
            cube(150, center=true);
        }
    }

    translate([(internal_diameter_1+internal_diameter_2)/4+wall,0,-(internal_diameter_1+internal_diameter_2)/4-size_1])
    if (fitting_1 == 0){
        ball(internal_diameter_1);
    }
    else if (fitting_1 == 1){
        socket(internal_diameter_1);
    }
    else if (fitting_1 == 2){
        tube_adapter(internal_diameter_1);
    }

    rotate([0,angle,0])
    translate([-(internal_diameter_1+internal_diameter_2)/4-wall,0,-(internal_diameter_1+internal_diameter_2)/4-size_2])
    if (fitting_2 == 0){
        ball(internal_diameter_2);
    }
    else if (fitting_2 == 1){
        socket(internal_diameter_2);
    }
    else if (fitting_2 == 2){
        tube_adapter(internal_diameter_2);
    }
}

module 3_way(){
    difference(){
        union(){
            translate([(internal_diameter_1+internal_diameter_2+internal_diameter_3)/6+wall,0,-(internal_diameter_1+internal_diameter_2+internal_diameter_3)/6-size_1])
            cylinder(h=(internal_diameter_1+internal_diameter_2+internal_diameter_3)/6+size_1, d1=internal_diameter_1+2*wall, d2=(internal_diameter_1+internal_diameter_2+internal_diameter_3)/3+2*wall);

            rotate([0,180+angle,0])
            translate([(internal_diameter_1+internal_diameter_2+internal_diameter_3)/6+wall,0,0])
            cylinder(h=(internal_diameter_1+internal_diameter_2+internal_diameter_3)/6+size_2, d1=(internal_diameter_1+internal_diameter_2+internal_diameter_3)/3+2*wall, d2=internal_diameter_2+2*wall);

            translate([(internal_diameter_1+internal_diameter_2+internal_diameter_3)/3+2*wall,0,0])
            rotate([0,180-angle,0])
            translate([-(internal_diameter_1+internal_diameter_2+internal_diameter_3)/6-wall,0,0])
            cylinder(h=(internal_diameter_1+internal_diameter_2+internal_diameter_3)/6+size_3, d1=(internal_diameter_1+internal_diameter_2+internal_diameter_3)/3+2*wall, d2=internal_diameter_3+2*wall);
        }

        union(){
            translate([(internal_diameter_1+internal_diameter_2+internal_diameter_3)/6+wall,0,-(internal_diameter_1+internal_diameter_2+internal_diameter_3)/6-size_1-delta])
            cylinder(h=(internal_diameter_1+internal_diameter_2+internal_diameter_3)/6+size_1+2*delta, d1=internal_diameter_1, d2=(internal_diameter_1+internal_diameter_2+internal_diameter_3)/3);

            rotate([0,180+angle,0])
            translate([(internal_diameter_1+internal_diameter_2+internal_diameter_3)/6+wall,0,-delta])
            cylinder(h=(internal_diameter_1+internal_diameter_2+internal_diameter_3)/6+size_2+2*delta, d1=(internal_diameter_1+internal_diameter_2+internal_diameter_3)/3, d2=internal_diameter_2);

            translate([(internal_diameter_1+internal_diameter_2+internal_diameter_3)/3+2*wall,0,0])
            rotate([0,180-angle,0])
            translate([-(internal_diameter_1+internal_diameter_2+internal_diameter_3)/6-wall,0,-delta])
            cylinder(h=(internal_diameter_1+internal_diameter_2+internal_diameter_3)/6+size_3+2*delta, d1=(internal_diameter_1+internal_diameter_2+internal_diameter_3)/3, d2=internal_diameter_3);
        }
    }

    rotate([90,0,0])
    difference(){
        union(){
            rotate_extrude()
            translate([(internal_diameter_1+internal_diameter_2+internal_diameter_3)/6+wall,0,0])
            circle(d=(internal_diameter_1+internal_diameter_2+internal_diameter_3)/3+2*wall);

            translate([(internal_diameter_1+internal_diameter_2+internal_diameter_3)/3+2*wall,0,0])
            rotate_extrude()
            translate([(internal_diameter_1+internal_diameter_2+internal_diameter_3)/6+wall,0,0])
            circle(d=(internal_diameter_1+internal_diameter_2+internal_diameter_3)/3+2*wall);
        }
        union(){
            rotate_extrude()
            translate([(internal_diameter_1+internal_diameter_2+internal_diameter_3)/6+wall,0,0])
            circle(d=(internal_diameter_1+internal_diameter_2+internal_diameter_3)/3);

            translate([(internal_diameter_1+internal_diameter_2+internal_diameter_3)/3+2*wall,0,0])
            rotate_extrude()
            translate([(internal_diameter_1+internal_diameter_2+internal_diameter_3)/6+wall,0,0])
            circle(d=(internal_diameter_1+internal_diameter_2+internal_diameter_3)/3);

            translate([0,-150/2,0])
            cube(150, center=true);

            rotate([0,0,-angle])
            translate([0,-150/2,0])
            cube(150, center=true);

            translate([(internal_diameter_1+internal_diameter_2+internal_diameter_3)/3+2*wall,0,0])
            rotate([0,0,angle])
            translate([0,-150/2,0])
            cube(150, center=true);
        }
    }

    translate([(internal_diameter_1+internal_diameter_2+internal_diameter_3)/6+wall,0,-(internal_diameter_1+internal_diameter_2+internal_diameter_3)/6-size_1])
    if (fitting_1 == 0){
        ball(internal_diameter_1);
    }
    else if (fitting_1 == 1){
        socket(internal_diameter_1);
    }
    else if (fitting_1 == 2){
        tube_adapter(internal_diameter_1);
    }

    rotate([0,angle,0])
    translate([-(internal_diameter_1+internal_diameter_2+internal_diameter_3)/6-wall,0,-(internal_diameter_1+internal_diameter_2+internal_diameter_3)/6-size_2])
    if (fitting_2 == 0){
        ball(internal_diameter_2);
    }
    else if (fitting_2 == 1){
        socket(internal_diameter_2);
    }
    else if (fitting_2 == 2){
        tube_adapter(internal_diameter_2);
    }

    translate([(internal_diameter_1+internal_diameter_2+internal_diameter_3)/3+2*wall,0,0])
    rotate([0,-angle,0])
    translate([(internal_diameter_1+internal_diameter_2+internal_diameter_3)/6+wall,0,-size_3-(internal_diameter_1+internal_diameter_2+internal_diameter_3)/6])
    if (fitting_3 == 0){
        ball(internal_diameter_3);
    }
    else if (fitting_3 == 1){
        socket(internal_diameter_3);
    }
    else if (fitting_3 == 2){
        tube_adapter(internal_diameter_3);
    }
}

module cap(){
    difference(){
        union(){
            translate([0,0,2*internal_diameter_1+wall])
            sphere(d=2*internal_diameter_1-tolerance);

            translate([0,0,internal_diameter_1])
            cylinder(h=internal_diameter_1/2, d=internal_diameter_1+2*wall);

            sphere(d=2*internal_diameter_1+2*wall);

            cylinder(h=internal_diameter_1+wall, d1=2*internal_diameter_1+2*wall, d2=internal_diameter_1+2*wall);
        }
        union(){
            sphere(d=2*internal_diameter_1+tolerance);

            translate([0,0,-internal_diameter_1-wall-delta])
            cylinder(h=0.85*internal_diameter_1+wall+delta, d=2*internal_diameter_1+2*wall);
        }
    }
}

module base(){
    difference(){
        union(){
            rotate([0,180,0])
            if (fitting_1 == 0){
                ball(internal_diameter_1);
            }
            else if (fitting_1 == 1){
                socket(internal_diameter_1);
            }
            else if (fitting_1 == 2){
                tube_adapter(internal_diameter_1);
            }

            translate([0,0,-wall/2])
            cube([3*internal_diameter_1,3*internal_diameter_1,wall], center=true);
        }
        union(){
            translate([-internal_diameter_1,-internal_diameter_1,-wall-delta])
            cylinder(h=wall+2*delta, d1=3, d2=5);

            translate([-internal_diameter_1,internal_diameter_1,-wall-delta])
            cylinder(h=wall+2*delta, d1=3, d2=5);

            translate([internal_diameter_1,-internal_diameter_1,-wall-delta])
            cylinder(h=wall+2*delta, d1=3, d2=5);

            translate([internal_diameter_1,internal_diameter_1,-wall-delta])
            cylinder(h=wall+2*delta, d1=3, d2=5);
        }
    }
}

module gate(){
    difference(){
        union(){
            translate([0,0,1.5*wall+tolerance])
            rotate([0,180,0])
            if (fitting_1 == 0){
                ball(internal_diameter_1);
            }
            else if (fitting_1 == 1){
                socket(internal_diameter_1);
            }
            else if (fitting_1 == 2){
                tube_adapter(internal_diameter_1);
            }

            translate([0,0,-1.5*wall-tolerance])
            if (fitting_2 == 0){
                ball(internal_diameter_1);
            }
            else if (fitting_2 == 1){
                socket(internal_diameter_1);
            }
            else if (fitting_2 == 2){
                tube_adapter(internal_diameter_1);
            }

            cube([3*internal_diameter_1+2*tolerance,3*internal_diameter_1+2*tolerance,3*wall+2*tolerance], center=true);
        }
        union(){
            translate([0,0,-1.5*wall-tolerance-delta])
            cylinder(h=3*wall+2*tolerance+2*delta, d=internal_diameter_1);

            translate([wall/2,0,0])
            cube([3*internal_diameter_1-wall+2*tolerance+delta,3*internal_diameter_1-2*wall+2*tolerance,wall+2*tolerance], center=true);

            translate([1.5*internal_diameter_1,0,-1.5*wall-tolerance-delta])
            cylinder(h=3*wall+2*tolerance+2*delta, d=internal_diameter_1);
        }
    }
}

module slide(){
    translate([wall/2,0,0])
    cube([3*internal_diameter_1-wall,3*internal_diameter_1-2*wall,wall], center=true);

    translate([1.5*internal_diameter_1,0,-wall/2])
    cylinder(h=wall, d=internal_diameter_1);
}

module nozzle(){
    difference(){
        union(){
            linear_extrude(height=size_1+10, scale=[(internal_diameter_1*(size_2/10)+2*wall)/(internal_diameter_1+2*wall),(internal_diameter_1*(size_3/10)+2*wall)/(internal_diameter_1+2*wall)])
            circle(d=internal_diameter_1+2*wall);

            translate([0,0,size_1+10])
            linear_extrude(height=wall, scale=[(internal_diameter_1*(size_2/10))/(internal_diameter_1*(size_2/10)+2*wall),(internal_diameter_1*(size_3/10))/(internal_diameter_1*(size_3/10)+2*wall)])
            scale([(internal_diameter_1*(size_2/10)+2*wall)/(internal_diameter_1+2*wall),(internal_diameter_1*(size_3/10)+2*wall)/(internal_diameter_1+2*wall)])
            circle(d=internal_diameter_1+2*wall);
        }
        union(){
            translate([0,0,-delta])
            linear_extrude(height=size_1+10+2*delta, scale=[size_2/10,size_3/10])
            circle(d=internal_diameter_1);

            translate([0,0,size_1+10-delta])
            linear_extrude(height=wall+2*delta)
            scale([(internal_diameter_1*(size_2/10))/(internal_diameter_1+2*wall),(internal_diameter_1*(size_3/10))/(internal_diameter_1+2*wall)])
            circle(d=internal_diameter_1+2*wall);
        }
    }

    if (fitting_1 == 0){
        ball(internal_diameter_1);
    }
    else if (fitting_1 == 1){
        socket(internal_diameter_1);
    }
    else if (fitting_1 == 2){
        tube_adapter(internal_diameter_1);
    }
}

module valve_a(){
    difference(){
        union(){
            cylinder(h=internal_diameter_1+2*wall, d=internal_diameter_1+2*wall-tolerance);

            translate([0,0.5*wall,internal_diameter_1+2*wall])
            rotate([90,0,0])
            cylinder(h=wall, d=internal_diameter_1);
        }
        union(){
            translate([-0.5*internal_diameter_1-wall,0,0.5*internal_diameter_1+wall])
            rotate([0,90,0])
            cylinder(h=internal_diameter_1+2*wall, d=internal_diameter_1);
        }
    }
}

module valve_b(){
    difference(){
        union(){
            translate([0,0,-wall])
            cylinder(h=internal_diameter_1+3*wall, d=internal_diameter_1+4*wall);

            translate([-0.5*internal_diameter_1-3*wall,0, 0.5*internal_diameter_1+wall])
            rotate([0,90,0])
            cylinder(h=internal_diameter_1+6*wall, d=internal_diameter_1+2*wall);
        }
        union(){
            cylinder(h=internal_diameter_1+2*wall+delta, d=internal_diameter_1+2*wall+tolerance);

            translate([-0.5*internal_diameter_1-3*wall-delta,0, 0.5*internal_diameter_1+wall])
            rotate([0,90,0])
            cylinder(h=internal_diameter_1+6*wall+2*delta, d=internal_diameter_1);
        }
    }

    translate([-0.5*internal_diameter_1-3*wall,0, 0.5*internal_diameter_1+wall])
    rotate([0,90,0])
    if (fitting_1 == 0){
        ball(internal_diameter_1);
    }
    else if (fitting_1 == 1){
        socket(internal_diameter_1);
    }
    else if (fitting_1 == 2){
        tube_adapter(internal_diameter_1);
    }

    translate([0.5*internal_diameter_1+3*wall,0, 0.5*internal_diameter_1+wall])
    rotate([0,-90,0])
    if (fitting_2 == 0){
        ball(internal_diameter_1);
    }
    else if (fitting_2 == 1){
        socket(internal_diameter_1);
    }
    else if (fitting_2 == 2){
        tube_adapter(internal_diameter_1);
    }
}

module show_what(){
    if (select_part == "Basic")
        color("grey")
        basic();
    if (select_part == "2-way")
        color("grey")
        2_way();
    if (select_part == "3-way")
        color("grey")
        3_way();
    if (select_part == "Cap")
        color("grey")
        cap();
    if (select_part == "Base")
        color("grey")
        base();
    if (select_part == "Gate")
        color("grey")
        gate();
    if (select_part == "Slide (for gate)")
        color("grey")
        slide();
    if (select_part == "Nozzle")
        color("grey")
        nozzle();
    if (select_part == "Valve (part a)")
        color("grey")
        valve_a();
    if (select_part == "Valve (part b)")
        color("grey")
        valve_b();
}

difference(){
    union(){
        show_what();
    }

    if (cut_away == "Yes")
    translate([-150,-55,-150])
    cube([300,55,300]);
}
```


[User]
I'm looking to design a canopy holder for my RC plane, similar to the one in the provided SCAD file, but I need it to be fully parametric and more robust for different mounting scenarios. Basically, I need a bracket that will hold the canopy, and I need a way to customize the dimensions to fit various models.

Here's the breakdown of the features I need, referencing the original SCAD parameters but with added flexibility:

*   **Cylinder/Mounting Post:**
    *   `r_cyl`: Outer radius of the cylinder that holds the canopy (currently 6.0). Make this adjustable. I would like to specify an r_cyl_outer and an r_cyl_inner to allow for some flexibility and a thicker wall as necessary.
    *  `r_hole`: Radius of the hole through the cylinder (currently 3.6). Should be adjustable and separate from the outer radius.
    *   Add the ability to define a cylinder height separately from the thickness. This would let me change how tall the mounting post is.
    *   Add a chamfer angle and depth for both the top and bottom of the hole in the cylinder. Instead of fixed offsets, allow me to specify the angle and depth of the chamfer separately for both ends.
*   **Bar/Base:**
    *   `blen`: Length of the base bar (currently 25). Adjustable.
    *   `bheight`: Height/thickness of the base bar (currently 2.3). Adjustable.
    *   `bwid`: Width of the base bar (currently 12). Adjustable.

*   **Sawtooth/Grip:**
    *   `sawlen`: Length of the sawtooth section (currently 10). Adjustable.
    *   `sawdep`: Depth of the sawtooth (currently 1.3). Adjustable. I'd like to specify this as a distance rather than depth for simplicity.
    *   `sawwid`: Width of the sawtooth (currently 10). Adjustable.
    *   I also need to define the spacing between the sawtooth cuts/steps, that's currently hardcoded as `i= [0:2:sawlen]`. I'd like to use a variable called `saw_step` that defines that spacing.
    * Instead of using hulls for all the sawteeth, use a more efficient process. I also want to add the option to adjust the depth of each tooth from 0.
*   **Weight Reduction Slots (Optional):**
    *   `r_redhole`: Radius of the weight reduction holes (currently 1.5). Needs a setting for disabling them completely. I'd like the ability to define the position of these holes relative to the base.
    *  I want an option to specify the number of reduction holes.
    * I'd like to be able to change the shape to be rectangular or hexagonal if I want to try different options.

*  **Other features:**
    * Add a fillet option, with a settable radius, along the base edges of the support.
    * Add a variable to specify the number of mounting posts rather than just assuming one.
    * I want a variable to specify a base offset, that will control where the base starts on the x and y axis.

*   **General:**
    *   Everything should be fully parametric so I can easily change it.
    *   Make sure to use a functional style, not just a series of translate and rotate commands. Use modules and functions to organize the code well.

I’d like this to be as easy to use as possible, so if you could provide a single file (or if it's easier, two files - one for all of the parameters and one with the main design code) that’d be great. Don't worry about any included libraries for now, but let me know if you use any so I can add them later.

[Assistant]
canopy-holder_v2.scad:
```
// ********  Canopy Holder **********
// compatible to MPX Cularis / Easyglider
//     Henning Stöcklein 8.5.2016
//     free for non-commercial use
// ******************************

/* [User parameters] */
// Cylinder Outer Radius (MPX:4.5)
r_cyl = 6.0 ; // [5:0.1:7]

// Hole Radius (MPX:3.5)
r_hole = 3.6 ; // [3.3:0.1:4.5]

// Bar length (MPX:20)
blen = 25 ; // [18:0.2:25]

// Bar height (MPX:2.3)
bheight = 2.3 ; // [2:0.1:3]

// Bar width (MPX:10)
bwid = 12 ; // [10:0.2:15]

// Sawtooth length (MPX:8)
sawlen = 10 ; // [8:0.2:15]

// Sawtooth height (MPX:1.0]
sawdep = 1.3 ; // [1.0:0.1:2.0]

// Sawtooth width (MPX:10)
sawwid = 10 ; // [8.0:0.2:15]

// Weight reduction slot?
r_redhole = 1.5 ; // [0:None, 1:Very small, 1.5:Small, 2:Medium, 3:Big]

//******* End of user defined parameters *******

module canopy()
{
  difference ()
  {
    hull ()
    {
        translate ([0,0,0]) cube ([bwid,0.1,bheight]) ;
        translate ([0,blen-2*r_cyl,0]) cube ([bwid,0.1,bheight]) ;
        translate ([bwid/2,blen,0]) cylinder (r1=r_cyl-0.7 , r2=r_cyl, h=0.7, $fn=50) ;
        translate ([bwid/2,blen,bheight-0.4]) cylinder (r1=r_cyl, r2=r_cyl-0.5, h=0.5, $fn=50) ;
    }
    translate ([bwid/2,blen,-1]) cylinder (r=r_hole, h=4, $fn=50) ;

    // Fasen am Loch
    translate ([bwid/2,blen,bheight-0.3]) cylinder (r1=r_hole, r2=r_hole+1, h=1, $fn=50) ;
    translate ([bwid/2,blen,-0.4]) cylinder (r2=r_hole, r1=r_hole+1, h=1, $fn=50) ;

    // Create array of sawtooth steps
    for (i= [0:2:sawlen])
      translate ([-0.1,-0.1,sawdep-1.0]) hull()
      {
        translate ([(bwid-sawwid)/2,i,1.0]) cube ([sawwid,0.1,0.1]) ;
        translate ([(bwid-sawwid)/2,i,bheight]) cube ([sawwid,bheight,0.1]) ;
      }

    // 1st sawtooth always cuts the complete width
    translate ([-0.1,-0.1,sawdep-1.0]) hull()
    {
      translate ([-0.1,0,1.0]) cube ([20,0.1,0.1]) ;
      translate ([-0.1,0,bheight]) cube ([20,bheight,0.1]) ;
    }

    // Weight reduction hole in sawtooth area
    hull()
    {
        translate ([bwid/2,bwid/3+r_redhole,0]) cylinder (r=r_redhole, h=10, center=true, $fn=20) ;
        translate ([bwid/2,blen-2*r_cyl-r_hole,0]) cylinder (r=r_redhole, h=10, center=true, $fn=20) ;
    } // hull
  } // diff
} // module

canopy () ;

```