[User]
I need a parametric OpenSCAD design for a loose tenon jig, similar to the one in the video I linked. It's for use with a router and a guide bushing to create mortises for floating tenons, like Festool dominos.

Here's how it should work and the parameters I need:

**Basic Setup:**

*   It has a base plate that sits on the wood, and a registration plate that sits against the edge of the wood.
*   The router with a guide bushing runs along the base plate, creating the mortise.
*   I need to be able to adjust the tenon size (width), the material width, and the bushing size, obviously.

**Parameters:**

*   `bushingsize`: This is the diameter of the guide bushing I'm using in my router.
*   `size`: This is a multiplier that adjusts the domino mortise width. A value of 1 would create a mortise sized for a standard domino, and values above 1 make the mortise wider.
*   `materialwidth`:  The width of the material I'll be using the jig with.
*   `regplatethickness`:  The thickness of the registration plate.
*   `regplateheight`: The height of the registration plate.
*   `baseplatethickness`: The thickness of the base plate.
*   `baseplatewidth`: The width of the base plate.
*   `baseplateheight`: The height of the base plate, but if set to 0, it should be calculated automatically based on the `materialwidth` and `regplatethickness` – basically it needs to be tall enough to accommodate both plus some extra, if possible.
*   `alignmentpindistance`: The distance of alignment pins from the center.
*   `alignmentpindiameter`: The diameter of the alignment pin holes.
*   `alignmentpincount`: The number of alignment pins. This can be 0 for no alignment pins, or more, up to 10.
*   `recessdiameter`: The diameter of a recess for the bookshelf pins.
*   `recess`: The depth of that pin recess

**Other Design Considerations:**

*   The jig needs to have cutouts along the base plate to guide the router based on the `bushingsize` and the calculated domino width.
*   Include a small logo, maybe like a linear extrusion of some text. It doesn't have to be fancy, but it should scale based on the smaller of either `baseplatewidth` or `regplateheight`.
*   Add some alignment lines, one for the center and another for the registration plate location to help with positioning.

The file in my example uses simple cube, cylinder and difference operations, along with linear extrude, hull, and translate.

Could you generate an OpenSCAD file or files to do this? I think it could be done in a single file if you use functions and modules, but if you think it would be more maintainable as multiple files, that would be fine too.

[Assistant]
loose-tennon-jig.scad:
```
/* [Simple settings] */

// Size of the guide bushing you are using in the router
bushingsize = 17.15;
// Values above 1 make the domino slot larger
size = 1;
// Width of the material you want to use
materialwidth = 18;

/* [Registration plate] */

// Thickness of the registration plate
regplatethickness = 8;
// Height of the registration plate
regplateheight = 40;

/* [Base plate] */

// Strength of the base plate
baseplatethickness = 8;
// Width of the baseplate
baseplatewidth = 120;
// Height of the baseplate (set to 0 for automatic calculation)
baseplateheight = 90;

/* [Alignment helpers] */

// Distance of the alignmentpin from the center
alignmentpindistance = 25;
// Diameter of the alignmentpin hole
alignmentpindiameter = 5.6;
// Number of alignmentpins
alignmentpincount = 2; // [0:1:10]
// Diameter of recess for bookshelf pins
recessdiameter=7.5;
// Depth of the pin recess
recess=1.5;

dominowidth = 13 * size;

difference() {

  difference() {

    translate([0,0,baseplatethickness/2]) union() {

      // Baseplate
      difference() {
        cube([baseplatewidth,baseplateheightcalc(),baseplatethickness], center=true);
        hull() {
            translate([-dominowidth/2,0,0]) cylinder(h=2*baseplatethickness, d=bushingsize, center=true);
            translate([dominowidth/2,0,0]) cylinder(h=2*baseplatethickness, d=bushingsize, center=true);
        }
      }

      // Registration plate
      translate([0,0.5*regplatethickness+0.5*materialwidth,regplateheight/2])
        cube([baseplatewidth,regplatethickness,regplateheight], center=true);

    }

    // Logo
    translate([0,0.5*materialwidth,0.5*regplateheight+baseplatethickness]) rotate([90,180,0]) union() {
       scale([logosize(),logosize(),3]) translate([0,0,-0.5])  wow_logo();
      }

    // Center alignment line
    rotate([90,0,0])
      translate([-0.1*baseplatethickness,0,0])
         linear_extrude(baseplateheightcalc()+2, center=true)
           polygon(points=[[0,0], [0.5,0.2*baseplatethickness], [1,0]]);

    // Registration plate alignment line
    hull() {
      translate([0,0.5*regplatethickness+0.5*materialwidth,sqrt(3*3+3*3)/2+baseplatethickness])
        rotate([45,0,90])
          cube([1.1*regplatethickness,3,3],center=true);

        translate([0,0.5*materialwidth+regplatethickness,sqrt(6*6+6*6)/2+baseplatethickness])
          rotate([45,0,90])
            cube([1,6,6],center=true);
    }

  }

  // Alignment holes
  if (alignmentpincount > 0) {
    for (i=[1:alignmentpincount]) {
      union() {
        translate([-i*alignmentpindistance+0.5*alignmentpindiameter,0,baseplatethickness/2])
         cylinder(r=alignmentpindiameter/2, h=2*baseplatethickness, center=true);
        translate([i*alignmentpindistance-0.5*alignmentpindiameter,0,baseplatethickness/2])
         cylinder(r=alignmentpindiameter/2, h=2*baseplatethickness, center=true);

       translate([-i*alignmentpindistance+0.5*alignmentpindiameter,0,baseplatethickness-recess/2])
        cylinder(r=recessdiameter/2, h=recess, center=true);
      translate([i*alignmentpindistance-0.5*alignmentpindiameter,0,baseplatethickness-recess/2])
       cylinder(r=recessdiameter/2, h=recess, center=true);

       }
     }
   }
 }

function baseplateheightcalc() = (baseplateheight==0) ? materialwidth + (2*regplatethickness) : baseplateheight ;

function logosize() = (baseplatewidth < regplateheight) ? 0.6*baseplatewidth : 0.6*regplateheight ;

module wow_logo()
{
 /* Generated by trace2scad version 20150415
    http://aggregate.org/MAKE/TRACE2SCAD/
    Optimized model has 607/4417 original points
 */
 minx=0; /* polygon minx=0 */
 miny=0; /* polygon miny=3 */
 maxx=18220; /* polygon maxx=18220 */
 maxy=20000; /* polygon maxy=20000 */
 dx=maxx-minx;
 dy=maxy-miny;
 maxd=((dx>dy)?dx:dy);
 scale([1/maxd, 1/maxd, 1])
 translate([-minx-dx/2, -miny-dy/2, 0])
 linear_extrude(height=1, convexity=607)
 union() {
  union() {
   union() {
    difference() {
     polygon([[14210,19995],[14210,19990],[14075,19974],[14064,19960],[14028,19443],[13970,18717],[13934,18123],[13929,17563],[13975,16413],[14027,15858],[14075,15523],[14158,15158],[14183,15140],[14533,15122],[14618,15113],[15248,15113],[15603,15164],[15818,15221],[15848,15233],[15860,15258],[15932,15778],[15975,16168],[16003,16633],[16020,17074],[16026,17933],[15995,18638],[15968,18904],[15899,19348],[15832,19630],[15739,19908],[15721,19947],[15712,19955],[15405,19962],[14933,19986],[14910,20000],[14210,20000]], convexity=7);
     polygon([[15077,18800],[15084,18795],[15135,18458],[15182,18028],[15200,17843],[15221,17398],[15216,16768],[15203,16534],[15187,16514],[14825,16460],[14800,16471],[14725,16995],[14700,17233],[14685,17388],[14676,17708],[14682,18711],[14701,18735],[14750,18760],[14908,18793],[15049,18808],[15070,18806]], convexity=7);
    }
   }
   polygon([[16790,19970],[16708,19966],[16333,19935],[16320,19918],[16335,18918],[16390,16913],[16410,16268],[16420,15161],[16543,15140],[16978,15128],[17200,15134],[17303,15149],[17346,15164],[17354,15170],[17359,15413],[17340,16138],[17329,16798],[17362,17213],[17380,17344],[17941,17356],[17958,17369],[18010,17648],[18035,17940],[18059,18343],[18045,18358],[17883,18370],[17315,18376],[17302,18389],[17295,18769],[17310,18985],[17336,19074],[17358,19080],[17658,19075],[18065,19052],[18161,19041],[18179,19059],[18195,19181],[18210,19290],[18220,19290],[18220,19928],[17950,19953],[17743,19971],[16873,19974]], convexity=12);
   polygon([[900,19930],[768,19926],[278,19879],[0,19840],[0,19776],[14,19765],[31,19650],[157,18873],[270,18044],[363,17265],[430,16650],[582,15220],[775,13498],[1028,11239],[1053,11221],[1143,11210],[1480,11218],[1618,11227],[1983,11227],[2104,11210],[2119,11224],[2190,11745],[2257,12311],[2372,13408],[2430,13936],[2495,14441],[2500,14460],[2519,14470],[2567,14003],[2612,13620],[2682,13110],[2972,11224],[2984,11211],[3179,11207],[3555,11243],[3883,11280],[4113,11290],[4129,11309],[4245,12553],[4532,15720],[4645,16868],[4758,17920],[4873,18870],[4940,19380],[4995,19769],[4989,19796],[4983,19805],[4828,19835],[4563,19855],[3920,19860],[3785,19872],[3749,19876],[3720,19728],[3697,19545],[3631,18753],[3572,17883],[3503,17080],[3434,16523],[3415,16389],[3392,16356],[3386,16354],[3307,16760],[3285,16903],[3217,17448],[3170,17896],[3045,19170],[3000,19530],[2954,19791],[2935,19813],[2493,19841],[2298,19836],[2176,19809],[2150,19782],[2120,19535],[2075,19073],[2030,18518],[1973,17778],[1927,17213],[1903,16955],[1885,16820],[1881,16814],[1847,17060],[1767,17843],[1677,18654],[1584,19395],[1506,19917],[1490,19932],[1033,19934]], convexity=14);
   polygon([[9653,19895],[9578,19891],[9158,19880],[8863,19852],[8859,19821],[9006,19443],[9211,18828],[9405,18148],[9585,17423],[9815,16373],[9953,15690],[9999,15462],[10033,13923],[10062,12265],[10043,11243],[10064,11218],[10288,11186],[10653,11179],[11193,11198],[11800,11212],[11815,11228],[11855,14883],[11869,15283],[12122,16263],[12930,19398],[13037,19850],[13023,19864],[12898,19880],[12368,19899],[11703,19880],[11625,19710],[11497,19278],[11390,18798],[11198,17863],[11108,17513],[11081,17462],[10977,17795],[10901,18133],[10843,18447],[10775,18880],[10693,19420],[10612,19875],[10598,19889],[10258,19900],[9728,19899]], convexity=11);
   union() {
    difference() {
     polygon([[8053,19870],[8033,19866],[7546,19820],[7013,19793],[5986,19794],[5968,19733],[5842,18843],[5750,18118],[5613,16898],[5455,15301],[5352,14175],[5193,12445],[5065,11172],[5083,11156],[5178,11144],[5603,11136],[6390,11150],[6579,11155],[6599,11173],[6640,11487],[6767,12760],[6790,12950],[6880,13581],[6902,13714],[7312,13723],[7343,13713],[7395,13237],[7440,12683],[7498,11798],[7536,11220],[7549,11209],[7797,11185],[8213,11160],[8633,11154],[9063,11170],[9321,11200],[9372,11215],[9377,11220],[9290,11745],[9153,12633],[9040,13390],[8788,15210],[8662,16145],[8410,17985],[8227,19213],[8119,19875],[8073,19874]], convexity=11);
     polygon([[7219,17983],[7230,17928],[7294,17377],[7511,15737],[7493,15721],[7048,15682],[6904,15671],[6879,15687],[7018,16886],[7106,17513],[7201,18053],[7209,18038]], convexity=7);
    }
   }
   polygon([[17953,14643],[17908,14638],[14628,14631],[14355,14610],[13626,14555],[13614,14528],[13605,13628],[13620,13533],[13631,12723],[13643,12710],[13935,12695],[15223,12669],[16685,12680],[17360,12700],[17790,12730],[18031,12766],[18050,12787],[18075,13211],[18097,14322],[18090,14636],[18079,14650],[17998,14648]], convexity=7);
   union() {
    difference() {
     polygon([[7828,8830],[7723,8826],[7530,8810],[6978,8760],[6525,8708],[6513,8703],[6425,8443],[6299,7953],[6232,7613],[6162,7125],[6115,6598],[6092,6158],[6074,5546],[6084,3793],[6107,3145],[6145,2538],[6218,1908],[6263,1607],[6371,1058],[6457,703],[6607,184],[6631,155],[7138,91],[7398,68],[8103,68],[8518,116],[8933,206],[9153,278],[9220,934],[9267,1515],[9330,2478],[9358,3173],[9383,4028],[9402,4698],[9403,6183],[9368,6740],[9325,7191],[9300,7373],[9260,7641],[9165,8080],[9056,8463],[8938,8776],[8873,8796],[8541,8830],[7933,8833]], convexity=6);
     polygon([[7987,6799],[7994,6788],[8035,6410],[8075,5868],[8100,5203],[8130,2808],[8152,2390],[8114,2363],[7999,2320],[7914,2303],[7514,2293],[7495,2328],[7417,2975],[7372,3455],[7325,4128],[7280,5095],[7260,5748],[7235,6722],[7257,6745],[7430,6775],[7808,6791],[7980,6810]], convexity=6);
    }
   }
   union() {
    difference() {
     polygon([[11625,8830],[11528,8826],[11173,8798],[10725,8753],[10345,8715],[10331,8715],[10302,8691],[10160,8208],[10090,7913],[10020,7540],[9975,7226],[9953,7035],[9930,6797],[9905,6438],[9884,5935],[9878,4888],[9884,3790],[9895,3418],[9918,2955],[9956,2423],[10032,1805],[10134,1228],[10254,708],[10414,169],[10423,160],[10890,95],[11203,68],[11898,68],[12338,120],[12673,191],[12918,266],[12954,281],[13030,1028],[13102,2045],[13125,2448],[13150,2995],[13190,4218],[13208,5603],[13185,6483],[13160,6833],[13137,7075],[13115,7270],[13070,7573],[12975,8043],[12865,8433],[12736,8775],[12718,8789],[12388,8830],[11723,8834]], convexity=8);
     polygon([[11794,6796],[11799,6788],[11813,6634],[11848,6253],[11875,5778],[11890,5493],[11910,4528],[11925,3060],[11948,2398],[11945,2380],[11848,2334],[11730,2304],[11313,2290],[11300,2306],[11253,2663],[11185,3308],[11140,3878],[11115,4305],[11075,5128],[11045,6443],[11043,6731],[11068,6751],[11233,6775],[11608,6791],[11790,6805]], convexity=6);
    }
   }
   polygon([[1633,8785],[1553,8781],[1068,8732],[838,8699],[814,8688],[957,7800],[1003,7495],[1117,6608],[1185,6020],[1323,4730],[1447,3593],[1493,3188],[1837,122],[1844,93],[1864,76],[2076,70],[2625,85],[2773,85],[2915,70],[2929,93],[3010,673],[3080,1270],[3230,2696],[3273,3058],[3316,3352],[3321,3362],[3332,3302],[3355,3082],[3400,2668],[3480,2058],[3642,1010],[3789,73],[3803,64],[4150,75],[4563,123],[4831,144],[4920,146],[4936,164],[4975,546],[5135,2290],[5270,3797],[5443,5605],[5580,6879],[5648,7443],[5693,7801],[5806,8641],[5784,8665],[5663,8690],[5298,8716],[4963,8710],[4620,8725],[4573,8735],[4549,8717],[4500,8338],[4450,7700],[4370,6570],[4302,5833],[4231,5298],[4215,5200],[4211,5194],[4180,5283],[4107,5685],[4041,6183],[3993,6638],[3925,7335],[3825,8301],[3769,8623],[3758,8668],[3403,8696],[3088,8691],[2983,8666],[2966,8643],[2942,8493],[2875,7803],[2760,6334],[2705,5724],[2681,5700],[2588,6615],[2520,7232],[2452,7803],[2383,8343],[2320,8779],[2289,8790],[1713,8788]], convexity=17);
   union() {
    difference() {
     polygon([[14457,8720],[14322,8716],[14025,8683],[13759,8634],[13740,8615],[13810,7398],[13880,6018],[13925,4925],[13965,3688],[13981,2013],[13965,625],[13949,190],[13964,167],[14200,101],[14528,42],[14823,9],[14843,3],[15388,3],[15688,55],[15873,116],[15999,188],[16182,343],[16328,483],[16533,718],[16926,1222],[17175,1513],[17235,1594],[17324,1748],[17374,1868],[17396,1970],[17402,2015],[17383,2490],[17355,3138],[17329,4658],[17315,6600],[17300,7571],[17275,7656],[17212,7773],[17066,7958],[16849,8158],[16558,8380],[16208,8599],[16028,8692],[15488,8699],[15252,8715],[14593,8723]], convexity=8);
     polygon([[15785,6295],[15794,6290],[15867,5806],[15930,5303],[15975,4756],[16001,4197],[15991,3430],[15968,3065],[15923,2638],[15849,2213],[15835,2190],[15780,2198],[15374,2286],[15366,2309],[15328,3430],[15283,4398],[15213,5564],[15169,6210],[15206,6238],[15283,6270],[15433,6299],[15776,6300]], convexity=6);
    }
   }
  }
 }
}

```


[User]
I'm looking to create a customizable tenting mount for split keyboards, specifically something that will work well with a Let's Split case or similar. I have some specific dimensions I need to be able to control, and I'd like it to be parametric so I can adjust it easily. I've been using OpenSCAD, and it seems like a good tool for this.

Ideally, I need to be able to set:

*   **Height:** The height of the surface where the keyboard half will sit.
*   **Width:** The width of that same surface.
*   **Angle:** The angle of inclination for the tenting.
*   **Rounding:** A radius for rounding the edges (Minkowski sum).
*   **Support Board Thickness:** The thickness of the bottom support piece.
*   **Hole Size:** A factor controlling the size of the holes through the tent.
*   **Facet Number:** Facets for cylinders and spheres (to control smoothness).

The design will essentially be a prism that is angled, with a support piece that the keyboard sits on, and it should have holes through it for lightness and aesthetics. It would be very useful to generate two instances for use with different keyboard halves.

It should also include Minkowski rounding on the overall shape; however, it should be adjustable and could be set to 0 if needed for speed. And, I need the actual support piece to angle the same amount as the rest of the tent. I'd also like a small support at the bottom of the tent that is a separate piece. I think this might require a custom Minkowski object for the rounded corners, to match the tilted angle.

The script should be efficient, since customizer can be a pain with complex models. Could you generate the OpenSCAD files for this? I don't need any external libraries. I would like the output to be in a single file or several files that can work together if that is necessary.

[Assistant]
lets_split_tenting.scad:
```
//height of the surface the keyboard half will rest on
height = 88;

// width of the surface the keyboard will rest on
width = 121;

//angle of inclination
angle = 15; // [0:90]

// minkowski radius. increase to increase rounding
mink_r = 0;

// side length of cube at the bottom of the tent to hold in the keyboards
support_board_thickness = 5;

// how big the holes are. higher numbers = smaller holes. 2 = 1/2 the size of the sides
hole_size_factor = 2;

// facet number for cylinders and spheres. decrease to decrease rounded edges and compilation time
$fn=24;

// length is now x, width is y, height is still z
module prism(l, w, h){
  polyhedron(
    points=[[0,0,0], [0,w,0], [l,w,0], [l,0,0], [l,0,h], [l,w,h]],
    faces=[[0,1,2,3],[5,4,3,2],[0,4,5,1],[0,3,4],[5,2,1]]
  );
}

//calculated variables

// height is the only thing that needs adjustment, since the supoport bar
// at the bottom of the print actually extends, counteracting the extension
// of the length at the other side. that does make the support bar longer
// than advertised, but eh

real_height = height - mink_r * 2;

module tent(angle){
  hypotenuse = width + support_board_thickness;
  opposite = sin(angle) * hypotenuse;
  adjacent = cos(angle) * hypotenuse;

  minkowski(){
    difference(){
      union(){
        prism(adjacent, real_height, opposite);
        rotate([0, -angle, 0]) cube([support_board_thickness, real_height, support_board_thickness]);
      }
      holes(adjacent, real_height);
      // bottom board. if you want more height in your design you can enable this
      /* translate([0, 0, -10]) cube([adjacent, real_height, 10]); */
    }
    minkowski_shape(angle);
  }
}

// special cylinder with a tilted top that exactly matches the angle of the support
module minkowski_shape(angle=15){
  hull() {
    cylinder(r=mink_r, h=.001);
    rotate([0, -angle, 0]) translate([0, 0, mink_r]) cylinder(r= mink_r, h=.001);
  }
}

module holes(length, real_height){
  $fn=24;
  translate ([length / 2, 0, 0]) cylinder(d=length / hole_size_factor, h=100);
  translate([0, real_height / 2, 0]) cylinder(d=length / hole_size_factor, h=100);
  translate([length / 2, real_height, 0]) cylinder(d=length / hole_size_factor, h=100);
  translate([length, real_height / 2, 0]) cylinder(d=length / hole_size_factor, h=100);
}

/* minkowski_shape(); */
tent(angle);

```


[User]
I need a parametric OpenSCAD design for a parts tray, something like the one I've been playing around with but I want it done properly. The idea is that it will have a grid of rectangular compartments for holding small parts like nuts and bolts.

Here's a breakdown of what I need:

*   **Compartments:** The design should feature multiple compartments arranged in a grid.
*   **Adjustable Size:** I'd like to be able to adjust the height, width, and depth of the compartments via parameters, as well as the thickness of the walls.
*   **Filleted Corners:** The inner and outer corners of the compartments should be filleted (rounded) for a cleaner look and to make it easier to get small parts out. I need to be able to adjust the fillet radius.
*   **Grid Size:** I need to control the number of rows and columns of compartments.
*   **Units:** Please use millimeters as the default unit.

I don't need anything fancy; it just needs to be functional and customizable. I'm not particular about which libraries are used, but I'm aware of MCAD, BOSL, BOSL2, dotSCAD, NopSCADlib, and BOLTS, so anything in that set is okay. If there's a particular library that would make something easier, please go with that.

The following settings are a reasonable starting point but I would like all of these to be modifiable:
*   **boxHeight = 20**
*   **boxWidthX = 50**
*   **boxWidthY = 40**
*   **wallThickness = 3**
*  **boxFillet = 1**
*   **rows = 3**
*   **columns = 2**

I'm looking forward to seeing what you come up with!

[Assistant]
Bolt_Tray.scad:
```

//Height of tray along Z axis (all units are in MM)
boxHeight = 20;
//X width of each compartment
boxWidthX = 50;
//Y width of each compartment
boxWidthY = 40;
//Thickness of walls
wallThickness = 3;
//Size of interior/exterior fillets. I recommend you make this less than or equal to 1/2 of wall thickness.
boxFillet = 1;
//How many rows of compartments do you want?
rows = 3;
//How many columns of compartments do you want?
columns = 2;

module compartmentExterior () {
    hull() {
        hull() {
            translate([boxWidthX - boxFillet, boxFillet, 0]) cylinder(boxHeight, r = boxFillet);
            translate([boxFillet, boxFillet, 0]) cylinder(boxHeight, r = boxFillet);
        }
        hull() {
            translate([boxWidthX - boxFillet, boxWidthY - boxFillet, 0]) cylinder(boxHeight, r = boxFillet);
            translate([boxFillet, boxWidthY - boxFillet,0]) cylinder(boxHeight, r = boxFillet);
        }
    }
}

module compartmentOpening () {
    hull() {
        hull() {
            translate([boxWidthX - boxFillet - wallThickness, boxFillet + wallThickness, 0 + wallThickness]) cylinder(boxHeight, r = boxFillet);
            translate([boxFillet + wallThickness, boxFillet + wallThickness, wallThickness]) cylinder(boxHeight, r = boxFillet);
        }
        hull() {
            translate([boxWidthX - boxFillet - wallThickness, boxWidthY - boxFillet - wallThickness, wallThickness]) cylinder(boxHeight, r = boxFillet);
            translate([boxFillet + wallThickness, boxWidthY - boxFillet - wallThickness, wallThickness]) cylinder(boxHeight, r = boxFillet);
        }
    }
}

module compartment () {
    difference () {
        compartmentExterior();
        compartmentOpening();
    }
}

union() {
    for (y = [1:rows]) {
        translate([0, (boxWidthY*(y-1))-(wallThickness*(y-1)), 0])
        for (x = [1:columns]) {
            translate([(boxWidthX*(x-1))-(wallThickness*(x-1)), 0, 0]) compartment();
        }
    }
}

```


[User]
I'd like a parametric OpenSCAD design for a 2D origami hedgehog, similar to the one on Thingiverse by mightynozzle, but I need it to be fully customizable with several parameters.

Here's what I'm looking for:

*   **Overall Size:**  I need to be able to specify the maximum size of the longest side of the hedgehog, and the shorter side should scale proportionally. I'll provide this in millimeters.
*   **Height:** The height/thickness of the model should be a parameter, also in millimeters. This will be for creating a 3D printable version.
*   **Outline Thickness:** I want to control the thickness of the outer line of the hedgehog.
*   **Inner Outline Thickness:** I also need to control the thickness of the inner lines/cuts of the design.
*   **Inner Outline End Roundness:** The ends of the inner lines should have a radius that I can adjust to make them more or less rounded.
*   **Flipping:** It should be possible to flip the entire model horizontally with a boolean parameter (yes/no).
*  **Libraries:** I don't want you to include external libraries, please make this as simple as possible.

The design consists of an outer outline defined by points, and several inner shapes that form the origami folds/cuts and are defined as polygons. I'll need you to use these to create the outer shape, then remove the inner areas.

Could you generate the OpenSCAD code for this?  Thanks!

[Assistant]
customizable_origami_hedgehog.scad:
```
/*
 * Customizable Origami - Hedgehog - https://www.thingiverse.com/thing:2748830
 * by Dennis Hofmann - https://www.thingiverse.com/mightynozzle/about
 * created 2018-01-07
 * version v1.0
 *
 * Changelog
 * --------------
 * v1.0:
 *      - final design
 * --------------
 *
 * This work is licensed under the Creative Commons - Attribution - NonCommercial - ShareAlike license.
 * https://creativecommons.org/licenses/by-nc-sa/3.0/
 */

 // Parameter Section //
//-------------------//

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

// The maximum size of the longest side. The shorter side will be automatically resized in same ratio.
max_size_in_millimeter = 120; //[20:300]

// The height of the model.
model_height_in_millimeter = 5; //[0.2:0.2:100]

// Thickness of the outer outline.
outline_size_in_millimeter = 1.9; //[0.5:0.1:20]

// Thickness of the inner outline.
inline_size_in_millimeter = 0.8; //[0.5:0.1:20]

// Roundiness of the ends of the inner outlines.
inline_edge_radius_in_millimeter = 0.6; //[0.0:0.1:5]

// Flip model
flip_model = "no"; //[yes,no]

/*[hidden]*/
max_size = max_size_in_millimeter;
model_height = model_height_in_millimeter;
$fn=32;

// Outer Points
A1 = [285, 1093];
A2 = [342, 983];
A3 = [214, 712];
A4 = [460, 770];
A5 = [482, 738];
A6 = [381, 421];
A7 = [606, 525];
A8 = [702, 502];
A9 = [665, 225];
A10 = [963, 437];
A11 = [1032, 485];
A12 = [1134, 232];
A13 = [1343, 485];
A14 = [1386, 412];
A15 = [1525, 637];
A16 = [1417, 826];
A17 = [1441, 861];
A18 = [1435, 892];
A19 = [1722, 1344];
A20 = [1797, 1322];
A21 = [1828, 1342];
A22 = [1776, 1433];
A23 = [1227, 1446];
A24 = [1229, 1467];
A25 = [1211, 1472];
A26 = [1195, 1639];
A27 = [1077, 1472];
A28 = [749, 1484];
A29 = [774, 1639];
A30 = [374, 1343];

outline = [A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30];

// Inner Points
B1 = [668, 988];
B2 = [927, 924];
B3 = [1192, 870];
B4 = [1249, 641];

// Polygons
C1 = [A3, A2, A4];
C2 = [A6, A7, A5];
C3 = [A9, A10, A8];
C4 = [A12, A13, B4, A11];
C5 = [A14, A15, B4, A13];
C6 = [A15, A16, B3, B4];
C7 = [A10, A11, B4, B3, B2];
C8 = [A7, A8, A10, B2, B1];
C9 = [A7, B1, A28, A29, A30, A1, A2, A4, A5];
C10 = [B1, B2, B3, A16, A28];
C11 = [A16, A17, A18, A23, A24, A25, A27, A28];
C12 = [A18, A19, A22, A23];
C13 = [A19, A20, A21, A22];
C14 = [A27, A26, A25];

cut_polygons = [C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14];

min_x = A3[0];
min_y = A9[1];
max_x = A21[0];
max_y = A26[1];

x_size = max_x - min_x;
y_size = max_y - min_y;

x_factor = max_size / x_size;
y_factor = max_size / y_size;

inline_size = x_size > y_size ? inline_size_in_millimeter / x_factor / 2: inline_size_in_millimeter / y_factor / 2;
inline_edge_radius = x_size > y_size ? inline_edge_radius_in_millimeter / x_factor: inline_edge_radius_in_millimeter / y_factor;
outline_size = x_size > y_size ? outline_size_in_millimeter / x_factor - inline_size: outline_size_in_millimeter / y_factor - inline_size;

 // Program Section //
//-----------------//

if(x_size > y_size) {
    resize(newsize=[max_size, x_factor * y_size, model_height]){
        if(flip_model == "yes") {
            mirror([0,1,0]) {
                rotate([180,180,0]) {
                    create(outline, cut_polygons);
                }
            }
        } else {
            create(outline, cut_polygons);
        }
    }
} else {
    resize(newsize=[y_factor * x_size, max_size, model_height]){
        if(flip_model == "yes") {
            mirror([0,1,0]) {
                rotate([180,180,0]) {
                    create(outline, cut_polygons);
                }
            }
        } else {
            create(outline, cut_polygons);
        }
    }
}

 // Module Section //
//----------------//

module create() {
    linear_extrude(height=1) {
        difference() {
            offset(r = -0) {
                offset(r = +outline_size) {
                    polygon(points = outline, convexity = 10);
                }
            }

            for(cut_polygon = [0:len(cut_polygons)]) {
                offset(r = +inline_edge_radius) {
                    offset(r = -inline_size - inline_edge_radius) {
                        polygon(points = cut_polygons[cut_polygon], convexity = 10);
                    }
                }
            }
        }
    }
}

```


[User]
Hey, I'm looking to get some help designing a parametric OpenSCAD file for floss cards. I found one online but it's a bit clunky and I'd rather have one built from scratch that's more tailored to my needs.

The basic idea is a rectangular card with rounded ends and the ability to add a center hole (circle or heart shaped) or no center hole. It needs to have slots for holding floss (from 0 to 5) around the edges and ideally I'd like to be able to add text to the top or bottom.

Here's a breakdown of the desired parameters, which are similar to what the one I found uses:

*   **`width`**: The overall width of the card. (e.g. 38mm)
*   **`height`**: The overall height of the card. (e.g. 41mm)
*   **`thickness`**: The thickness of the card. (e.g. 1mm)
*  **`diameter`**: The diameter of the rounded ends, and size of the center hole. (e.g. 8mm)
*   **`Hole`**: An option with the strings: "None", "Circle", "Heart", to select the center hole shape.
*   **`top_text`**:  A string for text at the top.
*   **`bottom_text`**: A string for text at the bottom.
*   **`font_size`**: Size of the text. (e.g. 4.0mm)
*   **`Font`**: A string for the font selection from a set of available dxf fonts.
*   **`slots`**: Integer between 0 and 5, the number of thread slots to add.
*  **`slot_width`**: Width of the thread slots. (e.g. 0.80mm)
*   **`text_emboss_height`**: The height to extrude the text. (e.g. 0.3mm)

I'd like it to use the MCAD library (specifically the 2Dshapes module) and also a `write` module similar to the one used in the example code. I would assume that `slots.scad` and `heart.scad` are custom files, and could be created from scratch. The fonts can be handled with a generic "write" module for the selected dxf files.

Could you generate the OpenSCAD files for this, please? Thanks!

[Assistant]
FlossCard_1.0.scad:
```
/*
LICENSE
-------
Licensed under Creative Commons International 4.0 Attribution License CC BY 4.0 <https://creativecommons.org/licenses/by/4.0/deed.ast>
Copyright 2018 Green Ellipsis LLC. www.greenellipsis.org

Written by ALittleSlow

MCAD libraries (refer to https://github.com/openscad/MCAD):
This library was created by various authors as named in the individual files' comments. All the files except those ThingDoc are licensed under the LGPL 2.1 (see http://creativecommons.org/licenses/LGPL/2.1/ or the included file lgpl-2.1.txt), some of them allow distribution under more permissive terms (as described in the files' comments).

This "Designer/Customizer/Thing" is for creating your own cards for storing floss. The default settings should work well for DMC six-strand floss and fit in most floss card storage cases.

Features include:
* Center hole can be circle, heart or none
* Zero to five thread slots
* Custom text at the top or bottom
* Customize the size and thickness

Want a feature added? Let me know.

To design your own thing
-------------------------------
1. Download and extract the .zip file.
2. Install the Development version of OpenSCAD (http://www.openscad.org/downloads.html#snapshots)
3. Enable the Customizer according to https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/WIP#Customizer
4. Open the .scad file
5. Pick your preset or set your customizations
6. Render
7. Export as an STL file

Get more Customizer help from DrLex: https://www.thingiverse.com/thing:2812634.

Usage Notes

Release Notes
=============
Version 1.0
-----------
* Cleanup for publishing
* Add Customizer preset
*/
use <GreenEllipsis/slots.scad>
use <Write/write.scad>
use <GreenEllipsis/heart.scad>
use <MCAD/2Dshapes.scad>

//Standard:38
width = 38; // [10:200]
//Standard:41
height = 41; // [10:200]
//PLA:1.0
thickness = 1; //[0.4:0.1:5]
//Standard:8
diameter = 8; //[0:100]
/* [Features] */
Hole = "Circle"; // [None,Circle,Heart]
top_text = "";
bottom_text = "";
font_size = 4.0; //[1.0:0.1:20.0]
// font of card text
Font = "Letters"; // [BlackRose,braille,knewave,Letters,orbitron]

slots = 2; // [0:5]
//DMC floss on a MP Select Mini V2 using PLA:0.80
slot_width = 0.80; // [0:0.01:3]

/* [Hidden] */
text_emboss_height = 0.3;
$fn = 24; // [12:64]

font = str(Font, ".dxf");

// top and bottom slot shapes
module end(diameter, width) {
    slot(diameter, width);
}

// center body
module body(height, width) {
    square([height, width], center =true);
}

// thread slots
// position is 45 degrees into the first quardant
module thread_slot(width, diameter) {
        slot(width, diameter*2, center=false);
}

// thread hole
// positioned centered on origin
module thread_hole(shape="Circle", size=diameter) {
    if (shape == "Circle") {
        circle(size/2, center=true);
    }
    if (shape == "Heart"){
        translate([0,-size/2]) heart_2D(size);
    }
}

module some_slots(slots, slot_width, diameter) {
    if (slots > 0) {
        angles = [60, 120, 90, 75, 105];
        positions = [-width/4, width/4, 0, -width/8, width/8];
        for (i=[0:slots-1]) {
        color("red") translate([positions[i],-height/2])
            rotate([0,0,angles[i]])
                thread_slot(slot_width, diameter);
        }
    }
}

module floss_card_2D() {
    difference()
    {
        union() {
            translate([0, (height-diameter)/2]) end(diameter, width);
            body(width-diameter, height-diameter*2);
            translate([0, -(height-diameter)/2]) end(diameter, width);
        }
        some_slots(slots, slot_width, diameter);
        translate([0,height/2-diameter]) color("blue") thread_hole(shape=Hole, size=diameter);
    }
}

// make the card
linear_extrude(height=thickness, convexity = 10)
    floss_card_2D();
// top text
translate([-width/2+diameter/2, height/2-diameter/2-font_size*0.8])
    color("red")
        write(top_text, h=diameter/2, t = thickness+text_emboss_height, font=font, h=font_size);
// bottom text
translate([-width/2+diameter/2, -height/2+diameter/2-2])
    color("red")
        write(bottom_text, h=diameter/2, t=thickness+text_emboss_height, font=font, h=font_size);
translate([0,0,10])
    color("blue")
        thread_hole(shape="Hole", size=8);

```


[User]
I'm looking to design a custom camera mount screw, and I'd like your help with the OpenSCAD code. Basically, it'll have a knurled knob at the top and a screw thread below.

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

**General:**

*   `height`: The overall length of the threaded portion.
*   `diameterKnob`: The diameter of the knob.
*   `heightKnob`: The height of the knob.

**Knurling:**

*   `knurlWidth`: The width of each knurl tooth.
*   `knurlHeight`: The height of each knurl tooth.
*   `knurlDepth`: How far the knurl tooth extends outward from the knob's surface.
*   `knurlEndSmooth`: The height of the smoothed section at the top and bottom of the knurl.
*   `knurlSurfaceSmooth`: A percentage that determines how much the sharp tips of the knurl are smoothed.

**Thread:**

*   `diameterThread`: The diameter of the threaded section.
*   `step`: The pitch of the thread.
*   `roundness`: Controls the number of sides used to approximate the thread profile.
*   `degrees`: The thread angle.

I'd like the code to output a single file or multiple files if necessary but it should be clear how they are related, including the main file where I'll specify all the parameters I just listed. I'd like it to use the standard OpenSCAD language rather than any particular libraries.

Could you generate the OpenSCAD code for this, please?

[Assistant]
camera_screw.scad:
```
/* [General] */
// Height of the thread
height = 10;
// Diameter of the knob
diameterKnob = 15;
// Height of the knob
heightKnob = 6;

/* [Knurl Settings] */
knurlWidth = 3;
knurlHeight = 4;
knurlDepth = 1.5;
knurlEndSmooth = 2;
knurlSurfaceSmooth = 0;

/* [Thread Settings] */
diameterThread = 6;
step = 1.2;
roundness = 4;
degrees = 45;

/* [Hidden] */
PI=3.141592;

knurled_cyl(heightKnob, diameterKnob,
            knurlWidth, knurlHeight, knurlDepth,
            knurlEndSmooth, knurlSurfaceSmooth);

/*
 * Countersink style:
 *                         -2 - Not even flat ends
 *                         -1 - Bottom (countersink'd and top flat)
 *                          0 - None (top and bottom flat)
 *                          1 - Top (bottom flat)
 *                          2 - Both (countersink'd)
 */
translate([0, 0, heightKnob])
  screw_thread(diameterThread, step, degrees, height,
               PI / roundness, 1);

/*
 * knurledFinishLib.scad
 *
 * Written by aubenc @ Thingiverse
 *
 * This script is licensed under the Public Domain license.
 *
 * http://www.thingiverse.com/thing:9095
 *
 * Usage:
 *
 *    knurled_cyl( Knurled cylinder height,
 *                 Knurled cylinder outer diameter,
 *                 Knurl polyhedron width,
 *                 Knurl polyhedron height,
 *                 Knurl polyhedron depth,
 *                 Cylinder ends smoothed height,
 *                 Knurled surface smoothing amount );
 */
module knurled_cyl(chg, cod, cwd, csh, cdp, fsh, smt)
{
    cord=(cod+cdp+cdp*smt/100)/2;
    cird=cord-cdp;
    cfn=round(2*cird*PI/cwd);
    clf=360/cfn;
    crn=ceil(chg/csh);

    intersection()
    {
        shape(fsh, cird, cord-cdp*smt/100, cfn*4, chg);

        translate([0,0,-(crn*csh-chg)/2])
          knurled_finish(cord, cird, clf, csh, cfn, crn);
    }
}

module shape(hsh, ird, ord, fn4, hg)
{
        union()
        {
            cylinder(h=hsh, r1=ird, r2=ord, $fn=fn4, center=false);

            translate([0,0,hsh-0.002])
              cylinder(h=hg-2*hsh+0.004, r=ord, $fn=fn4, center=false);

            translate([0,0,hg-hsh])
              cylinder(h=hsh, r1=ord, r2=ird, $fn=fn4, center=false);
        }

}

module knurled_finish(ord, ird, lf, sh, fn, rn)
{
    for(j=[0:rn-1])
    assign(h0=sh*j, h1=sh*(j+1/2), h2=sh*(j+1))
    {
        for(i=[0:fn-1])
        assign(lf0=lf*i, lf1=lf*(i+1/2), lf2=lf*(i+1))
        {
            polyhedron(
                points=[
                     [ 0,0,h0],
                     [ ord*cos(lf0), ord*sin(lf0), h0],
                     [ ird*cos(lf1), ird*sin(lf1), h0],
                     [ ord*cos(lf2), ord*sin(lf2), h0],

                     [ ird*cos(lf0), ird*sin(lf0), h1],
                     [ ord*cos(lf1), ord*sin(lf1), h1],
                     [ ird*cos(lf2), ird*sin(lf2), h1],

                     [ 0,0,h2],
                     [ ord*cos(lf0), ord*sin(lf0), h2],
                     [ ird*cos(lf1), ird*sin(lf1), h2],
                     [ ord*cos(lf2), ord*sin(lf2), h2]
                    ],
                triangles=[
                     [0,1,2],[2,3,0],
                     [1,0,4],[4,0,7],[7,8,4],
                     [8,7,9],[10,9,7],
                     [10,7,6],[6,7,0],[3,6,0],
                     [2,1,4],[3,2,6],[10,6,9],[8,9,4],
                     [4,5,2],[2,5,6],[6,5,9],[9,5,4]
                    ],
                convexity=5);
         }
    }
}

/*
 *    polyScrewThread_r1.scad    by aubenc @ Thingiverse
 *
 * This script contains the library modules that can be used to generate
 * threaded rods, screws and nuts.
 *
 * http://www.thingiverse.com/thing:8796
 *
 * CC Public Domain
 */

module screw_thread(od,st,lf0,lt,rs,cs)
{
    or=od/2;
    ir=or-st/2*cos(lf0)/sin(lf0);
    pf=2*PI*or;
    sn=floor(pf/rs);
    lfxy=360/sn;
    ttn=round(lt/st+1);
    zt=st/sn;

    intersection()
    {
        if (cs >= -1)
        {
           thread_shape(cs,lt,or,ir,sn,st);
        }

        full_thread(ttn,st,sn,zt,lfxy,or,ir);
    }
}

module hex_nut(df,hg,sth,clf,cod,crs)
{

    difference()
    {
        hex_head(hg,df);

        hex_countersink_ends(sth/2,cod,clf,crs,hg);

        screw_thread(cod,sth,clf,hg,crs,-2);
    }
}

module hex_screw(od,st,lf0,lt,rs,cs,df,hg,ntl,ntd)
{
    ntr=od/2-(st/2)*cos(lf0)/sin(lf0);

    union()
    {
        hex_head(hg,df);

        translate([0,0,hg])
        if ( ntl == 0 )
        {
            cylinder(h=0.01, r=ntr, center=true);
        }
        else
        {
            if ( ntd == -1 )
            {
                cylinder(h=ntl+0.01, r=ntr, $fn=floor(od*PI/rs), center=false);
            }
            else if ( ntd == 0 )
            {
                union()
                {
                    cylinder(h=ntl-st/2,
                             r=od/2, $fn=floor(od*PI/rs), center=false);

                    translate([0,0,ntl-st/2])
                    cylinder(h=st/2,
                             r1=od/2, r2=ntr,
                             $fn=floor(od*PI/rs), center=false);
                }
            }
            else
            {
                cylinder(h=ntl, r=ntd/2, $fn=ntd*PI/rs, center=false);
            }
        }

        translate([0,0,ntl+hg]) screw_thread(od,st,lf0,lt,rs,cs);
    }
}

module hex_screw_0(od,st,lf0,lt,rs,cs,df,hg,ntl,ntd)
{
    ntr=od/2-(st/2)*cos(lf0)/sin(lf0);

    union()
    {
        hex_head_0(hg,df);

        translate([0,0,hg])
        if ( ntl == 0 )
        {
            cylinder(h=0.01, r=ntr, center=true);
        }
        else
        {
            if ( ntd == -1 )
            {
                cylinder(h=ntl+0.01, r=ntr, $fn=floor(od*PI/rs), center=false);
            }
            else if ( ntd == 0 )
            {
                union()
                {
                    cylinder(h=ntl-st/2,
                             r=od/2, $fn=floor(od*PI/rs), center=false);

                    translate([0,0,ntl-st/2])
                    cylinder(h=st/2,
                             r1=od/2, r2=ntr,
                             $fn=floor(od*PI/rs), center=false);
                }
            }
            else
            {
                cylinder(h=ntl, r=ntd/2, $fn=ntd*PI/rs, center=false);
            }
        }

        translate([0,0,ntl+hg]) screw_thread(od,st,lf0,lt,rs,cs);
    }
}

module thread_shape(cs,lt,or,ir,sn,st)
{
    if ( cs == 0 )
    {
        cylinder(h=lt, r=or, $fn=sn, center=false);
    }
    else
    {
        union()
        {
            translate([0,0,st/2])
              cylinder(h=lt-st+0.005, r=or, $fn=sn, center=false);

            if ( cs == -1 || cs == 2 )
            {
                cylinder(h=st/2, r1=ir, r2=or, $fn=sn, center=false);
            }
            else
            {
                cylinder(h=st/2, r=or, $fn=sn, center=false);
            }

            translate([0,0,lt-st/2])
            if ( cs == 1 || cs == 2 )
            {
                  cylinder(h=st/2, r1=or, r2=ir, $fn=sn, center=false);
            }
            else
            {
                cylinder(h=st/2, r=or, $fn=sn, center=false);
            }
        }
    }
}

module full_thread(ttn,st,sn,zt,lfxy,or,ir)
{
  if(ir >= 0.2)
  {
    for(i=[0:ttn-1])
    {
        for(j=[0:sn-1])
			assign( pt = [	[0,                  0,                  i*st-st            ],
                        [ir*cos(j*lfxy),     ir*sin(j*lfxy),     i*st+j*zt-st       ],
                        [ir*cos((j+1)*lfxy), ir*sin((j+1)*lfxy), i*st+(j+1)*zt-st   ],
								[0,0,i*st],
                        [or*cos(j*lfxy),     or*sin(j*lfxy),     i*st+j*zt-st/2     ],
                        [or*cos((j+1)*lfxy), or*sin((j+1)*lfxy), i*st+(j+1)*zt-st/2 ],
                        [ir*cos(j*lfxy),     ir*sin(j*lfxy),     i*st+j*zt          ],
                        [ir*cos((j+1)*lfxy), ir*sin((j+1)*lfxy), i*st+(j+1)*zt      ],
                        [0,                  0,                  i*st+st            ]	])
        {
            polyhedron(points=pt,
              		  triangles=[	[1,0,3],[1,3,6],[6,3,8],[1,6,4],
											[0,1,2],[1,4,2],[2,4,5],[5,4,6],[5,6,7],[7,6,8],
											[7,8,3],[0,2,3],[3,2,7],[7,2,5]	]);
        }
    }
  }
  else
  {
    echo("Step Degrees too agresive, the thread will not be made!!");
    echo("Try to increase de value for the degrees and/or...");
    echo(" decrease the pitch value and/or...");
    echo(" increase the outer diameter value.");
  }
}

module hex_head(hg,df)
{
	rd0=df/2/sin(60);
	x0=0;	x1=df/2;	x2=x1+hg/2;
	y0=0;	y1=hg/2;	y2=hg;

	intersection()
	{
	   cylinder(h=hg, r=rd0, $fn=6, center=false);

		rotate_extrude(convexity=10, $fn=6*round(df*PI/6/0.5))
		polygon([ [x0,y0],[x1,y0],[x2,y1],[x1,y2],[x0,y2] ]);
	}
}

module hex_head_0(hg,df)
{
    cylinder(h=hg, r=df/2/sin(60), $fn=6, center=false);
}

module hex_countersink_ends(chg,cod,clf,crs,hg)
{
    translate([0,0,-0.1])
    cylinder(h=chg+0.01,
             r1=cod/2,
             r2=cod/2-(chg+0.1)*cos(clf)/sin(clf),
             $fn=floor(cod*PI/crs), center=false);

    translate([0,0,hg-chg+0.1])
    cylinder(h=chg+0.01,
             r1=cod/2-(chg+0.1)*cos(clf)/sin(clf),
             r2=cod/2,
             $fn=floor(cod*PI/crs), center=false);
}
```


[User]
Hey, I'm looking to create a flashlight diffuser in OpenSCAD, and I'd like it to be parametric so I can adjust it for different flashlights. Here's the basic idea:

It should have two main parts: a collar that fits snugly around the flashlight and a diffuser section that extends outwards and diffuses the light. I'm thinking the diffuser should be spherical.

Here are the parameters I’d like to control:

*   `flashlightDiameter`: The diameter of the flashlight itself.
*   `collarThickness`: How thick the collar will be.
*   `collarHeight`: The height of the collar.
*   `overallHeight`: The total height of the diffuser, including both the collar and the diffuser sections.
*   `diffuserWallThickness`: How thick the diffuser's walls will be.

The overall diameter should be calculated as `flashlightDiameter + 2 * collarThickness`. The diffuser height will be `overallHeight - collarHeight`.

The collar should be a simple cylinder with an inner diameter matching the flashlight and an outer diameter calculated using the `collarThickness` parameter. The diffuser section should be a sphere shape that's then hollowed out, and connected to the collar. The diffuser section should be positioned right on top of the collar.

I'd like the whole thing to be built using `linear_extrude` for the collar and a combination of `resize` and `sphere` commands to make the diffuser. I think `difference` can be used to make the hollowing in both the collar and the diffuser. I'm thinking that a `cube` command and additional translation may be needed in the diffuser module to cut out the part that extends into the collar from the spherical diffuser. The `union` command should be used to combine everything, as usual. No need for any external libraries or files.

[Assistant]
flashlight_diffuser.scad:
```
/******************************************************************************
 *
 *  GLOBALS
 *
 ******************************************************************************/

flashlightDiameter = 32;
collarThickness = 2;
collarHeight = 12;
overallHeight = 100;
diffuserWallThickness = 2;

/* [Hidden] */
$fa = 1;
$fs = 0.5;

overallDiameter = flashlightDiameter + 2 * collarThickness;
diffuserHeight = overallHeight - collarHeight;

/******************************************************************************
 *
 *  EXECUTION
 *
 ******************************************************************************/
union()
{
    collar();
    diffuser();
}

/***************************************************************************
 *
 *  DIRECT MODULES
 *
 ******************************************************************************/

module collar()
{
    linear_extrude(height = collarHeight, convexity = 10)
    {
        _collarPlane();
    }
}

module diffuser()
{
    translate([0, 0, collarHeight])
        _diffuserShape();
}

/******************************************************************************
 *
 *  HELPER AND COMPONENT MODULES
 *
 ******************************************************************************/

module _collarPlane()
{
    difference()
    {
        circle(r = overallDiameter / 2);
        circle(r = flashlightDiameter / 2);
    }
}

module _diffuserShape()
{
    difference()
    {
        resize([overallDiameter, overallDiameter, diffuserHeight * 2])
            sphere(r = diffuserHeight);
        resize([overallDiameter - 2 * diffuserWallThickness, overallDiameter - 2 * diffuserWallThickness, (diffuserHeight - diffuserWallThickness) * 2])
            sphere(r = diffuserHeight);
        translate([0, 0, -overallHeight / 2 - 0.5])
            cube(size=[overallDiameter + 1, overallDiameter + 1, overallHeight + 1], center = true);
    }
}
```


[User]
I'm looking to design a series of models for small-scale model railroading, specifically focusing on Czechoslovakian "Uacs" bulk material carriages. I'm targeting scales from Z (1:220) up to H0 (1:87), but I'd like the models to be parametric so I can easily adjust them for N (1:160) and TT (1:120) as well. I have a base design in mind that should be easily modifiable.

Here’s what I need in terms of features:

1.  **Parametric Scaling**: The entire design should be easily scalable using a single `model_scale` variable. I've been using `model_scale = 220` for Z, `160` for N, `120` for TT, and `87` for H0. Please use those numbers to implement that scaling. This will include all dimensions, including lengths, heights, widths and radii of any cylinders or spheres.
2.  **Chassis**: The chassis should have a customizable `chassis_wall_thickness`, using 0.6 as a default. I need the ability to choose whether to include the bumpers directly on the chassis part, controlled by `include_bumpers_to_chassis = true/false` (defaulting to true). The chassis will include attachment points for the bogies, described below.
3.  **Bogie Attachment**: There should be a way to join a wheel module using a pivoting cylinder and bolt hole. The `bolt_hole` diameter should be adjustable (default to 2.5mm for M2.5 bolts). The `bogie_offset` (distance from the chassis edge to the joining cylinder) should be adjustable; its default is 13.2. The pivoting cylinder's `bogie_pivot_d` (diameter) is 5 and `bogie_pivot_h` (height) is 2.6 by default.
4.  **Barrel (Hopper) Design**: The Uacs has two main barrels. Each barrel should be created using a `minkowski()` operation with spheres and cylinders to create rounded shapes at the transitions between different cylinder sections.
    *   The main barrel's diameter (`barrel_d`) is 3100 / model_scale
    *   The top barrel diameter (`barrel_top_d`) is 600 / model_scale
    *   The center height of the barrel (`barrel_center_h`) is 650 / model_scale
    *   The top height of the barrel (`barrel_top_h`) is 1050 / model_scale
    *   The bottom height of the barrel (`barrel_bottom_h`) is 1000 / model_scale
    *   The bottom diameter of the barrel (`barrel_bottom_d`) is 1650 / model_scale
    *   The round over radius on the barrel (`barrel_round_r`) is 160 / model_scale
    *   The barrel height, `barrel_h` is the sum of the top, center, and bottom heights.
    *   The distance between the two barrels (`barrels_distance`) is 3200 / model_scale
5.  **Carriage Body**: The body of the carriage should have a trapezoidal profile, transitioning from a `body_top_width` of 2000 / model_scale to a `body_bottom_width` of 2700 / model_scale. The lengths are `body_top_length` of 11800 / model_scale and `body_bottom_length` of 12500 / model_scale. The `body_height` is 800 / model_scale, and it's offset from the main carriage by `body_y_offset` of 600 / model_scale.
6.  **Overall Dimensions**:
    *   `chassis_length`: 13300 / model_scale
    *   `chassis_height`: 380 / model_scale
    *   `chassis_width`: 2700 / model_scale
7.  **Bumpers**:
    *   `bumper_distance`: 1750 / model_scale
    *   `bumper_length`: 620 / model_scale
    *   `bumper_shaft_d`: 238 / model_scale
    *   `bumper_head_d`: 490 / model_scale
    *   `bumper_head_h`: 100 / model_scale
8.  **Ladder**:
    *   `ladder_step_h`: 350 / model_scale
    *   `ladder_w`: 400 / model_scale
    *   `ladder_thickness`: 80 / model_scale
9.  **Handlebar**:
    *   `handlebar_h`: 1200 / model_scale

I'd also like it if you could provide two main modules: one for viewing the "parts" separately, and one for the "arranged" model. This is controlled by `view = "parts"` or `view = "arranged"`.

I would appreciate if you could generate all of the necessary `.scad` files, without relying on any external libraries - please do not include any `use <>` statements in your code.

[Assistant]
uacs.scad:
```
/*******************************************************************\
|         __  ____       _ ____        _ __                         |
|        /  |/  (_)___  (_) __ \____ _(_) /      ______ ___  __     |
|       / /|_/ / / __ \/ / /_/ / __ `/ / / | /| / / __ `/ / / /     |
|      / /  / / / / / / / _, _/ /_/ / / /| |/ |/ / /_/ / /_/ /      |
|     /_/  /_/_/_/ /_/_/_/ |_|\__,_/_/_/ |__/|__/\__,_/\__, /       |
|                                                     /____/        |
|*******************************************************************|
|                                                                   |
|        Czechoslovakian bulk materials carriage "Uacs"             |
|                                                                   |
|                      designed by Svenny                           |
|                                                                   |
|       source: https://www.thingiverse.com/thing:2749128           |
|                                                                   |
\*******************************************************************/

/* [VIEW] */
// rendering precission
$fn=140;
// what to show
view = "arranged"; // [parts, arranged]
// scale
model_scale = 160; // Z=220, N=160, TT=120, H0=87
// include bumpers to chassis part (easier to print but not as nice)
include_bumpers_to_chassis = true;
// wall thickness of the chassis part
chassis_wall_thickness = 0.6;

/* [JOIN WHEEL MODULE ] */
// bolt hole diameter (default 2.4mm for M2.5 bolts)
bolt_hole = 2.5;
// center of the joining cylinder from the edge of the chassis (without bumpers!)
bogie_offset = 13.2;
// pivoting cylinder diameter
bogie_pivot_d = 5;
// pivoting cylinder height
bogie_pivot_h = 2.6;

barrel_d = 3100 / model_scale;
barrel_top_d = 600 / model_scale;
barrel_center_h = 650 / model_scale;
barrel_top_h = 1050 / model_scale;
barrel_bottom_h = 1000 / model_scale;
barrel_bottom_d = 1650 / model_scale;
barrel_round_r = 160 / model_scale;
barrel_h = barrel_top_h + barrel_bottom_h + barrel_center_h;
barrels_distance = 3200 / model_scale;

body_top_width = 2000 / model_scale;
body_bottom_width = 2700 / model_scale;
body_top_length = 11800 / model_scale;
body_bottom_length = 12500 / model_scale;
body_height = 800 / model_scale;
body_y_offset = 600 / model_scale;

chassis_length = 13300 / model_scale;
chassis_height = 380 / model_scale;
chassis_width = 2700 / model_scale;

bumper_distance = 1750 / model_scale;
bumper_length = 620 / model_scale;
bumper_shaft_d = 238 / model_scale;
bumper_head_d = 490 / model_scale;
bumper_head_h = 100 / model_scale;

ladder_step_h = 350 / model_scale;
ladder_w = 400 / model_scale;
ladder_thickness = 80 / model_scale;

handlebar_h = 1200 / model_scale;

module bumper() {
    cylinder(d=bumper_head_d, h=bumper_head_h);
    cylinder(d=bumper_shaft_d, h=bumper_length);
}

module barrel() {
    difference() {
        intersection() {
            union() {
                minkowski() {
                    union() {
                        cylinder(r1=barrel_bottom_d/2-barrel_round_r,
                                 r2=barrel_d/2-barrel_round_r,
                                 h=barrel_bottom_h);
                        translate([0,0,barrel_bottom_h])
                        cylinder(r=barrel_d/2-barrel_round_r,
                                 h=barrel_center_h);
                        translate([0,0,barrel_bottom_h + barrel_center_h])
                        cylinder(r1=barrel_d/2-barrel_round_r,
                                 r2=barrel_top_d/2-barrel_round_r,
                                 h=barrel_top_h);
                    }

                    sphere(r=barrel_round_r);
                }
                translate([0,0,barrel_bottom_h + barrel_center_h + barrel_top_h])
                cylinder(r=barrel_top_d/2,
                         h=barrel_round_r);
            }

            cylinder(d=2*barrel_d,
                     h=2*(barrel_h));
        }

        cylinder(d=3.2, h=3);
    }
}

module ladder(length) {
    translate([0,0,ladder_thickness/2]) {
        for(x=[-1,1])
            translate([x*ladder_w/2, 0, 0])
            cube([ladder_thickness, length, ladder_thickness], center=true);

        for(y=[-length/2+ladder_step_h:ladder_step_h:length/2])
            translate([0, y, 0])
            cube([ladder_w, ladder_thickness, ladder_thickness], center=true);
    }
}

module small_step() {
    translate([-body_y_offset/2, ladder_step_h, 0])
    cube([body_y_offset, ladder_thickness, 2.5*ladder_thickness]);
    translate([-body_y_offset/2, -chassis_height/2, 0])
    cube([body_y_offset, chassis_height, 0.2]);
    translate([-body_y_offset/2, 0, 0])
    cube([ladder_thickness, ladder_step_h, ladder_thickness]);
    translate([body_y_offset/2-ladder_thickness, 0, 0])
    cube([ladder_thickness, ladder_step_h, ladder_thickness]);
}

module bridge() {
    bridge_h = barrel_h - 0.6*barrel_top_h;
    translate([0,0,-bridge_h+ladder_thickness/2])
    difference() {
        hull()
        intersection() {
            union() {
                for(y=[-barrels_distance/2, barrels_distance/2])
                    translate([0,y,0]) barrel();
            }
            translate([0,0,bridge_h])
            cube([body_top_width-2*ladder_thickness,
                  barrels_distance,
                  ladder_thickness], center=true);
        }
        for(y=[-barrels_distance/2, barrels_distance/2])
            translate([0,y,0]) barrel();
    }
}

module front_handlebar() {
    translate([0,-chassis_height/2,ladder_thickness/2])
    difference() {
        cube([chassis_width,
              handlebar_h+chassis_height,
              ladder_thickness], center=true);
        translate([0,-ladder_thickness,0])
        cube([chassis_width - 2*ladder_thickness,
              handlebar_h+chassis_height,
              2*ladder_thickness], center=true);
    }
    translate([0, -(handlebar_h+chassis_height)/2, 0.1])
    difference() {
        cube([chassis_width, chassis_height, 0.2], center=true);
        cube([bumper_distance+2*bumper_shaft_d, 2*chassis_height, 2], center=true);
    }
}

module body() {
    difference() {
        union() {
            hull() {
                translate([0,0,body_height/2])
                cube([body_top_width, body_top_length, body_height],
                     center=true);
                translate([0,0,0.05])
                cube([body_bottom_width, body_bottom_length, 0.1], center=true);
            }
            for(y=[-1.5*barrels_distance:barrels_distance:1.5*barrels_distance])
                translate([0,y,body_height]) cylinder(d=3, h=1);
        }

        translate([0,body_y_offset/2,0])
        for(y=[-1, 1, -0.2, 0.2])
            translate([0,
                       y * (chassis_length/2 - bogie_offset),
                       -chassis_wall_thickness])
            cylinder(d=bolt_hole, h=body_height);
    }
}

module chassis() {
    difference() {
        union() {
            translate([0,0,chassis_height/2])
            difference() {
                cube([chassis_width,
                      chassis_length,
                      chassis_height], center=true);
                translate([0,0,chassis_wall_thickness])
                cube([chassis_width - 2*chassis_wall_thickness,
                      chassis_length - 2*chassis_wall_thickness,
                      chassis_height], center=true);
                translate([0,0,chassis_wall_thickness])
                cube([bumper_distance-bumper_shaft_d,
                      chassis_length+10,
                      chassis_height], center=true);
            }
            for(y=[-1,1])
                translate([0,
                           y * (chassis_length/2 - bogie_offset),
                           chassis_wall_thickness])
                cylinder(d=bogie_pivot_d, h=bogie_pivot_h);
        }
        for(y=[-1,1]) {
            // wheel module
            translate([0,
                       y * (chassis_length/2 - bogie_offset),
                       chassis_wall_thickness])
            cylinder(d=bolt_hole, h=100, center=true);

            // join chassis + body (+ weight)
            translate([0,
                       0.2 * y * (chassis_length/2 - bogie_offset),
                       chassis_wall_thickness])
            cylinder(d=bolt_hole+0.3, h=100, center=true);
        }

        if(!include_bumpers_to_chassis)
            for(za=[0,180])
                rotate(za)
                for(x=[-bumper_distance/2, bumper_distance/2])
                    translate([x*1.1, chassis_length/2,
                               chassis_height/2])
                    rotate([90,0,0])
                    cylinder(d=bumper_shaft_d+0.1, h=1.5*chassis_wall_thickness);
    }

    if(include_bumpers_to_chassis)
        for(za=[0,180])
            rotate(za)
            for(x=[-bumper_distance/2, bumper_distance/2])
                translate([x*1.1, bumper_length+chassis_length/2,
                           bumper_shaft_d/2])
                rotate([90,0,0])
                intersection() {
                    bumper();
                    cube([bumper_head_d, bumper_shaft_d, 3*bumper_length],
                         center=true);
                }
}

module parts() {
    translate([6400/model_scale,0,0])
    body();

    translate([3200/model_scale,0,0])
    chassis();

    ladder_l = 2.95*(barrel_center_h+barrel_top_h+barrel_bottom_h);
    translate([-1600/model_scale, -ladder_l/3, 0])
    ladder(ladder_l);

    for(i=[0,1]) {
        translate([-2500/model_scale, (5600-i*1000)/model_scale, 0])
        small_step();

        translate([-3200/model_scale, -(5600-i*2600)/model_scale, 0])
        bridge();
    }

    translate([-3200/model_scale,0,0]) rotate(90) front_handlebar();

    for(y=[-1.5:1.5])
        translate([0,y*3500/model_scale,0])
        barrel();

    if(!include_bumpers_to_chassis)
        for(y=[3:6])
            translate([-1600/model_scale,2*y*bumper_head_d,0])
            bumper();
}

module arranged() {
    body();

    translate([0,0,body_height])
    for(y=[-1.5*barrels_distance:barrels_distance:1.5*barrels_distance])
        translate([0,y,0]) barrel();

    for(y=[-1,1]) {
        translate([-body_top_width/2,
                   y*barrels_distance,
                   0.85*barrel_h/2+body_height])
        rotate([90,0,90])
        ladder(0.85*barrel_h);

        translate([0,y*barrels_distance,body_height+barrel_h-0.6*barrel_top_h])
        bridge();

        translate([y*chassis_width/2,
                   (body_y_offset+body_bottom_length)/2,
                   -ladder_step_h/2])
        rotate([-90,0,-y*90])
        small_step();
    }

    translate([0, body_y_offset/2+chassis_length/2, handlebar_h/2])
    rotate([90,0,180])
    front_handlebar();

    mirror([0,0,1])
    translate([0,body_y_offset/2,0]) {
        chassis();
        if(!include_bumpers_to_chassis)
            for(za=[0,180])
                rotate(za)
                for(x=[-bumper_distance/2, bumper_distance/2])
                    translate([1.1*x, bumper_length+chassis_length/2,
                               chassis_height/2])
                    rotate([90,0,0]) bumper();
    }
}

if(view == "arranged")
    arranged();
else if(view == "parts")
    parts();

```


[User]
Hi, I'm looking to create a custom biquad yagi antenna, and I'd like your help with generating the OpenSCAD files for it. I've seen a design that seems like a good starting point, and I'd like to modify and customize it for my specific needs.

Here are the key parameters I'm looking to control:

*   **Frequency:** I need to be able to specify the center frequency of the antenna, in MHz, and all calculations should be based on this.
*   **Element Diameter:** I need to define the diameter of the wire used for the elements, in mm. I'll probably use some slightly thicker wire than is needed to compensate for 3D printer over-extrusion.
*   **Frame Thickness:** I need to control the thickness of the frame surrounding the antenna elements, including:
    *   The thickness of the outer wall
    *   The thickness of the inner wall
    *   The thickness of the material between the antenna wire and the bottom face of the frame
*   **Biquad Length:** The length of each straight section of the biquad element needs to be controllable, and will be a fraction of the wavelength.
*   **Parasitic Elements:** I'll need to be able to define the number of parasitic elements to include. If I set this to 0, then no director elements should be created.
*   **Reflector:** I'd like the option to either include or exclude a reflector element.
*   **Boom Tube:** I would like an option to create a boom for the yagi, and its length should be based on the spacing of the reflector and director elements. I should also be able to control:
    *   The thickness of the boom tube wall
    *   The thickness of the rear wall of the boom tube (with an option to remove it)
    *  An offset value to make the boom tube smaller than the holes in the frame to account for printer over-extrusion
    *  A scaling value for the boom tube cutout, based on the length of the smallest parasitic element minus the inner wall thickness.
    *  A diameter value for an optional bolt hole in the boom tube.
*   **Fillet Size:** I want to adjust the size of the frame support fillets with a decimal value between 0 and 1.

I realize some of the parameters, like the speed of light, will remain constant. But other things like the spacing of the directors and reflectors, as well as the size of each successive director, will need to be calculated based on the frequency, I think. There also needs to be a way to account for the conductivity of different wire materials.

I also want to create a cutout in the frame for the wire elements, and it will need to be mirrored in all four directions. I will need to generate a centered insulator in the center of the wire, as well as a cutaway for the wire.

I think the final design should include a separate hole for the driven element to allow the feed line to pass through it.

Finally, I'd also like to see some console output, including the length of the driven element, reflector element, each director element, as well as the boom tube diameter, length, and reflector/director spacing.

I don't have any code for you, but I'm hoping you can generate the necessary OpenSCAD files from scratch, making use of libraries like BOSL2 if that's helpful.

[Assistant]
BiquadYagiGenerator.scad:
```
echo("");echo("");echo("");
/*
Use this file to create a custom biquad yagi antenna to suit your needs.  The initial variable values are taken from
multiple sources including Andrew McNeil's 2.4 GHz antenna design. They should only be considered to be a starting
point for your design.

Nothing here is set in stone (except the speed of light), so change anything you like.

Acknowledgment:
Andrew McNeil - for original 2.4 GHz antenna design, and inspiration.
Check out his youtube channel dedicated to antenna design and theory:  https://www.youtube.com/user/8bitandrewmcneil

Author:
Jeremy Carter
Thingiverse: https://www.thingiverse.com/ReallyBigTeeth/designs
E-mail: reallybigteeth@hotmail.com

Please Don't share this file directly on your website or forum,
instead post a link to the file source: https://www.thingiverse.com/thing:2749265

Biquad Yagi Antenna Customizer - OpenSCAD is licensed under the Creative Commons - Attribution - Share Alike license.
http://creativecommons.org/licenses/by-sa/3.0/

*/

// ************** \/ Basic Settings \/ **********************************************************************************

antennaFrequency = 2442; // MHz // Desired centre frequency for the antenna.

elementDiameter = 1.61; // mm // Diameter of wire used for the elements.  add a little extra to compensate for printer over-extrusion.

outerWallThickness = 2; // mm // Too low a value will create a break in the wall at the centre of the antenna.

innerWallThickness = 2; // mm // Keep it larger than or equal to 0.5 mm.

bottomThickness = 1; // mm // Material thickness between antenna wire and bottom face of the frame.

lambdaMultiplier = 1/4; // Input fraction of wavelength.  1/4 is default.  This determines the length of each straight section of the biquad elements.

numberOfParasiticElements = 4; // If 0, no director elements will be built.

createReflector = true; // true or false // Build a reflector?

createBoomTube = true; // true or false // Build a boom for the yagi.  The length will be based on the reflectorSpacing & directorSpacing values in the next section.

boomTubeWallThickness = 1; // mm //

boomTubeRearWallThickness = 5; // mm // 0 removes the rear wall of the tube.

boomTubeDiameterOffset = .1; // mm // .1 // This makes the boom tube smaller than the holes in the frame to correct for printer over extrusion.  For a single wall extrusion, make this value slightly larger than your printer's extrusion diameter.

boomTubeCutoutScale = 1; // Decimal value from 0 to 1 // Default is 1 // Based on element length of the smallest parasitic element minus the innnerWallThickness.

boomTubeBoltHoleDiameter = 3; // mm // 0 for no hole //  Bolt hole in the boom tube for mounting the antenna to a stand or sheet metal reflector etc.

filletSize = .5; // 0 - 1 // Decimal value from 0 to 1 // default is .5 // Size of the frame support fillet.

// ************** \/ Advanced Settings & Constants \/ *******************************************************************

lightSpeed = 299792458000; // 299792458000 // mm per second.

lambda = lightSpeed / (antennaFrequency * 1000000);

directorSpacing = lambda * .138476; // .125 // Value output to console.  This also partially determines the lenght of the boom tubes.

reflectorSpacing = lambda * .154767; // .2 // Value output to console.  This also partially determines the lenght of the boom tubes.

reflectorMultiplier = 1.0378045; // 1.05 // How much bigger is the reflector than the driven element.

directorMultiplier = .9621955; // .05 // How much smaller is each successive director.

conductivityCorrection = 1.02635; // Multiplied by element length to correct for the resistance of the wire used (copper, silver, steel, etc.).

// ************** \/ Don't Change These \/ ******************************************************************************

elementLength = lambda * lambdaMultiplier * conductivityCorrection;

hypotDiameter = sqrt(pow(elementDiameter, 2)  * 2);

hypotInsulator = sqrt(.5);

wireChamfer = elementDiameter + .5 - hypotDiameter / 2;

boomCutoutDiameter = elementLength * pow(directorMultiplier, numberOfParasiticElements);

boom = ((boomCutoutDiameter * boomTubeCutoutScale / 2) - (innerWallThickness) - (elementDiameter)) * 2;

frameThickness = elementDiameter + bottomThickness;

boomTubeLength =  frameThickness + reflectorSpacing + (directorSpacing * numberOfParasiticElements);

// ***************  Boom Tube Cutout  ***********************************************************************************

module boomTubeCutOut(directorLength, tubeHeight){
    translate([(directorLength / 2) - (elementDiameter / 2), (directorLength / 2) - (elementDiameter / 2), -(frameThickness) -2]){
        cylinder(h = tubeHeight, r = (directorLength / 2) - (innerWallThickness) - (elementDiameter), $fn=48);
    }
}

module boomTubes(directorLength, tubeHeight){
    boomTubeCutOut(directorLength, tubeHeight);
    mirror([1, 1, 0]) boomTubeCutOut(directorLength, tubeHeight);
}

module boomTubeRearHole(directorLength, tubeHeight){
    translate([(directorLength / 2) - (elementDiameter / 2), (directorLength / 2) - (elementDiameter / 2), -(frameThickness) -2]){
        cylinder(h = tubeHeight, r = (boomTubeBoltHoleDiameter / 2), $fn=48);
    }
}

//boomTubeCutOut(boomCutoutDiameter * boomTubeCutoutScale);

// ***************  Frame Fillet  ***************************************************************************************

module frameFillet(elementLength, h){
    difference(){
        translate([-elementDiameter / 2 - outerWallThickness, elementDiameter / 2 + outerWallThickness, -(frameThickness)]){
            rotate(90, 0, 0) cube([(elementLength - elementDiameter) * filletSize, (elementLength - elementDiameter) * filletSize, h]);
        }
        translate([-(elementLength - elementDiameter) * filletSize - outerWallThickness - elementDiameter / 2, outerWallThickness + elementDiameter / 2, -(frameThickness) -.5]){
            rotate(45, 0, 0) cube([sqrt(pow((elementLength - elementDiameter) * filletSize, 2) * 2), sqrt(pow((elementLength - elementDiameter) * filletSize, 2) * 2), h + 1]);
        }
    }

    difference(){
        translate([elementDiameter / 2 + outerWallThickness, -elementDiameter / 2 - outerWallThickness, -(frameThickness)]){
            rotate(-90, 0, 0) cube([(elementLength - elementDiameter) * filletSize, (elementLength - elementDiameter) * filletSize, h]);
        }

        translate([outerWallThickness + elementDiameter / 2, -(elementLength - elementDiameter) * filletSize - outerWallThickness - elementDiameter / 2, -(frameThickness) -.5]){
            rotate(-45, 0, 0) cube([sqrt(pow((elementLength - elementDiameter) * filletSize, 2) * 2), sqrt(pow((elementLength - elementDiameter) * filletSize, 2) * 2), h + 1]);
        }
    }
}

//frameFillet(elementLength, frameThickness);

// **************  Wire Channel  ****************************************************************************************

module outerBlock(elementLength){
    translate([-(elementDiameter / 2), -(elementDiameter / 2), -elementDiameter]){
        cube([elementLength, elementLength, elementDiameter + 1]);
    }
}

module outerWire(elementLength){
    outerBlock(elementLength);
    mirror([1, 1, 0]) outerBlock(elementLength);
}

module innerBlock(elementLength){
    translate([elementDiameter / 2, elementDiameter / 2, -elementDiameter - 1]){
        cube([elementLength - elementDiameter * 2, elementLength - elementDiameter * 2, elementDiameter + 2]);
    }
}

module innerWire(elementLength){
    innerBlock(elementLength);
    mirror([1, 1, 0]) innerBlock(elementLength);
}

module wire(elementLength){
    difference(){
        outerWire(elementLength);
        innerWire(elementLength);
    }
}

//wire();

// ***************  Frame  **********************************************************************************************

module outerFrameBlock(elementLength){
    translate([-(elementDiameter / 2 + outerWallThickness), -(elementDiameter / 2 + outerWallThickness), -frameThickness]){
        cube([elementLength + outerWallThickness * 2, elementLength + outerWallThickness * 2, frameThickness]);
    }
}

module outerFrame(elementLength){
    outerFrameBlock(elementLength);
    mirror([1, 1, 0]) outerFrameBlock(elementLength);
}

module innerFrameBlock(elementLength){
    translate([(elementDiameter / 2 + innerWallThickness), (elementDiameter / 2 + innerWallThickness), -frameThickness - 1]){
        cube([elementLength - elementDiameter * 2 - innerWallThickness * 2, elementLength - elementDiameter * 2 - innerWallThickness * 2, frameThickness + 2]);
    }
}

module innerFrame(elementLength){
    innerFrameBlock(elementLength);
    mirror([1, 1, 0]) innerFrameBlock(elementLength);
}

module frame(elementLength){
    difference(){
        outerFrame(elementLength);
        if (createBoomTube != true){
            innerFrame(elementLength);
        }
    }

}

//frame();

// ***************  Centre Insulator & Wire Relief  *********************************************************************

module centreInsulator(){
    rotate(a = 45, v = [0, 0, 1]){
        translate([-(hypotDiameter + 2 * hypotInsulator) / 2, -.5, -elementDiameter]){
            cube([hypotDiameter + 2 * hypotInsulator, 1, elementDiameter]);
        }
    }
}

module wireCutaway(){
    rotate(a = 45, v = [0, 0, 1]){
        translate([-wireChamfer, -(elementDiameter * 2 + 1) / 2, -elementDiameter]){
            cube([wireChamfer * 2, elementDiameter * 2 + 1, elementDiameter + 1]);
        }
    }
}

// ***************  Driven Element  *************************************************************************************

module model(elementLength){
    if (createBoomTube == true){
        union(){
            difference(){
                frame(elementLength);
                wire(elementLength);
                wireCutaway();
                boomTubes(boomCutoutDiameter * boomTubeCutoutScale, frameThickness + 4);
            }
            frameFillet(elementLength, frameThickness);
        }
    }
    else{
        union(){
            difference(){
                frame(elementLength);
                wire(elementLength);
                wireCutaway();
            }
            frameFillet(elementLength, frameThickness);
        }
    }
}

echo("Driven Element Length: ", elementLength, "mm");

//model();

// ***************  Director Elements  **********************************************************************************

if(numberOfParasiticElements > 0){
    for(i = [1:numberOfParasiticElements]){
        directorLength = elementLength * pow(directorMultiplier, i);

        echo("director", i, "Element Length: ", directorLength, "mm");

        translate([((elementLength + outerWallThickness * 2) + 2) * i, (-((elementLength + outerWallThickness * 2)) - 2) * i, 0]){
            model(directorLength);
            centreInsulator();
        }
    }
}

// ***************  Reflector Element  **********************************************************************************

if (createReflector == true){
    reflectorElementLength = elementLength * reflectorMultiplier;

    echo("Reflector Element Length:", reflectorElementLength, "mm");

    translate([-(reflectorElementLength + outerWallThickness * 2) - 2, (reflectorElementLength + outerWallThickness * 2) + 2 , 0]){
        mirror([0, 0, 0]) model(reflectorElementLength);
        mirror([0, 0, 0]) centreInsulator();
    }
}

// ***************  Hole in Driven Driven Element for Feed Line  ********************************************************

module hole(){
    rotate(a = 45, v = [0, 0, 1]){
        translate([-(hypotDiameter + 2 * hypotInsulator) / 2, -elementDiameter - .5, -(frameThickness) -1]){
            cube([hypotDiameter + 2 * hypotInsulator, (elementDiameter * 2) + 1, frameThickness + 2]);
        }
    }
}

difference(){
    model(elementLength);
    hole();
}

// ***************  Boom Tube  ******************************************************************************************

if (createBoomTube == true){

    boomSpacing = (elementLength * reflectorMultiplier) * 2;
    difference(){
        translate([-(boomSpacing + outerWallThickness * 2) - 2, (boomSpacing + outerWallThickness * 2) + 2 , 2]){
            boomTubeCutOut(boomCutoutDiameter * boomTubeCutoutScale - boomTubeDiameterOffset, boomTubeLength);
        }
        translate([-(boomSpacing + outerWallThickness * 2) - 2 + boomTubeWallThickness, (boomSpacing + outerWallThickness * 2) + 2 + boomTubeWallThickness, 2 + boomTubeRearWallThickness]){
            boomTubeCutOut(boomCutoutDiameter * boomTubeCutoutScale - boomTubeWallThickness * 2 - boomTubeDiameterOffset, boomTubeLength);
        }
        translate([-(boomSpacing + outerWallThickness * 2) - 2 + boomTubeWallThickness, (boomSpacing + outerWallThickness * 2) + 2 + boomTubeWallThickness, 1]){
            boomTubeRearHole(boomCutoutDiameter * boomTubeCutoutScale - boomTubeWallThickness * 2 - boomTubeDiameterOffset, boomTubeRearWallThickness + 2);
        }
    }
}

// ***************  Console Output for Element Spacing & Boom Tube Details  *********************************************

if (createBoomTube == true){
    echo("");
    echo("Boom Tube Diameter:", ((boomCutoutDiameter * boomTubeCutoutScale / 2) - (innerWallThickness) - (elementDiameter)) * 2 - boomTubeDiameterOffset, "mm");
    echo("Boom Tube Length: ", boomTubeLength, "mm");
}
echo("");
echo("Reflector Spacing:", reflectorSpacing, "mm");
echo("Director Spacing:", directorSpacing, "mm");
echo("");echo("");echo("");
```


[User]
I'm looking to create a customizable key tag model in OpenSCAD. I'd like the tag to be a rounded rectangle shape with a hole on one end for attaching to a keyring. The key tag should also have text on the surface of the tag. I'd like to be able to customize the text, text size, font, tag dimensions, and the diameter of the keyring hole. The tag should have a consistent thickness, but I should be able to specify how thick it is.

Could you generate the OpenSCAD code for this? I don't have any existing code. I'm expecting the response to be in the form of a single .scad file.

[Assistant]
key_tag.scad:
```
// This module creates a labeled tag for use with keys or luggage

// Text to write on tag
tag_text = "KEYS";

module key_tag(text) {
  font_size=10;
  $fn=100;
  hole_d=6;
  wall=2;
  thickness=2;
  difference() {
    hull() {
      translate([-7,0,0])
        cylinder(d=hole_d+2*wall,h=thickness);
      cylinder(d=font_size+3*wall,h=thickness);
      translate([ font_size*len(text)*0.8,0,0])
        cylinder(d=font_size+3*wall,h=thickness);
    }
    translate([-7,0,-1])
      cylinder(d=hole_d,h=5);
  }
  translate([0,0,2.5])
    linear_extrude(1.5)
      text(text, size=font_size, valign="center", halign="left", font="Mono");
}

key_tag(tag_text);

```


[User]
I'd like to create a customizable origami crab design using OpenSCAD. I want to be able to control the overall size of the crab, its height, and the thickness of both the outer and inner outlines. The original design uses a series of points to define the crab's shape and then creates inner cutouts.

Specifically, the parameters I need to control are:

*   **max_size_in_millimeter**: The maximum dimension of the crab. The other dimension should scale proportionally to maintain aspect ratio.
*   **model_height_in_millimeter**: The thickness of the extruded crab.
*   **outline_size_in_millimeter**:  The thickness of the outer edge of the crab.
*   **inline_size_in_millimeter**: The thickness of the inner cut lines.
*   **inline_edge_radius_in_millimeter**: How rounded the ends of the inner cut lines should be.
*   **flip_model**: A toggle to mirror the design along the vertical axis. Options are "yes" or "no".

The design is based on a set of fixed 2D coordinates (A1 through A16) that define the outer shape, and then sets of these points (C1 through C10) that define the inner cutouts. I'll provide the coordinate data. These points should be scaled according to the `max_size_in_millimeter` parameter and aspect ratio, just like in the original.

I'd like the final output to be a 3D model generated through linear extrusion. The inner outlines should create a cut-out effect. I don't want to use any libraries, just the standard OpenSCAD primitives.

The point coordinates are as follows:

```
A1 = [665, 99];
A2 = [728, 455];
A3 = [969, 440];
A4 = [1222, 457];
A5 = [1279, 89];
A6 = [1510, 474];
A7 = [1432, 948];
A8 = [1676, 1151];
A9 = [1598, 1551];
A10 = [1360, 1333];
A11 = [970, 1374];
A12 = [586, 1332];
A13 = [345, 1550];
A14 = [274, 1147];
A15 = [522, 937];
A16 = [431, 474];

outline = [A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16];

// Inner Points

// Polygons
C1 = [A16, A1, A2];
C2 = [A5, A6, A4];
C3 = [A16, A2, A3, A11];
C4 = [A16, A15, A12, A11];
C5 = [A15, A14, A12];
C6 = [A14, A13, A12];
C7 = [A3, A4, A6, A11];
C8 = [A6, A7, A10, A11];
C9 = [A7, A8, A10];
C10 = [A10, A9, A8];

cut_polygons = [C1, C2, C3, C4, C5, C6, C7, C8, C9, C10];
```

[Assistant]
customizable_origami_crab.scad:
```
/*
 * Customizable Origami - Crab - https://www.thingiverse.com/thing:2749619
 * by Dennis Hofmann - https://www.thingiverse.com/mightynozzle/about
 * created 2018-01-07
 * version v1.0
 *
 * Changelog
 * --------------
 * v1.0:
 *      - final design
 * --------------
 *
 * This work is licensed under the Creative Commons - Attribution - NonCommercial - ShareAlike license.
 * https://creativecommons.org/licenses/by-nc-sa/3.0/
 */

 // Parameter Section //
//-------------------//

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

// The maximum size of the longest side. The shorter side will be automatically resized in same ratio.
max_size_in_millimeter = 120; //[20:300]

// The height of the model.
model_height_in_millimeter = 5; //[0.2:0.2:100]

// Thickness of the outer outline.
outline_size_in_millimeter = 1.9; //[0.5:0.1:20]

// Thickness of the inner outline.
inline_size_in_millimeter = 0.9; //[0.5:0.1:20]

// Roundiness of the ends of the inner outlines.
inline_edge_radius_in_millimeter = 0.8; //[0.0:0.1:5]

// Flip model
flip_model = "no"; //[yes,no]

/*[hidden]*/
max_size = max_size_in_millimeter;
model_height = model_height_in_millimeter;
$fn=32;

// Outer Points
A1 = [665, 99];
A2 = [728, 455];
A3 = [969, 440];
A4 = [1222, 457];
A5 = [1279, 89];
A6 = [1510, 474];
A7 = [1432, 948];
A8 = [1676, 1151];
A9 = [1598, 1551];
A10 = [1360, 1333];
A11 = [970, 1374];
A12 = [586, 1332];
A13 = [345, 1550];
A14 = [274, 1147];
A15 = [522, 937];
A16 = [431, 474];

outline = [A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, A16];

// Inner Points

// Polygons
C1 = [A16, A1, A2];
C2 = [A5, A6, A4];
C3 = [A16, A2, A3, A11];
C4 = [A16, A15, A12, A11];
C5 = [A15, A14, A12];
C6 = [A14, A13, A12];
C7 = [A3, A4, A6, A11];
C8 = [A6, A7, A10, A11];
C9 = [A7, A8, A10];
C10 = [A10, A9, A8];

cut_polygons = [C1, C2, C3, C4, C5, C6, C7, C8, C9, C10];

min_x = A14[0];
min_y = A5[1];
max_x = A8[0];
max_y = A9[1];

x_size = max_x - min_x;
y_size = max_y - min_y;

x_factor = max_size / x_size;
y_factor = max_size / y_size;

inline_size = x_size > y_size ? inline_size_in_millimeter / x_factor / 2: inline_size_in_millimeter / y_factor / 2;
inline_edge_radius = x_size > y_size ? inline_edge_radius_in_millimeter / x_factor: inline_edge_radius_in_millimeter / y_factor;
outline_size = x_size > y_size ? outline_size_in_millimeter / x_factor - inline_size: outline_size_in_millimeter / y_factor - inline_size;

 // Program Section //
//-----------------//

if(x_size > y_size) {
    resize(newsize=[max_size, x_factor * y_size, model_height]){
        if(flip_model == "yes") {
            mirror([0,1,0]) {
                rotate([180,180,0]) {
                    create(outline, cut_polygons);
                }
            }
        } else {
            create(outline, cut_polygons);
        }
    }
} else {
    resize(newsize=[y_factor * x_size, max_size, model_height]){
        if(flip_model == "yes") {
            mirror([0,1,0]) {
                rotate([180,180,0]) {
                    create(outline, cut_polygons);
                }
            }
        } else {
            create(outline, cut_polygons);
        }
    }
}

 // Module Section //
//----------------//

module create() {
    linear_extrude(height=1) {
        difference() {
            offset(r = -0) {
                offset(r = +outline_size) {
                    polygon(points = outline, convexity = 10);
                }
            }

            for(cut_polygon = [0:len(cut_polygons)]) {
                offset(r = +inline_edge_radius) {
                    offset(r = -inline_size - inline_edge_radius) {
                        polygon(points = cut_polygons[cut_polygon], convexity = 10);
                    }
                }
            }
        }
    }
}

```


[User]
Okay, I need a parametric OpenSCAD design for a roller slider, specifically for use on aluminum extrusion, like 2020. I've been through a few designs and want something that's truly customizable based on the *actual* roller dimensions, not some arbitrary sizes.  I'm providing a detailed description below.

The slider will have a main body that fits over the extrusion rail. The critical part is that it holds the rollers, and the dimensions of the rollers are the primary variables. I need to specify the roller's *effective diameter* – this is the diameter of the roller that makes contact, excluding any part that sinks into the slot. I also need to specify the *inner diameter* of the roller, which will be the size of the screw that holds it in place. Finally, I need to specify the roller's *thickness*.  This thickness is how wide the roller is, which will influence the spacing of the support towers.

The slider should have mounting holes for attaching to other components. I want options for both a "long" pattern and a 20x20 pattern for these mounting holes, all using standard screws. It should have a tightening mechanism that allows for an adjustable snug fit against the extrusion rail.

Here's a more precise breakdown of the customizable parameters I need:

*   **`rail_w`**: Width of the rail (e.g., 20 for a 2020 extrusion). Default 20.
*   **`roller_h`**: Thickness or width of the roller. Default 11.
*   **`roller_d`**:  *Effective* diameter of the roller (contact diameter). Default 22.
*   **`roller_id`**: Inner diameter of the roller (screw size). Default 5.
*   **`roller_iod`**: Diameter of the top of the support tower for the roller.  Default 8.3.
*   **`thickness`**: Thickness of the slider's main plate. Default 7.
*   **`gap`**: Gap between the rail and the slider. Default 0.5.
*    **`play`**: Play on each side of the slider when not tightened. Default 0.1
*   **`nut_d`**: Diameter of the nuts used to mount carriage components. This needs to account for the nut having flat edges, so 5.4 / cos(30).
*   **`nut_h`**: Height of the nuts used to mount carriage components. Default 3.1.
*   **`screw_d`**: Diameter of the screws used. Default 3.
*   **`sink_flat`**: How far to sink the screw head. Default 1.5.
*   **`l`**: Overall length/height of the slider. Default 66.
*   **`arc_w`**: Width of the arc feature on the slider. Default 10.
*   **`rail_clearance`**: Distance between spacer tower and the extrusion. Default 1.5
*   **`tighten_travel`**: How far the tightening mechanism can travel. Default 4.5.
*   **`tab_w`**: Width of the tab used in the tightening mechanism. Default 6
*   **`screw_shell`**: Minimum shell around the screws. Default 6.

The design should:

*   Use a `difference()` operation for creating the overall shape with appropriate cutouts for rollers and screws.
*   Use `hull()` to combine the components of the roller support towers.
*   Have clear separation between screw holes and nut pockets.
*   Have mounting hole patterns, with both a "long" pattern and a "short" (e.g. 20x20) pattern using the defined `nut_d` and `screw_d`.
*   Include the tightening mechanism that provides an adjustable amount of squeeze on the extrusion rail.

I'd like to use a consistent `$fn` value for the cylinders that scales with the radius to make them smooth. This will need to be set up based on the radius of the circles being created to make sure the number of facets is reasonable.

I do not expect to use external libraries for this design.

[Assistant]
roller-slider.scad:
```
// The effective diameter of the roller, that is excluding that part that sinks into the slot (in mm)
roller_effective_diameter = 22;
// The roller inner diameter, which is supposed to coincide with the screw diameter (in mm)
roller_inner_diameter = 5;
// The roller thickness, so that we can center it on the rail (in mm)
roller_thickness = 11;

/* [Hidden] */
layer_height=.2; extrusion_width=.5;
epsilon=.01;

module roller_slider(
 rail_w=20,                     // rail width, that is 20 for 2020 extrusion
 roller_h = 11,                 // roller width
 roller_od = 24,                // roller outer diameter, irrelevant, actually
 roller_d = 22,                 // roller effective diameter
 roller_id = 5,                 // roller inner diameter (i.e. screw diameter)
 roller_iod = 8.3,              // roller inner ring diameter (the support tower top diameter)
 thickness = 7,                 // slider thickness
 gap = 0.5,                     // gap between the rail and the slider
 play = 0.1,                    // play on each side when not tightened
 nut_d = 5.4/cos(30),           // carriage mount screw dimensions
 nut_h = 3.1,
 screw_d = 3,
 sink_flat = 1.5,               // sink the big screw further this far
 l = 66,                        // slider length (height)
 arc_w = 10,                    // lever arc width
 rail_clearance=1.5,            // basically a distance between the spacer tower and the extrusion
 tighten_travel=4.5,            // how far can we travel for tightening
 tab_w=6,                       // lever tab width
 screw_shell=6                  // minimum shell around the screw
) {
 fnd=2*PI; fnr=2*fnd;
 long_pattern = [3.8*2,28.5*2];
 short_pattern = [20,20];
 sideways = rail_w/2 + roller_d/2 + play;
 base_d = roller_d-2*rail_clearance;
 roller_span = l-base_d;
 roller_z = thickness+rail_w/2-roller_h/2 + gap;
 arc_or = sideways+base_d/2-rail_w/2;
 tighten_y = max(base_d/2,short_pattern.y/2+nut_d/2)+screw_shell;
 module vitamins() {
  translate([-rail_w/2,-l/2-1,thickness+epsilon])
  cube(size=[rail_w,l+2,rail_w]);
 }//vitamins module
 module screwhole(what) {
  zr = 30;
  if(what=="out") {
   translate([0,0,-1])
   cylinder(d=screw_d,h=thickness+2,$fn=screw_d*fnd);
   translate([0,0,thickness-nut_h]) rotate([0,0,zr])
   cylinder(d=nut_d,h=nut_h+1,$fn=6);
  }else if(what=="in") {
   rotate([0,0,zr])
   cylinder(d=nut_d,h=thickness-nut_h,$fn=6);
  }
 }//screwhole module
 module screwpattern(pattern,what) {
  for(sx=[-1,1]) for(sy=[-1,1])
   translate([sx*pattern.x/2,sy*pattern.y/2,0]) screwhole(what=what);
 }//screwpattern module
 module screwpatterns(what) {
  screwpattern(pattern=long_pattern,what=what);
  screwpattern(pattern=short_pattern,what=what);
 }//screwpatterns module
 module rolltower(what) {
  if(what=="base")
   cylinder(d=base_d,h=thickness,$fn=base_d*fnd);
  else if(what=="in") {
    translate([0,0,thickness-epsilon])
    cylinder(d1=base_d,d2=roller_iod,h=roller_z-thickness+epsilon,$fn=base_d*fnd);
  }else if(what=="out") {
   translate([0,0,-1])
   cylinder(d=roller_id,h=roller_z+2,$fn=roller_id*fnd);
   translate([0,0,sink_flat])
   cylinder(d1=roller_id*2,d2=roller_id,h=roller_id/2,$fn=roller_id*2*fnd);
   translate([0,0,-epsilon])
   cylinder(d=roller_id*2,h=sink_flat+2*epsilon,$fn=roller_id*2*fnd);
  }else if(what=="baseout") {
   translate([0,0,-1])
   cylinder(d=base_d,h=thickness+2,$fn=base_d*fnd);
  }
 }//rolltower module

 % vitamins();
 difference() {
  union() {
   difference() {
    // base plate
    translate([-rail_w/2,-l/2,0])
    cube(size=[rail_w,l,thickness]);
    translate([+sideways-tighten_travel,0,0]) rolltower(what="baseout");
   }
   // screws
   screwpatterns(what="in");
   // tower base are belong to us
   for(my=[0,1]) mirror([0,my,0]) hull() {
    translate([-sideways,roller_span/2,0]) rolltower(what="base");
    basebase=l/2-short_pattern.y/2+nut_d/2+2*extrusion_width;
    translate([-rail_w/2,l/2-basebase,0]) cube(size=[rail_w/2,basebase,thickness]);
   }
   hull() {
    translate([rail_w/2+arc_or-arc_w,-l/2+arc_or-epsilon,0])
    cube(size=[arc_w,l/2-arc_or+epsilon,thickness]);
    translate([+sideways,             0,0]) rolltower(what="base");
   }
   // towering genii
   translate([-sideways,+roller_span/2,0]) rolltower(what="in");
   translate([+sideways,             0,0]) rolltower(what="in");
   translate([-sideways,-roller_span/2,0]) rolltower(what="in");
   // arc
   difference() {
    translate([rail_w/2,-l/2+arc_or,0])
    cylinder(r=arc_or,h=thickness,$fn=arc_or*fnr);
    translate([rail_w/2,-l/2+arc_or,-1])
    cylinder(r=arc_or-arc_w,h=thickness+2,$fn=arc_or*fnr);
    translate([rail_w/2-arc_or-1,-l/2+arc_or,-1])
    cube(size=[arc_or*2+2,arc_or+1,thickness+2]);
   }
   // tab
   translate([sideways+base_d/2-tab_w,-base_d/2,0])
   cube(size=[tab_w,base_d/2+tighten_y+screw_shell,thickness]);
   // tightener
   translate([rail_w/2-epsilon,tighten_y-screw_shell,0])
   cube(size=[sideways+base_d/2-tab_w-tighten_travel-rail_w/2+epsilon,screw_shell*2,thickness]);
  }//union
  // screw it!
  screwpatterns(what="out");
  // big roller screwholes
  translate([-sideways,+roller_span/2,0]) rolltower(what="out");
  translate([+sideways,             0,0]) rolltower(what="out");
  translate([-sideways,-roller_span/2,0]) rolltower(what="out");
  // tightener screwhole
  translate([0,tighten_y,thickness/2]) rotate([0,90,0])
  cylinder(d=screw_d,h=sideways+base_d/2+1,$fn=screw_d*fnd);
  // tightener nut pocke
  hull() for(z=[thickness/2,thickness+nut_d])
  translate([rail_w/2 + (sideways+base_d/2-tab_w-tighten_travel-rail_w/2)/2,tighten_y,z])
  rotate([0,90,0])
  cylinder(d=nut_d,h=nut_h,center=true,$fn=6);
 }//difference

}//roller_slider module

roller_slider(
 roller_d  = roller_effective_diameter,
 roller_id = roller_inner_diameter,
 roller_h  = roller_thickness
);

```