1 files changed, 29 insertions, 0 deletions

diff --git a/delta.jscad b/delta.jscad
index 326d172..35a777c 100644
--- a/delta.jscad
+++ b/delta.jscad
@@ -1,533 +1,562 @@
 var PRINT = {
  layer_height: 0.2,
  extrusion_width: 0.4,
 
  fit_tolerance: .2, slide_tolerance: .4, play_tolerance: .6, screw_tolerance: .3
 };
 
 var CONFIG = {
  extrusion: {
   w: 20, slotdepth: 6
  },
  base: {
           el: 240,      // side extrusion length
           sl: 240+2*70,         // triangle side length
           gap: 9        // vertical gap between side extrusions
  },
  column: {
           h: 600        // column height
  },
  heatbed: {
           r: 220/2,     // heatbed radius
           sr: 220/2-4.5,// radius of the screwholes circle
           h: 3+1.5      // thickness (including insulation)
  },
  glass: {
           r: 195/2,     // glass radius
           h: 3          // glass thickness
  },
  duet: {
   pcb_size: { x: 124, y: 100, z: 1 },
   hole_spacing: { x: 115, y: 92 },
   h: 30
  },
  foot: {
   d: 20*Math.sqrt(2), h: 30,
   bolt: { d:5, l: 19, hd: 10 },
   margin: 2.5,
   nut: { d: 8.6 /* TODO: */, h: 3.5 },
   shell: 4,
   zscalefactor: 1.6,
   foot: { ho: 2.5, hi: 5 }
  },
  duetholder: {
   bolt: { d: 3, l: 10, head: { d: 5.33, h: 3 } },
   margin: 3,
   s: 2.5
  },
  bedholder: {
   h: 15,
   margin: 3,
   nut: { w: 5.4, h: 2.5 },
   bolt: { d: 3, l: 10, head: { d: 5.33, h: 3 } }
  },
  hotend: {
           h: 62.4,              // full assembly height
           groove: { d:12, h:6 }, // grove diameter and height
   ungroove: { d:16, above:3.7, below: 3+4 }
  },
  effector: {
   h: 6,
           o: 20,// offset to the rod mounts line
   rods_apart: 40,
   cone: { shell: 1, angle: Math.PI/6 },
   rodend: {
            joint_w: 7,// thickness of the joint
    screw_l: 20-1, // 20 with the head
    screw_d: 3
   },
   hotend: { margin: 2 },
   hinge: {
    d: 3, w: 5, margin: 2.5,
    h: 1+(6+3.7)/2, // elevation + grove + top
    e: 1 // elevation
   },
   clamp: {
    shell: 4.6,
    d: 3,
    margin: 2.5,
    split: 0.6
   },
   mswitch: {
    size: [ 19.8, 6, 10 ],
    screw: {
     d: 2, h: 10/2-2,
     s: 1.3, // screw shell
     o: [-9.5/2,9.5/2].map(function(x) {
      return -19.8/2+x;
     })
    },
    switch_x: 2.5
   },
   guide: {
    width: 3, height: 5+1, length: 6
   },
   fanholder: {
    r: 30,
    screw: { d: 3, m: 2.5/*margin*/ },
    w: 3
   }
  },
  nut: { h: 2.3, w: 5.5 },
  color: {
   extrusion: [0.8, 0.8, 0.8, 0.8],
   pcb: [ 0, 0.3, 0.2, 0.8 ],
   bulk: [ .9, .9, .9, .2 ],
   parts: [ 0, 0.8, 0, 0.9 ],
   softparts: [ 0, 0, 0.8, 0.9 ],
   heatbed: [0.8, 0.8, 0.8, 0.8 ],
   glass: [0.9, 0.9, 0.9, 0.7 ]
  }
 };
 
 var CD = {
  base: (function(){
   var rv = {};
   rv.circumscription_r =
    CONFIG.base.sl/2/Math.cos(Math.PI/6);
   rv.outer_inscription_r =
    Math.sqrt(Math.pow(rv.circumscription_r,2)-
     Math.pow(CONFIG.base.sl/2,2));
   rv.mid_inscription_r =
     rv.outer_inscription_r-CONFIG.extrusion.w/2;
   rv.inner_inscription_r =
     rv.outer_inscription_r-CONFIG.extrusion.w;
   // TODO: properly calculate
   rv.column_r = rv.circumscription_r - 48.29;
   return rv;
  })(),
  duetholder: (function() {
   var rv = {};
   var s = CONFIG.base.sl;
   var l = CONFIG.duet.hole_spacing.x;
   var w = CONFIG.duet.hole_spacing.y;
   var h = s*Math.cos(Math.PI/6);
   var h1 = h*(1-l/s);
   rv.distance = (h1-w)/3; // hole to side
   return rv;
  })()
 };
 console.log(CONFIG); console.log(CD);
 
 var U = {
  hypotenuse: function(a,b) {
   return Math.sqrt(Math.pow(a,2)+Math.pow(b,2));
  },
  peek: function(x,m) {
   console.log(x,m);
   return x;
+ },
+ axes: function U_axes(o) {
+  if(!o) o = {};
+  var l = o.l||20, g = o.g||0.7;
+  return union([
+   CSG.roundedCylinder({start:[0,0,0],end:[l,0,0]}).setColor([1,0,0,g]),
+   CSG.roundedCylinder({start:[0,0,0],end:[0,l,0]}).setColor([0,1,0,g]),
+   CSG.roundedCylinder({start:[0,0,0],end:[0,0,l]}).setColor([0,0,1,g])
+  ]);
+ },
+ pextract: function U_pextract(a,pn) { // TODO: monkeypatch Array
+  return a.map(function(x){return x[pn]});
+ },
+ hole: function U_hole(o) {
+  var r = o.r||o.radius||(o.d/2)||(o.diameter/2);
+  var n = Math.max(Math.round(4*r),4);
+  return CSG.cylinder({
+   start: o.start, end: o.end,
+   radius: r/Math.cos(Math.PI/n),
+   resultion: n
+  });
+ },
+
+ upright: function U_upright() { return new CSG.Connector([0,0,0],[0,0,1],[1,0,0]) },
+ downright: function U_downright() { return new CSG.Connector([0,0,0],[0,0,-1],[1,0,0]) },
+ P: function U_P(x) {
+  if(!x.properties.P) return x;
+  return x.connectTo(x.properties.P,U.upright(),false,0);
  }
+ 
 };
 
 /* {h:,w:} */
 function nut(o) {
  var rv = CSG.cylinder({
   start:[0,0,0],end:[0,0,o.h],
   radius: o.w/2/Math.cos(Math.PI/6),
   resolution: 6
  });
  rv.properties.axis_connector = new CSG.Connector([0,0,0],[0,0,1],[0,1,0]);
  return rv;
 }
 
 var E3DV6 = {
  dimensions: {
   big_d: 22.3,
 
  },
  heatsink: function() {
   var fn = 16;
   var z=0;
   var unite = [ {d:16,h:3.7},{d:12,h:6},{d:16,h:3} ].map(function(x) {
    return CSG.cylinder({
     start: [0,0,z], end: [0,0,z-=x.h],
     radius: x.d/2, resolution: fn
    });
   });
   unite.push(CSG.cylinder({
    start:[0,0,z-=1.5], end:[0,0,z-=1],
    radius: 16/2, resolution: fn
   }));
   for(var i=0;i<11;++i) unite.push(CSG.cylinder({
    start:[0,0,z-=1.5], end:[0,0,z-=1],
    radius: this.dimensions.big_d/2, resolution: fn
   }));
   unite.push(CSG.cylinder({
    start:[0,0,z], end: [0,0,-12.7],
    radiusStart: 10/2, radiusEnd: 8.5/2, /* pretty arbitrary */
    resolution: fn
   }));
   var rv = union(unite);
   rv = rv.subtract([CSG.cylinder({
    start:[0,0,1], end: [0,0,z-1],
    radius: 4.2/2, resolution: fn
   }),CSG.cylinder({
    start:[0,0,1], end: [0,0,-6.7/*somewhat arbitrary*/],
    radius: 8/2, resolution: fn
   }),CSG.cylinder({
    start:[0,0,z-1], end: [0,0,z+14.8],
    radius: 6/2 /*M7*/, resolution: fn
   })]);
   rv.properties.pushfit_connector = new CSG.Connector([0,0,0],[0,0,-1],[1,0,0]);
   rv.properties.heatbreak_connector = new CSG.Connector([0,0,z+14.8],[0,0,-1],[1,0,0]);
   rv.properties.grove_connector = new CSG.Connector([0,0,-3.7-3],[0,0,1],[1,0,0]);
   return rv.setColor([0.8,0.8,0.8,0.9]);
  }
 };
 
 var EFFECTOR = {
  /* {sd: screw diameter, l: cone length, s: screw shell, a: angle from axis} */
  cone: function effector_cone(o) {
   var re = o.sd/2+o.s, rs = re+o.l*Math.tan(o.a||(Math.PI/4));
   var rv = CSG.cylinder({
    start: [0,0,0], end: [0,0,o.l],
    radiusStart: rs, radiusEnd: re,
    resolution: Math.floor(rs*2*2)
   }).subtract(CSG.cylinder({
    start:[0,0,-1], end:[0,0,o.l+1], radius: o.sd,
    //resolution: Math.floor(o.sd*2*2)
   }));
   rv.properties.top_connector = new CSG.Connector([0,0,o.l],[0,0,-1],[1,0,0]);
   rv.properties.bottom_connector = new CSG.Connector([0,0,0],[0,0,1],[1,0,0]);
   var nuthole = nut(CONFIG.nut);
   rv = rv.subtract(nuthole.connectTo(
    nuthole.properties.axis_connector, rv.properties.bottom_connector,
    false, 0
   ));
   return rv.intersect(CSG.cylinder({start:[0,0,0],end:[0,0,o.l],radius:6/*TODO:calculate*/}));
  },
  platform_bb: function platform_bb() {
   var e = CONFIG.effector;
   var r = U.hypotenuse(e.rods_apart/2,e.o+e.rodend.screw_d/2+e.cone.shell);
   var rv = CSG.sphere({
    center: [0,0,e.h/2], radius: r,
    resolution: r*2*2
   }).intersect(CSG.cube({
    corner1: [-r,-r,0], corner2: [r,r,e.h]
   }));
   rv.properties.base_connector = new CSG.Connector([0,0,0],[0,0,1],[1,0,0]);
   return rv;
  },
  effector: function effector_effector() {
   var e = CONFIG.effector;
   var conel = e.rodend.screw_l-e.rodend.joint_w;
   var nutr = CONFIG.nut.w/2/Math.cos(Math.PI/6);
   var cone = this.cone({sd:e.rodend.screw_d/2,l:conel,s:e.cone.shell,a:e.cone.angle});
   var rcorner = U.hypotenuse(e.o-e.rodend.screw_d/2-e.cone.shell,e.rods_apart/2)-3.85; //XXX:config/calc
   var ropen = E3DV6.dimensions.big_d/2+e.hotend.margin;
   var rmount = this.rmount = (rcorner+ropen)/2;
   var rv = [];
   for(var a=0;a<360;a+=120) {
    rv.push(union([-1,1].map(function(s) {
     return cone.connectTo(cone.properties.top_connector,
      new CSG.Connector([s*e.rods_apart/2,e.o,e.h/2],[-s,0,0],[0,0,1]),
      false, 0);
    })).union(CSG.cube({
     corner1:[e.rods_apart/2-conel+.1,e.o-nutr,0],
     corner2:[-e.rods_apart/2+conel-.1,
      -rcorner,
      e.h]
    })).rotateZ(a));
   }
   rv.push(CSG.cylinder({
    start:[0,0,0], end:[0,0,e.h],
    radius: U.hypotenuse(e.o-nutr,e.rods_apart/2-conel)
   }));
   rv = union(rv).intersect(this.platform_bb()).subtract(CSG.cylinder({
    start:[0,0,-1], end:[0,0,e.h+1],
    radius: ropen, resolution: ropen*4
   })).subtract([/*0, probe here*/120,240].map(function(x) { /* nut pockets */
    return CSG.cube({
     corner1:[-CONFIG.nut.w/2,0,(e.h-CONFIG.nut.h)/2],
     corner2:[CONFIG.nut.w/2,-rcorner-1,(e.h+CONFIG.nut.h)/2]
    }).union(CSG.cylinder({
     start:[0,-rmount,-1], end:[0,-rmount,e.h+1],
     radius: 3/2 // XXX:
    })).subtract(CSG.cylinder({
     start:[0,-rmount,(e.h+CONFIG.nut.h)/2],
     end:[0,-rmount,(e.h+CONFIG.nut.h)/2+PRINT.layer_height*3/2],
     radius: 3/2+.1
    })).rotateZ(x);
   })).subtract( CSG.cylinder({ // pulldown screw
    start: [0,-rcorner+e.mswitch.size[1]+PRINT.extrusion_width+3/2/*XXX:conf*/,-1],
    end: [0,-rcorner+e.mswitch.size[1]+PRINT.extrusion_width+3/2/*XXX:conf*/,e.h+1],
    radius: 3/2+1 /*XXX: config */
   })).subtract( CSG.cylinder({ /* switch-screw */
    start: [e.mswitch.switch_x,-rcorner+e.mswitch.size[1]/2,-1],
    end: [e.mswitch.switch_x,-rcorner+e.mswitch.size[1]/2,e.h+1],
    radius: e.mswitch.screw.d/2
   }));
   // add hinges
   rv.properties.hinge_connector=new CSG.Properties();
   var hinges_apart=e.rods_apart/2-conel;
   rv = rv.union([-1,1].map(function hinge(s) {
    rv.properties.hinge_connector[s]=new CSG.Connector([s*hinges_apart,e.o,e.h+e.hinge.h],[s,0,0],[0,0,1]);
    return CSG.cube({
     corner1: [s*hinges_apart,e.o-e.hinge.margin-e.hinge.d/2,e.h],
     corner2: [s*(hinges_apart+e.hinge.w),e.o+e.hinge.margin+e.hinge.d/2,e.h+e.hinge.h]
    }).union(CSG.cylinder({
     start: [s*hinges_apart,e.o,e.h+e.hinge.h],
     end: [s*(hinges_apart+e.hinge.w),e.o,e.h+e.hinge.h],
     radius: e.hinge.d/2+e.hinge.margin
    })).subtract(CSG.cylinder({
     start: [s*(hinges_apart-1),e.o,e.h+e.hinge.h],
     end: [s*(hinges_apart+e.hinge.w+1),e.o,e.h+e.hinge.h],
     radius: e.hinge.d/2
    }));
   }));
   // add clamp guides
   var cgrr = e.guide.width/3;
   rv = rv.union([-1,1].map(function guide(s) {
    return CSG.roundedCube({
     center: [s*(e.mswitch.size[0]+PRINT.slide_tolerance+e.guide.width)/2,-rcorner+e.guide.length/2,e.h+e.guide.height/2-cgrr],
     radius: [e.guide.width/2,e.guide.length/2,e.guide.height/2+cgrr],
     roundradius: cgrr
    }).intersect(CSG.cube({
      center: [s*(e.mswitch.size[0]+PRINT.slide_tolerance+e.guide.width)/2,-rcorner+e.guide.length/2,e.h+e.guide.height/2],
      radius: [e.guide.width/2,e.guide.length/2,e.guide.height/2+.1],
      roundradius: cgrr
    }));
   }));
   rv.properties.grove_connector = new CSG.Connector([0,0,e.h+e.hinge.e+6/2],[0,0,1],[1,0,0]);
   rv.properties.rcorner = rcorner;
   return rv.setColor([0.4,0.8,0.4,0.9]);
  },
  hinged: function effector_hinged(o) {
   var e = CONFIG.effector;
   var conel = e.rodend.screw_l-e.rodend.joint_w;
   var hinges_apart = e.rods_apart/2-conel;
   var hhr = e.o-e.hinge.d/2-e.hinge.margin; // hotend holder radius
   var hhh = CONFIG.hotend.groove.h+CONFIG.hotend.ungroove.above;
   var rv = CSG.cylinder({ /* hinge */
    start: [-hinges_apart+PRINT.slide_tolerance,e.o,e.h+e.hinge.h],
    end: [hinges_apart-PRINT.slide_tolerance,e.o,e.h+e.hinge.h],
    radius: e.hinge.d/2+e.hinge.margin
   }).union( /* lower hotend holder */
    CSG.cylinder({
     start: [0,0,e.h+e.hinge.e], end: [0,0,e.h+e.hinge.e+CONFIG.hotend.groove.h],
     radius: hhr
    }).subtract(CSG.cylinder({
     start: [0,0,e.h+e.hinge.e-1], end: [0,0,e.h+e.hinge.e+CONFIG.hotend.groove.h+1],
     radius: CONFIG.hotend.groove.d/2 +PRINT.fit_tolerance
    }))
   ).union( /* upper hotend holder */
    CSG.cylinder({
     start: [0,0,e.h+e.hinge.e+CONFIG.hotend.groove.h],
     end: [0,0,e.h+e.hinge.e+CONFIG.hotend.groove.h+CONFIG.hotend.ungroove.above],
     radius: hhr
    }).subtract(CSG.cylinder({
     start: [0,0,e.h+e.hinge.e+CONFIG.hotend.groove.h-1],
     end: [0,0,e.h+e.hinge.e+CONFIG.hotend.groove.h+CONFIG.hotend.ungroove.above+1],
     radius: CONFIG.hotend.ungroove.d/2 +PRINT.fit_tolerance
    }))
   ).union( /* connect mount with hinge */
    CSG.cube({
     corner1: [-hinges_apart+PRINT.slide_tolerance,CONFIG.hotend.ungroove.d/2+PRINT.fit_tolerance,e.h+e.hinge.e],
     corner2: [hinges_apart-PRINT.slide_tolerance,e.o,e.h+e.hinge.h+e.hinge.d/2+e.hinge.margin]
    })
   ).subtract( /* hinge screwhole */
    CSG.cylinder({
     start: [-hinges_apart-1,e.o,e.h+e.hinge.h],
     end: [hinges_apart+1,e.o,e.h+e.hinge.h],
     radius: e.hinge.d/2
    })
   ).union( /* hold clamp together */
    [-1,1].map(function(s) {
     return CSG.roundedCube({
      corner1: [s*(-hhr-e.clamp.margin*2-e.clamp.d),-e.clamp.shell,e.h+e.hinge.e],
      corner2: [s*(-CONFIG.hotend.ungroove.d/2-PRINT.fit_tolerance),+e.clamp.shell,e.h+e.hinge.e+hhh],
      roundradius: 1.5
     });
    })
   ).subtract( /* screws for holding clamp */
    [-1,1].map(function(s) {
     var nuthole = nut(CONFIG.nut);
     var x = s*(-hhr-e.clamp.margin-e.clamp.d/2);
     return CSG.cylinder({
      start: [x,-e.clamp.shell-1,e.h+e.hinge.e+hhh/2],
      end: [x,e.clamp.shell+1,e.h+e.hinge.e+hhh/2],
      radius: e.clamp.d/2
     }).union(nuthole.connectTo(
      nuthole.properties.axis_connector,
      new CSG.Connector([x,e.clamp.shell,e.h+e.hinge.e+hhh/2],[0,-1,0],[0,0,1]),
      false, 0
     )).union(CSG.cylinder({
      start: [x,-e.clamp.shell-1,e.h+e.hinge.e+hhh/2],
      end: [x,0,e.h+e.hinge.e+hhh/2],
      radius: e.clamp.d/2+PRINT.slide_tolerance
     }));
    })
   );
   var ms = o.microswitch;
   var msedge = o.effector.properties.rcorner;
   var msh = 9.5; // microswitch holes apart
   var mshh = Math.abs(ms.properties.switch_connector.point.z-ms.properties.screw_connector[0].point.z); // microswitch holes height
   rv = rv.union(CSG.cube({ // connect clamp with microswitch
    corner1: [-ms.properties.microswitch.size.x/2,-msedge+.1,e.h+e.hinge.e],
    corner2: [+ms.properties.microswitch.size.x/2,-CONFIG.hotend.ungroove.d/2-PRINT.fit_tolerance,e.h+e.hinge.e+hhh]
   })).union([-msh/2,msh/2].map(function(x) { // shell for microswitch screws
     return CSG.roundedCylinder({
      start: [x,-CONFIG.hotend.ungroove.d/2-PRINT.fit_tolerance-(e.mswitch.screw.d/2+e.mswitch.screw.s),e.h+e.hinge.e+mshh],
      end: [x,-msedge+ms.properties.microswitch.size.y,e.h+e.hinge.e+mshh],
      radius: e.mswitch.screw.d/2+e.mswitch.screw.s
     });
   })).subtract(CSG.cube({ // cut off excess if any
    corner1:[-hhr,-msedge+ms.properties.microswitch.size.y,e.h+e.hinge.e-1],
    corner2:[hhr,-msedge-1,e.h+e.hinge.e+hhh+e.mswitch.screw.d+e.mswitch.screw.s+1]
   })).subtract([-msh/2,msh/2].map(function(x) { return CSG.roundedCylinder({ // screwholes
    start: [x,-CONFIG.hotend.ungroove.d/2-PRINT.fit_tolerance-(e.mswitch.screw.d/2+e.mswitch.screw.s),e.h+e.hinge.e+mshh],
    end: [x,-msedge+ms.properties.microswitch.size.y,e.h+e.hinge.e+mshh],
    radius: e.mswitch.screw.d/2
   })})).subtract(CSG.cylinder({ // pulldown screw
    start:[0,-msedge+ms.properties.microswitch.size.y+3/2/*XXX:config*/+PRINT.extrusion_width,e.h+e.hinge.e-1],
    end:[0,-msedge+ms.properties.microswitch.size.y+3/2/*XXX:config*/+PRINT.extrusion_width,e.h+e.hinge.e+hhh+1],
    radius: 3/2/*XXX:config*/
   }));
   rv.properties.microswitch_screw_connector = new CSG.Properties();
   [-msh/2,msh/2].forEach(function(x,i) {
    rv.properties.microswitch_screw_connector[i] = new CSG.Connector(
     [x,-msedge,e.h+e.hinge.e+mshh],
     [0,1,0], [0,0,-1]
    );
   });
   return rv.setColor([0.3,0.8,0.3,0.9]);
  },
  split_hinged: function effector_split_hinged(hinged) {
   var e = CONFIG.effector;
   var b = hinged.getBounds();
   var ymax = Math.max(Math.abs(b[0].y),Math.abs(b[1].y));
   var zmax = Math.max(b[0].z,b[1].z);
   return [-1,1].map(function(s) {
    return hinged.intersect(CSG.cube({
     corner1: [Math.min(b[0].x,b[1].x)-1,s*e.clamp.split/2,-zmax-1],
     corner2: [Math.max(b[0].x,b[1].x)+1,s*(ymax+1),zmax+1]
    }));
   });
  },
  fanholder: function effector_fanholder() {
   var fh = CONFIG.effector.fanholder;
   var od = fh.screw.d+2*fh.screw.m;
   return linear_extrude({height:fh.w},hull(
    CAG.circle({center:[0,-this.rmount],radius:od/2}),
    CAG.circle({center:[0,-fh.r+od/2+fh.w/2],radius:fh.w/2})
   )).translate([0,0,-fh.w]).union(
    linear_extrude({height:fh.w},hull(
     CAG.circle({center:[fh.w/2,-this.rmount-od/2-fh.w/2],radius:fh.w/2}),
     CAG.circle({center:[od/2,-fh.r],radius:od/2})
    )).rotateY(90).translate([-fh.w/2,0,0])
   ).subtract( CSG.cylinder({
    start: [-fh.w,-fh.r,-od/2],
    end: [fh.w,-fh.r,-od/2],
    radius: fh.screw.d/2
   })).subtract( CSG.cylinder({
    start: [0,-this.rmount,1],
    end: [0,-this.rmount,-fh.w-1],
    radius: fh.screw.d/2
   })).setColor([0.3,0.8,0.3,0.9]).rotateZ(-120);
  }
 };
 
 function columns() {
  var rv = [0,1,2].map(function(x) {
   return union(vector_char(0,0,String.fromCharCode('A'.charCodeAt(0)+x)).segments.map(function(x) {
    return rectangular_extrude(x,{w:2,h:1});
   })).center().rotateX(90).translate([0,50,0]).rotateZ(x*120+120);
  });
  return union(rv);
 }
 
 function microswitch() {
  var screw_connector = new CSG.Properties();
  var rv = CSG.cube({ center:[0,0,2.5],radius: [19.8/2,6/2,10/2] }).union(
   CSG.cube({ center: [2.5,0.5,6], radius: [2/2,3.5/2,5/2] })
  ).union(
   [-8,-1,8].map(function(x) {
    return CSG.cube({ center:[x,0,0], radius: [0.6/2,3.2/2,13/2] })
   })
  ).subtract(
   [-9.5/2,9.5/2].map(function(x,i) {
    screw_connector[i] = new CSG.Connector([x,6/2,0],[0,-1,0],[0,0,1]);
    return CSG.cylinder({
     start: [x,-4,0], end: [x,4,0],
     radius: 2/2
    })
   })
  );
  rv.properties.switch_connector = new CSG.Connector([2.5,0.5,6+5/2],[0,0,1],[0,-1,0]);
  rv.properties.screw_connector = screw_connector;
  rv.properties.microswitch = new CSG.Properties();
  rv.properties.microswitch.size = new CSG.Vector3D(
   19.8,6,10
  );
  return rv;
 }
 
 var FOURWINDS = [0,90,180,270];
 
 var E2020 = {
  outer: 20, thickness: 1.8,
  roundius: 1, centerhole: 5,
  slot_width: 6,
  T: { width: 10, thickness: 1.5, depth: 6.5 },
 
  extrusion: function(o) {
   if(!o) o = {};
   var e = o.extrusion || this;
   var l = o.l||5;
   var iy = e.outer/2-e.T.depth;
   var ix = e.T.width/2-(e.outer/2-iy-e.thickness-e.T.thickness);
   var rv = CAG.roundedRectangle({
    corner1: [-e.outer/2,-e.outer/2], corner2: [e.outer/2,e.outer/2],
    roundradius: e.roundius
   }).subtract(
    FOURWINDS.map(function(w) {
     return CAG.fromPoints([
      [  e.slot_width/2,e.outer/2+1],
      [  e.slot_width/2,e.outer/2-e.thickness],
      [  e.T.width/2,e.outer/2-e.thickness],
      [  e.T.width/2,e.outer/2-e.thickness-e.T.thickness],
      [  ix, iy ],
      [ -ix, iy ],
      [ -e.T.width/2,e.outer/2-e.thickness-e.T.thickness],
      [ -e.T.width/2,e.outer/2-e.thickness],
      [ -e.slot_width/2,e.outer/2-e.thickness],
      [ -e.slot_width/2,e.outer/2+1],
     ]).rotateZ(w);
    })
   ).subtract(CAG.circle({
    center: [0,0], radius: e.centerhole/2
   })).extrude({offset:[0,0,l]});
   rv.properties.c_top=rv.properties.c_left
    = new CSG.Connector([0,0,l],[0,0,-1],[1,0,0]);
   rv.properties.c_bottom=rv.properties.c_right
    = new CSG.Connector([0,0,0],[0,0,1],[1,0,0]);