.gitignore

@@ -1,2 +1 @@
 stls/
-private

c3cat-bottle-clip/c3cat-bottle-clip.scad

@@ -26,16 +26,6 @@
  */
 
 include <write/Write.scad>
-use <catear_headband.scad>
-
-$fn = 360;
-
-NAME = "c3cat";
-LOGO_FILE = ""; // empty string is catear model
-RENDER_COLOR_ONE = true;
-RENDER_COLOR_TWO = true;
-RENDER_COLOR_THREE = true;
-USE_TINY_EARS = true;
 
 /**
  * Creates one instance of a bottle clip name tag. The default values are
@@ -54,58 +44,32 @@ USE_TINY_EARS = true;
  * font: the path to a font for Write.scad.
  */
 
-/**
+/* currently openscad fails to render `Ohren_4.stl` outside of the preview mode */
- * currently openscad fails to render the original `Ohren_4.stl` outside of the preview mode
+//difference() {
- * according to [the wiki](https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/FAQ#Why_is_my_imported_STL_file_appearing_with_F5_but_not_F6?) this is the stls fault
+  rotate(45, [0, 0, 1]) bottle_clip(name="c3cat");
- * using meshlab to run `Filters` -> `Cleaning and Repairing` -> `Remove T-Vertices` by `Edge-Flip` with `Ratio` of `1000000` before importing the stl works but but two errors remain.
+//  translate([ 15, 0, 18]) rotate(80, [0, 1, 0]) catear();
- */
+//  translate([-15, 0, 18]) rotate(-80, [0, 1, 0]) catear();
-scale([0.2, 0.2, 0.2]) {
+//}
+//
+//translate([0,  5, 0]) catear();
+//rotate(180) translate([0,  5, 0]) catear();
+
+module bottle_clip(ru=13, rl=17.5, ht=26, width=2.5, name="c3cat", font="write/orbitron.dxf", logo="") {
+
+	e=100;  // should be big enough, used for the outer boundary of the text/logo
+
   difference() {
-    scale([5, 5, 5]) rotate(45, [0, 0, 1]) bottle_clip(name=NAME);
+    rotate([0,0,-45]) union() {
-    translate([ 15*5, 0*5, 18*5]) rotate(80, [0, 1, 0]) catear();
+      // main cylinder
-    translate([-15*5, 0*5, 18*5]) rotate(-80, [0, 1, 0]) catear();
+      cylinder(r1=rl+width, r2=ru+width, h=ht);
-  }
+      // text and logo
-
-  translate([0,  5*5, 0]) catear();
-  rotate(180) translate([0,  5*5, 0]) catear();
-}
-
-module name(name, font, rl, ht, ru) {
-  writecylinder(
-    text=name,
-    where=[0,0,0],
-    radius=rl+0.5,
-    height=ht/13*7,
-    h=ht/13*4,
-    t=max(rl,ru),
-    font=font);
-}
-
-module logo(logo, rl, ht, ru, width) {
-  echo("logo: ", logo);
       if(logo == "") {
-    ear_size=ht;
+        color("orange") writecylinder(name, [0,0,0], rl+0.5, ht/13*7, h=ht/13*4, t=max(rl,ru), font=font);
-    echo("ht: ", ht);
+        translate([4.7, -rl, ht*1.08]) rotate(-10, [1, 0, 0]) rotate(76, [0, 1, 0]) scale([0.08, 2, 0.08]) color("red") import("catears.stl");
-    echo("ru: ", ru);
-    echo("rl: ", rl);
-    echo("width: ", width);
-    translate([0,-max(ru,rl),ht*3/4+.5])
-      rotate([90,0,0])
-        scale([1,1,1])
-          scale([ht/100,ht/100,1])
-            translate([0, -ht/2,0])
-              rotate(-90, [0, 0, 1])
-                catear_headband(
-                  size=ear_size,
-                  height=max(ru,rl),
-                  thickness=width,
-                  stretch_len=0,
-                  tip_len=0,
-                  details=false,
-                  with_rake=false
-                );
       } else {
-        // The logo has been split in 3 parts. // well was... TODO
+        color("orange") writecylinder(name, [0,0,0], rl+0.5, ht/13*7, h=ht/13*4, t=max(rl,ru), font=font);
+
+        // The logo has been split in 3 parts.
 /*
         rotate([0,0,-48]) translate([0,0,ht*3/4-0.1])
           rotate([90,0,0])
@@ -133,32 +97,6 @@ module logo(logo, rl, ht, ru, width) {
 */
       }
     }
-
-module bottle_clip(ru=13, rl=17.5, ht=26, width=2.5, name="c3cat", font="write/orbitron.dxf", logo="") {
-
-	e=100;  // should be big enough, used for the outer boundary of the text/logo
-
-  difference() {
-    rotate([0,0,-45]) union() {
-      // main cylinder
-      if (RENDER_COLOR_ONE) {
-        color("black")
-          difference() {
-            cylinder(r1=rl+width, r2=ru+width, h=ht);
-            name(name=name, font=font, rl=rl, ht=ht, ru=ru);
-            logo(logo=logo, rl=rl, ht=ht, ru=ru, width=width);
-          }
-      }
-      // text
-      if (RENDER_COLOR_TWO) {
-        color("orange")
-          name(name=name, font=font, rl=rl, ht=ht, ru=ru);
-      }
-      // logo
-      if (RENDER_COLOR_THREE) {
-        color("yellow") logo(logo=logo, rl=rl, ht=ht, ru=ru, width=2*width);
-      }
-    }
     // inner cylinder which is substracted
     translate([0,0,-1])
       cylinder(r1=rl, r2=ru, h=ht+2);
@@ -177,11 +115,9 @@ module bottle_clip(ru=13, rl=17.5, ht=26, width=2.5, name="c3cat", font="write/o
 }
 
 module catear() {
-  if (USE_TINY_EARS) {
   rotate(-90, [0, 0, 1]) union() {
-      scale([1,  1 ,1]) translate([0, -85]) import("catear.stl");
+    scale([0.2,  0.2, 0.2]) translate([0, -85]) import("catear.stl");
-      scale([1, -1, 1]) translate([0, -85]) import("catear.stl");
+    scale([0.2, -0.2, 0.2]) translate([0, -85]) import("catear.stl");
-    }
   }
 }
 

c3cat-bottle-clip/catear_headband.scad

@@ -1 +0,0 @@
-../catear_headband.scad

catear_headband.scad

@@ -1,9 +1,8 @@
-include <globals.scad>;
+include <headband.scad>
 
-use <headband.scad>;
+use <headband.scad>
-use <chamfer.scad>;
 
-module catear(height, thickness, fractal=0, side_len=30, bend_factor=0.5, stretch_factor=1.2, debug=false, chamfer=CHAMFER, chamfer_shape=CHAMFER_SHAPE, details=true) {
+module catear(height, thickness, fractal=0, side_len=30, bend_factor=0.5, stretch_factor=1.2, debug=false, chamfer=CHAMFER, chamfer_shape=CHAMFER_SHAPE) {
   $A=[0, side_len/2];
   $B=[0,-side_len/2];
   $C=[-(side_len/2/sin(120))*1.5*stretch_factor, 0];
@@ -23,7 +22,7 @@ module catear(height, thickness, fractal=0, side_len=30, bend_factor=0.5, stretc
       translate([0, $a/2, 0])
         translate([$bend_offset, 0, 0])
           color("#00ffff")
-            chamfer(size=(details)?chamfer:0, child_h=height, child_bot=-height/2, shape=chamfer_shape)
+            chamfer(size=chamfer, child_h=height, child_bot=-height/2, shape=chamfer_shape)
               partial_ring(
                 part=$delta/360,
                 radius=$bend_radius,
@@ -35,19 +34,15 @@ module catear(height, thickness, fractal=0, side_len=30, bend_factor=0.5, stretc
       translate([0, -$b/2, 0])
         translate([$bend_offset, 0, 0])
           color("#ff00ff")
-            chamfer(size=(details)?chamfer:0, child_h=height, child_bot=-height/2, shape=chamfer_shape)
+            chamfer(size=chamfer, child_h=height, child_bot=-height/2, shape=chamfer_shape)
               partial_ring(
                 part=$delta/360,
                 radius=$bend_radius,
                 thickness=thickness,
                 height=height
               );
-  translate($A) color("#aaaaaa")
+  translate($A) color("#aaaaaa") cylinder(h=height, d=thickness, center=true);
-    chamfer(size=chamfer, child_h=height, child_bot=-height/2, shape=chamfer_shape)
+  translate($B) color("#bbbbbb") cylinder(h=height, d=thickness, center=true);
-      cylinder(h=height, d=thickness, center=true);
-  translate($B) color("#bbbbbb")
-    chamfer(size=chamfer, child_h=height, child_bot=-height/2, shape=chamfer_shape)
-      cylinder(h=height, d=thickness, center=true);
   translate($C) color("#cccccc")
     chamfer(size=chamfer, child_h=height, child_bot=-height/2, shape=chamfer_shape)
       cylinder(h=height, d=thickness, center=true);
@@ -74,7 +69,7 @@ module catear(height, thickness, fractal=0, side_len=30, bend_factor=0.5, stretc
   }
 }
 
-module catear_headband(debug=DEBUG, size=SIZE, height=HEIGHT, thickness=THICKNESS, part=PART, stretch_len=STRETCH_LEN, tip_len=TIP_LEN, tip_bend=TIP_BEND, ear_scale=1.5, ear_bend_factor=0.15, ear_stretch_factor=1.2, ear_angle=42, chamfer=CHAMFER, chamfer_shape=CHAMFER_SHAPE, with_rake=true, details=true) {
+module catear_headband(debug=DEBUG, size=SIZE, height=HEIGHT, thickness=THICKNESS, part=PART, stretch_len=STRETCH_LEN, tip_len=TIP_LEN, tip_bend=TIP_BEND, ear_scale=1.5, ear_bend_factor=0.15, ear_stretch_factor=1.2, ear_angle=42, chamfer=CHAMFER, chamfer_shape=CHAMFER_SHAPE) {
 
   $a=size/2*ear_scale;
   $delta=2*(acos($a/(size*2))-90);
@@ -90,8 +85,7 @@ module catear_headband(debug=DEBUG, size=SIZE, height=HEIGHT, thickness=THICKNES
         bend_factor=ear_bend_factor,
         stretch_factor=ear_stretch_factor,
         chamfer=chamfer,
-        chamfer_shape=chamfer_shape,
+        chamfer_shape=chamfer_shape
-        details=details
       );
     }
     rotate(-ear_angle, [0, 0, 1]) {
@@ -103,8 +97,7 @@ module catear_headband(debug=DEBUG, size=SIZE, height=HEIGHT, thickness=THICKNES
         bend_factor=ear_bend_factor,
         stretch_factor=ear_stretch_factor,
         chamfer=chamfer,
-        chamfer_shape=chamfer_shape,
+        chamfer_shape=chamfer_shape
-        details=details
       );
     }
     headband(
@@ -114,9 +107,7 @@ module catear_headband(debug=DEBUG, size=SIZE, height=HEIGHT, thickness=THICKNES
       part=part,
       stretch_len=stretch_len,
       tip_len=tip_len,
-      tip_bend=tip_bend,
+      tip_bend=tip_bend
-      with_rake=with_rake,
-      details=details
     );
   };
 }

catear_pedestal.scad

@@ -1,49 +0,0 @@
-include <globals.scad>
-
-use <catear_headband.scad>
-
-SCALE_FACTOR=SIZE/9;
-
-echo("scale factor: ", SCALE_FACTOR);
-echo("bottom diameter: ", SIZE/SCALE_FACTOR);
-
-
-difference() {
-  union()
-    for (i=[-1,1])
-      translate([i*2, 0, 0])
-        rotate(i*90, [0, 1, 0])
-          scale(1/SCALE_FACTOR)
-            union() {
-              translate([0, 0, SIZE+20+60])
-                rotate(90, [0, 1, 0])
-                  scale(1.6)
-                    catear_headband(thickness=5, with_rake=false);
-              translate([0, 0, 20])
-                cylinder(h=10, r=SIZE, $fn=360);
-              cylinder(h=20, d=SIZE, $fn=360);
-            }
-  translate([0, 0, -SIZE*(1/SCALE_FACTOR)*5])
-    cube(SIZE*10*(1/SCALE_FACTOR), center=true);
-}
-
-/*
-scale(1/SCALE_FACTOR) {
-translate([0, 0, 30])
-scale([1, 1, -1])
-difference() {
-  union() {
-    translate([0, 0, 20])
-      cylinder(h=10, r=SIZE, $fn=360);
-    cylinder(h=20, d=SIZE, $fn=360);
-  }
-  translate([0, 0, SIZE+20+60])
-    rotate(90, [0, 1, 0])
-      scale(1.6)
-        catear_headband(thickness=5, with_rake=false);
-}
-scale(1.6)
-  translate([0, 0, HEIGHT/2])
-    catear_headband(thickness=5, with_rake=false);
-}
-*/

foxear_headband.scad

@@ -1,7 +1,7 @@
 use <catear_headband.scad>
 include <headband.scad>
 
-module foxear_headband(debug=DEBUG, size=SIZE, height=HEIGHT, thickness=THICKNESS, part=PART, stretch_len=STRETCH_LEN, tip_len=TIP_LEN, tip_bend=TIP_BEND, ear_scale=1.2, ear_bend_factor=0.05, ear_stretch_factor=1.2, ear_angle=30) {
+module foxear_headband(debug=DEBUG, size=SIZE, height=HEIGHT, thickness=THICKNESS, part=PART, stretch_len=STRETCH_LEN, tip_len=TIP_LEN, tip_bend=TIP_BEND, ear_scale=1.2, ear_bend_factor=0.01, ear_stretch_factor=1.2, ear_angle=30) {
   catear_headband(
     debug=debug,
     size=size,

globals.scad

@@ -1,19 +0,0 @@
-$fn=90;
-DEBUG=false;
-SIZE=60;
-HEIGHT=4.6;
-THICKNESS=3;
-PART=0.7;
-STRETCH_LEN=40;
-TIP_LEN=0.05;
-TIP_BEND=20;
-RAKE_DEPTH=1;
-RAKE_WIDTH=1;
-RAKE_STRETCH=1;
-RAKE_CHAMFER=0.5;
-CHAMFER=1;
-CHAMFER_SHAPE="curve";
-
-INSERTICLE_X = 4.6;
-INSERTICLE_Y = 7.4;
-INSERTICLE_Z = 5.4;

headband.scad

@@ -1,4 +1,19 @@
-include <globals.scad>
+$fn=360;
+DEBUG=false;
+SIZE=60;
+HEIGHT=4.6;
+THICKNESS=3;
+PART=0.7;
+STRETCH_LEN=40;
+TIP_LEN=0.05;
+TIP_BEND=20;
+RAKE_DEPTH=1;
+RAKE_WIDTH=1;
+RAKE_STRETCH=1;
+RAKE_CHAMFER=0.5;
+CHAMFER=1;
+CHAMFER_SHAPE="cone";
+
 use <chamfer.scad>
 
 module partial_ring(part, radius, thickness, height) {
@@ -8,9 +23,9 @@ module partial_ring(part, radius, thickness, height) {
         square([thickness, height], center=true);
 }
 
-module headband(debug=DEBUG, size=SIZE, height=HEIGHT, thickness=THICKNESS, part=PART, stretch_len=STRETCH_LEN, tip_len=TIP_LEN, tip_bend=TIP_BEND, rake_depth=RAKE_DEPTH, rake_width=RAKE_WIDTH, rake_stretch=RAKE_STRETCH, rake_chamfer=RAKE_CHAMFER, chamfer=CHAMFER, chamfer_shape=CHAMFER_SHAPE, with_rake=true, details=true) {
+module headband(debug=DEBUG, size=SIZE, height=HEIGHT, thickness=THICKNESS, part=PART, stretch_len=STRETCH_LEN, tip_len=TIP_LEN, tip_bend=TIP_BEND, rake_depth=RAKE_DEPTH, rake_width=RAKE_WIDTH, rake_stretch=RAKE_STRETCH, rake_chamfer=RAKE_CHAMFER, chamfer=CHAMFER, chamfer_shape=CHAMFER_SHAPE) {
   union() {
-    chamfer(size=(details)?chamfer:0, child_h=height, child_bot=-height/2, shape=chamfer_shape) union() {
+    chamfer(size=chamfer, child_h=height, child_bot=-height/2, shape=chamfer_shape) union() {
       color("purple")
         partial_ring(part, radius=size, thickness=thickness, height=height);
       rotate( 90-180*part, [0, 0, 1])
@@ -41,7 +56,7 @@ module headband(debug=DEBUG, size=SIZE, height=HEIGHT, thickness=THICKNESS, part
                   );
         }
     }
-    if (with_rake) for (i=[-size/2:size/2]) {
+    for (i=[-size/2:size/2]) {
       rotate(i*2-rake_width/2, [0, 0, 1])
         intersection() {
           scale([1, 1, rake_stretch/(rake_depth/height)])
@@ -54,6 +69,6 @@ module headband(debug=DEBUG, size=SIZE, height=HEIGHT, thickness=THICKNESS, part
             color("red")
               cube([2*rake_depth, rake_width, height], center=true);
         }
-    }
+    };
-  }
+  };
 }

loveboard-cover-r2-cat.scad

@@ -1,83 +0,0 @@
-/**
- * This requires
- * https://files.printables.com/media/prints/451501/stls/4205518_58958bba-4c36-4995-b4e7-da5abd1ba821/loveboard-cover-r2.stl
- * 
- * to be placed under `./stls/LoveBoard-cover-R2.stl` in order to work
- * but it needs a run in meshlabs uniform fcae orientation filter for
- * openscad to be happy with it
- * 
- * if rendering is missing the ear infill, `Design` > `Flush Caches`
- * may be required.
- */
- 
-include <headband.scad>
-use <catear_headband.scad>
-
-HEIGHT=11;
-THICKNESS=1;
-SIDE_LEN=20;
-BEND_FACTOR=0.15;
-STRETCH_FACTOR=1.2;
-CHAMFER=0;
-CHAMFER_SHAPE="none";
-DEBUG=false;
-
-FILL=true;
-FILL_HEIGHT_FACTOR=0.9;
-FILL_HEIGHT_FALLOFF_STEP=0;
-FILL_HEIGHT_FALLOFF_FACTOR=0.98;
-FILL_HEIGHT_FALLOFF_EXPONENT_FACTOR=3;
-FILL_STEP=0.5;
-
-module loveboard_cover_r2_cat() {
-  $fn=90;
-  union() {
-    difference() {
-      union() {
-        for (i=[-1,1])
-          scale([i, 1, 1]) 
-            translate([-23, 23, 5.5])
-              rotate(-65) {
-                catear(
-                  height=HEIGHT,
-                  thickness=THICKNESS,
-                  side_len=SIDE_LEN,
-                  bend_factor=BEND_FACTOR,
-                  stretch_factor=STRETCH_FACTOR,
-                  debug=DEBUG,
-                  chamfer=CHAMFER,
-                  chamfer_shape=CHAMFER_SHAPE
-                );
-                if (FILL) {
-                  echo("BEGIN FILL");
-                  for (i=[FILL_STEP:FILL_STEP:(SIDE_LEN-FILL_STEP)])
-                    color([0, (256-i*8)/256,0]) {
-                      fill_height=(
-                        HEIGHT * FILL_HEIGHT_FACTOR
-                      * pow(FILL_HEIGHT_FALLOFF_FACTOR,
-                          (SIDE_LEN-1-i)*FILL_HEIGHT_FALLOFF_EXPONENT_FACTOR)
-                      - ((SIDE_LEN-1-i)*FILL_HEIGHT_FALLOFF_STEP)
-                      );
-                      echo([i, fill_height]);
-                      translate([0, 0, (fill_height-HEIGHT)/2])
-                      catear(
-                        height=fill_height,
-                        thickness=THICKNESS,
-                        side_len=i,
-                        bend_factor=BEND_FACTOR,
-                        stretch_factor=STRETCH_FACTOR,
-                        chamfer=0,
-                        chamfer_shape=CHAMFER_SHAPE
-                      );
-                    }
-                  echo("END FILL");
-                }
-              }
-      }
-      scale(0.9999) hull() import("stls/LoveBoard-cover-R2.stl");
-    }
-    color("red") import("stls/LoveBoard-cover-R2.stl");
-  }
-}
-
-loveboard_cover_r2_cat();

mouseear_headband.scad

@@ -1,20 +0,0 @@
-use <catear_headband.scad>
-include <headband.scad>
-
-module mouseear_headband(debug=DEBUG, size=SIZE, height=HEIGHT, thickness=THICKNESS, part=PART, stretch_len=STRETCH_LEN, tip_len=TIP_LEN, tip_bend=TIP_BEND, ear_scale=1, ear_bend_factor=0.65, ear_stretch_factor=1, ear_angle=40) {
-  catear_headband(
-    debug=debug,
-    size=size,
-    height=height,
-    thickness=thickness,
-    part=part,
-    stretch_len=stretch_len,
-    tip_len=tip_len,
-    tip_bend=tip_bend,
-    ear_scale=ear_scale,
-    ear_bend_factor=ear_bend_factor,
-    ear_stretch_factor=ear_stretch_factor,
-    ear_angle=ear_angle);
-}
-
-mouseear_headband();

pressfit_catears.scad

@@ -1,32 +0,0 @@
-include <globals.scad>;
-
-use <catear_headband.scad>;
-use <pressfit_headband.scad>;
-use <chamfer.scad>;
-
-EAR_SCALE = 1.5;
-EAR_BEND_FACTOR = 0.15;
-EAR_STRETCH_FACTOR = 1.2;
-
-difference() {
-translate([20*pow(0.99, SIZE/2*EAR_SCALE-1-THICKNESS), 0, -THICKNESS/2])
-union() for (i=[0:SIZE/2*EAR_SCALE-1]) {
-  j=pow(0.99, i);
-  chamfer_ = floor(abs(2*i/(SIZE/2*EAR_SCALE-1)-1));
-  translate([-j*20, 0, 0])
-    rotate(90, [0, 1, 0])
-      /*chamfer(size=1, child_h=1, child_bot=-0.5, shape=CHAMFER_SHAPE)*/
-        catear(
-          debug=DEBUG,
-          height=INSERTICLE_Z*1.2,
-          thickness=THICKNESS,
-          side_len=SIZE/2*EAR_SCALE-i,
-          bend_factor=EAR_BEND_FACTOR,
-          stretch_factor=EAR_STRETCH_FACTOR,
-          chamfer=chamfer_,
-          chamfer_shape=CHAMFER_SHAPE
-        );
-}
-translate([0, 0, -THICKNESS]) cube([100, 100, THICKNESS], center=true);
-scale([1, 1, 2]) inserticle();
-}

pressfit_headband.scad

@@ -1,9 +1,7 @@
-include <globals.scad>
+include <headband.scad>
-
-use <headband.scad>
 
 module inserticle() {
-    cube([INSERTICLE_X, INSERTICLE_Y, INSERTICLE_Z], center=true);
+    cube([4.6, 7.4, 5.4], center=true);
 }
 
 module pressfit_headband(debug=DEBUG, size=SIZE, height=HEIGHT, thickness=THICKNESS, part=PART, stretch_len=STRETCH_LEN, tip_len=TIP_LEN, tip_bend=TIP_BEND) {

pressfit_horns.scad

@@ -1,67 +0,0 @@
-include <globals.scad>;
-
-use <pressfit_headband.scad>;
-
-$fn=360;
-A=30;
-N=4;
-R=45;
-LENGTH=100;
-TWIST=720;
-STEPS=360;
-SLICES=max(TWIST, STEPS, LENGTH);
-SHEIGHT=LENGTH/STEPS;
-BEND_X_FACTOR=0.5;
-BEND_Y_FACTOR=1;
-
-COLORS=[
-"#f00",
-"#f70",
-"#7f0",
-"#0f0",
-"#0f7",
-"#07f",
-"#00f",
-"#70f",
-"#f07"
-];
-
-difference() {
-  union() for (step=[1:STEPS]) {
-    a = A*(1-(step-1)/STEPS);
-    b = A*(1-step/STEPS);
-    r = TWIST/STEPS*(step-1);
-    sh_xy = 0;
-    sh_yx = 0;
-    sh_xz = 1/STEPS*step*BEND_X_FACTOR;
-    sh_yz = 1/STEPS*step*BEND_Y_FACTOR;
-    sh_zx = 0;
-    sh_zy = 0;
-    t_x = sh_xz*SHEIGHT*(step-1)*0.5;
-    t_y = sh_yz*SHEIGHT*(step-1)*0.5;
-    t_z = LENGTH/STEPS*(step-1);
-    sc_x = 1;
-    sc_y = 1;
-    sc_z = 1;
-    mm = [
-      [sc_x,  sh_xy, sh_xz, t_x],
-      [sh_yx, sc_y,  sh_yz, t_y],
-      [sh_zx, sh_zy, sc_z,  t_z],
-    ];
-    echo(a, b, b/a, r, mm);
-    multmatrix(mm)
-      color(COLORS[(step-1)%9])
-      linear_extrude(
-        SHEIGHT,
-        center=false,
-        twist=TWIST/STEPS,
-        scale=b/a,
-        slices=SLICES/STEPS
-      ) rotate(R-r)
-        circle(d=a, $fn=N);
-  }
-  translate([0, 0, INSERTICLE_Z/2])
-    inserticle();
-}
-
-echo("twist angle: ", TWIST/STEPS);