scad/headband.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="curve";

use <chamfer.scad>

module partial_ring(part, radius, thickness, height) {
  rotate(180-180*part, [0, 0, 1])
    rotate_extrude(angle=360*part)
      translate([radius, 0])
        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) {
  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])
        translate([stretch_len/2,  size, 0]) {
          color("orange") cube([stretch_len, thickness, height], center=true);
            color("purple") translate([stretch_len/2, tip_bend, 0])
              rotate(90+180*tip_len, [0, 0, 1])
                partial_ring(
                  part=tip_len,
                  radius=tip_bend,
                  thickness=thickness,
                  height=height
                );
        }
      rotate(-90+180*part, [0, 0, 1])
        translate([stretch_len/2, -size, 0]) {
          color("orange")
            cube([stretch_len, thickness, height], center=true);
          color("purple")
            scale([1, -1, 1])
              translate([stretch_len/2, tip_bend, 0])
                rotate(90+180*tip_len, [0, 0, 1])
                  partial_ring(
                    part=tip_len,
                    radius=tip_bend,
                    thickness=thickness,
                    height=height
                  );
        }
    }
    for (i=[-size/2:size/2]) {
      rotate(i*2-rake_width/2, [0, 0, 1])
        intersection() {
          scale([1, 1, rake_stretch/(rake_depth/height)])
            translate([0, rake_width/2, 0])
              rotate_extrude(angle=rake_width)
                translate([rake_depth/2-size+thickness/2, 0, 0])
                  scale([1, 0.5, 1])
                    circle(r=rake_depth, $fn=3);
          translate([rake_depth/2-size+thickness/2-rake_chamfer, 0, 0])
            color("red")
              cube([2*rake_depth, rake_width, height], center=true);
        }
    };
  };
}