eps = 0.01;

// Q6 lens dimensions
black_ring_d = 18.5 + 0.5;
yellow_ring_d = 19.5 + 1;
yellow_ring_d2 = 20.5;
black_ring_h = 3.5;
yellow_ring_h = 3.5;
lens_overhang = 2;

clip_h = 0.5;
clip_w = 1;

wall = 1;

body_h = wall + lens_overhang + black_ring_h + yellow_ring_h;
body_d = 2*wall + yellow_ring_d2;

$fn = 128;
difference() {
	cylinder(r = body_d/2, h = body_h);
	translate([0, 0, wall])
		cylinder(r = black_ring_d/2-wall, h = lens_overhang+eps);
	translate([0, 0, wall + lens_overhang])
		cylinder(r = black_ring_d/2, h = black_ring_h+eps);
	translate([0, 0, wall + lens_overhang + black_ring_h]) difference() {
		cylinder(r = yellow_ring_d/2, h = yellow_ring_h+eps);
		for (angle = [0:90:360]) rotate ([0, 0, angle])
			translate([yellow_ring_d/2 - clip_w, -yellow_ring_d/2,
				yellow_ring_h - clip_h])
				cube([clip_w + eps, yellow_ring_d, clip_h + 2*eps]);
	}
}