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// a chain around two gears of given radii (r1, r2) and distance;
// coord origin is at the gear with r1
module chain(r1, r2, dist, chain_width, chain_height) {
// rotate([90, 0, 0])
difference() {
chain_template(r1 + chain_height, r2 + chain_height, dist, chain_width);
chain_template(r1, r2, dist, chain_width + 1);
}
}
module chain_template(r1, r2, dist, chain_width)
hull () {
cylinder(r=r1, h=chain_width, center=true);
translate([dist, 0, 0])
cylinder(r=r2, h=chain_width, center=true);
}
chain(20, 30, 100, 10, 5);
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