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0]) rotate([0, 0, i * (360/RingMarkings)] cube([RingWidth*.5, MarkingWidth, 2], center=true); cube([8, 3, KnobHeight], center=true); if (RingMarkings>0 for (i=[0 : RingMarkings-1] rotate([0, 0, i * (360/RingMarkings)] cube([RingWidth*.5, MarkingWidth, 2], center=true); cube([8, 3, KnobHeight], center=true); // Flat for D-shaped hole // D shaft shape for shaft cutout // set the quantity, quality, radius, height, and placement cylinder_starting_rotation = -33.3; // these.

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