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Not as efficient as a cylinder with 3 faces. Cylinder(r = shafthole_radius, h = engraved_indicator_depth * 2, $fn = sphere_indents_faces); height = 128.5; // A little less then 3U // Thickness of module (mm) - Would not change this if you want the ring. RingWidth = 0; // 0 = A cylindrical knob, any other entity.

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