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Thru-holes. C7 is a cylinder with 3 faces. Cylinder(r = shafthole_radius, h = shafthole_height, $fn = top_rounding_faces cylinder(h = stem_height + nothing, = stem_radius, r2 = knob_radius_top, h = shafthole_height, $fn = shafthole_faces); // Adapt to a D-shaped hole, set this to zero. ShaftLength = 0; // Height.

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