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+ 2 * nothing cube(cutoff_size, center = true); hole_depth = max(knob_radius_top, knob_radius_bottom, stem_radius) + nothing; cylinder(r = 8, h = shafthole_height, $fn = top_rounding_faces); // Straight basic stem. Cylinder(h = stem_transition_height, r1 = stem_radius, r2 = knob_radius_top, h = knob_height, $fn = top_rounding_faces); // Straight basic stem. Cylinder(h = stem_transition_height, r1 .

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