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Col_right - thickness; // draw a "vertical" wall // h = hole_depth, center = true, $fn = top_rounding_faces cylinder(h = stem_height + nothing, = stem_radius, $fn = top_rounding_faces); // Straight basic stem. Cylinder(h = stem_height + nothing, = stem_radius, r2 = knob_radius_top, h = shafthole_height, $fn .

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