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Wall(h=4, w=width_mm-hole_dist_top-4); // one more to mount the circuit board sideways on // h = knob_height, $fn = top_rounding_faces square(top_rounding_radius + pad, top_rounding_radius + pad); rotate_extrude(convexity = 5, $fn = shafthole_faces); // Adapt to a dual or quad would add very little cost even.

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