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// Padding to maintain manifold rotate_extrude(convexity = 5, $fn = sphere_indents_faces); height = cone_indents_height + 2 * nothing, shafthole_cutoff_arc_height + 2 * nothing, shafthole_height + 2 + hole_diameter + hole_margin*2; side_margin = (board_width - hole_hdist) / 2.

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