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In general, try to avoid the danger that redistributors of a pot rotary_knob_row = top_row - 30; //special-case the top square(smoothing_radius+pad,smoothing_radius+pad); rotate_extrude(convexity=10, $fn = top_rounding_faces square(top_rounding_radius + pad, top_rounding_radius + pad); circle(r = top_rounding_radius, $fn = sphere_indents_faces); height = 266 + tolerance; rotate_vector_cos = 0.94; // 'x' of 20 degree rotation.

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