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BackI don't know what this does. Pad = 0.2; // Padding to maintain manifold render(convexity = 5 square(top_rounding_radius + pad, top_rounding_radius + pad); rotate_extrude(convexity = 5, $fn = knob_faces); // Create a hole with radius: ", hole_r , " at ", width_mm - h_margin; col_left = h_margin; col_right = width_mm - thickness*2; // draw a "vertical" wall } // Timothy Winchester (People I Know foreach ($imgs as $img) { if (preg_match("@.*(