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The top edge or circumference using spheres (or rather regular polyhedra) arranged in a circle. Used only where users want round outlines by specifying ≥30 faces. Quality == "final rendering") ? 1 : quality == "preview") ? 6 : quality == "preview") ? 0.5 : quality == "fast preview") ? 12 : 12; // Number of faces around the knob? Knurled = 1; // actually.. I don't know what this does. Pad = 0.2; // Padding to maintain manifold rotate_extrude(convexity = 5, $fn = knob_faces); // Create a hole for mounting screw: ISO 1481-ST 2.2x4.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1924224 16A (HC Generic Phoenix Contact connector.

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