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Left_rib_x = thickness * 1.2; right_rib_x = width_mm - right_rib_thickness; // projection: make a hole with radius: ", hole_r , " at ", hole_dist_side, hole_dist_top); echo("Putting a hole for mounting screw: ISO 1481-ST 2.2x6.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1830732.

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