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== "preview") ? 6 : quality == "rendering") ? 3 : quality == "fast preview") ? 2 : 2; // Website specifies a thickness of 2mm - but adjust to shift left and right columns toward the center center_adjust = 5; //mm left_col = 10 + center_adjust; right_col = width_mm - right_rib_thickness; // projection: make a hole with radius: ", hole_r , " at ", width_mm - thickness*2; // draw panel, subtract holes panel(width); // lower h-rib reinforcer cylinder(r=hole_r, h=thickness*2); echo("Putting a hole for mounting screw: ISO 1481-ST 2.2x6.5 C or ISO 7049-ST 2.2x6.5 C (http://www.fasteners.eu/standards/ISO/7049.

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