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Back(8+tolerance/5); // generally-useful spacing amount for vertical columns of stuff col_left = thickness * 1; right_rib_x = width_mm - h_margin; working_height = height - v_margin - title_font_size*2; working_width = width_mm - right_rib_thickness; // projection: make a hole with radius: ", hole_r , " at ", width_mm - thickness*2.