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BackV_margin = hole_dist_top*2 + thickness; col_left = thickness * 1.2; right_rib_x = width_mm - thickness*2.2; left_rib_x = thickness * 1.2; right_rib_x = width_mm - thickness*2; // draw panel, subtract holes union() { difference() { linear_extrude(height) railProfile(); railSupportCavity(height); } } // replace the