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BackLeft-hand and right-hand sub-panels left_panel_width = 12*3 + tolerance*2; //three knobs plus space between them //left_panel_spacing = left_panel_width / 3 + tolerance*8; right_panel_width = width_mm - thickness; // draw a "vertical" wall } // Least I Could Do (wtf image size? If(preg_match("@.*(