My own preference is to center about the origin: module box(){ difference(){ cube([width,depth,length],center=true); //translate([thickness,thickness,thickness]) // no longer needed cube([width-2*thickness,depth-2*thickness,length-2*thickness],center=true); } } -- View this message in context: http://forum.openscad.org/Is-there-a-better-way-of-doing-it-tp20212p20215.html Sent from the OpenSCAD mailing list archive at Nabble.com.