I have a double-sided model of a bowl lid with tool paths calculated and previewed for the single bowl. When I array copy the tool paths for the top side it all looks fine on preview but when I then array copy the underside with the same gap setting of 20mm and calculate and preview, the bottom side preview is misaligned. The first (last) lid underside looks fine but then the gap is progressively reducing as I look at the six lids in preview. The rebates on the underside are not lining up with their other sides. Is there a special trick when array copying the tool paths for a double-sided job? Please see attached. This is the underside.