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we've had a lot of troubles in the past with duplexing and skew on digital.
Something I didn't know and was told by a xerox employee, if you align your tray say for a heavyweight1 12 x 18, throwing a heavyweight2 12 x 18 through the same tray will not guarentee the same alignment. each tray needs to be aligned for that sized stock, weight and coating. very tedious but in most cases if you're out a mile this is your problem. depending what software you're using as well, i know ours allows for an image shift.
some xerox machines also have a manual skew, something that was adjusted with out my knowledge and was throwing everything out. make sure you find out if your machine has something like that, it causes a lot of headaches and saves a lot of time if you get this skew bang on.
GopherBroke is right about the shrinkage too, something that I haven't noticed drastically but I have noticed losing 1/32" image area on gloss stocks due to slipage, again its such a small amount but it does effect the overall project if someone is just trimming to crops
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