Re: Xerox 700 or Docucolour 5000
Registration is good, not excellent. We all use mechanical machines, friction, heat etc... It is not a conventional press, it's a printer, but the registrationmarks by double sided printing is good. All of the technicians use a laptop and software to get to a point of satisfaction, usually a difference per side of 1 mm. But when you open your 242, 252, 260 or 700 on the frontside, pull the tray out (the one with the fuserpart etc..) you see on the left the part of the layedge of your paper. You can manually / mechanically rotate this part, look at the screws above and below on top. Usually use one screw to get a quickly result, descrew - rotate, screw and test with one print (double-sided). But you have to do this again for the heaver paper (190 grams and above). 80, 90 100, 120, 135, 150, 160 and 170 grams will have the same result and uses the same layedge.
Notice that all of the mechanics uses the same restriction, this restriction is a area between the 1mm and 2mm per side. When you look at your double-sided print and you have a difference of 1mm per side, this means that the total difference between registration is 2mm and is acceptable for any mechanic: BUT NOT TO US - THE PRINTERS.
So uses the above to put your machine in a good and stable double-sided registration with marks. I have a rather poor difference between the 2-sides: less then 1mm total.