I recently bought an HP 6600 printer to replace a cheapo Lexmark printer.
I'm making maps -> photoshop to Illy to print with tiling set at 6-8 pages. When I print on the new HP, the resize percentages are off; so streets, numbers, text, etc. do not line up when pieced together.
This did not happen with the cheapo Lexmark, so I am assuming that it is the printer?
Any ideas on what is causing this and how to fix it?
Probably the print driver. Try switching between letting Illustrator/InDesign have print control and your printer. Odds are pretty good switching the printer is the culprit. You can also try exporting the multipage output to PDF and see if there is any scaling. Try printing to another printer, too.