... . But they won't have a clue what you are talking about in terms of calibrating the printer, so do this: a. take a small sample PDF file for printing. b. take it home and measure carefully across the grid lines. You won't be able to correct X and Y directions independently, so measure along the tracks rather than across them, as this is clearly the more critical dimension. c. calculate the required correction needed (if any) and enter it as the output scaling factor in Templot: 2_230839_290000001.png d. make a fresh PDF file and take it for testing in the same way. e. if it's ok, get them to do your full PDF file created using the same scaling factor. Don't wait too long between these steps in case they get a different printer, or have it serviced, etc. If you have a laptop computer you may be able to take it with you and do all this in the shop. They will regard you as a nutter and be glad to get rid of you, ...