Since moving to my mac I have had problems getting my Samsung ML1210 Laser Printer to work correctly. I followed the instructions at http://www.linuxfoundation.org/en/OpenPrinting/MacOSX/samsung-gdi and got it printing but it was always missing off the top of the page. On searching around I found that I wasn’t the only person with this problem and if I downgraded my Foomatic-RIP to an older version things worked fine. For more information on this see http://discussions.apple.com/thread.jspa?threadID=2145980&tstart=105 and http://kurund.com/blog/2008/12/17/samsung-ml1710-printer-configuration-on-mac-os-x-105-leopard/ the key things is to get the release of Foomatic-RIP from the 30th Jan 2008.
I’ve reported this bug to the team the supports Foomatic so maybe there will be a fix in future versions.