I work on a small company who have 2 Xerox Workcentre 4150. That company have too, 3 new mac's with mountain lion. When i configure try print anything it show's to me a Filter error.
I need to solve this problem with some urgency.
Follow this one and you should be OK.
It seems that Apple as made a few changes that require the manufacturers to change drivers. This will take time.
Sorry, forgot to post the link for the PPD. Here it is. I'm assuming that your printer has Postscript. If not, let me know and I give you other solution.