Check this link for printing softwarte for your Ricoh:http://www.ricoh-usa.com/downloads/s...?tsn=Ricoh-USA
The MPC 3000 seems to have a Fiery PS RIP, so PostScript is NOT your problem, but rather the backend connection to the printer which the Ricoh software will fix - hopefully.
PS: common misconception - printers for OS X, or Macs in general, do NOT have to be postscript. OS X's printing engine(CUPS) uses postscript as a lingua franca for all printing, but the CUPS backend translates it to whatever the device requires - which is why you can use so many NON-postscript printers with OS X. My favourite example - OKIDATA 9-pin dot matrix printers, a technology that pre-dates the PC, work fine with OS X - outputting high-res postscript images and type in black-and-white (well, grey and white on my old machine) at a whopping 96 dpi!!! You have to be a total geek (like myself) to find that amusing.