printing problems

Printer is Xerox Phaser 7700 with 128MB memory. I deal with raster graphics
a lot and my drawing files can be as large as 50MB or even bigger. For some
reason, when I print into the Phaser Printer, I get a message that says "not
enough memory to process this command". When I go to settings, the printer
doesn't give me an option to compile the print/plot in the computer instead
of the printer. I sent an email message to Xerox and they directed me to
their phone tech support service which gave me nothing but a series of
recorded messages, something like an interactive diagnostic thingie which
did not help at all. Can someone here help me?