There is a bug sometimes brought on by updating the Epson or Canon print drivers, that can cause printing failures followed by “rastertoescpii failed” being written to the system.log file.

This has bee reported to affect Macs running OS X 10.6-10.9, but the fix is relatively simply. Go into the Sharing system preference pane, and make sure the Mac has a valid computer name. Remove special or garbage looking characters, and if that doesn’t work try removing all spaces and punctuation.