In the PS3 system software (3.40 and higher) is support built in for several USB printers.
4.41 vsh printer files: http://www.mirrorcreator.com/files/TKBBVBII/vsh-printer-441.rar_links
Main Printer functionality in VSH is handled by:
It allows two execution modes which will result in each different Interface Usage.
Adding a Printer will create a file containing peculiar Printer information:
driver and configuration is handled by /dev_flash/vsh/module/print_canon_library.sprx
driver is handled by /dev_flash/vsh/module/print_epson_library.sprx, configuration by /dev_flash/vsh/etc/print/epson,pmd