Printing VirtualBox Linux host Windows guest

Printing from Windows GUEST in Linux HOST – VirtualBox via CUPS

1. HOST (Linux):
   1.a: add printer to CUPS @ http://localhost:631/admin
   1.b: virtualbox guest connects through BRIDGED networking
2. GUEST (Windows):
   2.a: add Network printer
   2.b: point to:  http://hostip:631/printers/printer_name_as_set_in_CUPS_step_1a

Source: UbuntuForums