You can use AirPort Utility to change the name of the USB printer that is connected to your base station or Time Capsule.
Open AirPort Utility, located in the Utilities folder in the Applications folder on a computer using Mac OS X, and in Start > All Programs > AirPort on a Windows computer.
Select the base station or Time Capsule you’re setting up, and then click Manual Setup. Enter the password if necessary.
Click Printers in the toolbar.
Type a new name in the USB Printers field.
You can also connect a USB hub to the USB port on the base station, and then connect multiple printers to the USB hub. You can then use AirPort Utility to rename all of the printers.