If you connected a printer to the USB port on a base station or Time Capsule on your wireless network, and computers on the network can’t print, you can use these suggestions to try to fix the problem.
Make sure the printer is plugged into a wall outlet and is turned on.
If the printer is on, turn it off, wait a few seconds, and then turn it on again.
Make sure the cables are securely connected to the printer and to the wireless device’s USB port.
Make sure the printer is selected in the Printer List on the client computers.
On a computer using Mac OS X: Open System Preferences and click Print & Fax. Select the printer, and then click Delete. Click Add and select the printer from the list. If the printer is not in the list, click Add (+) and when you find the printer in the list, click Add.
On a computer using Windows: Install Bonjour for Windows from the AirPort Utility CD, and follow the onscreen instructions to connect to the printer.
Some USB printers are not compatible with AirPort. Check with the manufacturer if you still can't print. You might find new printer drivers at the manufacturer's website.