Print wirelessly from USB printer connected through router
Printer Pro

You can use Printer Pro. This app will scan your network for all printers using the same services as OS X, to find all printers available rather than just AirPrint printers.


  Compatible with any Printer (Wi-Fi and USB)
  Printer Pro automatically finds a printer in your wi-fi network.


You can download Printer Pro Lite for free to test if your printer is found by the app before purchase.