I recently discovered Fingerprint (Collobos Software)which allows you to print wirelessly from your iPad and iPhone
on a network enabled printer. It's not an iPad app--you download the program on your desktop or laptop for $9.95. There's a free version to test whether it works in your system. In my system, my Canon printer--which does not
have Airprint--now shows up when I press the printer icon on my iPad and the printing comes out perfectly.