This is not a post for any technical issue but rather a suggestion for future improvement in the way mobile device can select the printer the user wants print on.
The idea here is to add the ability to print dedicated stickers with QR code from the iPrint Appliance administrative interface on behalf of each printer definition. The previously printed sticker then must be put on the corresponding printer.
I guess that with the right "app" for Android or iOS for your mobile it must be quite simple for the user to flash the QR code found on the desired printer and having it defined as target for printing its needed documents.
Think of that... a little sticker on each printer with something mentioning "Powered by iPrint Appliance from Novell" a QR code and the printer name in clear-text.