[wwwigham]

Oh man, a friend of mine did exactly the same thing back in college, but using a tessel instead of a rpi: https://github.com/JRJurman/automated-ticket-printer

In action: https://www.youtube.com/watch?v=sOBhAbXNgUI

IIRC, he actually used it on coop for awhile with a physical ticket spike to store completed tickets on. It's pretty cool to see when the issue volume is just right.