We built this printer to take Snapchat screenshots sent to us and print them out at events. It got a little nutty when we decided to put the hardware into a tiny box and 3M-tape it to walls. The faceplate of the printer is the actual Snapcode that users send their Snaps to, and a modified inkless printer (along with batteries, lighting, mifi, ddwrt router, cooling, and other electronics...) is jammed inside.
It was a ~4wk side project.