There is something now out by Filabot. It's called the Filabot Reclaimer. It's priced at $439, and it grinds up your old prints.


They advertise that it can be used with the Filabot Wee or the Filabot Original to recycle ABS, PLA, and HIPS plastic. I'm sure it would probably work with other filament extruders as well. It's currently on pre-order and I think it takes up to 4 weeks to have shipped. Might be what you are looking for. Probably a ton easier than using Liquid Nitrogen LOL.