I've loved having a Tinkerine Ditto Pro (2 years old now) in our centrally-located library. It's been very easy to use and reliable. No problems with it at all.
Engineering and CAD projects use all the school's 3-D printers, including ours. Students who may never have seen a 3-D printer get to watch things being printed and ask questions. I am fortunate to have a senior with extensive 3-D print knowledge who guides curious students through the print process from downloading to converting/editing to transferring to printing (around Engineering and CAD projects, which of course are given priority).
TG