I have one in our library’s makerspace (the 3D40) and I have to say it’s pretty darn flawless. The only times it has messed up has been when the kids forget to build supports into their files or load the filament spools incorrectly.
Their new model (3D45) can do different filaments (mine is PLA only) and has a heated bed…they are offering it at a discounted pre-sale price now. They also offer refurb units of the older models at a good deal too so it’s worth contacting them to see what they have available.
Their tech support is also fantastic…I hop on live chat with them and can get an answer immediately.
I’ve been super happy with it…it just works, and when working with teens of varying skill levels that’s critical! Happy to answer any questions anyone has.