Honestly what isnt a bad approach, buying one used from a hobbyist. You get the full run down of the machine, rarely with a sales pitch and they arent afraid to tell you what theyre selling is NOT what you should be looking for. You also arent, normally, going to be buying a machine with tons and tons of miles on them. Most find craigslist because the machine's owner upgraded or realized how long its been on a shelf for. Never bought 3d printer but have bought tons of tools like my cnc router, 2 desktop lathes, laser cutter and press brake, all small models I found not really needing them but always looking out for them.. I learn more just going to look at them than i do running them loljkjk. Ive ran into this buying used cars too. There is a weird niche of things that cost so much new that most buying them are die hard hobbyists or trying to start a job shop. Either way they know so much about the machine youre buying amd love telling you everything they did with it.