The Zortrax M200 is the best 3D printer I've ever used.
https://www.3dhubs.com/3d-printers/zortrax-m200
(I've used a Taz 5, Ultimaker, 3D Systems Cube, Ecocycle, and a Dremel Ideabuilder)
You load up your 3D model into the software, make sure everything looks right. Save the file to a SD card and then pop it into the machine, select your file and then you can walk away. I've never had any trouble with failed prints on this machine after over 1500 hours of use. The printer prints all sorts of materials too.
If you want to compare 3D printer reviews use the 3D hubs guide. It's the most comprehensive guide I've seen online.
https://www.3dhubs.com/best-3d-printer-guide