My 3D printers are the Monoprice Maker Ultimate, the Creality Ender 3 Pro, and the Robo3D C2. 

My 3D printer recommendations are:

the Flashforge Adventurer 5M, a fantastic and easy-to-use 3D printer that can produce excellent results for under $400.

and the Creality Ender 3 V2, which is cheaper and larger than the Voxel. It can make higher-quality prints than the Voxel when tuned, but needs to be assembled and is harder to set up/calibrate. It will require more maintenance and is better suited for someone willing to tinker.

My printers all use one of the three main 3D Printing technologies, called Fused Deposition Modeling (FDM). The process starts at the spool of material. This is called filament, and it is what FDM 3D Printed parts are made of. The most popular type of filament is PLA. The filament is pushed through feeder gears at a precise speed. The filament is fed into a heater block at temperatures of around 200 degrees Celsius for PLA. The filament melts and is then extruded through the nozzle, usually at a diameter of 0.4mm. The extruder assembly moves around the print bed, depositing filament. When one layer has deposited, the print bed moves down and another layer is started above the previous one. A standard layer height is 0.2mm.