I’ve been doing some experimenting with parts printing on a Monoprice I got for free. Actually used it to print a castle nut wrench for my first AR (PSA Magpul LPK/17 Design Lower/Aero BCG/DB Assembled Upper). I have access to some nicer printers (Prusa, Formlabs, Lulzbot, Stratesys) via my old job as a TA for a university 3D printing lab.