M58 what you are not getting is the plastic models you see for home use are nothing like what was used here. They take plastic, melt it and deposit. the systems used here have a bed of media( plastic, metal, resin even plaster ) a substance/ light( laser light inculded) is used to harden the surface, a tray the part sits on is lowered and the media is refreshed And repeat. its not just let it run then build a gun either. There has to be a suport structure added to the .stl which has to be removed later. My friends in the indsutry use thier edm machines to do it as the parts don't machine well. Think of it as sand stone, you can split the layers pretty easy if you are not careful. it also has some strange surface property( simlar to how mim parts) which is also why they tend to use edm vs conventional machining. then there are the power requirements, which by the NEC no home in the us can have.