I mostly agree with you but there are some caveats and it varies by location in the US. [1] While I am in one of the most firearm friendly states I will personally avoid 3D printed firearms until the federal and state laws are more clear and aligned. Aside from the legal ambiguity aspect I would want something battle hardened and pressure tested that I know won't blow up in my face.

[1] - https://www.criminaldefenselawyer.com/resources/state-and-lo...