3D Print General had one video where I recognized an AR-15 lower being printed in the background. The voice over was on the printer or filament (I forget).

Hoffman Tactical is still on YouTube. I was made aware of this channel when researching CF Nylon. HT has several promotional videos of his 80% printed AR rifle, and long discussions about which filament to use for which part of a rifle.

It’s very inconsistent.