We’ve posted a lot about 3D printing here on TFB since it started to make waves in the news. From 3D printed AR lowers and bullpup prototypes to metal 1911s, but how does all this newfangled 3D printing actually work? Youtuber Barnacules Nerdgasm goes into detail on how-to actually 3D print an AR-15 lower, it’s a pretty good watch. He also tries to clear up a lot of misconceptions that the mass media likes to throw around when it comes to 3D printing and firearms in general.