It’s a step in the right direction. We need this technology to develop further though. Eventually, affordable 3D metal printers will come around and then they’ll truly have something to worry about.
Yes. And I applaud the freedom we should have to do it. That said, there are many ways to make a gun given a few simple machines. It all depends on just how stealthy you want to make them. That’s where it gets tricky.
Use the output as a model for sand casting. Then cast the pistol frame in a home foundry. That is quite doable.
The output does not pass through metal detectors but functions well.
Look at the number of people who take an 80% AR lower and build their own weapon. It is not cheap, but it is done every day. And in most places is perfectly legal.