CompelTechnic

It's been possible to make AR lower receivers at home (with an equipped metal-working shop) for decades- milling it from a block of steel. Takes more work than 3D printing it, though.

The big revolution isn't that it is now possible to make your own weapons. That's been true for a long time. What's important is that it is now easier (less investment of time, money, and skill) than ever before- I think a lot of people aren't really aware that this is the change your work is bringing.

Do ya think people have a different conception of 3D printed weapons, given the fact that they are don't know it's been possible to make your own weapons for decades? How do you think they react differently?

I've got a buddy that works at a vacuum lab. Turns out that there's hardly anything that's "perfectly sealed." Leaks just become exponentially smaller the more effort you throw at them. Turns out there are a few atoms drifting through this flange every hour, a few atoms drifting through this o-ring every minute, etc.