To be fair, usually (absolutely not all the time), it’s idiots who want to do something dumb like this. Idiots can just download pre-engineered weapons and hit print. It takes a lot more thought to manufacture a metal weapon. So that takes out a huge barrier to entry.

Centepides actually only have 6 legs. You can see the six real legs if you look closely at a picture. The other “legs” work like legs, but are not actually legs.

Yup, just asked my fiancee, as she majored in printing, and said basically exactly this.