content: History of the sten gun, insanely easy to make and I don't even know how personally. My understanding is I could learn how to make them in less than half a day and pump them out. I think the powers that be are worried as I don't have to learn much more than how to operate the printer. Plus throw in a decentralized network of producers and you could turn out whole armies worth of gear in short order. That doesn't even consider how mobile a 3D printer based weapons lab could potentially be.