In fact, my viewpoint is entirely Europe-centric. I know it's easy to order an 80% lower in the US. The whole point is that with 3d printers, even those in jurisdictions that don't have weird 'let's take one component of each type of gun and make only that regulated' laws can manufacture guns at home, with $500 worth of tools, and <$50 of materials. And no, you cannot whittle a Glock lower out of a block of plastic.

The vast majority of people in this thread are making vastly unsubstantiated claims. Claims that might have been true in the first years of the RepRap, but that certainly aren't true today. Please, before you post another reply, google 'FGC 9 Youtube', watch that, and then come back and tell me that that is not a massive shift in capabilities.

I'm not going to reply to the second part of your comment - if I'm understanding you correctly, you're saying 'yeah but if we didn't have 3d printing there would still be other ways of making guns.' May be, maybe not, I don't have a glass ball - but that's entirely besides the point. In the world we live in today, we have the internet, we have 3d printers, and in 5 years time we will have a situation in which every criminal and terrorist can make a small arsenal of firearms in a weekend, and at the same time, in most of the world, law-abiding citizens will have all their rights legislated away under false pretenses. And most people are perfectly fine with it, because 'guns are scary'. That is the real problem here.