I think those 3-D printed guns might get a lot more problematic for countries like in Western Europe, than in the US where guns are omnipresent and where the worst issue from what I read would more be an issue of traceability...
Might be. Then again, the problems they'd be having in Europe are problems here stateside, we just kind of deal with it and keep our heads down (sometimes literally).
They may not be cheaper now, but they might be in the future. To a 3d printer, there's no difference between making a spatula or a gun, just the cost of the raw resins and plastics. So, essentially, a gun could end up being no more expensive than anything else. That might put people in the same boat we're in here, where I think knife crime is still a more prevalent problem in Britain than gun crime.