I hope this rifle explodes and kills him. I understand the motivation to go and explore the limits of 3D printing. But rifles and handguns? They are useless for hunting or self defense. About the only thing they're useful is terrorism and/or dodging regulations.
Nice use of violence to drive your point that these are supposedly only good for violence...
Your logic is also flawed. You claim these are useless for hunting or self defense, but they are useful for terrorism? A "terrorist" would use these to (possibly) kill someone, yet a "normal person" can't use this for self defense (e.g., possibly killing someone)?
Also, this is a prototype. The technology will get better in time, then we'll be able to use it for hunting, self defense, and everything else.