Er, one problem.... We've seen similar guns self destruct in the past. For theirs, it worked fine and test fired well; certainly a better design which takes into account the difference between a metal and plastic gun. However, I would question whether the 3D printers themselves are trustworthy enough to consistently put one together. Each model and variation does things somewhat differently, and I wonder if their design would stand up not just to the test model they printed, but also to those created with different 3D printer models, which themselves may have a wide variation of specs ranging from how well the plastic bonds to what resolution they print at. Sure, a couple years from now there will be better consistency, but with today's hobbyist assemblies? I dunno.
All that said, I'm surprised it took this long. I mean, if I had a 3D printer, the first thing I would do is create overly elaborate clockwork devices using my now-infinite supply of gears. A gun is just a few springs and making it thick enough to not explode.
Hrm... Looking into it further, I came across this: http://www.extremetech.com/computing/155490-3d-printed-guns-have-lawmakers-scrambling-but-cooler-heads-are-needed
Beyond that, what should lawmakers do? Probably nothing, for two reasons.
First, there’s the practical side of the situation. The current Liberator — named after a cheap, barely-deployed pistol in World War II — has more in common with its namesake than a democratizing ideal. Forbes test fired the thing and reported that higher calibers blew the gun apart on the second firing. Another video shows the gun surviving 10 shots, but dying on the 11th. Misfires are common and the weapon currently requires an $8000 3D printer.
So that seems to confirm my suspicions about the required printer quality.
I'm suspicious about where he heard that it required that particular brand of printer.
And the problem this type of weapon presents isn't mitigated by being unreliable over multiple shots. Killing someone only requires one. Police forensics rely tremendously on being able to prove that a bullet was fired by a suspect's gun. When you can grind the weapon to dust in a matter of seconds in a tough blender, or hell, burn it, that's a bit of a problem. This, plus the cost of the materials concerns me. The writer seems to forget that you don't need to spend $8000 on each gun, probably closer to $10, if that. Not to mention that this is the first printed gun, ever, and it would be strange if there
weren't improvements to be made.
You're both still thinking of this in terms of home invasion - what you should be worried about is an escalation to civil war. It has happened, it can happen again, no matter how much we think we value peace, people can easily be driven to desperation by violence. The government needs to think very carefully about how it responds to this kind of thing, in particular with what they're willing to do to its citizens to suppress it when the damned things do start getting use.