Interesting point, Ed - 3D printing is a very interesting and emerging "next generation" technology, with the potential to have a big impact on manufacturing and retail.
I was not aware that it was technically possible to manufacture a ocmplete gun via 3D technology just yet - only some of the parts.And I doubt you could manufacture the ammo easily. Still, it will probably inform the debate.
Where the country is awash with guns - and it is; an estimated 320 million of them - then i imagine that folks inured to the idea of armed holdups, armed muggers and armed street gangs will feel reluctant to give up the right to have a firearm for self-defence. Clanad has argued elogquently enough on AB in support of his right to carry a gun.
And, given that the constitution is regarded as a kind of religious sacrament, the 2nd amendment does pose a problem.It would take a very brave person, or movement, to consider changing the constitution, but really, nothing should be cast in stone, immutable, especially in politics, and the 2nd amendment really does need to be amended, revised or removed completely.
It is incredibly sad though that they cannot even seem to take the first step - even one that seems to be an entirely uncontroversial one - the idea of background checks.
I fear that it will take probably many more of these outrages before the momentum really changes sufficiently to effect substantive change.
Meanwhile, you have the prospect of various states authorising teachers to carry guns into classrooms, teenagers being able to carry guns into universities, and concealed carry permits for people going to bars, restaurants and nightclubs.
In the meanwhile, there have been over 3000 deaths attributable to firearms in the USA since Sandy Hook, just a few months ago;
http://www.slate.com/articles/news_and_politics/crime/2012/12/gun_death_tally_every_american_gun_death_since_newtown_sandy_hook_shooting.html