People could --but to what degree of success? A gunsmith, yes, but any yobbo at home? They might fire once, they might explode.

That's why I'm putting it more like 20 years out. Eventually there will be printing technology that will provide the tolerances required for a complete gun that doesn't blow up in your face.

And the drugs - http://www.guardian.co.uk/science/2012/jul/21/chemputer-that...

And some spare organs in case of accidents involving the guns and the drugs - http://www.ted.com/talks/anthony_atala_growing_organs_engine...

And nice little chocolate things - http://www.chocedge.com/

And a new home after you destroy your existing one with the guns after binging out on all the drugs and chocolate - http://www.contourcrafting.org/

This is a very exciting future indeed. There hasn't been something like this since the home computing revolution. It's the 1970s again, and we're still at the Homebrew Computer Club stage.

Tell me about it. I went and bought a reprap. I now have a 3d printer on my desk that's priced well under a grand, that is cheap as hell to run and that is designed from the outset for making replacement and upgraded components for itself. - http://www.reprap.org

Why more people haven't bought one already is more of a mystery to me.