What if you needed, say, a hand tool in space? What about a hard to find part? This printer just might do the trick. Read more after the break.

The thing that freaks me out about this printer is the items don't just come out in 3d, the ones here function.  That's right, moving gears and stuff.  There's practical home applications too.  What if you lost a part for a project you were building, or they no longer made that part.  If you have an original you can kick out as many as you want.  Check out this video.