If we're being completely honest, we're still not sure how 3-D printing works.
It's all just a bit too much for us to wrap our heads around, so we don't actually believe it exists, so when we hear about it or see it in a video like this, there's only one explanation. It's magic, and as such, must be burnt at the stake.
But seriously, this is incredibly cool. Not only can they make functioning electric prosthetic limbs, but they're also about 30 cheaper than some of the alternatives already on the market, which is simply amazing.
