What I hear the most of skeptics of 3D printing are things like, "Yeah you can make little tinkets, but how about items which are actually useful," or "3D printers are just toys, you can't make anything at home that's actually practical, which will save you money." Usually the people making these remarks are misinformed about the technology in general, but it's easy to get misinformed.

Well, here is an extremely practical use to 3D printing. It's the making of pipe connectors. What happens if you are running pipining and the usual 45 or 90 degree angled connectors won't work the most efficiently? Just 3D print your own custom connector. Check out some of the pictures below. What a great way to use a 3D printer: