A group called Shapeways is one of the many opening up the world of 3D printing for the masses and helping to bring affordable 3D printers to people's homes. 3D printing has been around for a while but was mostly used by engineers and other specialists and not easily available or accessible to the average person.
Here's a video explaining what 3D printing is all about:
There are also numerous 3D printer Kickstarters aimed at bringing affordable 3D printers directly to people's homes. Here's one such example: