There are several types of technology available that enable you to print 3D objects using a variety of materials. However these industrial or professional machines are very expensive, in the $10,000 or $100,000 range for something with usable accuracy.
Thanks to hackers & back yard engineers there is now a rapidly developing collection of amazing home brewed 3D printers using re-purposed electronics and materials.
Have a look at the this video which displays a 3D printer that uses projected light from a video projector to cure intricate shaped in light hardened resin. The build platform is raised under computer control as each layer is built until the complete "print" is formed. The level of detail far exceeds what has been demonstrated by home-brewed printers so far.
More details are available at: http://3dhomemade.blogspot.com/
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