Wouldnt it be nice to draw up a design for a prototype part, in say Sketchup, or AutoCad, and just push "Print" and have it create the part for you? Well, if this sounds good to you (and even if it doesnt..) you should check this out!
http://www.fabbaloo.com/2008/11/paper-launched.html
Quote:
"The Mcor Matrix is the only 3D printer in the world that can use ordinary/used A4 paper to make 3D objects. This key technology breakthrough shatters the industry’s cost barrier to universal access to 3D printing. Infact, the operating costs of using the Mcor Matrix is up to 50 times less expensive than competitors’ current technologies."