Post 2

3D printing is in the process of replacing rapid prototyping, which uses manufacturing technology to create physical objects. 3D printing is better because it can be done faster, cheaper, and more effectively.

example of a rapid prototyping machine

Sources:

http://en.wikipedia.org/wiki/3D_printing

http://en.wikipedia.org/wiki/Rapid_prototyping

http://www.five-star-plastics.com/images/photos/rapid_prototyping2.jpg