I just came across “ODD” through Mashable, so I hopped over to their site to check out some amazing guitar prototypes. The design company was started by Olaf Diegel in Auckland, New Zeland. He is a professor of mechtronics at Massey University, and uses 3D printing technologies to manufacture the bodies of the guitars:
The Spider 3D printed guitar was designed specifically for laser sintering, one of the common 3D printing technologies that allows for the manufacture of full strength, extremely complex parts. The entire body, including all the little spiders inside the body, was printed as a single component, which could not be manufactured any other way.
(Via http://www.odd.org.nz/spider.html)
