3-D printing techniques allow for the manufacture of weird and wild guitars that couldn't be built via traditional methods. The Spider 3-D printed guitar (pictured) is one of a collection of aptly named ODD Guitars by Olaf Diegel, a design engineer and professor of mechatronics at Massey University in Auckland, New Zealand. According to Diegel's site, the 3-D printing method used to make ODD guitars is called Selective Laser Sintering (SLS), which spreads a thin layer -- usually 0.1 mm thick -- of nylon powder to slowly build up a component, layer by layer. This technique allows customers to customize their guitars in (somewhat) economical fashion. The typical price for a Spider guitar is around $3,000 (U.S.).