For people who don't know about 3D printing http://en.wikipedia.org/wiki/3D_printing
I'm a Mechanical Engineering student in Richmond, Virginia. In class recently we've studied 3D Printing. Its an amazing piece of technology and it's becoming cheaper and cheaper to use.
We were shown an example of a 3D printer used in Afghanistan by the US Army to create new tank parts that broke, straight from raw steel. Then the same machine was used to create new forks for the mess hall!
Knowing the VW and Audi community, my question is how willing would people be to pay more money to have customized parts for their cars? Can you imagine having wheels that you designed yourself, color, size ,spokes, and design. All original and one of a kind!? Personal engravings and such, really what ever you wanted. Custom/replacement engine/car parts. You could customize body parts such has valence's and spoilers, side skirts, anything.
This is part of an assignment and research I'm doing for class, after going to H2Oi 2012 I'm sure there are some people who would be interested in this. Let me know your thoughts and if you would be willing to pay more for wheels, parts, etc. for you car! Throw out some more ideas as well if you want!