3D printing

[Gunter]

I'll bet you could make some brilliant components with a bit of thought...

http://i.materialise.com/

I don't see why you couldn't print an entire airframe with a bit of time and money!

 

[ZAxis]

Already done !

 

[Crash]

$100 quad in which some parts were 3D printed:
http://www.rcgroups.com/forums/showthread.php?t=1512227&page=2

There are also designs floating around for an entire nano quad frame that can be printed.

I just ordered parts for a small reprap. It should be fun to play with and make odds and ends.