In case you were unaware, there is some extremely awesome work going on in regard to printing high-performance parts over at the OpenRC group:
https://plus.google.com/u/0/communities/112745535856143176146
I’m still getting up-to-speed on what the current state-of-the-art is with this project, but if you’re looking for ways to make printable mechanical bits hold up to extreme stress, this is a great read.