I read about this on a mailing list i'm on--

www.emachineshop.com

I thought it looked interesting. No, I'm not associated with them. :P

 

I think this is a repost

 

It is not easy to use cad programs unless you fiddle with it for a few days or take some classes. You would have to be pretty dedicated at making a custom piece if its more then a geometric shape and you have never used similar programs.

 

The concept is cool, but it isn't exactly as cheap as you would think. I designed the 3 bolt flange I need to make my downpipe and it was going to cost $65 and take 3 weeks to make. I emailed BMC and got it in less than a week for $14 shipped.