I've considered Shapeways and still need to wrap my head around what their terms of conditions are. I don't plan to share my 3D models as I'd like to keep them my own product (instead of making it a 3d model other people can profit off of). I'm looking into having the parts printed in aluminum to see if I can avoid casting, but I'd have to first try a few times to even see if my parts are precise enough. I'm still not so sure about having the screw hole grooves pre-printed as I'm not sure how cleanly it will mesh with the m2 screw.
If there are any parts that someone would like to see designed I'd be open to consider it. So far I have a few more that I haven't completed like the front gear box, complete spur gear holder, modern A-arms, front wing, rear wing, and other aero pieces.