NSTG8R
Elio Addict
well, the feds got kinda snooty about the printed gun stuff so thats not all that popular any more but still cool!
The "Gov" gets snooty about anything they can't tax or regulate (dang...don't get me going on that!
Not sure if anyone's interested, but there's a FANTASTIC 3D CAD program called "FreeCad". It's open source (a.k.a. - FREE!), has lots of tutorials for people new to CAD, and has most of the parametric modeling capabilities as some of the $3k per seat software used by professionals.
If you're retired and curious, or not, and just have too much time on your hands
http://freecadweb.org/