Several users of MoI have made use of 3D printing services to turn their creation into reality.

You may be interested in a new 3D design tool called Cubify Invent developed specifically with 3D printing in mind:

http://cubify.com/blog/introducing-cubify-invent/

Imports STEP, IGES, SAT, and Solidworks file formats.

Cubify Invent can't open mesh models such as STL or OBJ.

Exports STL only.

Tutorials:
http://cubify.com/products/cubify_invent/training.aspx

Ed