In my case, 3D printing is done with a design program called OpenSCAD and the Lulzbot printer. See some of my notes: http://runeman.org/3d/
@Algot Nice work. OpenSCAD is sexy. I used it for a while back before for 3d printing. Later I ended up using Rhino 3d mostly though.
@proto Thanks. I'm just settling in with 3D printing. Having way too much fun.