After a day playing around in the Interactive Parametrics seminar I came up with a little suite to make STL's based on simple rotated geometry. The program doesn't make allowances for internal geometry, so it might print with unintentional infill. Take it for a spin and let me know what you think.
Download all the sketches, load it up in Processing, and hit "S" when you come up with a model you like. The suite will save an STL in the same folder as your sketch.