Klein Hot Air Balloon Whirlygig

Two versions (3 as of 7/29/15) of a Klein-Bottle type Hot Air Balloon, inspired by a conference logo I designed. After seeing the challenge I decided to try and make the balloon portion of my logo into a 3d model and try to create wind blades so it would spin in the wind. Whirlygig1 has thinner edges on the blades, and Whirlygig8 has thicker edges. I used some parametric equations I came up with in Mathematica to create the model and export it as a .stl file. Cleaned up some small cracks wh