Fan (V3.0)

This is a continuation of my fan experimentation that I started with http://www.thingiverse.com/thing:381529

What happened to version 2? Well, strike it up to a lesson learned with a design that didn't work nearly as well as I hoped.

This version, unlike the previous one, has a very definite directional bias at higher RPM (10K+ RPM). The top of the blades (the ones on the tapered side of the spindle) are what you want to use as the leading edge. In my print, I took another user's