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 advice and sanded the blades, then hit them with some acetone. I'm not sure how much of a difference this makes, but this fan does seem to move a good amount of air.

The blades are a bit thicker, they print out a little better because of this, and they don't seem to flex as much (printed with ABS) as my previous version. There is still a bit of flex when you hit higher RPMs, which might actually be beneficial as the blades could be seeking a more optimal angle of attack. In this design