Fan-freaking-tastic

I recently found myself on an un-air-conditioned streetcar in 35C weather, and knew the solution involved melting some plastic. Voila.

https://youtu.be/WxunA_LgXp8
https://www.youtube.com/watch?v=181IDoGvFy4
https://www.youtube.com/watch?v=zS9lyGbMXlM

It's all parametric. Download and print the examples here, or generate your own fans using the included OpenSCAD file. Don't be intimidated by OpenSCAD-- it will take you less than 5 minutes to figure out how it works!

Add texture to your fan with holes (using a 3rd party application -- the exampled pictured was done in Tinkercad). Edit your own designs here: https://www.tinkercad.com/things/iQzRPhlH5KY

For an even better look, change the filament color after 0.6mm. The blades will be one color and the arms another.

Make sure you have a Bottom, Mid, and Top file for the same fan. The suffixes tell the fan's dimensions:
r = mm length of fan arm
b = % of fan arm that will have blade
a = angle (arc) of each fan blade
c