I made several changes to the fan blade (mk4 version).  I found the original fan wobbled a lot, and the blades scraped on the gear. I changed the diameter of the shaft from 6.0 mm to 6.2 mm, and cut a portion of the blades away. Now it works perfect for me. 

I am sharing my remake here because someone ask for the .stl file.

Thanks goes to LoboCNC for the original design in Easy Strandbeest. Please visit LoboCNC page on Printables for the compete build files.