I have always found fan design interesting, companies spend hours upon hours and millions of dollars trying to fine tune the design of their fans to move more are while also making less noise. Have you ever wondered why they choose the amount of blades they do. I have so I decided I would copy one of the best fans on the market and test out 2 other configurations, a 3 blade design and an 18 blade design. One would think more blades means more static pressure but is that all there is to it. Make sure to subscribe to my YouTube then head over to my thingiverse page to download the wacky stuff we make on Major Hardware. https://www.thingiverse.com/MajorHardware Useful information about fan design. “BASF Corporation BASIC GUIDELINES FOR PLASTIC CONVERSION OF METAL AXIAL FLOW FANS” https://www.semanticscholar.org/paper/BASF-Corporation-BASIC-GUIDELINES-FOR-PLASTIC-OF/bcad4b9f9b1ae1c4e9fdf89ea0717371effcc283