A segmented propeller assembly for 8mm shaft. Segmented parts can be printed on most 3D printers. Shaft is locked to the propeller with a tapered locking bushing. 5-40 x 1.25" screws and nuts for assembling the hub and blades. I used 4 epoxied in 3mm rivet nuts in the top hub to secure the tapered bushing and cone. You can simply thread the four top hub holes and use 3mm screws to secure the tapered bushing and cone to the top hub. The complete assembly gives you a fan diameter of about 200mm or about 8".
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Segmented Fan for 8mm Shaft
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