Centrifugal Fan 12 v

thingiverse

Hi! This is a straightforward 12VDC centrifugal fan with backward curved impellers - remember to get the polarity right for maximum airflow and efficiency! To further optimize efficiency and reduce noise, opt for a motor with 6 stators; I use one with 4 stators and it still works great, albeit a bit noisier. This produces roughly the same air flow as a hairdryer on low setting. Next, I plan to add a bell inlet to take efficiency to the next level. Stay tuned for updates! I sourced the motor from Princess Auto, but had to drill out the hub with a Dremel to fit the impeller onto the shaft. The bottom plate is particularly thick while the shell is thinner, saving on printing costs. Three screws keep this fan together; if your motor mount plate is warped, you'll encounter issues with the blades hitting the casing. Enjoy! 2018-02-05 UPDATE I've added a transition piece for 4" circular ducting and also optimized a bell inlet to minimize intake losses, resulting in a marginal CFM improvement. The fan has been tested using a vane anemometer, yielding at least 30 CFM (although there might be some leaks as I checked outlet flow running through a solar air heater I built!).