3D printed toroidal fan

It works on a AAA battery and uses a small 12mm x 7mm DC motor.

Here's the print file on Thingiverse:
https://www.thingiverse.com/thing:5844690

and on printables:
https://www.printables.com/model/394124-toroidal-fan

Видео 3D printed toroidal fan канала Julius Howlett