Included the SOLIDWORKS File for the rotor and for slightly longer axis. I use brim with no clearance inside and outside but you might not need it. Prints very well in PLA on a Bambu Lab P1P.
Many thanks to Meister Edel for the original model.
https://www.printables.com/model/394700-toroidal-rotor-4-strong-flying-propeller
Completely unrelated: The Vertical Decor Collection:
Also: