One more pretty cool model to print. The helix shape prints very nice in FDM. I printed in ABS.
It is NOT a working R/C propeller, just a model !

Credits for the model: David Dearing - USA
Took it from Grabcad

The model is in full scale (~1780mm length).
I have scaled 0.13 to fit diagonally in my prusa HBP.
No support needed.
Takes some time to glue the parts but the model is very cool !
Use Cianoacrylate. Glue the tips before, in order to keep precise references.