I prepared the 3D printing of a 3-blade toroid in 250mm and 10mm thick. This corresponds in overall dimensions to a classic test propeller that I have on hand.
I had to make some 3D modifications at the level of the axis of connection to the motor so that the bore corresponds and crush according to Z because by default the toroidals are quite thick!
Original dimensions of this model: 204, 202, 15 (good already it was not symmetrical
Dimensions of the printed part: 225, 225, 10
Otherwise, I haven't quite understood the direction of rotation yet: unlike a conventional propeller, it looks like it's reversible?
Good cold I would say that I printed one that will perform better in the sense trig...
The print is in progress...