Hi! I couldn't found a model that worked for my fan, so I decided to model this propeller for my cheap desk fan, wanted to go for a toroidal design.

Outer hub diameter: 40mm, Inner hub diameter: 38mm center shaft: 3mm

Suggestion: It is recommended to heat up the shaft (I used a  lighter) and introduce it in the center of the fan blade; this melts a little bit of the material, ensuring a perfect fit. When doing this, make sure to leave the shaft as centered as possible in order to prevent excess vibrations.

Doesnt require any support or brim to print