I accidentally broke some blades of my 40mm fan.
So i created these replacement blades to fix it.
The 9 blade version has curved blades.
On my fan the 6 blade version creates a better airflow.
Inner diameter is 25mm, it is designed to press fit onto the rotor.
It is designed to be printed with a 0.4mm nozzle.
Slice it with 2 perimeters.