About this 3D model

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.