Centrifugal fan aka impeller blower aka turbo fan

thingiverse

Centrifugal fan engineered for seamless integration with RC hobby brushless motors. The impellers are specifically tailored to accommodate EMAX 2306 motors, but slight modifications to the motor holder may be necessary to achieve optimal spacing for other motors. To ensure successful printing, support structures must be applied throughout the impeller design. Additionally, meticulous balancing is crucial, as these impellers are capable of spinning at speeds exceeding 15,000 RPM. The motor holder features brass threaded inserts that facilitate effortless installation - a resource can be found here: http://bit.ly/2LDi6Il. M3 screws should be used to secure all components together.