Centrifugal fan designed to be powered by RC hobby brushless motors. Impellers are designed for EMAX 2306, different motors might require small changes to the motor holder so that correct spacings are archived.
Impellers have to be printed with support everywhere.
Also, impellers have to be balanced, they can spin above 15000RPM!
Motor holder is designed to be installed using brass threaded inserts http://bit.ly/2LDi6Il
Use M3 screws to assemble everything together