These are the STL files for my remix of this customisable centrifugal fan. The main change is to add some places for screws to hold it together. The hole on the fan, as well as the screw holes on the case are measured up for a 540-sized electric motor. Specifically, I used a brushless motor which is common in RC car racing.
Video of it operating: https://www.youtube.com/watch?v=t20eLPCcIVY