There is a complete one piece fan, you can try to print it using a SLA/SLS or other advanced printing method. Also there are separately rotor and blade files, It's the best option for FDM printers. For complete one fan, You must print 18 blades preferably in vertical position, and glue them to the rotor. Its diammeter is 150mm.It is intended for 3d printing and use only for have a curious/decoration piece, I don't recommend to install it on a motor, It could be very dangerous.Enjoy!