Printer came without a part cooling fan. Remixed Walter's Fan Mount (RigidBot) fan mount to work on the Core i3. Then used the duct for the 5015 from lobocnc's MakerGear M2 blower duct.
You could probably also usethe following ducts as well, but I haven't tried them.
Or you could design your own. Whatever floats your boat.
Now the only problem is figuring out PWM control for the fan so it's not on 100% when plugged in.