Stepper fan mounts for Ultimaker (40mm fan)

These are simple printable mounts to fit 40mm fans on the X,Y and E steppers of the Ultimaker.

I noticed my steppers became hot during long prints, so I found a bunch of 40mm fans to help the steppers keep a bit cooler. I guess being really warm reduces their lifetime.

I do not have any heatsinks, but I guess this will still help a lot.