Fan for Nema

So bought and setup another printer... a Prusa i3. Seems this extruder runs sooo much hotter than my hack printer so quickly knocked together a fan shroud to run a 30mm fan against the motor.
When you print, keep an eye out for thin walls.
This is designed to fit a 30mm fan and just slip over the back of the extruder motor (using a charlestruder) for any extruder where the back of the motor is fully exposed.
Fits Nema 17.
Air hits the motor and is then distributed along the sides of the moto