Simple Nema 17 stepper cooler

A simple Nema 17 stepper motor cooling duct.

This design is suitable for any axial 40mm fan.
Using 0.08 A 24V fans resulted in a 18 deg drop in surface temp on the endplate of the stepper. (results may vary based on ambient temperature etc etc)

Rev A is designed around the Stepper_Online 17HE19-2004S with a body length of 48mm.

Rev B is designed around the Creality 42-40 Stepper Motor with a body length of 40mm

Both revisions contain models with an without holes for M3 heat set inserts.
Inserts make for a tougher part. Threading bolts directly into the plastic shouldn’t be a issue.

More revisions(length) are available upon request.