I recently made a very nice CNC router and for the Z and Y axis I used NEMA23 style steppers. Unfortionatly these steppers get a little to hot when running long jobs. Therefore I designed a Stepper fan mount to help with the cooling of the stepper. The fan mount is designed for a 60x60x20 mm fan which is slided into the top mount. I printed it without support material the first time which was a bit gnarly. Second time will probably be with support material for the bridges ;