stepper motors running hot? print this! designed for Nema stepper motors with 42x42mm using a standard 60mm fan no support material necessary mount the fan with wooden screws or use double sided tape (no snap fit due to various position on your printer!)double side tape for mounting mirrors (the one with 1mm foam in the middle..) works best! the downloadable stl file is the improved version of the one shown in the screenshots: improved geometry of the side facing the stepper motors