This clip attaches a fan to your stepper motor, assuming your fan is 15mm wide (I used a 50mm fan for this) and you're using a typical mendel stepper motor. I've attached the Inventor files in case you want to make modifications.I know there are metal versions out there, but lacking the tools to make them, I've made this.Print, clip this bracket to the fan and stepper motor. I made mine out of PLA.