The scroll function stopped working on our cyberpower mouse. I took it apart to find where the mousewheel went into the encoder had broken off. This is a replacement for the original with a slight improvement.  Be sure to use supports. Also I printed it slow so the 0.07" hexagon would print correctly. The clear one in the pic is the original. 

Modeled on Fusion360 and printed on Flashforge Adventurer 5M using HS-PETG