Some hair got caught and wound itself around this gear, with enough heat from friction to melt the base of the original spindle. This caused it to snap off some teeth on the middle gear, which I also replaced with this part.
I had printed this one out as is, but the hex part was too small to engage the brushes I have, the brushes would just spin around the hex part instead of snapping on like the original. The original hex part measures 5.3mm side to side at the base, and this one is modeled at 5.196mm measured in Fusion, about 2% smaller. I reprinted it scaled 2% larger in XY and it now works just like the original.
Printed in high-temp PLA with detachable supports, the bottom of the gear needs to be filed smooth after removing the supports.