this is an internal gear for the accessory port (ie, meat grinder) on the costway stand mixer:
Costway model SM-1501BM / EP2464SRE (https://www.amazon.com/COSTWAY-Tilt-Head-Upgraded-Electric-Stainless/dp/B0831CVGFB)
ours broke and no replacement could be found
printed in PLA for now, but if that doesn't work I'll have it done in stainless, now that I have the model
The author marked this model as their own original creation.