These Inserts fit into the slots of schuetzi99 s anti-vibration feet for the Prusa Mini+/MK3:
https://www.printables.com/de/model/1727-anti-vibration-feet-for-prusa-mk3ss-mk4-and-prusa-
Small insert is for the standard foot.
Big insert fits the big foot under the electronics compartment.
The author marked this model as their own original creation.