Based on the Prusa i3 Bear Upgrade feet:
https://github.com/gregsaun/prusa_i3_bear_upgrade
Added a slot to attach the original Prusa i3 MK3 rubber feet.
Attach the feet like ordinary Bear feet, then slide in the rubber feet. Kept in place by friction, no extra hardware required.
Print standing upright/on edge (with the slot like a U shape) to avoid having to use supports.
The author marked this model as their own original creation. Imported from Thingiverse.