Designed to keep sharp edges of furniture from scraping the floor. It has a 4mm deep pocket with 1mm clearance around for the leg to sit in. This should scale to fit most other size applications.
I use three perimeter walls and 80% infill to help reduce creep because I used PLA. After several months I have not noticed any changes, but if I printed it again, I would use another material, probably PETG or ASA.
The author hasn't provided the model origin yet.