Just rubber pads for LÄTTHET regulated feet - marked as v2, because have 0.5mm deeper central part to better support feet (central bump is a bit higher than a rim, making feet less stable on hard surfaces).
It looks it should also fit Ikea EKET regulated feet - but haven't tested yet. Design files attached, so feel free to accommodate model for your needs.
Material: soft TPU (I've used F3D)
Settings: 2 perimeters, 0.2mm layer
The author hasn't provided the model origin yet.