This is cup stand made from a photo.

I've noticed similar and free model is available here: https://cults3d.com/en/3d-model/home/celtic-tree-of-life-drink-coaster-version-2 but I wanted to do it myself.

UPDATE: I've fixed the model by scaling individual vertices on the bottom by Z axis - so there are no longer holes on first layer after slicing - see models with "-fixed" suffix.