This is a self watering planter. Both the inside and outside “pots” should be able to be printed without support, I tried to keep all of the angles steep enough.
It is important to note that these should be coated with a waterproof resin or paint, to make them water tight. Otherwise the water will leak into and through the material causing a place for harmful mold and bacteria to breed.
The author hasn't provided the model origin yet.