This is a drip tray for a Tiki Planter - the green part in the photos.
Please see below for Tiki planter models - first is my remix for easier printing and second is original.
https://www.printables.com/model/1309176-tiki-style-planter-easier-print/
https://www.printables.com/model/1301128-tiki-style-plant-holder-3d-printable-planter/
The author remixed this model.
Tray to sit under original model(s)