Update: I have now uploaded slightly improved versions of the planter and tray models. The tray should now have a snug fit with the planter, keeping it from sliding around and getting off-center.
The pictured print was done in matte gray PLA, 0.2mm layer height, with the “fuzzy skin” feature enabled. Default size is 3x3x3 inches, but it could easily be scaled up or down without any issues.
If you like this design, consider leaving a tip! I'm a university student that designs planters on the side, so anything helps!