This is a fully parametric planter saucer designed in Blender using Geometry Nodes. Instead of being a fixed shape, it's driven by eleven adjustable inputs — size, wall taper, corner roundness, rib count, material thickness, and more — that let you customize the saucer to fit whatever pot you have. The same base model can produce a small sharp-cornered square saucer, a large round flared one, or anything in between.

A few STL files are included for the saucer shown in the images for anyone who  just wants to print and go. But if you have Blender installed (it's free), you can open the source file and dial in the exact dimensions you need. The instructions below walk through how to do that, even if you’re new to Blender.

The saucer prints flat-side-down with no supports. The ribs on the underside lift it slightly off the surface so the excess water can drawing from the pot.