Seed stopper feeding bowl rim.

thingiverse

A snap-on rim, sized at 3 (4.75" diameter), is compatible with parrot feeding bowls. This rim ensures that seeds aren't scattered, even if a parrot consumes it. The rim can be customized to various sizes using CAD lathing of the attached profile. Simply cut out a thin section for easy snapping onto the bowl edge. (Note: This design requires supports for inner groove printing.)