I created this unspillable* brush wash cup for my wife who cannot keep from spilling dirty paint water everywhere when painting models. Features a ring around the base for extra stability, four notches around the top rim, and two grooves in the bottom to help remove stubborn paints from your brushes.

No supports required, at least 20% infill for strength, and most importantly at least 2 walls and a decent amount of bottom layers to keep that lovely filthy liquid inside.

*Everything is spillable if you try hard enough.