Submerge it in a jar of water. Streak you dirty paintbrush cross the lines. After a while the paint remains builds up on the bottom, without needing to put your brush into it each time, also do not disturb the water so much. This is practical and not meant to look beautiful.
Needs supports. Any layer height, but higher than usual recommended for stability.
Works fine on my Dremel 3D40 using PLA.