Brush designed for an emergency, work at home or to work with children. Although the quality is not that of a commercial brush, I have achieved great quality in the final product if the instructions are followed correctly. If printed on pet-g, it can be used with solvent paints. You can also try printing on different materials like Nilon 6, tpu etc.
I hope it works for you and gives you many uses. I hope you like it :) I really have a lot of work to do it, regards, thanks

Print instructions

This brush is designed for use with a 0.4mm nozzle in 0.13mm layer and 0.3mm first layer in PETG only for use with solvent paints. 4 perimeters and 30% infill, SPEED 60mm / sec and most importantly, a motorized layer fan for bristle bridges. be careful with the humidity of the filament because it can make bubbles that cut the bristles of the brush.
You can try other materials.
It works very well. I had a hard time creating a proper and functional design, I hope it will be useful to you in quarantine :).