Interesting approach with the brush. I added a peristaltic pump on mine to pump paint or any fluid to a syringe tip on the XY stage [1]. Example with bleach pointillism to do stuff on fabric [2]

[1] https://x.com/dsp_person/status/1591146165181231104

[2] https://x.com/dsp_person/status/1593162129959686144