The idea here is simple and charming: turn an A2L into a pen plotter and let it draw a portrait of the household cat. The maker put a pen attachment on the machine and produced a detailed black ink drawing of a long-haired Maine Coon on white paper. The subject is the maker's own pet, which makes the finished piece feel personal rather than like a random test pattern.
How it works: the machine holds a black ballpoint or gel pen in a cylindrical holder fitted with a knurled collar, and that holder sits on the moving toolhead. The pen tip races along programmed line paths, shading and hatching the fur, the eyes and the facial contours. The paper rests on a dark mat marked with grid lines and alignment crosses that keeps everything in place while the head moves. Gcode generation is handled in Bambu Lab's own suite software, which keeps the workflow inside one ecosystem.
Two details stand out to me. The grey toolhead carries the Bambu Lab text, a nice reminder of which ecosystem this runs on. And the mat carries a LIGHT GRIP label, suggesting it was chosen with pen work in mind rather than borrowed at random.
The maker points out that people rarely discuss the cutter attachment, and this project shows why that seems a shame. The maker also notes the setup allows attaching unique pens and can work on large paper plus materials like leather and fabric, unlike a normal HP printer. Whether the same results are possible on other Bambu machines is something I would love to see explored next.