Plotters are addictive and lovely - look for #plottertwitter on twitter. I've always loved this spray painting printer (poor quality video, unfortunately): <

Plotters are addictive and lovely - look for #plottertwitter on twitter. I've always loved this spray painting printer (poor quality video, unfortunately): < https://youtu.be/V4aXw0Zotzw https://youtu.be/V4aXw0Zotzw > The people that made AxiDraw also helped put together a kid's kickstarter plotter "Sylvia's Watercolor Bot" which is fun. They also have a plotter that draws on eggs... I don't have an AxiDraw, but I'd be willing to bet the differentiator from homebuilt is the rigidity of the platform and being able to get very consistent results. (Personally, I'm a fan of 80s pen plotters from HP and Rolond.)