I think pen plotters are really cool! There's a bunch of models on 3d printing websites like this one: https://www.printables.com/model/573473-pen-plotter-core-

I think pen plotters are really cool! There's a bunch of models on 3d printing websites like this one: https://www.printables.com/model/573473-pen-plotter-core-xy https://www.printables.com/model/573473-pen-plotter-core-xy