Awesome to see pen plotter stuff posted here with more frequency. This project is pretty amazing in its frugality, kudos to the author. I have another pen plotter and I'd highly recommend pen plotting to anyone who's into generative art or anything similar, it's really fun to write a few lines of code to generate some visuals and then watch the plotter as your design is made into something tangible.

I'm working on a (free) app around making drawings on your computer, putting some effects on them, and sending them directly to a pen plotter. So far it only works with axidraw because that's the only one I have, but ultimately it's just sets of coordinates so it could be adapted for other plotters pretty easily. I'll post it here once it's in a decent state :)