OK, fair enough, but a lot of the issues are the same. In fact, 2d printers have much higher precision requirements than 3d printers. 300dpi is hard to achieve, and that’s not even particularly impressive by modern standards. Aligning color heads is even harder. I have my doubts about a FOSS project ever being able to do that, unless it’s somehow crowdfunded to bring in existing experts.

Now, a FOSS plotter should be doable.