It seems there could be a demand for open-source printer firmware... but I'm not aware of any projects. There are some efforts to get around cartridge DRM though, but they tend to be relatively small. I suppose one problem could be the massive number of different models out there, although from what I've seen a lot of models are based on the same mechanics and processor platforms.
On the other hand, completely open-source 3D printers seem to be a lot more prominent and successful.
On the other hand, completely open-source 3D printers seem to be a lot more prominent and successful.