If there was a 2D equivalent, I'd be interested in tinkering with that, too. And yes, that would probably mean spending 5x ot 10x more than a cheap commercial printer to get a printer than underperformed said cheap commercial printer. But it would be mine, and I would understand it, and be able to mess with it. And fix it if it broke. And use weird inks with it. And so on.
You can probably adapt a printhead from a printer to your 3D printer today if you want a crappy DIY 2D printer and go from there.