@menherahair >how come these aren't a thing yet?
Since my friend DiffieHellman hasn't yet received the source code for the version of BusyBox/Linux used on Kyocera printers as thus hasn't yet been able to port GNU/Linux-libre to such printers.

@zvava >why are we having such a hard time adapting the same concepts to 2d?
3D printers are simpler in some way, more complicated in others.

The filament in a 3D printer somewhat large, which gives a wide range of tolerance, while 2D printers are expected to not be off by more than say 0.1mm.

You can indeed choose black filament and then install the smallest nozzle you can find to reliably work and deposit onto paper (you'll need to use plastic that can stick to paper, or apply a precoat glue layer), thus achieving 2D printing with microplastics.


Mind you, plenty of people have indeed made pen-based plotters, some of which run free software and maybe an advanced version of such will work as a freedom respecting inkjet.