Comment by mindslight

Or just use an FPGA. They're not really that hard. Just different from the open hardware community's usual go-tos and the tooling can be kind of crappy.

I've often wondered about an open printer design. My current printer uses inkjet cartridges which contain the print heads (HP 45/78). That would seem to be most of the difficulty, already made available in a commoditized off the shelf package.

I've heard paper picking can be kind of a black art, but I'd think a community could iterate fast enough to get it at least passable, or just suck it up with single sheet feeding in the beginning. And it's not like commercial printers are foolproof.

Then there's motion control, which is already the bread and butter of the 3D printing scene. Perhaps not initially good enough to align 600dpi over multiple inches repeatably for photo quality, but I'd think it would be fine for business forms and whatnot that people end up having to print.