Earlier quoted context omitted.
On the technology side, I'm somewhat hopeful because it looks like they're using off-the-shelf HP ink cartridges for this. HP cartridges embed the printhead into the cartridge itself, and that printhead is arguably the most complicated part of the entire device. Outsource the printhead, and you're just designing a plotter with a PCL interface. I agree that the bigger challenge is going to be patents. It also wouldn't…
The crowdsource page says it has refillable ink tanks rather than cartridges. Unless they are modifying HP cartridges, which is probably not smart from a legal standpoint.
The photos clearly show HP cartridges installed.