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The open-source, DRM-free Open Printer shows off a working prototype
(www.techspot.com)
This is a most excellent place for technology news and articles.
Aaand its dependent on HP print cartridges. This is a hard problem but the dependence on HP will probably backfire
But you can just refill those yourself. The biggest problem with HP printers is that it times out cartridges, even if there's ink left.
From what I can tell the print head is built into the cartridge and that's the hard part for printer technology.
But I think you might be right depending only on the hp cartridge will open them up to cease and desist. If they make it also use a cannon cartridge that also has a print head then I think they might be ok