You can use ink bottles for a number of refills before they foul or fail; refilling is fine, but those piezo heads don't last forever. Wanting nonproprietary inkjet heads will never be feasible, which is honestly why I had discounted the whole project. An inkjet is a wrapper of barely complex tech around a super complex printead.

It's like saying you're going to make an open source car, they going well, except the motor, you're going to need an engine out of a 1997 honda-civic to make it work.

As long as the heads are availalbe from HP, and they don't go nuts on pricing or some soul in china is willing to sell copies it'll work. That's just not the normal far for and open device.