Until HP actively allows the use of third party ink cartridges, I will never, ever again buy HP products. They sell their printers cheap, but then charge almost as much for ink refills as they do for the printer. And if you refill the cartridges (even by Costco) or buy new non-HP cartridges, they sabotage the printer by screwing with the print head. This is loathsome, unethical and despicable. Until they repent this vile practice, I am done with HP.
