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Put some black tape over the angled portion of the cartridge to prevent the sensor in the printer from reading it. Magically, the cartridges are now full again! Hope this helps somebody else.
Some brands leave 30% of the ink in the 'empty' cartridge to protect the printhead.
Just something to consider when analysing the costs!
whichever way you cut it the printer manufacturers really do win
How do you think they can afford to give away so many printers with new machines? ;)
I recently purchased a real nice HP all in one office jet. I got it home to find that the cartridges for my new printer are at least 33% SMALLER than my last printer and are $15 MORE than the older catridges. How nice.