But as part of the system, some of these printers obstinately refuse to print more pages even if ink remains inside, meaning you've no choice but to toss perfectly good ink. These use a chip that's similar to the Epson models. Some other printer makers build the printhead directly onto the cartridge, so there's no risk of permanently damaging the printer once ink runs low. Once ink levels fall to a predetermined level, a beam of light bounces towards a low-ink sensor, which again triggers an on-screen message that tells you to replace the cartridge. Each printer uses an optical sensor in which shines a light through a prism at the bottom of the ink well.
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