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    How do printers detect the ink level in a cartridge?

    The subject pretty much says it all :) Are there sensors in the cartridge that send info to the printer?? Or Does the printer just give you an estimate of how much ink is in your cartridge???? Any info would be very helpful. Thanks the FALSE
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    Blue wont print! why????

    I tried refilling my lexmark inkjet cartridges. The black works fine and in the color cartridge the red and yellow work but the blue wont print at all. Anyone got any ideas what's wrong?? I already printed several cleaning pages and it didn't fix the problem. Any help would be appreciated.
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