George: I have refilled inkject 3 color cartridges for the Z11, #12A1980, several times. Gradually the quality does degrade, but they last roughly four refills for mine. It is necessary to pop the top off with a razor or real thin knife between the top and the main case, but they are really easy to refill.Though it is not the same cartridge, principle is the same. Hope this helps. -vern-

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