HP 310 Not Printing Any Cyan

Hi all, after printing perfectly on Saturday until I ran out of optimizer, my cyan does not seem to fire. I was printing a job and any blue elements were 100% magenta. I have tried swapping the print heads around with no success. Black and other colors still print perfectly. Test plots show light cyan, but no cyan. Maintenance cartridge is at 35%. New Cyan ink cartridge as of February. Can anyone suggest anything? I'm guessing a printhead, but one has 2000ml through it and the other 1100ml...I've replaced the C/K printheads multiple times since owning this printer, seems as though they do not last... Thanks in advance.

It has been known that the Primer assembly can cause issues such as this if any of the rubber nibs go missing. the primer looks like a crane above the carriage in the right side of the machine. If you use a flash light you can look in and see if the 4 fingers all have nibs. If not then the primer needs replacing and recalibration. (the nibs are not available as a separate part) Good Luck RoyK

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