Thanks for solving the issue with the tracks on the leading edge of the paper! Caused indeed by the grabber.
Lately a new problem has occurred and the solution most likely involves cleaning.
There are dots of black ink about 3-4 mm in circumference on the bottom long edge of the front of the paper as the paper exits the printer. Some of the black dots can also be seen on the bottom long side of the image itself.
Where are the spots issuing from, and what parts need to be cleaned? I note your warning about cleaning the bottom of the print head, etc. So, does the print head have to be cleaned? Would installing my cartridges of Piezo flush and running a cleaning cycle and nozzle check suffice?
Incidentally, the printer is relatively new and has not been used for all that many prints. In addition, a nozzle check reveals that all nozzles are printing correctly.
I am using the WN ink set with the refillable carts. When examined, I see no evidence of ink on the bottom of the carts. There is ink build up somewhere, and the ink is being deposited as the paper exits the printer-but why in drops rather than in lines?
There are no ink drops further back on the sheet of paper...always the front few inches.