I am intermittently getting lines of black ink laid down at the edge of the paper, about 3/16" thick by 1/2" long. (See attached photos.) They are very different from head strikes, which I have had in the past and fixed.
I believe they started when I changed the photo black cartridge (genune Epson from B&H) and had to do some head cleanings to fix some nozzle in the black. I have removed and reseated the photo black cartridge, but they are still happening, although intermittently. I can make 3 prints fine, and then they reappear on a print, then the next one or two or three is fine, and then they are back, and so on. They are usually at the edge of the print that first comes out of the printer, but sometimes will appear some inches further back on the print. The maintenance cartridge was about 98% full when this was happening (I have just replaced it, but have not printed since), though I don't see how that would affect anything.
I'm printing on Epson Exhibition Fiber, driver settings are paper thickness .3, platen gap wide, super fine mode, single direction printing with a drying time value of 20 between passes. Paper is fed through rear sheet feeder.
Anyone know what causes these and what the fix is?
Thanks for any help.