I am having trouble with my epson 3880. I have two of them and I am having the same trouble on both printers. I flushed the printer with Piezo Flush, and did a Print test with the piezo flush. The print pattern printed fine with the Piezo flush. Then I installed the Piezo DN-K7 inks and and ran a power clean, but no matter what I do I can get a complete print test. I have cleaned the heads with a paper towel (as the instruction video shows) with Piezo flush. At this point I am just wasting ink. Dose anyone know what else I can do?