I tried the external clean method in accordance with your video but it did not clean both the Cyan and Magenta nozzles. Ink is very expensive and I’d flushed hundreds of dollars of ink already into the maintenance cartridge over the last few months so I thought I would buy a set of refillable carts for my Epson 3800 and fill them with PiezoFlush to clean my print head. Initially the Photo Black, Light Light Black, Cyan, and Magenta carts were not recognized but after some adjustments to the Black cart it is recognized and at times the Light Light Black will be recognized. I if the Cyan is pushed in hard and taped in place the Cyan will be recognized but the panel and driver read the carts as empty. I will restart the printer and then usually the Light Light Black, Cyan, and magenta carts are no longer recognized. The best I’ve seen is only the Magenta cart not being recognized. I can push in on the Cyan cart at times and then all carts will again be recognized, but will show as empty. I’ve tried the gaffers tape to the bottom and tried a different Cyan chip from an Epson ink cart, but still no joy. Now if I put all original cart in the printer the Light Light Black, Cyan, and Magenta carts are not recognized. I checked the contacts in the printer and they appear to be undamaged or bent. I have checked the three small plastic tabs and all seem good. I’m at a loss as to what to do next.