Could it be printhead(s) out of physical alignment / carriage bent crooked / head raised to high due to some mechanical issue. On Mimakis lowering a head sometimes helps. Your indicated on banner it's better - banner is thicker so the head gap is less
On banners on this machine we have to set the head height to 2.5. The head height for adhesive is 1.6. Carriage rod was removed and checked. Also all rip software was bypassed with a prnt file that was built by Epson to eliminate any rip software.
2 new heads. New head caps, The head carriage was adjusted by the last tech with feeler gauges ( thats a crazy process if you ever get to watch it lol )
I have had multiple techs here from Epson one seemed to think that it was not putting down enough ink but my banding is dark not light. Even if you adjusted the amount of ink saturation i dont think it would effect the banding .
The file built from Epson uses a specific paper, specific temps, No rip so eliminates a lot and they had a couple files to print.
I am at a loss at the moment. When my tech left yesterday he was overnight prints to Epson engineers to see if they have a solutions. The other crazy part is that head 1 prints almost perfect head 2 has more noticeable banding.
Now i do need some help. does anyone have a image of where they have canceled a print to show the passes at the end that have not had all the passes done for the print? Prefer 12 or 8 pass. i want to compare.
And am i right 8 pass would bean it takes 8 passes of material in each 1 inch of material. Same with 12. 12 passes of material to cover a 1 inch of material?