Epson Artisan 835 - What are causing these microscopic line streaks?

[rajhlinux]

I'm starting to think it could be a print head nozzle issue, although the nozzle test print shows everything is ok, but at the extreme precision realm, one nozzle is giving extra ink at a systematic pattern vertically. Not sure what is the best way to resolve this. Maybe I could try using different ink channels and fill it with black ink.

 

[Ink stained Fingers]

I'm using an L805 which is basically the Ecotank successor of the older R285 and additional combo models with this print mechanism - 6 colors and 1.5pl min droplet size. I don't have the RPM option anymore in the driver - only a 'high' quality, but this delivers as well 720dpi data to the printer as per indication in Qimage.

MY scan does not show any spikes , I would need to reduce the ink density a little bit since the dot gain is too high and almost covers up the gap between the tracks - but this is not the subject of discussion. You might need an ink with higher black density but reducing the contrast to reduce the dot gain.

https://www.farbenwerk.com/?a=1084&lang=eng

Farbenwerk proposes as well to fill all ink channels with black ink, but I don't have any experience with PCB layout printing