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

[rajhlinux]

I've also included the printer's nozzle print check test page and alignment as well.
(Please note I did a test alignment twice and printed both sides of the paper, it is why there is a shadow overlay):

 

[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

 

[PeterBJ]

I think the spikes may be caused by a media/ink incompatibility?

Transparency foil for inkjet printers have a coating similar to that used on photo paper. Using a Canon MP990 I printed the layout on 4"x6" photo paper with plain paper setting and photo paper setting. The plain paper setting causes pigment ink that is unsuitable for photo paper to be used and the photo paper setting caused photo black ink to be used.

The prints resulted in layouts size 48x83 mm. Is that the correct size?

Here is the print with pigment ink, note ragged or saw tooth edges:

And here is the print with photo black ink:

 

[The Hat]

Please try it again, here is the original PCB PDF file which I've attached to this post, scan it after printing since it would be very difficult to view by the eye without microscope

It was way past my bedtime, so I decided to wait till today to reply.
I printed them both on high quality photo paper on the best setting..
The first image is same size from the PDF..

The second is the PNG enlarged…

If this helps any ?..