Feeder Tension

[ASP]

What should I keep feeder's pinch roller tension to?
I have adjusted tension on my ultimaker 2+ and now I can see little marks of knurling which is present on one pinch roller.
I wanted to attached photo of filament after it goes through feeder but couldn't find option to attach. Is my tension too high ? (As it is leaving marks)

[Bikeracer2020]

It's called 'manage attachments' lower down the page where you type in your post.

[VidJunky]

So I was getting these marks and I felt like I was also having issues with my prints due to the feed rate of my filament. Like you I was getting scaring on the sides of my filament that I would notice when changing colors or filament. I ended up printing a roller setup with bearings that allowed my filament roll off of the spool more freely. I was using mostly cardboard rolls on a hard plastic hanger. I did a few other things to this printer for filament feed too, because it was eating into my filament empty sensor. I knew it wouldn't last too long if I wasn't able to reroute it. The roller was the thing that helped the most with filament flow for me.