How is your third fan doing? The one on the backside of the printhead. It should be spinning as soon as you power on your printer or when the nozzle reaches ~40C (depends on the age of your mainboard).
Fan appears to be fine
I'll think you have a coupler that's collect filament (as a ring) in between the bottom flat of the coupler and the upper flange of the heat block. I have had only one grinding of filament at the feeder, and this was the cause of my problem!
This ring will build up, and become a solid barrier for the filament feeding system.
As I see some black colored remains at the bottom of the coupler flange, this tells a story.
Here's a magnified picture of your coupler:
Welcome in here!
When I look at your pictures, I think this is not a very much squeezed first layer. Say so because first layer always give high pressure at the nozzle. In your case, the pressure is very lo..
So this one probably is the coupler, the withe device just above the heat block in the extruder. This coupler will over time shrink and have less diameter due to temperature and compression.
So first question; during normal print, how much does the nozzle temperature variate in Celsius? Normally, if your printer is good not more than plus minus 1 deg. Celsius. If this is normal on your printer or just close to this, just continue to next point..
Since you say your filaments is grinded the "only" place to look is at the coupler for reduced diameter that will (most often) stop the filament moving further.
This coupler is a known issue for this problem.
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