Indeed, that does not look good. Since there are number of things that can cause this, I would recommend this troubleshooting chain:
- Of course the filament needs to be dry and the temp should be sufficiently high and stable. For PLA (only), I have found it does not matter much if the door and top are open. I prefer to things closed.
- Do a number of hex key cold pulls again. It is common that multiple pulls are needed to clean a partial clog.
- While having the hot end in your hand, check the thermal paste. If it flakes, renew. This is also good opp to check that the nozzle is straight.
- Before trying a print again, clean the extruder in case of flakes/filament dust travelling back and forth.
- While doing that, have a look at the filament cutter in case it is blunted or likes to stick.
- Check and if neccessary replace your PTFE’s, in particular to the extruder and from the AMS to the Hub/Buffer (they tend to be my personal pain points).
I hope that one or more of these points are helpful.
