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Printer : Kobra 2 Neo
Turn nozzle temp up, sometimes the temp reading isn't 100% accurate (have the same printer)
Just run a test around the upper recommended temp on the spool and also having hotter baseplate by 10 degrees or so can help.
Many things. I would check in this order.
Do you have the right nozzle, or is it worn out.
A severely worn nozzle will cause that.
Printing with a 0.6mm nozzle and slicing with 0.4mm will cause that.
.Underextrustion. Is there a blockage in the system.
Is the tube to the extruder moving well.
Is the PTFE tube between the drive and hotend okay (not damaged)
Is the nozzle blocked (for example, you were printing air, filament can burn to the nozzle)
Under or Over temp. Under, too hard to extrude. Over, heat creep can cause the filament to soften too far up and squash rather than push out. This obviously leads into, make sure all your fans are working.
.Wet Filament, this is less likely as it looks consistent on both colours, and I don't see bubbles. But see what a new roll prints like.
.Printer/Slicer Calibration, reset everything to defaults, firmware and software. use the factory slicer and default settings, and see if issue remains.
Underextrusion.
Could be too cool, or possibly a partial clog or binding in the filament path.
Have you done a temp tower with any of your filaments.
I would say heat and filament issues. Most likely filament. I just had a similar issue and the filament was wet.
Filament wet, is it brand new?
Have you taken the hotend apart and checked out the PTFE tube in the heatbreak? It might be cooked at the base where it contacts the nozzle causing it to pinch the filament and under extrude.
Could be filament, nozzle temp, slicer, retraction rate, flow rate, check to see if the file is manifold, could be a bad file.
sometimes the nozzle gets a lil hungry and munches on some of the filament as it comes out
in all seriousness though, what everyone else is saying is great advice, to test the nozzle, you can try pushing some filament through it while its hot and clean, it should come out in one straight strand, if the nozzle is clogged or badly worn, it will come out curly.
Thoroughly clean the nozzle tip before. A dirty tip will curl filament even if the nozzle is not clogged or worn.
A list of things if you didn't fix it respond n lmk I'll help
How’s your Z offset? Have you tried lowering it
Looks like wet filament to me. Guessing it's older and has not been humidity controlled.
Z offset is too high, need to lower it until you get some squish in your first layer. Should have 0 gapping and lay pretty nice.
Not having bambu
Not hot enough.