I was printing something with PET-CF, and everything was going well.
I got a message that the printer had finished, but I found the project stuck between the left nozzle and the position where the nozzles return to home.
After removing the print, I saw that the left nozzle was completely covered in PET-CF.
I reheated the nozzle to 230°C and managed to remove most of the PET-CF, but I also discovered that a wire had come off!
Looks like I’ll need to order some spare parts.
I’m relatively new to 3D printing so I’ve only used PLA and PETG. I found this resource when I was researching it:
Perhaps there is something there to give you an idea of what went wrong.
Contact support. That’s the nozzle tip being pushed out of the throat. There are countless examples of this happening on the H2D. They should send you a new nozzle and heater. Send them the photos and explain what happened. Upload the logs in that same ticket.
No. It was not pushed out.
I removed it myself.
Not the actual full hotend, just the tip. Those blobs occur when the either the tip becomes partially or fully dislodged from the throat (they are pressure fit) and filament extrudes out from the throat around the tip.
Its possible that a blob developed because of nozzle scraping and the nozzle itself is fine. Have you cleaned he mess off the nozzle to see?
The nozzle cam is supposed to catch these things before it gets to this point. I wonder why it didn’t
So what does the time lapse show?
I had that happen on the right when a part let go from the build plate and just rode along stuck to the nozzle while the all the flow went vertical into the heat sock.
This can happen at anytime, just wondering why there is no type of sensor to detect build up under the sock and stop the print before taking out the heater?
If filament starts accumulating on the nozzle while printing with carbon fiber filament, try a Z-offset some carbon fiber filaments perform better with a slightly higher nozzle distance.
Small update.
Bambu sent me a new hotend heating assembly (thank you, Bambu!), and today I did the changeover.
Wow… a lot of work — and in the end, I only had one small screw left over! 
I have no clue where it should go, but the printer seems to be working fine for now.
I think this is the screw you’re holding in your hand. And if that’s it, do not over tighten it as it’s going into plastic threads
Wow… You’re good. That was the place for the screw. It looked like something was already in there.
