Was printing Bambu PC then went to print PLA and it jammed up printing the test lines.
I have done this in the past but it was the next day when I started the PLA print so it was cooled to room temp.
This time the extruder and bed temps were only down to 50 or 60 C.
There is a fat chunk a filament in there and it does not want to come apart any further with reasonable force.
Update.
I was able to use a very small screw driver to get in thru the round hole that the filament comes out of and pry the filament up while pushing on it from the other end of the tube.
Got to to come out of the rectangular opening.
Now just need to get it all back together.
There must have been too much heat up at the top of the chamber and the PLA got soft in the tube going to the extruder.
Guess I need to move the AMS of from the top so I can easily take the top off to let the heat out faster.
I’ve got same isssues. Did it resolve your problem opening the top hat?