The blob I saw was on the second from top. If there were melting marks, that could also be a problem as that could be where the buildup started. It is a runaway affect when it happens.
The melting marks could be from the plastic blob getting dragged a bit over the surface of the print.
Usually when this happens, it is because a part of the print has come loose and slid around right up under the nozzle, leaving nowhere for the plastic to go but up and into the printhead.
I see a big white blob on the rear left of the printer. That would be enough to create that issue and start a chain reaction from core 1 into core 2. Were the circular parts loose as well?
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