3DPrinting

In my experience the hole that the thermistor goes into isn’t in the path of the filament. So probably what’s happening is either the nozzle or the tube that screws into the other side of the heater block is loose, allowing melted plastic to escape through a place other than the tip of the nozzle.

After you’ve cleaned it out, what I like to do before running filament through again is to turn the hot end on, let it come up to temp, then tighten the nozzle a bit more. The joint expands when heated so even if you’ve got it right at room temp it can still need tightening at the working temperature.

That's filament leaking out, if it's coming through your thermistor that's a sign that your thermistor might be loose or something? You might need to disassemble, clean, and reassemble your whole hot end.

Remove the rubber boot. Is it clean or covered in filament? My guess is, as others have said, the nozzle is loose. It should not be snug against the block but against the other feed pipe. If filament oozes out the sides of the threads, it might get pushed around the inside of the boot and come out the holes in the top.

I didn't know but it doesn't look good! Is it the same color as the filament you have in?

Pre jizz

Blood of the ghosts inhabiting your place. You need to call a priest to have an exorcism and make sure your start wearing 3 full cloves of garlic around your neck until it is performed. Good luck, man. Stay strong.

I would stop using it for now and replace the extruder if I were you.