Remove large filament blob on hotend/nozzle after botched print
We ran a print job overnight that unfortunately had an issue with poor bed adhesion. Now we have a large mess of filament that is dried on to the hotend/nozzle.
Is there any way to remove this gunk? Perhaps by trying to melt the plastic? I tried heating up the nozzle but got an error message that it's not able to meet the desired temperature (perhaps the thermometer is covered). I also watched this video.
Or is my only option a replacement? Which part would I replace? The fan looks fine so would it be the fully assembled hotend?
You have a first class blob of doom. Search for blob of doom to see how others have dealt with them.
Before doing anything, look at pictures of a clean extruder and note the position of the rather delicate wires that are currently hidden, if you damage them you will have to buy replacement parts as broken wires can't be rejoined.
You have probably damaged your fan shroud and will need a replacement.
To remove it:
Raise the nozzle temperature to the printing temperature for the filament in question and allow it to heat for several minutes.
If you are lucky you will be able to prise the blob open - more likely you will need to add heat from outside with a heat gun to aid the softening, sometimes it's worth using a soldering iron to carve chunks off the mass.
Use needle nosed pliers to prise this away; remove it in parts if it won't release the wires.
Once you have the worst removed you decide whether you need to disassemble the extruder to get at all the blob or perhaps you can clean up in situ.
After the cleanup there will be overcooked filament inside the nozzle so at least a purge and probably a cold-pull will be necessary.