So I tried again today and with a little more force the end came out of the isolator and the spacer quite easily - my current theory is that there was some sort of earlier jam and that caused the feeder to grind the spot of filament it was trying to move to nothing and that's why it stopped kicking out plastic even after the jam was cleared - and why it failed to retract the filament during troubleshooting. I cut off the offending section and reloaded the filament. Printing a test run now to make sure I haven't broke anything.
It's kicking out a load of blackened crap but it's printing - running it at a high temp to clear it out...
Cheers for the help!
I think you'll have to take the teflon spacer out and push the plug out with a screwdriver.
The gold filament uses some kind of metal filler perhaps? Possibly the filament itself is a good thermal conductor, which might explain why it melted so far up.
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