When swapping the nozzles from .4 to .6 and back both times the right nozzle stuck, and had to be leveraged off with a tool. I don’t see anything on either the head or the nozzle, but if this keeps happening something eventually will get broken.
I think maybe some filament dust got between the nozzle and heater and causing it to stick, so what can I use to dissolve the stuck on plastic? THe other nozzle just comes off freely like it always has.
Hey, welcome to the club 
. I believe that this is the topic we were discussing in a previous thread. It does seem like some sort of filament ooze that makes this dark tar substance. I can only get my hot-ends off by heating it to 200°C.
As for cleaning up the gunk, I just went in with a fine razor and scraped it off, might also help to heat then scrape. Be careful as to not create any large bumps that’ll offset your nozzle.
Thanks, yep thats exactly what mine is like, so chalk it up to normal for the H2D. The right gets used the most, and if PLA and PETG are anything like lasering Acrylic, the offgassing is getting up between the nozzle and plate. Guess I just need to add a cleaning routine when I change tips.
If you print PETG, ABS or ASA often, this might happen, but simply use some force (with careful direction of course) it should be able to come off anyway. One way to reduce this from happening is to simply apply some 3d printing thermal grease. I simply clean those off every time I swap the nozzles.
Finally have a use for the rest of the tube I bought to fix my PS4.
Lol not sure if it can take 350C! Better check before applying.