Mosquito - Clearing a heat creep jam easily
Although the Mosquito hot end is known to reduce heat creep and jams associated with that issue, it is not completely immune to heat creep jams. If you ever let the Mosquito's heat sink cooling reduce while the hot end is still hot, you will get a very solidly stuck filament. Fortunately, the Mosquito can do a trick that you can't with a heat creep jammed E3D. A mosquito can melt itself free if you let it heat while blocking the hot end fan.
Release idler tension so you can manually feel and move the filament.
Set nozzle temperature to your filament's usual printing temperature
Block airflow going into the hot end fan (the Noctua on left) with a piece of cardboard. This causes melt zone to go above the normal heat break region. Don't do this for more than maybe two or three minutes or you risk melting stuff that should not melt.
As the melt zone is being expanded by lack of airflow, gently try to move the filament. Eventually, the filament will move.
Push filament downward with your fingers and extrude a few cm
Do a pull / push ramming motion to fully clear plastic from above the heat break transition zone
Finally pull filament out
Let airflow go back to normal.
Your jam is cleared without taking apart the hot end, extruder or pulling PTFE tube like you would with an E3D.
I want to thank you! I had a print that broke free from the bed, and of course I hit reset to quickly stop the print since I sent the file through Octoprint and would take too long to boot up my laptop. The fan stoped for a minute and created a jam that I thought was hopeless. After nearly giving up, I decided to do a quick search and came across your post. Sure enough it worked. Again, thank you!!
Happy the tip helped someone out.
I had the is fortune to have the filament break right at the bondtech feed gears and I think the plastic is heat creep/seized up in the copper and ptfe part of the hot end. Should I just try to take apart the hotend to find out where it's lock up? Hopefully I haven't trashed the nozzle/heatbreak or the copper cold zone tube.