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Nozzle clogs during filament change
Hey folks 
I recently swapped my 0.4 nozzle to 0.6 volcano my rapido UHF hot end. Ever since I’ve had occasional issues during filament change; maybe 1 in 3 ends up with a clog in the nozzle. The filament unloads but I can’t feed the new filament through. Using a needle through the nozzle doesn’t unclog it I have to drop the hotend and use a needle in the top, I usually get a ball of filament out on the end of the needle then I’m all good, but doing this mid print is no fun!
The only difference I’ve noticed is when I unload the old filament it comes out fairly clean, so no blob on the end. I’m fairly sure when I get a clean change with no clog the old filament comes out with a small glob on the end.
Any ideas? I unload using the RatOS macro at printing temp (so 250 for my PETG). Thanks
I recently swapped my 0.4 nozzle to 0.6 volcano my rapido UHF hot end. Ever since I’ve had occasional issues during filament change; maybe 1 in 3 ends up with a clog in the nozzle. The filament unloads but I can’t feed the new filament through. Using a needle through the nozzle doesn’t unclog it I have to drop the hotend and use a needle in the top, I usually get a ball of filament out on the end of the needle then I’m all good, but doing this mid print is no fun!The only difference I’ve noticed is when I unload the old filament it comes out fairly clean, so no blob on the end. I’m fairly sure when I get a clean change with no clog the old filament comes out with a small glob on the end.
Any ideas? I unload using the RatOS macro at printing temp (so 250 for my PETG). Thanks
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