Fully clogged CHT nozzle - what is the recommended way, chemical warfare or heat?
Hi,
in the old days one did a cold pull, or tried to poke into the nozzle hole with a needle to make it free from filament. However, how I am supposed to do that with CHT nozzles? My 04 brazz cht has some PLA stuck, and my poor attempts to solve the situation maked the filament breaking right above the nozzle upper end.
Any ideas?
I had to switch nozzles to proceed with printing, but dislike wasting this 4 months old nozzle.
Cheers
RE: Fully clogged CHT nozzle - what is the recommended way, chemical warfare or heat?
Maybe first try heating it up a bit above PLA printing temperatures, open the extruder idler and manually try to force the filament through by using something to push the filament down.
RE:
I recently ran into this dilemma as well. What worked for me:
Remove the nozzle and hold it with something insulated (I used some pliers).
Be careful not to burn yourself:
Take a heat gun to it for a minute and heat up the whole assembly.
Find a tiny hex wrench that will just barely fit in the top end of the assembly (not the nozzle end!).
Push the wrench in, and hopefully watch filament come out the nozzle.
Once I got much of the filament out, I let the nozzle assembly cool and reinstalled it.
Then I brought the hotend up to 260, and loaded some cleaning Nylon and let it sit a couple minutes.
If you're lucky, the clog will clear itself and you can extrude out some more Nylon. If you don't get flow out of the nozzle:
Let the nozzle cool to about 120C. Then disengage the idler lever, remove the teflon tubing, and do a pull. Repeat a couple times.
RE: Fully clogged CHT nozzle - what is the recommended way, chemical warfare or heat?
OK, thanks a lot. Seems, the new nozzle design has its downsides, too