I presume this means complete disassembly of the print head, so the nozzle is on its own? Then hold with pliers? Not sure I trust myself banging a super heated metal object down on my desk
How can I clear a completely compacted nozzle?
If you are going tear it down anyway, you might want to think about doing upgrades/maintenance while you have it apart.
Check the PTFE Coupler, it might need to be replaced. I had a nozzle clog once that wasn't a nozzle clog. The filament was jammed in the worn out PTFE coupler.
https://ultimaker.com/en/support/250-disassembly
Look into buying an I2K Insulator. This should make the PTFE coupler last longer.
https://ultimaker.com/en/community/17279-i2k-insulator-duptef-couplers
Look into upgrading to the Olsson heater block. This will make clearing nozzle clogs easier, but it won't help with PTFE coupler clogs.
Be careful overheating PLA. It might "caramelize" it and make it worse.
How long do the PTFE couplers last? I think this printer has done a maximum of about 70 hours.
I replaced it and I now see what the problem was. The filament and melted nicely, but from pushing new filament in to do atomic cleaning it must have forced melted filament back up the PTFE coupler. Once the unit cooled down it solidified in the coupler, so no amount of pushing would push the hardened filament back into the hot head.
How long do the PTFE couplers last? I think this printer has done a maximum of about 70 hours.
As with everything, it depends.
My understanding is that if you are printing below a certain temp, it will last indefinitely. But if you go above a certain point it starts to degrade.
https://ultimaker.com/en/community/12805-lifetime-of-your-ptfe-coupler-poll#featured
https://ultimaker.com/en/community/17587-dont-throw-away-your-old-um2-ptfe-coupler
https://ultimaker.com/en/community/17279-i2k-insulator-duptef-couplers
Read through these.
Great links, thank you! Unfortunately I had to severely deform the coupler to remove it. I'll chalk that up to an important lesson.
I think in future after I do a long print, I'll extrude a little material, just to ensure there isn't any left over filament in the coupler as it cools down.
Edited by GuestGrammar
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owen 19
If you have a soldering iron you can set it up with it's point facing up and hang the tip on that till all the stuff melts and burns out. Then bang the the noxzle upside down onto a hard surface. Then finish off if necessary with something fine through the tip. It has worked for me.
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