Hi, my K2 plus was working fine until two days ago when it started putting out error messages about filament extrusion issues and retraction issues. I took the extruder apart and nothing found there, then removed nozzle and found filament broken off inside the metal tube down the centre of the nozzle. Purchased new Creality official nozzles and installed first one. Same issue as before with filament not extruding and messages about retraction etc on the screen. Removed the new nozzle and filament jammed inside it just like the first nozzle. Put in the second new nozzle and the same issue again. WTH is wrong with this printer? Does anyone know why it just keeps jamming filament in the nozzles? Please help. Thank you
Could be a lot of different things - try searching here for related issues, like K2 Plus Nozzle not heating as expected Issues
Also check out K2 Plus User Guide | Creality Wiki for official troubleshooting steps.
Make sure where the filament goes in the head, that the interface lock for the tubing didn’t break apart. When it does piece of it fall down in to the extruder head and damage the filament cutter too. If that is the case there are several fixes out there (that require another printer to print a repair part), or you need to order a new front extruder and cutter knives.
I have a new extruder from Creality, but I prefer to use the new part and better interface lock that the original Creality part.
-Dave
I had the same problem with a certain filament. I had to increase the filament temperature 10 degree celsius above K2 pro original setting. Thats even 10 degree over the recommended setting on the filament reel. I think due to the high filament speed that the filament temperature is actually lower at the nozzle.
Thank you all for your replies. I appear to have resolved the issue now.
I replaced the entire hot end assembly and then when I powered up the printer it started making a straining noise when trying to feed the filament which it was not doing previously. I started getting a message about filament being blocked between the CFS and the detector unit. I took the covers off the bottom of the CFS and blew out any dust that was there, then I took a long piece of PLA and fed it through the PTFE tube from the top of the hot end assembly to the detector unit and that was ok, Then I fed the PLA through the PTFE tube from where it feeds into the CFS back towards the detector and discovered that there was a kink in the PTFE tube where it connects to the CFS. The kink was causing significant resistance on the PLA so I straightened it out until the PLA flowed freely. Then I discovered that the electrical cable from the detector unit was no longer connected to the CFS. Once these kink was straightened out and the filament detector reconnected to the CFS I tried an extrusion test and it worked. The printer is now back in service and part way through a job.
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Thank you for your reply. I appear to have resolved the issue now.
I replaced the entire hot end assembly and then when I powered up the printer it started making a straining noise when trying to feed the filament which it was not doing previously. I started getting a message about filament being blocked between the CFS and the detector unit. I took the covers off the bottom of the CFS and blew out any dust that was there, then I took a long piece of PLA and fed it through the PTFE tube from the top of the hot end assembly to the detector unit and that was ok, Then I fed the PLA through the PTFE tube from where it feeds into the CFS back towards the detector and discovered that there was a kink in the PTFE tube where it connects to the CFS. The kink was causing significant resistance on the PLA so I straightened it out until the PLA flowed freely. Then I discovered that the electrical cable from the detector unit was no longer connected to the CFS. Once these kink was straightened out and the filament detector reconnected to the CFS I tried an extrusion test and it worked. The printer is now back in service and part way through a job.