Filament Stuck! HELP!  

RE: Filament Stuck! HELP!

 I have noticed the Core One is not user freindly in this instance.  The MK4 you can Unload and pull on the filament while unloading.   See if they have posted help on this in the knowledgebase or contact [email protected] for the Core One. 

If there is no sound while trying to undload/load there may be a groove cut in the filament.   If there is a continual clicking sound from the nextruder when it should be feeding, the nozzle may be plugged.  The clicking is the servo failing to turn or advance when pushing the filament.   

I would try the following in order. 

1.  unloading.  When up to temp in the unload process put a firm pull on the filament from outside the Core One.   To help pull it out of the nextruder.

2. After cooling, Open the idler and see if I could push the filament out to grab it, cut it and then take out the nozzle and pull out the filament out of the nozzle.  You could heat the nozzle in boiling water then pull out the filament, similar to a cold pull.  Tools and hand protection needed.    

Sometimes the nextruder can cut a groove in the filament and it wont pull/push it after.      This can happen when the filament is stuck hard on a roll.   Sometimes when the end of the roll is reached and the filament has a hook on the end that wont let go or wont go through the PTFE tube.  Also when there are hundreds of small details combined on a layer with near 0 advance of filament, the constant advance/retract in the same place can wear a groove. 

RE: Filament Stuck! HELP!

Thanks - I'll see if I can follow those instructions and fix this myself. 

RE: Filament Stuck! HELP!

Did you manage to sort the issue?
I'm having exactly the same problem.

Posted by: @keith-r-parsons

Thanks - I'll see if I can follow those instructions and fix this myself. 

RE:

What I did, when I clogged my 0.25 mm nozzle a few times:

1. Open the extruder idler. Left side of the nextruder, flip the little clamp up and move the bigger lever with the extruder idler away from the filament. 
2. Check how it looks. Is the extruder gear full of filament particles or does it look kinda fine? 
3. Main menu, control, set the nozzle to 270°C for PLA.
4. Control - move axis - extruder: when the nozzle passes 220°C, start to push the filament on the side into the ptfe tube and move the extruder "+", so it doesn't restrict, but helps you pushing the filament.
5. Keep the pressure with your right hand on the filament on the side and every few seconds, give the extruder axis a few steps forwards. 
6. At some temperature, the nozzle might make a popping sound and a big blob will come out of the nozzle.
7. Immediately go to controls - temperature - cool down.
8. Then back to move axis - extruder and keep the filament flowing, while still pushing it, to not get heat creep and clog it again! 
9. At around 210°C, you can stop pushing + slowly moving the extruder axis. 
10. Close the extruder and continue printing. 

Keep your room nicely ventilated while doing this! Pushing a blob of PLA through the 270°C nozzle definitely doesn't seem/smell healthy!

With my mk3s, this is a lot simpler, since the extruder gear completely disengages, when taking out the extruder idler tensioning screw. And being able to push the filament from 2 cm above the extruder is a lot easier.

Just heating up the nozzle and keep pushing, until the blob comes out. With the Core One, I have to control the extruder gear, since it rubs against the filament quite a lot, even without the idler.. 

RE: Filament Stuck! HELP!

How do you even open the idler? Ther isn't clear instructions anywhere, very frustrating.  

RE:

The "idler" on the CORE One is the lever/clamp on top left of the Nextruder. To open, lift it upwards as shown in the image below (pink arrows). Then you can open the idler shaft by moving the lever below to the left (blue arrows). 

(see also the description from Prusa for regular maintenance of the printer here: https://help.prusa3d.com/article/regular-printer-maintenance-core-one_829710 )

RE: Filament Stuck! HELP!

My appologies for adding my problem to this topic but for some reason when I wanted to start a new topic I was unable to add any comments to my new topic.  My problem is that I cannot load filament. I have tried several times and have noticed that in the process of loading ESun PLA+ by following the procedures the filament feeds into the extruder but is unable to enter the hole in body of the extruder that feeds to the E3D hot end. it gets caught just on the rim of the hole. I have tried adjusting the spring loaded screws but without any luck. For some reason the gear assembly and the bushing on the idler  are not able to align the filament down through the hole to the hot end.  I am at a loss and would appreciated any help. I tried contacting Prusa directly but their response is very slow. Best regards, Victor Wong, Toronto Canada

RE: Filament Stuck! HELP!

This recently happened to me with a new Core One printer. It looks like the filament snapped right before it goes into the "Nextruder" nozzle. The filament seems to have melted to/stuck to the upper end of the Nextruder and nothing I've tried can purge this stuck filament. I've tried the purge command, pushing it through at the correct nozzle temp and even heating the Nextruder with a heat gun and trying to push filament through. Waiting for a new Nextruder will try again. 

RE: Filament Stuck! HELP!

Hey Calcal, 

I had the same issue. In my case it was PLA-filamet which was kind of brocken after the gear box and an not melted part was stucked. In my case i heard a clickling sond from the gearbox.

After testing a round i found a soluation which worked for me and PLA:

1. Set up eye protection (optional gloves)!
2. Ensure a got Airlow in your room eq. open the windows.
3. Enable the Filtration Fan - if you have some.
4. Unload the filament
5. Heat the nozzle up to 290C - Attention poping filamet can occure - like boiled water!
6. Stick the acupuncture needle inrepeatetly in and out  - Attention poping "exploding" filamet like boiled water can occure!
   1. Do this until no filament is coming out.
   2. Proceed until you almost able to insert the delivered needle compltley
7. If unclocked i recommend still keeping the filtration fan on and keep the windows open
8. Cool Down to PLA-Temperature of ~ 230C
9. Insert Filament thru the TubeGo to Control > Move Axis > E-Axis: And move step by step the motor: If you don't hear any clicking noise, the filament passed thrugh the gear and the filament is coming: The Nozzle is unclocked

Do this procedure on you own Risks and Health!