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John Block
(@john-block)
New Member
Filament stuck in cold end

I had a large print going last night and I went away for a while. Well it failed while I was away and when I checked on it, I saw it was failed so I canceled the print. I went to restart things this morning and didn't get any filament laid down when the print started. I checked it by trying to back it out and it didn't budge. I heated the hot end to temp, (255 for ABS) and attempted to pull it out and the filament broke just above the cold end tube. I removed the cold end and I can't get the filament out of it.

Anyone have this problem before? I can't push it from either side. I don't know if it got too hot last night and expanded in the cold end or what, but it is jammed very good in there.

Please give me ideas on how to proceed...

Thanks,
John

Posted : 03/03/2017 9:10 pm
PJR
 PJR
(@pjr)
Antient Member Moderator
Re: Filament stuck in cold end

Well, it looks like you have disassembled the extruder now (easier to fix whilst assembled - just remove the fan and heat until the filament pushes through).

You may as well now pull out the PTFE tubing (push down the black ring at the top) and replace that.

Peter

Please note: I do not have any affiliation with Prusa Research. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage…

Posted : 03/03/2017 9:20 pm
Milos V.
(@milos-v)
Prominent Member
Re: Filament stuck in cold end

I was dealing with similar problem because of fan failure (check the cold-end fan, not to happen again). I was not able to remove the PTFE tube from the cold end. Pushing the black ring did not help. Finally it cuts inside and also trying to get it out I destroyed the black ring on the top.
I put it into the oven, heated to 110°C and pushed it through with a big needle, but it was PLA. But I had to replace PTFE tube and the bowden ring later on (possible to buy both, it is very cheap, but you need to order it somewhere). The filament was completely jammed in the tube. I did not believe it is possible.
So try to be more handy then me 🙂

Milos.

Posted : 03/03/2017 10:16 pm
John Block
(@john-block)
New Member
Topic starter answered:
Re: Filament stuck in cold end

I was able to remove the filament from the cold end. I disassembled everything and started with the nozzle and then the connector to the Hot End. I was then able to connect the cold end and heat it and get the filament unstuck. I don't think there is any damage.

Thanks All that replied!

John

Posted : 04/03/2017 5:32 am
ron
 ron
(@ron)
Estimable Member
Re: Filament stuck in cold end

I was dealing with similar problem because of fan failure (check the cold-end fan, not to happen again). I was not able to remove the PTFE tube from the cold end. Pushing the black ring did not help. Finally it cuts inside and also trying to get it out I destroyed the black ring on the top.
I put it into the oven, heated to 110°C and pushed it through with a big needle, but it was PLA. But I had to replace PTFE tube and the bowden ring later on (possible to buy both, it is very cheap, but you need to order it somewhere). The filament was completely jammed in the tube. I did not believe it is possible.
So try to be more handy then me 🙂

Milos.

My black retaining ring is also broken. Where did you buy your spare part. How did you remove the in place part?

Posted : 20/03/2017 5:49 pm
david.b14
(@david-b14)
Honorable Member
Re: Filament stuck in cold end

See this thread, if you have another 3D printer you may try printing it:

http://shop.prusa3d.com/forum/original-prusa-i3-mk2-f23/secure-ring-for-ptfe-t3398.html

Posted : 20/03/2017 6:37 pm
Milos V.
(@milos-v)
Prominent Member
Re: Filament stuck in cold end

I was dealing with similar problem because of fan failure (check the cold-end fan, not to happen again). I was not able to remove the PTFE tube from the cold end. Pushing the black ring did not help. Finally it cuts inside and also trying to get it out I destroyed the black ring on the top.
I put it into the oven, heated to 110°C and pushed it through with a big needle, but it was PLA. But I had to replace PTFE tube and the bowden ring later on (possible to buy both, it is very cheap, but you need to order it somewhere). The filament was completely jammed in the tube. I did not believe it is possible.
So try to be more handy then me 🙂

Milos.

My black retaining ring is also broken. Where did you buy your spare part. How did you remove the in place part?

I used a supplier from my country, it seems it is a standard spare part of E3D hotend. Probably I could also ask Prusa support for the spare part. Fortunately I am form Czech Republic, so I do not need to wait long time and pay extra shipping costs when fixing my mistakes 🙂

Posted : 20/03/2017 10:55 pm
ron
 ron
(@ron)
Estimable Member
Re: Filament stuck in cold end

I used a supplier from my country, it seems it is a standard spare part of E3D hotend. Probably I could also ask Prusa support for the spare part. Fortunately I am form Czech Republic, so I do not need to wait long time and pay extra shipping costs when fixing my mistakes 🙂
Prusa gave me that reference: http://e3d-online.com/Embedded-Bowden-Couplings-For-Metal-1.75mm-Filament

Posted : 21/03/2017 9:52 am
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