filament broke in about 5 places in filament tube. how do i remove it?  

RE: filament broke in about 5 places in filament tube. how do i remove it?

remove the Bowden tube from the top of the Nextruder. First pull up the Bowden bend to expose the tube, push down on the retaining ring to release and will pushing it, pull out the tube. Then push in filament from the right side which will then push out the broken pieces. I'm assuming the filament that broke is very old PLA?

RE: filament broke in about 5 places in filament tube. how do i remove it?

Yes what he suggested works.  It happens to me all the time of PLA sits in the Bowden tube for a couple of weeks. 

RE: filament broke in about 5 places in filament tube. how do i remove it?

I am having this problem as well. But this solution does not work because the filament is broken inside of the Bowden tube. I can feel that one end of the filament is 6-7cm from the input side, and the other end is 1cm inside of the outlet - the metal part that screws into the top of the nextruder. I tried pushing the filament with a paper clip, but it does not move a bit. How do I get this filament out without cutting the tube?

RE: filament broke in about 5 places in filament tube. how do i remove it?

The answer is two posts above.  (@hyiger)

RE: filament broke in about 5 places in filament tube. how do i remove it?

Yes, I read that and did it. But when I try to push the filament from the right side (the spool side) whatever I insert (like an extra piece of filament) bumps up against something firm 6cm in. It feels like it is just past the sensor (which offers a very light amount of resistance). No amount of pushing moves any of the stuck filament.

RE: filament broke in about 5 places in filament tube. how do i remove it?

Here you will probably have to disassemble the side filament sensor and see what is obstructing it and remove the obstruction. On the sensor side, press the black clamp and remove the bowden. If you release both ends of the bowden, it should not be a problem to push the fragments out of the tube. And it would be better to remove the cover on the sensor and check if there are any small fragments of filament inside.

RE:

+1 on that - it's maybe just time to take the thing apart and show who's the boss 🙂
Unclip the bowden tube - maybe you can even remove the remaining filament - and if it doesn't help take the sensor out then apart.

IMHO it's just an unavoidable part of the learning curve for "serious" users ("serious" in a sense, who can rely on their printer because they have run into all the relevant snags and figured out how to deal with them). Now this doesn't make for the most glorious marketing narrative but hey, that box can be taken apart with a screwdriver (yes, strictly: "a very limited number of tools").

RE: filament broke in about 5 places in filament tube. how do i remove it?

I am waiting on delivery of the small Torx set that I'll need to take the side of the Core One off (or at least the orange panel covering the input tube). I believe that disconnecting that end of the bowden tube will allow me to push the stuck filament out.

The XL, not being an enclosed beast, is a lot easier to work on than this. It's also a lot more reliable: I have 6550 and 3750 hours on my XLs but the CoreOne has 6 hours and this is not my first problem with it.

RE: filament broke in about 5 places in filament tube. how do i remove it?

For those reading this who cannot easily push the filament out, take a look at this nice writeup in another thread: https://forum.prusa3d.com/forum/prusa-core-one-hardware-firmware-and-software-help/stick-inside-the-filament-sensor-or-how-i-learned-to-bin-my-old-filament/

That's what finally allowed my to clear this jam.