I had a strange extruder jam today, the filament had a outgrowth but the filament was NOT flat, I was not able to determine where that came from, probably make by the gears but also probably due to something inside the filament.
Just wanted to share this one, to show that any extruder jam can be easily corrected on Bambulab by unassembling the extruder.
Fully unassembled extruder :
The strange outgrowth that was blocking it in both directions :
There simply cut the filament and remove it.
Haven’t done this myself yet. Do any of those parts require greasing or regreasing when you reassemble them?
Nop, and the process is pretty fast once you make it once :
You are done, the extruder is fully unassembled.
How did you know you had an extruder jam?
Because I am not sure if I have one. I cannot unload the filament and reload is also not possible. The extruder makes a buzzing noise with each load and unload procedure. There is no error message. The filament is cut (I demounted the hotend to check.)
I saw in one of Bambu Labs How to videos, that a little silicon is needed, when the extruder is taken apart if you want to transport the printer later (I cannot find that video again …).
Have you heard about it?
Thank you!
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If you try to extrude or unload and you just hear a buzzing and the yellow gear isn’t moving then it’s jammed. Here’s a handy wiki on how to remove the extruder:
and how to clear it out:
https://wiki.bambulab.com/en/x1/troubleshooting/extruder-clog
About the silicone glue I think you mean the silicone glue that Bambu uses to hold the plugs/connectors in place. Some of the replacement parts you buy will come with a small tube of it. I’ve never actually used it myself after I swapped something out but I can see where it would definitely hold the connectors in place if you were going to move the printer.
Thank you for the fast reply. How can I check, if the yellow extruder wheel is moving or not? Can I try with my fingers to turn it? do I need to make sure I turn it into the right direction?
You’re welcome. If you move the print head close to the front of the printer using the X and Y movement buttons, then take the print head cover off, you can see the yellow gear on the left hand side. You should be able to visually see it turning when you extrude or unload. If it’s jammed it won’t move either way.
What should I do, if the filament is still in the silicon tube? Can I remove it to take out the extruder?
Can you manually move the filament cutter arm on the left side? Try that and then push down on the mechanism the tube is going in to you should be able to pull the tube up and out. You just need it to come out enough that you can cut the filament going in to the extruder (if the arm doesn’t work).
I checked, if the yellow wheel turns when I am trying to unload. It does. Can there be a jam then?
Can I move the cutter also, when the hotend and the extruder is still in place?
So if the wheel is turning and the filament won’t come out or go in then the extruder has stripped the filament where it contacts the gear and has flattened it out to the point it might not be easy to pull it out. You can move the arm while the hotend is still in place. Try that, then remove the tube and see if you can just pull the filament up. If not, snip it and take the extruder off. If that’s the case you’ll have to open it up and get the stripped piece of filament out.
Thank you. I will try my luck tomorrow and report back.
I removed the extruder and this is what I see: When I understand correctly, there is no clog at least not around the wheels. I can push, but if I pull, it jams in the middle.
The problem shown in this image might be related to heat creep.
This wiki article explains more on this topic:
I don’t have access to this link.
Please try again now. The link was corrected.
Thank you I was able to open it now.
Since I was able to move the filament up and down and even turn it around, I just figured the end must be to thick to go through the hole. And this was the case. Look at picture:
After I cut it I was able to pull the filament out. There was no other clog. After putting it back together I started to load the filament again, but the noise from before was still there and the filament did not extrude from the nozzel. I was able to unload it though.
I wonder if I should try the cold pull method?
There might be a chance your hotend is also clogged. Doing the cold pull method could help solve the problem
It is also recommended to check the hotend fan to confirm it is working, and also to confirm the fan spins as expected.
I tried the cold pull method, but I was not able to push the filament far into the extruder. And the grinding noise was audible again. And no filament was extruded from the nozzle. The front tip of the nozzle is visually open.
The hotend fan works fine.
This is what my Hotend looks at the top:
And this is what my nozzle looks like:
The nozzle is a little messy, but the opening is clearly visible.
