I have had the “Bambu Lab X1 Carbon” for only a few days.
Before that I worked with the “Anycubic i3 Mega” for 6 years.
So a lot of things are new for me.
The current problem:
The fourth AMS chamber seems to stuck sometimes and the print is stopped by the program because of that.
I printed an object yesterday that would normally have taken 10 hours.
With the constant interrupting, it ended up taking almost 15 hours.
I had to constantly stay with it to manually pull out or reload the filament roll.
What’s very noticeable is that the front roll, which has the filament on it, is sometimes stiff. You can’t turn it.
And the light at the filament place then flashes red.
Unfortunately, I neglected to take a photo of the orange error message.
I think sometimes it says: “Error feeding back filament”. And sometimes it also says, “Error trailing filament.”
(Only in meaning, not literally).
Then when I manually traced, it goes again until the next color change. Or sometimes it’s enough if I turn the rolls on which the filament is on back and forth. Then the front bearing loosens up again.
Oh, and the error takes place only in the last chamber of the AMS.
I use the standard filament rolls from Bambu itself.
I have an X1C with 2 AMS and have not yet experienced this particular issue. Following other threads on it though, it seems most often attributed to either a PTFE tube not fully seated or not seated square, or the angle of entry to the print head being suboptimal. For the print head, there are multiple bracket designs on printables to help address the feed angle based on an STL Bambu support hands out when opening a case for this.
Hello, thank you for your reply.
I use the original filament from Bambu.
I’ll try taking the feeder out and see if I can spot a fault.
I really don’t want to mess with the new printer, but I guess I have to.
Hello, thank you for your reply.
I don’t think it’s the filament buffer, because the other three feeders and the other places for the filament rolls do not cause any problems.
It’s a pity that something like this happens right at the beginning. I’ve only had the printer for a few days.
Okay, I’m one step further.
This is not going to be easy to explain…
I have disassembled the feeder. Yellow dust was visible.
Also, the large main gear has a semi-circular dent in the center.
What does that mean?
The filament roll is jammed.
For some reason, the filament roll is jammed and the filament is stationary while the gear continues to turn.
This causes the filament to eat into the gear.
This is the result. And the reason is (my guess) that the filament roll is blocked.
Maybe it is too heavy, or one of the two bearings on which the filament roll rests is blocked.
I also took a close look at these and put them back in place.
The bearing ran smoothly.
Could it be the weight of the filament roll?
Feel free to look at the photos.
I am grateful for ideas, experiences and suggestions.
There were reports from some users that oil had creeps between the drive shaft and the gears, making them slip on the shaft. They had to disassemble, clean the shafts and assemble again.
It might be an explanation.
Have you checked the width of your Filament Reel all the way around, I had a Prusa reel that was 2mm wider at one point. It kept jamming and I would have to yank it out of the AMS then reinsert it, it would appear to work fine then get stuck again. Seems max width is about 69mm for a reel or you will have problems. I had major issues with the BambuLab PLA-CF becuase its so stiff it would snap and jamm all the time. I stopped using it.
