I’ve taken apart just about everything except for the extruder. Reason I haven’t is because my printing works fine without the AMS. Manual feeding works. I can load and unload. There is definitely nothing clogged of sort. I’ve only been printing PLA for 2 days. First started as unable to retract for Slot 3. Bambu told me to disassemble to check the magnets and make sure everything is in order. I put everything back together and it became worse. Now it won’t even feed properly. I’ve just about took apart and double, triple, quadruple, penta (kill) checked this. So much so that i’ve striped the screw hole for the AMS Hub unit, Stripped the hole for hall sensor located at the extruder assembly.
Looked around the whole community in bambu forum and reddit, tried all their fixes. unfortunately, their fixes always involves broken filament which mine is completely clear.
Need help from you 3d printing gods for guidance.
It tries to feed and grinds the gears sometimes, othertimes, it feeds it all the way to extruder and it attempts to push but gets stuck push and push grinds the gears, my filament gets burnt marks and errors out.
Unravel about 1-2m of filament from the spool and check that it doesn’t have any abrasions. The grinding seems to cause them.
See AMS is grinding filament, causing errors - Bambu Lab X1 Series / Troubleshooting - Bambu Lab Community Forum
If it has them then that’s your problem now but I don’t know what the original one might be. I have a similar problem and I am suspecting it is the Y splitter I installed as I noticed it would get stuck when the filament was passing through.
The plastic cover that goes over top of the AMS Internal Hub Unit’s – Feeder gear breaks!
I guess they try to design things to use as little material as possible and in this case, the went to far in the wrong direction. Anyway it breaks and somehow interferes with feeding filament. For me it showed itself with having difficulty loading, a grinding noise and abraded filament. Ultimately I found a redit thread that explained it.
To get to this you have too take the AMS apart, remove the Internal Feeder Hub and dismantle the hub. I found a cracked cover and the whole thing was packed with ground up filament. Search for those key words. Bambu has detailed instructions in their wiki for taking all of this apart.
Seems it is just a design flaw. It happened to me and apparently enough other people that there are at least 4 files available for printing a new cover! Thankfully you can do this by feeding a single roll of filament into the extruder. I realize you posted this some time ago but I thought others searching for answers might see your post and this could help them.
Search makerworld for “ams-internal-hub-unit-feeder-rad-cover”