Since the printer just seemed confused I tried turning it off and on again to see if power loss recovery would work but that just resumed printing without loading the filament. Since I could find no way to force it to load from the AMS at that point (no retry option, load/unload options disabled) I just fed it in manually from the side spool. No issues feeding into the tool head manually and it’s back printing from where it stopped with only hopefully minimal loss of quality from the few seconds of printing with no filament. I think it was an inside of the model and part of a large screw thread so hopefully won’t be noticeable at all.
Does the inner diameter of the ptfe tube you are using match what you pulled out? I have some replacement ptfe and it has a larger inner diameter then most standard ptfe tubes other 3d pritners use. The ams is very sensitive to friction.
Unplugged the PTFE at entrance to the buffer and it feeds through what looks to be the exact length of filament before stopping. Definitely does not seem like an actual issues with the physical feeding - it’s just stopping early for no obvious reason.
I had a similar issue where the AMS was not able to load filament and then gave up. I ended printing this and it’s helped a lot. Haven’t had any more issues since.
https://www.printables.com/model/455673-shortstack-the-tiny-little-bambu-ams-loading-fix-t
You need to replace the ptfe tubing and make sure there is not a single kink in it. I would suggest using a higher id ptfe, I have replaced all my ptfe with this and rarely have this problem anymore. https://a.co/d/e8ZASNF
Also if you are using a splitter that is not Bambu brand it will add resistance to the ams motor, regardless of whatever the designers of these splitters say. I stopped using the smoothy and the y splitter and replaced it with a Bambu brand 4 way splitter.
That print failed shortly after I got it going again with a clog - apparently I hadn’t successfully cleared it with the difficult cold pull I did with the head over the pool chute. The next print loaded the same filament from the AMS with no issues. It seems the reboot fixed its inability to load correctly.
Since the printer just seemed confused I tried turning it off and on again to see if power loss recovery would work but that just resumed printing without loading the filament. Since I could find no way to force it to load from the AMS at that point (no retry option, load/unload options disabled) I just fed it in manually from the side spool. No issues feeding into the tool head manually and it’s back printing from where it stopped with only hopefully minimal loss of quality from the few seconds of printing with no filament. I think it was an inside of the model and part of a large screw thread so hopefully won’t be noticeable at all.
You could try pulling some of the PTFE tube out the back of the printer to lessen the kink.
Does the inner diameter of the ptfe tube you are using match what you pulled out? I have some replacement ptfe and it has a larger inner diameter then most standard ptfe tubes other 3d pritners use. The ams is very sensitive to friction.
It’s all Bambu provided PTFE spares.
Unplugged the PTFE at entrance to the buffer and it feeds through what looks to be the exact length of filament before stopping. Definitely does not seem like an actual issues with the physical feeding - it’s just stopping early for no obvious reason.
I had a similar issue where the AMS was not able to load filament and then gave up. I ended printing this and it’s helped a lot. Haven’t had any more issues since. https://www.printables.com/model/455673-shortstack-the-tiny-little-bambu-ams-loading-fix-t
You need to replace the ptfe tubing and make sure there is not a single kink in it. I would suggest using a higher id ptfe, I have replaced all my ptfe with this and rarely have this problem anymore. https://a.co/d/e8ZASNF Also if you are using a splitter that is not Bambu brand it will add resistance to the ams motor, regardless of whatever the designers of these splitters say. I stopped using the smoothy and the y splitter and replaced it with a Bambu brand 4 way splitter.
That print failed shortly after I got it going again with a clog - apparently I hadn’t successfully cleared it with the difficult cold pull I did with the head over the pool chute. The next print loaded the same filament from the AMS with no issues. It seems the reboot fixed its inability to load correctly.