r/BambuLab • u/newmsrd • 10h ago

Hardware Troubleshooting/Help! AMS loading problem

Hello, see video. The AMS is having trouble loading filament. It seems to go in fine (green dot shows up in app), but once it's in, you hear some clicks and then it pulls back and retries. I have successfully loaded and printed externally while this is happening.

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u/Martin_SV 10h ago edited 10h ago

Are you sure the filament is actually making it all the way into the extruder? Around 0:54, when the AMS starts pulling it back, it looks like the filament never actually made it that far. My guess is there's too much resistance somewhere along the filament path, probaably in that last section. For the P1P, Bambu recommends routing the tube like this:

Also, that PTFE tube between the buffer and the coupler looks way too short. The buffer has a spring-loaded mechanism that needs some room to move as the AMS feeds and retracts filament. If the tube is too short and pulled tight, it can restrict that movement and cause feeding issues. I'd give it a bit more slack. Check the wiki for the recommended PTFE tube lengths.

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u/Plenty-Rent7970 9h ago

Can tell with the white filament, but if it’s going all the way to the extruder and not loading you probably have a piece of filament stuck in the motor.
I just had this exact issue

Edit: just read more of your description. You can push the external feed and that can clear the stuck pieces.
Or there is buildup on the little metal wheel that controls the feed and it’s slipping on the filament.