AMS feeding issue while manual feeding work

Recently, my p1s printing start to fail always, the symptom is that AMS loading is not working. If I choose to load from AMS, I can see the filament goes all the way to the print head, and then it goes back, and try again and again 4 times and failed, some something like stuck head. At first I thought it extruder gear issue, so I replaced a new one, but the issue is still there. Actually, I tried to print without AMS and use manual feeding, it works just fine. So I asked chatgpt, it says it might be filament sensor issue. I am not sure if I should replace the sensor too. It looks ok to me. Anyone has the same issue? Is there a way to test the filament sensor? thanks.

Hi there. Did you end up finding out what the issue was with this? I am having a similar issue with my brand new P1S. Although even manually feeding won’t get grabbed by the extruder gears. I swapped extruder gears, put a new hotend in and nothing seems to work. I am having thoughts that maybe I need to back off on the idler tension a bit to allow the filament a very slightly easier path through the gears, but not too sure. The length of the tensioning screw doesn’t allow for me to back the tension off while still fitting inside the housing of the tool head, so I am buying a slightly shorter screw to see if I can get some play in the gears but still have enough tension to drive the filament to the hotend. Would be interested to hear if and how you got it sorted.

Hi, I also have the same problem, I replaced almost every part of the hot end including the filament sensor and it does not want to load the filament.
Did you find a solution?

Printing from the spool holder works fine.

Yes, my issue is the tube is not smooth enough. After I make it smooth, and it works fine.

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