I just got my P1S and AMS2 Pro. I am able to properly print with the P1S. However whenever I try to print with the AMS, it either prints a first layer and stops extruding while still moving the nozzle like its printing or it never extrudes anything while the nozzle continues to move like it is actually printing something. I am not getting any error messages during this. When I try to print the same model with an external spool it just works. I changed my nozzle to the hardened steel 0.4mm from Bambu but I haven’t done anything else.
I would check the cable connections between the AMS and P1S and also check to make sure all the PTFE tubing is seated in to the toolhead, buffer, and AMS.
Check that the two screws you removed/replaced when you changed nozzles are aligned and screwed in correctly. If the nozzle is even slightly misaligned in relation to the extruder filament path it can’t feed filament through that long path to the nozzle.
No errors can imply that it is more of a physical/mechanical problem rather than an electrical problem. There are sensors along the filament path from the AMS to the nozzle and those sensors will catch some issues but not all.
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