Just noticed my filament buffer banging a lot. I wonder what that could be and/or if normal.
Every ~10min the buffer will start a sequence of several (~10) banging noises. Sound is coming from the buffer sliding right, which it seems to be doing very aggressively some times.
AMS and print seems normal.
Open a ticket and you’ll get proper support and the needed parts
Mine was sort of making a banging noise, maybe not as frequent as yours. I found that one of them was sticking a little bit during its movement. I put a very light/thin coat of synthetic grease on the sliding contact surface. Seems to have fixed it for me.
When I say thin, I mean like you wouldn’t even be able to tell it was there unless you touched it and felt it on your fingers.
Sharing what Bambu suggested me doing:
Dear Customer,
I am sorry you are having this issue, I am here to help
Is the left extruder connected to the same AMS2 PRO as the right extruder, or are you using multiple AMS2 or an AMS HT?
Can you please check the filament buffer spring, and reconnect the buffer connections
HMS_0700-4000-0002-0004: The filament buffer signal is abnormal; the spring may be stuck, or the filament may be tangled. | Bambu Lab Wiki
Replace H2D Filament Buffer and Cable | Bambu Lab Wiki
If the issue persists, can you please reconnect the 6-pin cable to another port on the AMS2PRO?
Mine was banging in the front left corner, it’s banging because the PTFE tube is probably 5mm too short. I replaced the tubes with a longer replacement to make it bend less when the tool head is in the front left corner. Works, but now the tubes bang on the front vents 
Hahaha – we can’t win. Mine was banging in the very same spot, but indeed stopped after I changed my AMS position (which in turn might have made the PTFE less tight)
