AMS 2 Pro CAN dry when filament is installed and fed into the AMS. I have done it. But only filaments that won’t get too soft like PLA. I have dried PETG and ABS (not really recommended due to insufficient temp for ABS but I did it anyway) with the filaments loaded into the AMS inlet ports. It lets you.
That being said, I’m not super loving the drying function anyway. It takes a long time to heat up and of course, you can’t print from that AMS while it’s drying.
Then why are people saying the opposite ?
Are they missing a setting or feature that needs to be set or disabled ?
It was mentioned that the AMS wants to be able to spin the filament when drying.
I can understand TPU for sure
I assume they have PLA or TPU loaded when they try to start drying and it doesn’t permit that.
Here are two pics showing what I’m saying. One is an AMS 2 Pro loaded with 3 ABS rolls and one empty slot, all rolls are fed into the feeders. Second is an AMS 2 Pro loaded with ABS, PETG, PLA, PLA, again, all loaded into feeders. It won’t allow drying to start cause the filament is loaded into the feeders in the second case, due to the PLA filament. Note the green Start button in the first pic. It does actually initiate drying when you press that.
Can someone explain how I can dry filament whit the ams pro 2 on the p1s I don’t find information of that 
Just read what you buy 
‘The AMS 2 Pro is compatible with X1/P1 series printers for multi-material printing. The filament drying feature for these older generation machines will be fulfilled through an OTA update by the end of April.’
I hope you’ve bought the switching adapter
I have 3 AMS 2 Pro units. I will try to see what happens ifI leave the filament in the filament inlet.
Yes, that wasn’t listed under the compo section 
but oh well, that’s how it is! I bought it with compo whit buffer and got a power unit with it.
Possible, i don’t know when they added that. But its also on the P1S Combo Page But end of April is soon
What would be more practical is the Python build without the housing and then feeding into the python from a dryer unit like the S4. That way you have none of these hassles and still get the drying option, which can be run while printing as well.
I do think the AMS 2 is a good upgrade from the original. I really appreciate the ceramic ports for the filament. I would assume that Bambu could figure out (based on the current humidity in the AMS) how to automatically start drying the filament over time (even while printing) doesnt mean that it has to be 50c all the time. At least let us bring the temps up to 30c or something while printing. Currently I dont use the heating function at all so it seems to be a wasted feature.
