Hi folks,
someone knows a way to set the AUX fan to 0% for Bambu PLA Basic as default somewhere? I edited and saved a User Preset BBL PLA basic no AUX in Filament settings. But after synchronizing with the AMS again the default Bambu PLA Basic will be choosen with AUX at 70% and sometimes I forget to load my Preset resulting in a print with lots of warping. 
You can set your custom profile when assigning filaments inside the bambu handy app as well, for the slicer after syncing, just manually select it from the 3 dots on its right side
… is the way I keep forgetting it. 
This is why I’m looking for a way to make my User Preset the default setting. Disable the AUX fan somewhere else would do the job as well. But so far I haven’t found a setting that will not be overwritten.
I thought you needed to make your User preset into a Custom preset for the setting changes to be recognized by the printer. Turns out I can’t create a Custom preset if the vendor name is Bambu or Generic. Using Studio beta 1.9.0.69 currently.
Kind of glad I don’t have an AMS to change my settings when I’m not looking.
Bambu really needs to explain why we need three types of filament presets and how to determine which is best for a particular use. The current wiki is inadequate.
Can’t speak to profiles or g code but a piece of painters tape along the top of the slot, bent to direct the air flow down a bit rather than straight across the build plate fixed it for me. It’s been there for most of a year and doesn’t seem to cause problems with other filaments. Maybe someone more cleverer than me can design a clip on diffuser.
CANT MAKE A NEW POST SORRY …
HOW DO I TURN OFF The AUX FAN when not printing ?
You have to edit the profile of the filament in Bambu Studio.
Go to Prepare tab
Left hand you will find the filaments
Click the edit button of the filament, e.g. Bambu PLA Basic.
A page opens. Click on tab cooling.
Scroll down to Auxialiary part cooling fan and set Fan speed to 0%
On top right of the page the click save button
Choose User Preset, enter a name, e.g. Bambu PLA no AUX, press OK.
The new preset will be automatically choosen for all present Bambu PLA Basic filaments. To switch between the presets just click the name of the filament at Prepare → Filament. A drop down list will open.
Addition:
You may try an AUX fan deflector:
Since I‘m using this setting AUX to 0% is no longer needed here. 
Another option is to create a custom printer preset and disable the AUX fan in there, when you do that, you do not then need to go edit the filament profiles. See my example below (I also set the nozzle type to my hardened steel but the important change is the one at the bottom)
great idea i didnt think of the printer profile idea going to try that now i just cut the cord on my p1p was too lazy to take of bak to upnplug it ill just rewire with external switch lol
hmm mine doesnt show cooling fan section, any ideas how i can make it work… or is this in orca slicer?
I am running Orcaslicer so that may not be available in Bambu but check you have advanced settings etc. enabled, maybe its just hidden.
but why 100% when not printing and the on /off switch for the aux does jack ■■■■…
Are sure you are hearing the auxiliary fan (left side of the chamber)?
There are other fans that only turn off after things have cooled down - those are not user controllable.
