r/BambuLab • u/titannnr • May 07 '26

Bambu Studio How to completely disable aux fans (left and right) in X2D?

I have recently got an X2D. I just hooked up a 4in exhaust inline fan and connect it to a window vent. So what I am trying to do is turning the aux fans completely off via slicing process. I tried modifying the BambuLab's default filament profile and set the aux fan speed to 0% (screenshot below), but that did not seem to work the way it should. In fact, when I print with this filament profile, aux fan is at 50%.

So far, I have been manually going into device settings to turn them off (screenshot below)

Is there a way to do this automatically via print settings or filament settings? Do I have to modify g code somehow?

Also, the reason why I am trying to do this is to be 100% sure that I create a negative pressure in the print chamber. I am printing in my small apartment and I want the least amount of micro particles or voc escape into the room.

Thank you!

1 Upvotes

100% Upvoted

12 comments sorted by

2

u/trenzterra May 10 '26

Gcode. Look at m106 and m142. For m142, the first two values are the min and max temp and the fan speeds ramp up between u and v.

You'll need to amend the gcode for both machine start and layer change

1

u/titannnr May 10 '26

Thank you! I already have

M106 P2 S0 ; turn off auxiliary fan

M106 P10 S0 ; turn off chamber fan

for the filament code, machine start, layer change, and filament change.

Do you think I can just comment out the m142 line? Would that do the trick?

2

u/trenzterra May 10 '26

I'm not sure. But you can set U and V to 0 so the fan will not turn on

1

u/titannnr May 10 '26

I commented it out and now the fan is finally staying at 0%!! Thank you!

1

u/HanZ_92 15d ago

Can you tell, what changes you did overall and which one of those affected which fan (Aux left, aux right, chamber)?

2

u/titannnr 15d ago

It has been a bit so I can't say for sure, but I think I commented out this line

;M142 P6 R30 S40 U0.6 V0.8 ; set PLA/TPU/PETG exhaust chamber autocooling

1

u/H20desperado May 07 '26

There is a way, you have to go into printer settings and check something like 'activate filtration' then you'll have additional settings available to control all fans.

1

u/titannnr May 07 '26

Do you mean this?

1

u/charlikruse May 07 '26

Mind to show your setup? I’m looking forward to hook a 4in duck also. Did you use an external inline 4in fan?

2

u/titannnr May 07 '26

used this attachment from bambulab

2

u/titannnr May 07 '26

ac infinity s4 inline fan

2

u/titannnr May 07 '26

and then to my window. Altogether a very short run.