I thought it was strange, and at first I thought perhaps I had a setting wrong.
I’m trying to print ABS (also tried with ASA), so I have my bed temp set to 100 (also tried 110) and the AUX fan set to zero (Off) in my project cooling settings.
I noticed during the auto bed leveling and flow calibrations that the Aux fan was running at 40%.
I had the bed set to 110 to warm up the chamber, and also didn’t want too much airflow so I had all the fans off. When I started the print, I noticed the Aux fan come ON to 40%. I kept stopping the print and checking my settings. LOL
Finally I let it continue the print and found that the Aux fan would go to zero (Off) as the first layers started.
I’m using firmware 1.07.01 on my X1C and latest release of Studio (1.8.2.56).
Does this Aux fan running at 40% seem “normal”? Does it serve a purpose? (I’m simply trying to learn).
I suppose it could serve to mix the air in the chamber to help it be a more uniform temperature during warm up, but I’m not sure if this was intentional per the firmware or Studio gcode?
They have a setting in the start g-code you would have to change if you wanted it off or change the value to a lower aux fan speed and then save it as a custom current machine for abs/asa.
Bambu Lab Default = M106 P2 S100 ; turn on big fan ,to cool down toolhead
Thanks for the find in the gcode, it’s nice to learn this stuff.
I was wondering its purpose.
There is a fan in the hotend, so I’m not sure I’d use the Aux fan to cool the head, but they should know their own product.
I noticed another anomaly when using an external spool when the AMS is connected. When you go to unload the external spool filament, I can hear a motor running in the AMS.
Does anyone else notice this?
Yes, I’m detail oriented and always pay attention to noises and how things function.
I had a similar thing happen, I was printing from AMS2 and after complete AMS1 had a motor running for quite sometime before I noticed. I had to drop the power to stop it (just unplugged it at the back) as it just said it was busy when trying the unload load buttons.
The Bambu lab printer has an all round start g-code. They are trying to make it work with most filament types ( so not all settings will be ideal )
The good news is you can change things to work better for the filament type you are using or use custom g-code plus filament override settings and we have Orca slicer to give us more slicer settings to use.
I have not noticed the ams motor but I don’t have the current firmware what version firmware you using ?
I’m using X1C firmware 1.07.01.00
AMS firmware 00.00.06.40
The issue appears when you go to unload an external spool. Then you can hear the filament hub motor in the AMS start to run.
It’s not a spool motor or feed motor where you insert the filament, perhaps it’s the filament hub motor in the rear of the AMS where the ‘odometer’ is located.
I don’t see any lights breathing on the AMS during this motor noise. All lights look normal.
I’ll pay more attention the next time I use the external spool. I’m sure it will repeat itself. If yes, I’ll create a support ticket to try to get the ‘bug’ logged.
Edit: I confirmed it’s the filament hub motor. It starts the moment the message pops up asking you to remove the filament when using the external spool, and the motor stops the instant the filament sensor in the head detects that you pulled the filament back. It also occurs using the 1.07.02 firmware.
I just printed external and my ams did not run the ams internal retraction motor but I have old firmware must be in the new firmware maybe they added the ams backup option to the external spool now
