Change the starting g-code for all system filament profiles of the same type (v1.5.0.60)
The system profile settings path (the first launch of the studio after installation is required):
c:\Users\<WINDOWS USER NAME>\AppData\Roaming\BambuStudio\system\BBL\filament\
To change the starting g-code for all default profiles of the same type (for example, to print as profile Bambu PLA XXXXX with speed of the chamber cooler of 50%), do the following:
- look for and edit the file fdm_filament_pla.json
- at the end of the file there will be a basic g-code in which we change the fan speed to the one we need
- for generic profile, change in Generic PLA @base.json
- after change restart bambu studio if it was runnig
"filament_start_gcode": [
"; filament start gcode\n{if (bed_temperature[current_extruder] >45)||(bed_temperature_initial_layer
[current_extruder] >45)}M106 P3 S125\n{elsif(bed_temperature[current_extruder] >35)||
(bed_temperature_initial_layer[current_extruder] >35)}M106 P3 S125\n{endif}"
]
M106 P3 S125 - in this case S125 is 50% of the speed (value range S0 - S255). Subjectively, I see no reason to spin the chamber fan above 50% at all, since it does not greatly affect the temperature in the chamber. From user experience, it is worth turning it on even when printing ABS, harmful fumes are reduced, as a vacuum is created inside the chamber and air leaves it, mainly through a carbon filter.
Note 1: before updating the version, save these files just in case, bambu studio may overwrite them to default
Note 2: The end g-code is in fdm_filament_common.json, applies to all system profiles of all types of filament
Note 3: for example, Generic PLA and Generic PLA Silk are different types and each needs to change the g-code in the respective files
List of files where the chamber fan speed is set in the starting g-code:
For BBL X1C:
fdm_filament_pet.json
fdm_filament_pla.json
fdm_filament_pva.json
fdm_filament_tpu.json
Generic PETG @base.json
Generic PLA @0.2 nozzle.json
Generic PLA @base.json
Generic PLA Silk @base.json
Generic PLA-CF @base.json
Generic TPU.json
PolyLite PLA @BBL X1C.json
PolyTerra PLA @BBL X1C.json
For BBL P1P:
Generic PLA @BBL P1P 0.2 nozzle.json
Generic TPU @BBL P1P.json
Note: it’s not clear why this parameter is set for P1P
Hope this helps someone