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Bambu-gcodes.md

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Bambu G-code list

Non-standard Bambu G-code that has undocumented parameters or deviates from Marlin G-code.

Please contribute edits and corrections with a pull request or issue.

More guesses can be found on this thread.

M106 - Set Fan Speed

Parameter Notes Related flags
none Part cooling fan
P1 Hotend cooling fan
P2 Remote part cooling/big fan
P3 Chamber fan support_air_filtration
S speed

M620 - AMS Toolchange

Bambu AMS Toolchange

Parameter Notes
SXXA Switch to XX filament. M620 M previous line and four spaces on next lines for conditional execution if AMS exists and material switched.
S255 pull back filament to AMS
.1 E F523 T240 Switch to XX filament

M620.1 - AMS Do Toolchange

Parameter Notes
E
F523 Filament extrude feedrate
TXX Extruder temperature XX

M620.11 - AMS Do Toolchange Long Retract Version

Parameter Notes
E Move the extruder and AMS hub motor if negative. Move only AMS hub motor if positive.
F523 Filament extrude feedrate
TXX Extruder temperature XX

M621 - AMS Toolchange

Bambu AMS Toolchange

Parameter Notes
SXXA Switch to XX filament

M622 conditional after M1002

Gcode between M622`` and M623`` runs if timelapse is on.

Parameter Values Notes
J 0 1 conditional

M623 jump location for conditional

M624 - Stop main part

Parameter Values Notes
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M625 - Start main part

M900 - Set flow

Parameter Values Notes
K
M outer_wall_volumetric_speed/(1.75*1.75/4*3.14)*0.02

M901 end smooth timelapse at safe pos

Parameter Values Notes
S 0
P -1

M960 - laser

See thread for `M960``

Parameter Values Notes
S
P

M969 - scanning

Parameter Values Notes
S 0 1 2
P 0 1

M971 - scanning

Parameter Values Notes
S 5
P 2

M973

Parameter Values Notes
S 4 turn off scanner

M975

Parameter Values Notes
S 1 turn on mech mode supression

M991 - notify layer change

M991 notifies printer display of layer change.

Parameter Values Notes
S 0
P 0

M1002 - judge_last_extrude_cali_success / gcode_claim_action : 0

See thread

Parameter Values Notes
set_gcode_claim_speed_level 0 showhide message on screen

T - Select or Report Tool

T command tells the printer which filament (tool) is now selected.

Bambu firmware does not do the toolchange with T command. The actual toolchange with AMS uses the M620 command.

Parameter Notes
255 Switch to empty tool
1000 change to nozzle space
1100 change to scanning space on X1