MarlinFirmware/Documentation/GCodes.md

Implemented G Codes

G Codes

• G0 -> G1
• G1 - Coordinated Movement X Y Z E
• G2 - CW ARC
• G3 - CCW ARC
• G4 - Dwell S[seconds] or P[milliseconds]
• G10 - retract filament according to settings of M207
• G11 - retract recover filament according to settings of M208
• G28 - Home all Axis
• G29 - Detailed Z-Probe, probes the bed at 3 points. You must be at the home position for this to work correctly.
• G30 - Single Z Probe, probes bed at current XY location.
• G31 - Dock Z Probe sled (if enabled)
• G32 - Undock Z Probe sled (if enabled)
• G90 - Use Absolute Coordinates
• G91 - Use Relative Coordinates
• G92 - Set current position to cordinates given

M Codes

• M0 - Unconditional stop - Wait for user to press a button on the LCD (Only if ULTRA_LCD is enabled)
• M1 - Same as M0
• M17 - Enable/Power all stepper motors
• M18 - Disable all stepper motors; same as M84
• M20 - List SD card
• M21 - Init SD card
• M22 - Release SD card
• M23 - Select SD file (M23 filename.g)
• M24 - Start/resume SD print
• M25 - Pause SD print
• M26 - Set SD position in bytes (M26 S12345)
• M27 - Report SD print status
• M28 - Start SD write (M28 filename.g)
• M29 - Stop SD write
• M30 - Delete file from SD (M30 filename.g)
• M31 - Output time since last M109 or SD card start to serial
• M32 - Select file and start SD print (Can be used when printing from SD card)
• M42 - Change pin status via gcode Use M42 Px Sy to set pin x to value y, when omitting Px the onboard led will be used.
• M80 - Turn on Power Supply
• M81 - Turn off Power Supply
• M82 - Set E codes absolute (default)
• M83 - Set E codes relative while in Absolute Coordinates (G90) mode
• M84 - Disable steppers until next move, or use S[seconds] to specify an inactivity timeout, after which the steppers will be disabled. S0 to disable the timeout.
• M85 - Set inactivity shutdown timer with parameter S[seconds]. To disable set zero (default)
• M92 - Set axis_steps_per_unit - same syntax as G92
• M104 - Set extruder target temp
• M105 - Read current temp
• M106 - Fan on
• M107 - Fan off
• M109 - Sxxx Wait for extruder current temp to reach target temp. Waits only when heating

•     Rxxx Wait for extruder current temp to reach target temp. Waits when heating and cooling
  

• M112 - Emergency stop
• M114 - Output current position to serial port
• M115 - Capabilities string
• M117 - display message
• M119 - Output Endstop status to serial port
• M126 - Solenoid Air Valve Open (BariCUDA support by jmil)
• M127 - Solenoid Air Valve Closed (BariCUDA vent to atmospheric pressure by jmil)
• M128 - EtoP Open (BariCUDA EtoP = electricity to air pressure transducer by jmil)
• M129 - EtoP Closed (BariCUDA EtoP = electricity to air pressure transducer by jmil)
• M140 - Set bed target temp
• M190 - Sxxx Wait for bed current temp to reach target temp. Waits only when heating

•     Rxxx Wait for bed current temp to reach target temp. Waits when heating and cooling
  

• M200 - D[millimeters]- set filament diameter and set E axis units to cubic millimeters (use S0 to set back to millimeters).
• M201 - Set max acceleration in units/s^2 for print moves (M201 X1000 Y1000)
• M202 - Set max acceleration in units/s^2 for travel moves (M202 X1000 Y1000) Unused in Marlin!!
• M203 - Set maximum feedrate that your machine can sustain (M203 X200 Y200 Z300 E10000) in mm/sec
• M204 - Set default acceleration: P for Printing moves, R for Retract only (no X, Y, Z) moves and T for Travel (non printing) moves (ex. M204 P800 T3000 R9000) in mm/sec^2
• M205 - advanced settings: minimum travel speed S=while printing T=travel only, B=minimum segment time X= maximum xy jerk, Z=maximum Z jerk, E=maximum E jerk
• M206 - set additional homing offset
• M207 - set retract length S[positive mm] F[feedrate mm/min] Z[additional zlift/hop], stays in mm regardless of M200 setting
• M208 - set recover=unretract length S[positive mm surplus to the M207 S*] F[feedrate mm/min]
• M209 - S[1=true/0=false] enable automatic retract detect if the slicer did not support G10/11: every normal extrude-only move will be classified as retract depending on the direction.
• M218 - set hotend offset (in mm): T[extruder_number] X[offset_on_X] Y[offset_on_Y]
• M220 - S[factor in percent] - set speed factor override percentage
• M221 - S[factor in percent] - set extrude factor override percentage
• M240 - Trigger a camera to take a photograph
• M280 - Position an RC Servo P[index] S[angle/microseconds], ommit S to report back current angle
• M300 - Play beep sound S[frequency Hz] P[duration ms]
• M301 - Set PID parameters P I and D
• M302 - Allow cold extrudes
• M303 - PID relay autotune S[temperature] sets the target temperature. (default target temperature = 150C)
• M304 - Set bed PID parameters P I and D
• M350 - Set microstepping mode.
• M351 - Toggle MS1 MS2 pins directly.
• M400 - Finish all moves
• M401 - Lower z-probe if present
• M402 - Raise z-probe if present
• M404 - N[dia in mm] Enter the nominal filament width (3mm, 1.75mm) or will display nominal filament width without parameters
• M405 - Turn on Filament Sensor extrusion control. Optional D[delay in cm] to set delay in centimeters between sensor and extruder
• M406 - Turn off Filament Sensor extrusion control
• M407 - Displays measured filament diameter
• M500 - stores paramters in EEPROM
• M501 - reads parameters from EEPROM (if you need reset them after you changed them temporarily).
• M502 - reverts to the default "factory settings". You still need to store them in EEPROM afterwards if you want to.
• M503 - print the current settings (from memory not from EEPROM)
• M540 - Use S[0|1] to enable or disable the stop SD card print on endstop hit (requires ABORT_ON_ENDSTOP_HIT_FEATURE_ENABLED)
• M600 - Pause for filament change X[pos] Y[pos] Z[relative lift] E[initial retract] L[later retract distance for removal]
• M907 - Set digital trimpot motor current using axis codes.
• M908 - Control digital trimpot directly.
• M928 - Start SD logging (M928 filename.g) - ended by M29
• M999 - Restart after being stopped by error

Comments

Comments start at a ; (semicolon) and end with the end of the line:

N3 T0*57 ; This is a comment
N4 G92 E0*67
; So is this
N5 G28*22

(example taken from the RepRap wiki)

If you need to use a literal ; somewhere (for example within M117), you can escape semicolons with a \ (backslash):

 M117 Hello \;)

\ can also be used to escape \ itself, if you need a literal \ in front of a ;:

M117 backslash: \\;and a comment

Please note that hosts should strip any comments before sending GCODE to the printer in order to save bandwidth.