DNE G Code in Marlin

DO NO EDIT -- TRANSFERRED TO NEW WIKI

##About G-Code

G-Code (or GCode) is the instruction code that tells a RepRap 3D printer what to do. For example, the G-Code G0 X10 tells the machine to move the current tool to X position 10. Marlin's GCode is loosely based on the language specification for the [http://www.nist.gov/customcf/get_pdf.cfm?pub_id=823374 NIST RS274NGC Interpreter], but departs radically in its specific implementation details. (For example, RepRap G-Code doesn't care about "modal groups.")

##G-Code in Marlin

###Movement G0 -> G1
G1 - Coordinated Movement X Y Z E
G2 - Clockwise Arc
G3 - Counter-clockwise Arc
G4 - Dwell S or P
G92 - Set the "current position" for X Y Z E
M0 - Wait for user, with optional prompt message (requires LCD controller)
M1 -> M0
M400 - Finish all moves
M999 - Restart after an Emergency Stop

###SD Card M20 - List SD card
M21 - Init SD card
M22 - Release SD card
M23 - Select an SD file by DOS path (M23 path/to/filename.g)
M24 - Start/resume SD print
M25 - Pause SD print
M26 - Set SD position in bytes
M27 - Report SD print status
M28 - Start SD write
M29 - Stop SD write
M30 - Delete file from SD
M31 - Print the time since SD print started, or since the most recent M109 command
M32 - Select file and start SD print. Can be used within G-Code files to include other files.
M540 - Set the state of the Abort on Endstop Hit flag.
M928 - Start SD logging. Stop logging with M29.

###Hardware Control M42 - Change pin status via gcode: P S. If P is omitted the onboard LED pin will be used. M42 P9 S1 ; set PIN 9 to 1.
M80 - Turn on Power Supply
M81 - Turn off Power Supply
M85 - Set inactivity shutdown timer with parameter S. Disable with "M85" or "M85 S0".
M112 - Emergency stop. Requires hardware reset!!
M226 - Wait for a pin to be in some state: P S
M410 - Quickstop. Abort all planned moves, stopping the printer.

###Temperature M104 - Set extruder target temperature
M105 - Request the current temperature of all heaters
M106 - Set the fan speed
M107 - Set the fan speed to 0 (thus turning it off)
M109 - Wait for an extruder to reach its target temperature. Optionally set the target temperature. Optionally enable AUTOTEMP.
M140 - Set heated bed target temperature
M145 - Set "heatup state" values for the LCD Menu
M190 - Wait for the heated bed to reach its target temperature. Optionally set the target temperature.
M301 - Set PID parameters P I and D
M302 - Allow cold extrudes, or set the minimum extrusion temperature
M303 - PID relay autotune S sets the target temperature. (default target temperature = 150C)
M304 - Set bed PID parameters P I and D

###Messages M111 - Set debug flags
M114 - Output current position to serial port
M115 - Capabilities string
M117 - Display message text on the LCD
M119 - Output Endstop status to serial port

###Endstops M120 - Enable endstop detection
M121 - Disable endstop detection

###Special Features M126 - Solenoid Air Valve Open. (Requires BARICUDA)
M127 - Solenoid Air Valve Closed. (Requires BARICUDA)
M128 - EtoP Open. (Requires BARICUDA)
M129 - EtoP Closed. (Requires BARICUDA)
M150 - Set BlinkM RGB Color via I2C. (Requires BLINKM)
M240 - Trigger a camera to take a photograph. (Requires CHDK or PHOTOGRAPH_PIN)
M250 - Set LCD contrast
M280 - Set servo position (absolute)
M300 - Play a beep sound. (Requires BEEPER_PIN or LCD_USE_I2C_BUZZER)
M380 - Activate solenoid on active extruder. (Requires EXT_SOLENOID)
M381 - Disable all solenoids. (Requires EXT_SOLENOID)
M600 - Pause for filament change. (Requires FILAMENTCHANGEENABLE)

###Units and Measures G90 - Use Absolute Coordinates
G91 - Use Relative Coordinates
M82 - Set E codes absolute (default)
M83 - Set E codes relative while in Absolute Coordinates (G90) mode
M92 - Set axis_steps_per_unit - same syntax as G92
M200 - Set filament diameter and E axis units to mm^3
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
M218 - Set hotend offset (in mm): T<extruder_number> X<offset_on_X> Y<offset_on_Y>
M220 - Set speed factor override percentage: S
M221 - Set extrude factor override percentage: S

###Firmware Retraction G10 - Retract filament according to settings of M207
G11 - Retract recover filament according to settings of M208
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/s]
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

###Z Probe G28 - Home one or more axes. Note G28 clears the bed leveling compensation matrix so use G28 followed by G29
G29 - Probe the bed Z height at multiple points and enable bed leveling compensation (ABL)
G30 - Probe the bed Z height at the current XY position
G31 - Dock Z Probe sled
G32 - Undock Z Probe sled
M48 - Measure Z Probe repeatability. To test the accuracy of your z probe for bed leveling (returns standard deviation)
M401 - Lower auto bed leveling Z-probe with a servo, ensure you are safe above the bed to clear the probe
M402 - Raise Z-probe. Note: drives the servo
M420 - Enable or disable Mesh Bed Leveling
M421 - Set a single Mesh Bed Leveling Z coordinate: X Y Z
M851 - Custom M code in Marlin to set/fine tune the z probe offset. (i.e. probe offset = 6.90 mm: use M851 Z-6.90, and store with M500 in EEPROM (if enabled))

###Filament Diameter M404 - Set (or display) Nominal Filament Diameter in mm: [N] (e.g., 3mm or 1.75mm)
M405 - Turn on Filament Sensor extrusion control: [D] to set distance (in cm) from sensor to extruder
M406 - Turn off Filament Sensor extrusion control
M407 - Display measured Filament Diameter

###EEPROM Settings M500 - Save current settings to EEPROM.
M501 - Load stored settings from EEPROM.
M502 - Revert to the default "factory settings." '''''Does not store them in EEPROM!'''''
M503 - Print current settings (from memory, not EEPROM).

###Delta M665 - Set Delta configurations: L R S<segments/s>
M666 - Set Delta endstop adjustment: X Y Z
M605 - Set dual x-carriage movement mode: S [ X R ]

###Stepper Drivers M17 - Enable/Power all stepper motors
M18 -> M84
M84 - Disable steppers until the next move, or set the inactivity timeout after which steppers should be disabled.
M907 - Set digital trimpot motor current using axis codes.
M908 - Control digital trimpot directly.
M350 - Set microstepping mode.
M351 - Toggle MS1 MS2 pins directly to set microstepping.

###SCARA ''May change to suit future G-code standards''
M360 - SCARA calibration: Move to cal-position ThetaA (0 deg calibration)
M361 - SCARA calibration: Move to cal-position ThetaB (90 deg calibration - steps per degree)
M362 - SCARA calibration: Move to cal-position PsiA (0 deg calibration)
M363 - SCARA calibration: Move to cal-position PsiB (90 deg calibration - steps per degree)
M364 - SCARA calibration: Move to cal-position PSIC (90 deg to Theta calibration position)
M365 - SCARA calibration: Scaling factor, X, Y, Z axis

###Host Printing M110 - Set the current Line Number

##G-Code 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 \;)

The backslash \ 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.