| Custom M Codes |
| 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 |
| M42 |
Change pin status via gcode |
| 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 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. To disable set zero (default) |
| M92 |
Set axis_steps_per_unit same syntax as G92 |
| M114 |
Output current position to serial port |
| M115 |
Capabilities string |
| M117 |
Display message |
| M119 |
Output endstop status to serial port |
| M140 |
Set bed target temp |
| M190 |
Wait for bed current temp to reach target temp. |
| M200 |
Set filament diameter |
| 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: S normal moves T filament only moves (M204 S3000 T7000) in mm/sec^2 also sets minimum segment time in ms (B20000) to prevent buffer underruns and M20 minimum feedrate |
| 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 homeing offset |
| M207 |
Set retract length S[positive mm] F[feedrate mm/sec] Z[additional zlift/hop] |
| M208 |
Set recover=unretract length S[positive mm surplus to the M207 S*] F[feedrate mm/sec] |
| 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. |
| M220 |
S– set speed factor override percentage |
| M221 |
S– set extrude factor override percentage |
| M240 |
Trigger a camera to take a photograph |
| M301 |
Set PID parameters P I and D |
| M302 |
Allow cold extrudes |
| M303 |
PID relay autotune S sets the target temperature. (default target temperature = 150C) |
| M400 |
Finish all moves |
| 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) |
| M999 |
Restart after being stopped by error |