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M18
Disable steppers until next move. Same as M84.
M20
List all SD card files under the root directory.
F: Flags for displaying, 0 for displaying filename only, 1 for displaying file size, 2 for displaying directory
Example:
M20 ; List files under root directory
M21 ; List files with file size
M21
Initialize SD card. SD card must be initialized before being used.
M22
SD card is released and can be physically removed.
M23
The file specified is selected ready for printing.
Example:
M23 filename.g ; Selects filename.g as the print file
M24
Start/resume SD print
M25
Pause SD print
M27
Report SD print status
M28
Start SD write from host to SD card. Any subsequent command sent from the host will be written to the SD card.
The SD card write process will only stop when M29 is called.
Example:
M28 filename.g ; filename.g is created (or overwritten if it exists) on the SD card
M29
Stop SD write
M30
Delete file from SD
Example:
M30 filename.g ; Delete filename.g on SD card
M31
Enable / Disable autoprint from SD card
For more information about autoprint, please refer to the autoprint page
E: 0 to enable autoprint, 1 to disable autoprint
Example:
M31 E1 ; Enable autoprint
M31 E0 ; Disable autoprint
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. Same as M18.
M85
Set an inactivity timeout, after which the steppers and heaters will be disabled.
S: Seconds to specify an inactivity timeout, 0 to disable the timeout
Example:
M85 S1 ; Enable a 1 second inactivity timeout
M85 S0 ; Disable the timeout
M92
Set axis_steps_per_unit - same syntax as G92
Example:
M92 X1 Y2 Z3 E4
M93
Show axis steps per unit
M104
Set extruder target temp
S: Extruder target temperature
Example:
M104 S230 ; Set extruder target temperature to 230C
M105
Read current temp
M106
Fan on
S: Speed of the Fan motor. Ranges from 0 to 255
Example:
M106 S125 ; Set duty cycle of fan to 50%
M107
Fan off
M109
Wait for extruder current temp to reach target temp.
S: Extruder target temperature
Example:
M109 S230 ; Wait for extruder target temperature to reach 230C
M112
Emergency Stop. Any moves in progress are immediately terminated. All motors and heaters are turned off.
M114
Display current position
M115
Get firmware version and capabilities string
M119
Show Endstopper State
M140
Set bed target temperature
S: Bed target temperature
Example:
M140 S120 ; Set bed target temperature to 120C
M190
Wait for bed current temp to reach target temp
S: Bed target temperature
Example:
M190 S120 ; Wait for bed target temperature to reach 120C
M201
Set maximum acceleration for print moves
X,Y,Z,E: (units/s^2)
Example:
M201 X1 Y2 Z3 E4 ; Set maximum acceleration for X,Y,Z,E axes
M202
Set maximum feed rate that your machine can sustain
X,Y,Z,E: (mm/sec)
Example:
M203 X1 Y2 Z3 E4 ; Set maximum feed rate for X,Y,Z,E axes
M203
Set temperture monitor
S: For repetier host, 0 for returning extruder temperature, 1 for returning bed temperature, temperature is reported every 0.25 seconds
P: For 5D host, interval in seconds for regular temperature report
5DPrint Example:
M203 P1 ; Sets the regular temperature reporting to every 1 second
Repetier Host Example:
M203 S0 ; Set temperature monitor to return hot end's temperature
M203 S1 ; Set temperature monitor to return bed's temperature
M204
Set default acceleration for extrusion
S: Extrude filament acceleration in mm/sec^2
T: Retract filament acceleration in mm/sec^2
Example:
M204 S1 ; Set extrude acceleration to 1
M204 T1 ; Set retract acceleration to 1
M205
Advanced settings
S: minimum feed rate T: minimum travel speed X: maximum xy jerk Z: maximum Z jerk
M206
Set additional homing offset
X,Y,Z: Coordinates
Example:
M220 X1 Y2 Z3 ; Set additional homing offset to (1,2,3)
M220
Set feed multiply factor
S: multiply factor (from 20 to 200)
Example:
M220 S100 ; Set feed multiply factor to 100
M221
Set extruder multiply factor
S: multiply factor (from 40 to 200)
Example:
M221 S100 ; Set extruder multiply factor to 100
M226
Pause print
P: Pause flag, 0 to resume print, 1 to pause print after current block, -255 to discard plan buffer and resume operation
Example:
M226 P1 ; Pause print after current block has finished
M226 P0 ; Resume print
M226 P-255 ; discard plan buffer contents and resume normal operation
M300
Play beep sound
F: Frequency in Hz(from 100 Hz to 5000 Hz)
P: Period in milliseconds (from 0 to 2000 ms)
Example:
M300 F4000 P1000 ; Play a 4 kHz tone for 1 s
M301
Set PID parameters for the temperature control
P: Proportional value I: Integral value D: Derivative value
Example:
M301 P1 I2 D3 ; Set the P,I,D value to 1,2,3
M302
Enable / Disable Cold Extrudes
P: 0 to disable cold extrude, 1 to enable cold extrude
Example:
M302 P1 ; Enable cold extrudes
M302 P0 ; Disable cold extrudes
M303
PID relay autotune
S: target temperature, default target temperature is 200°C
C: Number of cycles for autotune, default is 5 cycles
F: Control type, default is 0
- 0: Classic PID
- 1: Some overshoot
- 2: No overshoot
- 3: Return all PID results listed above
Example:
M303 S200 ; PID Autotune at 200°C
M303 F3 ; Return all PID results
M303 C10 ; Perform 10 PID Autotune cycles
M305
Set hot bed maximum duty cycle
S: Stage 1 or 2, Stage 1 is before 70C, while Stage 2 is after 70C
D: Duty cycle of hot bed, from 0% to 100%
Example:
M305 S1 D70 ; Set hot bed maximum duty cycle to 70% before 70C
M305 S2 D85 ; Set hot bed maximum duty cycle to 85% after 70C
M400
Finish all moves left in the buffer
M500
Store parameters in EEPROM
Refer to the EEPROM page for more information.
M501
Read parameters from EEPROM to current session
Refer to the EEPROM page for more information.
M502
Revert to the default "factory settings
Refer to the EEPROM page for more information.
M503
Display EEPROM settings through EEPROM
Refer to the EEPROM page for more information.
M603
Show Free Ram memory
M604
Show Timer 1 COMPA ISR Execution Time Debug Info
M605
Reset Timer 1 COMPA ISR Execution Time Min / Max Values
M606
Show CPU loading information
M607
Reset Peak and Average CPU load values
M608
Show Firmware Version Info
M609
Show last reset flags
M610
Set Extruder Heater Max Current
P: Max current level, from 0% to 100%
Example:
M610 P90 ; Set Extruder Heater Max Current to to 90%
M852
Enter Boot Loader Command
F: Passcode for entering bootloader mode, which is 3464
Example:
M852 F3464 ; Enter bootloader mode
M906
Set current limits for stepper motors
X, Y, Z, E: Max current limit for particular axis (mA)
S: Current sense resistance for motor drivers, Only 100 or 120 is allowed (m Ohm)
Example:
M906 X1600 Y1600 Z1600 E1600 ; Set X, Y, Z, E current limit to 1600 mA
M906 S100 ; Set current sense resistance to 100 m Ohm
M907
Set microstep settings for stepper motors
X,Y,Z,E: 1 for full step, 2 for half step, 4 for quarter step, 16 for sixteenth step
Example:
M907 X16 Y16 Z16 E16
M908
Set GPIO pins with Pin configuration shown below.
(Only applicable to 5DPrint D8 Driver Board)
|---------------------------------------|
|---9-------7---5---3---1---5V------| ISP 6-pin
|---GND---8---6---4---2---GND---| ISP 6-pin
|---------------------------------------|
P: Pin
S: 1 to drive high, 0 to drive low
Example:
M908 P1 S1 ; Set Pin 1 of GPIO pins to 1
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