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I - resistance index position (0-15)
R - resistance value at index (K/W; requires I)
P - power (W)
C - capacitance (J/K)
S - set 0=disable 1=enable
B - beep and warn when reaching warning threshold 0=disable 1=enable (default: 1)
E - error threshold (K/s; default in variant)
W - warning threshold (K/s; default in variant)
T - ambient temperature correction (K; default in variant)
A - autotune C+R values
F - force model self-test state (0=off 1=on) during autotune using current values

M330

Sets up metrics handler

Usage

M330 [ H ]                                   ; Set up metrics

Parameters

H - Prefered metrics handler; Supported handlers are: SYSLOG, UART, SENSOR_INFO_SCREEN

M331

Set specific metric to be reported. If set up of disabled metric is attempted, printer will report error.

Usage

M331 [ M ]                                   ; Set up named metric to track

Parameters

M - Name of metric to be tracked, list of which can be acquired via M333

M332

Disable specific metric

Usage

M332 [ M ]                                  ; Disable named metric

Parameters

M - Name of metric to disable, list of which can be acquired via M333

M333

Lists metrics and whether they are enable or disabled for current handler

Usage

M333                                        ; List metrics

M400 - Wait for all moves to finish M400: Wait for current moves to finish

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Currently three different materials are needed (default, flex and PVA).
And storing this information for different load/unload profiles etc. in the future firmware does not have to wait for "ok" from MMU.

Usage

M403 [ E | F ]

Parameters

E - Extruder number. 0-indexed.
F - Filament type

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In Prusa Firmware this G-code is deactivated by default, must be turned on in the source code. You must define ABORT_ON_ENDSTOP_HIT_FEATURE_ENABLED.

Usage

M540 [ S ]

Parameters

S - disabled=0, enabled=1

M851 - Set Z-Probe Offset M851: Set Z-Probe Offset"

Sets the Z-probe Z offset. This offset is used to determine the actual Z position of the nozzle when using a probe to home Z with G28. This value may also be used by G81 (Prusa) / G29 (Marlin) to apply correction to the Z position. This value represents the distance from nozzle to the bed surface at the point where the probe is triggered. This value will be negative for typical switch probes, inductive probes, and setups where the nozzle makes a circuit with a raised metal contact. This setting will be greater than zero on machines where the nozzle itself is used as the probe, pressing down on the bed to press a switch. (This is a common setup on delta machines.)

Usage

M851 [ Z ]

Parameters

Z - Z offset probe to nozzle.

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Sets the printer IP address that is shown in the support menu. Designed to be used with the help of host software. If P is not specified nothing happens. If the structure of the IP address is invalid, 0.0.0.0 is assumed and nothing is shown on the screen in the Support menu.

Usage

M552 [ P<IP_address> ]

Parameters

P - The IP address in xxx.xxx.xxx.xxx format. Eg: P192.168.1.14

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Initiates Filament change, it is also used during Filament Runout Sensor process. If the M600 is triggered under 25mm it will do a Z-lift of 25mm to prevent a filament blob.

Usage

M600 [ X | Y | Z | E | L | AUTO ]

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Wait for PINDA thermistor to reach target temperature

Usage

M860 [ S ]

Parameters

S - Target temperature

M861 - Set/Get PINDA temperature compensation offsets M861 Set Probe Thermal Compensation

Set compensation ustep value S for compensation table index I.

Usage

M861 [ ? | ! | Z | S | I ]

Parameters

? - Print current EEPROM offset values
! - Set factory default values
Z - Set all values to 0 (effectively disabling PINDA temperature compensation)
S - Microsteps
I - Table index

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Sets the advance extrusion factors for Linear Advance. If any of the R, W, H, or D parameters are set to zero the ratio will be computed dynamically during printing.

Usage

M900 [ K | R | W | H | D]

Parameters

K - Advance K factor
R - Set ratio directly (overrides WH/D)
W - Width
H - Height
D - Diameter Set ratio from WH/D

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Set digital trimpot motor current using axis codes (X, Y, Z, E, B, S). M907 has no effect when the experimental Extruder motor current scaling mode is active (that applies to farm printing as well)

Usage

M907 [ X | Y | Z | E | B | S ]

Parameters

X - X motor driver
Y - Y motor driver
Z - Z motor driver
E - Extruder motor driver
B - Second Extruder motor driver
S - All motors

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In Prusa Firmware this G-code is deactivated by default, must be turned on in the source code. Not usable on Prusa printers.

Usage

M908 [ P | S ]