RepRap Firmware G-Codes

The RepRap Firmware (abbreviated RRF) does use more G-codes than other firmwares notably because all configuration is done with G-Codes. Another reason is that it does have extended functionalities.

What is presently listed in this page is not the exhaustive list of G-codes interpreted by RepRap Firmware, only the G-Codes which are specific (yet). This list cover DC42 and Chrishamm fork, which are more complete than the original version. Some G-Codes are common between RepRap Firmware and other firmwares, but with extended syntax or specific interpretation. They are listed in a specific paragraph.

With RepRap firmware, everything is G-code

The RepRap Firmware philosophy is that every operation is done with G-code, notably all configuration, which is mainly stored in config.g file, called at board start-up. A set of standard or specifically crafted G-codes macros is written for all commons printer operation.

All G-codes or macros could be send to the board while operating the printer, allowing instant feed-back for any configuration modification. As interactive modifications are lost at next board start-up, the successfully tested G-Codes shall be manually introduced in the configuration file.

This interactive configuration makes the printer tuning easier than with other firmware.

Codes specific to RepRap Firmware

Macros and physical interfacing

• M98: Call Macro/Subprogram
• M99: Return from Macro/Subprogram
• M42: Switch I/O pin Change status of a pin. Hardware dependant - also used by other firmware.
• M571: Set output on extrude - Activate a pin while extruding
• M577: Wait until endstop is triggered
• M581: Configure external trigger Run macro, pause or stop from a pin state change. See expansion connector pinout - NEW -
• M582: Check external trigger Check pin status associated with a trigger - NEW -

Heaters

• M135: Set PID sample interval
• M143: Maximum hot-end temperature - NEW -
• M144: Stand By Your Bed
• M570: Set heater timeout - common to all tools
• M562: Reset temperature fault
• M563: Define or remove a tool

Ethernet communication

• M540: Set MAC address - all printers on same network shall have different MAC addresses
• M550: Set Name - Name for web page call and for FTP
• M551: Set Password - For FTP and Web Control/firmware exchange
• M552: Set IP address - Optional
• M553: Set Netmask - if IP address defined
• M554: Set Gateway - if IP address defined

Miscellaneous Configuration

• M555: Set compatibility - G-code style compatibility
• M558: Set Z probe type
• M566: Set allowable instantaneous speed change - 'jerk' values: speed change while cornering
• M569: Set axis direction and enable values - Change stepper directions without replug
• M906: Set motor currents - digital potentiometers for steppers
• M574: Set endstop configuration
• M572: Set or report extruder elasticity compensation
• M575: Set serial comms parameters - Presently used by PanelDue for communication with the Duet

Web control (DWC)

• M560: Upload web page file
• M998: Request resend of line

Firmware configuration

• M559: Upload configuration file
• M997: Perform in-application firmware update - NEW - firmware update without USB connection

Reporting - also used by DWC

• M36: Return file information Return information about a file on the SD card - JSON format
• M122: Diagnose
• M573: Report heater PWM
• M408: Report JSON-style response - Return printer status data

Geometry

• M208: Set axis max travel
• M556: Axis compensation - X/Y angular correction
• M564: Limit axes
• M579: Scale Cartesian axes - X/Y/Z scale compensation for deltas
• M667: Select CoreXY mode
• M668: Set Z-offset compensations polynomial - in development ?

Miscellaneous commands

• M37: Simulation mode - Run a print simulation for time estimation : slow

Specialised machines

• M567: Set tool mix ratios
• M568: Turn off/on tool mix ratios
• M578: Fire inkjet bits
• M580: Select Roland

G-codes with specific or extended syntax

• G0 & G1: Move - Flags are used to bypass endstops or move carriage on delta
• G10: Tool Offset Define standby and operating tool temperature / Retract if no parameter, see M207 (NEW)
• M105: Get Extruder Temperature
• M106: Fan On - RRF use it to configure controllable fans
• M135: Set PID sample interval
• M141: Set Chamber Temperature (Fast) - in RRF also define the chamber heater
• M207: Set retract length RRF add unretract length parameter - NEW -
• M208: Set axis max travel Used for unretract length in other firmware
• M301: Set PID parameters RRF add PID band, PWM scaling and other parameters
• M302: Allow cold extrudes add cancelling of the command
• M305: Set thermistor and ADC parameters add external thermocouple (using SPI)
• M665: Set delta configuration Add height, maximum usable radius and column angular position
• M561: Set Identity Transform - reset the transformation from calibration

Useful G-codes

• G31: Set or Report Current Probe status Also allow probe offset definition
• G32: Probe Z and calculate Z plane