SD card Structure

File Structure
On the microSD card there are four different folders: gcodes, macros, sys and www. These folders contain all the information the Duet board needs to operate properly. Below is a list of the folders and their purpose.
gcodes: This folder contains .gcode files that can be run by the Duet. If you upload print files through the Duet Web Console or via a microSD card they should be placed in this folder.
macros: Any macro files that you create should be located in this folder. Macros are .gcode files that can be executed to perform a repetetive task more quickly.
sys: Configuration files of the printer. Contains important .gcode files such as config.g which are executed on startup. You will need to change files in this folder regularly.
www: Holds all files necessary for the operation of the Duet Web Console. It is recommended not to mess with the files here unless you are familiar with web development.
Sys Organization
As mentioned before, the sys/ folder contains all sorts of system files. The most important file is config.g. This file is executed on the start-up of the Duet Maestro board in order to configure the Crane settings. If you wanted to add a command to the start-up sequence, you should insert it in config.g. If you take a look at the config.g file you will see the following:
; Configuration file for Duet Maestro (firmware version 2.02RC2 or newer)
; executed by the firmware on start-up
; Created by PrintM3D
; for the Crane Bowden
;
​
M98 Pgeneral.g                   ; Call General Configuration Module
M98 Pnetwork.g                   ; Call Network Module
M98 Pmotion.g                    ; Call Kinematics/Motor Module
M98 Pthermal.g                   ; Call Heater/Fan/Sensing Module
M98 Ptools.g                     ; Call Toolhead Module
Configuration Files:
general.g
network.g
motion.g
thermal.g
tools.g
; general.g
; Created by PrintM3D
; for the Crane Bowden
;
; The file sets initial movement phases and sets compatibility to RRFW.
;
; Logging Settings
;
;M929 P"eventlog.txt" S1  	     ; Uncomment This Line to Enable Event Logging
;
; General preferences
G90                              ; Send absolute coordinates...
M83                              ; Set relative extruder moves
M555 P1                          ; Set firmware compatibility Mode to RRFW
M501
; Network Settings for Duet Maestro
;
; For Crane Bowden
; by PrintM3D
;
​
; Machine name and Password
M550 PCraneBowden                ; Set machine name
M551 Pconductor                  ; Set password
​
; Ethernet Configuration
M552 P0.0.0.0 S1                 ; Enable Network and use Automatic DHCP
;M553 P0.0.0.0                   ; If necessary, set this to your netmask.
;M554 P0.0.0.0                   ; If necessary, set your network gateway.
​
; Enable/Disable Services
M586 P0 S1                       ; Enable HTTP
M586 P1 S1                       ; Enable FTP
M586 P2 S0                       ; Disable Telnet
; motion.g
; Created by PrintM3D
; for the Crane Bowden
;
; This file declares drive kinematics, axis limits, and endstop settings.
​
; Drives
M569 P0 S1 D3 V0                 ; Drive 0 goes forwards
M569 P1 S0 D3 V0                 ; Drive 1 goes backwards
M569 P2 S0 D3 V0                 ; Drive 2 goes backwards
M569 P3 S1 D3 V0                 ; Drive 3 goes forwards
M350 X32 Y32 Z16 E16 I1          ; Set Microstepping
M92 X160 Y160 Z400 E96           ; Set steps per mm
M566 X900 Y900 Z90 E240          ; Set Maximum Jerk (mm/min)
M203 X9000 Y9000 Z1200 E12000    ; Set maximum speeds (mm/min)
M201 X1200 Y1200 Z90 E120        ; Set accelerations (mm/s^2)
M906 X1000 Y1000 Z1000 E1100 I30 ; Set motor currents (mA) and idle
M84 S60                          ; Set idle timeout
​
​
; Axis Limits
M208 X0 Y0 Z0 S1                 ; Set axis minima
M208 X230 Y230 Z250 S0           ; Set axis maxima
​
; Endstops
M574 X1 Y1 Z1 S1                 ; Set active high endstops
; thermal.g
; Created by PrintM3D
; for the Crane Bowden
;
; This file declares heater and fan settings.
; Heaters
M305 P0 T100000 B4006		         ; Thermistor Config for NTC 100k
M143 H0 S120                     ; Set temperature limit for heater 0 to 120C
M305 P1 T100000 B4006   	       ; Thermistor Config for NTC 100k
M143 H1 S265                     ; Set temperature limit for heater 1 to 265C
​
; Fans
; For Crane Bowden: F0 is Heatsink Fan, F1 is Part Cooling fans, F2 is Case Fan
M106 P0 T45 H1 F50                ; Set Heatsink Fan F0 to Thermostatic
M106 P1 H-1 F50                   ; Set Part Cooler Fans F1 to Gcode Control
M106 P2 S0.8 F50                  ; Set case fan always on at 80%
; tools.g
; Created by PrintM3D
; for the Crane Bowden
;
; This file declares tools, bed leveling, and flags settings for override.
M563 P1 D0 H1                    ; Define tool 0
G10 P0 X0 Y0 Z0                  ; Set tool 0 axis offsets
G10 P0 R0 S0                     ; Set initial tool 0 active and standby temperatures to 0C
​
; Manual Bed Leveling
M558 P0
​
T0
"Everything is gcode." 
general.g
network.g
motion.g
thermal.g
tools.g
gcode 
​
G90
Sets coordinates to absolute relative to the origin of the machine.
M83
Sets extrusion values as relative positions.
M555 P1
Sets firmware so as it's input and output is similar to other established firmware. In this case the P argument is 1, for RepRap_firmware.
M501
This allows the stored parameters to be loaded at startup. It can also revert parameters to stored values after experimenting with them.
gcode
​
M550 PCraneBowden
This sets your Machine's Name.
M551 Pconductor
This sets your Machine's Password.
M552 P0.0.0.0 S1
Sets the IP address as well as enable/disables the network interface and allows Automatic for Dynamic Host Configuration Protocol.
M553 P0.0.0.0
This will set up your netmask.
M554 P0.0.0.0
This will set your network gateway. 
M586 P0 S1
Enables Hyper Text Transfer Protocol.
M586 P1 S1
Enables File Transfer Protocol. 
M586 P2 S0
This Disables Telnet, or the network protocol that allows a user on one computer to log onto another computer that is part of the same network.
gcode
​
M569 P0 S1 D3 V0
This will set the motor driver direction, enable polarity and step pulse timing. For in depth explanations of the P, S, D, and V values click Here.​
M350 X32 Y32 Z16 E16 I1
This sets your micro-stepping mode, X, Y, and Z represent the axis, E is the extruder, and I is the micro-step interpolation mode for the specified drivers.
M92 X160 Y160 Z400 E96
This sets axis steps per unit, allowing programming of steps per mm for motor drives.
M566 X900 Y900 Z90 E240
This sets the allowable instantaneous speed change, or "max Jerk" of each motor when changing direction.
M203 X9000 Y9000 Z1200 E12000
This will set the maximum feed-rates that your machine can do in mm/min.
M201 X1200 Y1200 Z90 E120
This sets the max acceleration that axes can do in mm/second^2 for print moves.
M906 X1000 Y1000 Z1000 E1100 I30
This will set the motor currents. Here X, Y, Z, and E, are the drive motor current and I is the motor current idle factor.
M84 S60
This will set the number of seconds of inactivity allowed before the stepper motors will go into idle mode.
M208 X0 Y0 Z0 S1
This will set the minimum limits for axis travel.
M208 X230 Y230 Z250 S0
This will set the max limits for axis travel, these limits when set, are also the assumed positions when an endstop is triggered.
M574 X1 Y1 Z1 S1
This allows for Endstop configuration, which will define the type of endstop the printer has for each axis. 1=low end, 2=high end and the S parameter defines if the input is active high S1 or low S2.
gcode
​
M305 P0 T100000 B4006
This sets the temperature sensor parameters. P is the heater number, T is the thermistor resistance, and B is the Beta value of the thermistor.
M143 H0 S120
This sets the maximum heater temperature. H is the neater number and S is the max temp.
M106 P0 T45 H1 F50
This will set the Fan On configuration. P is the fan number, T is the temperature control range, H enables thermostatic mode and select hearers monitored. F is the Fan PWM frequency.
M106 P1 H-1 F50
This will set the Fan On configuration. P is the fan number, T is the temperature control range, H enables thermostatic mode and select hearers monitored. H-1 disables thermostatic mode. F is the Fan PWM frequency.
gcode
​
M563 P1 D0 H1
This will Define or remove a tool. P is the tool number, D is the extruder drive, and H is the heater.
G10 P0 X0 Y0 Z0
This defines Tool Offsets. P is the tool number, X is the X axis offset, Y is the Y axis offset, and Z is the Z offset squared.
G10 P0 R0 S0
This defines Tool Offsets. P is the tool number, R is the Standby temperature and S is the Active temperature.
M558 P0
This will set the Z probe type where P is the probe type.
T0
This is the activation of tool head Zero
Other Files
In the sys folder you will find many other files which handle other important aspects of the printer. Observe the list below for an explanation of the different files.
config.g: This file is called upon the boot-up of the Duet board. Place G-code commands here in order for them to be executed on start-up. This file calls multiple machine files listed above with the M98 command.
homex.g, homey.g, homez.g and homeall.g: These files operate the homing procedure. Follow Homing the Printer for more help on homing the printer, and Adjusting Homing Macros in order to adjust the homing macros.
pause.g this M25 will pause your print at it's current position.
stop.g when the firmware finishes the moves left in it's buffer, the macro M0 stop.g is called this will lift z axis to make clearance for your print, move the bed forward so the print can be removed, then will turn off the heaters, motors, and any part cooling fan that is in use.
start.g  M23 will select your file and M24 will set your printer to start printing the selected file.
resume.g  M24 this will resume a print that was previously paused. It will resume printing from the point at which it was paused. Use M23 to restart the print from the beginning. 
bed.g is executed when a G32 is called. This command is more widely explained in our Bed Leveling Guide.    ​
sleep.g when the printer has shut down and all the motors and heaters are turned off, sleep.g  M1 can be send which will wake it up again.
Going deeper:
If you would like to learn more about gcode and it's various commands, we recommend starting HERE.

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Firmware/Configuration

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File Structure

Sys Organization

"Everything is gcode."

Other Files

Going deeper: