Useful GCode

GCode is the language fo the machines.. or printers in thsi instance. Marlin is normally the operating system that I like to use and they have an excellent page on the gcode commands available here. 

Other than that here are some useful commands to spit at a printer whether from octoprint's terminal interface or to add to a slicer:

Printer Setup Commands

• Set the Z offset for the probe, or any offset for that matter! link
  • M851 X{0.0} Y{0.0} Z{0.0}
  • Example use: M851 Z-1.27
  • Set the offset for your probe without having to go through the menus, above is the syntax with an example use.
    • X is your left/right, + is to the left and - is to the right, if your probe is left 47mm then your X value is 47
    • Y is your forwards/backwards, + is forwards and - is back, if your probe is 7mm ahead of your nozzle then your value is 7
    • Z is your up/down, - is up and + is down, if your nozzle is .5 a mm above your probe then your value is -.5
    • Note: The direction of your positive and negative is determined by your marlin setup - Don't take the above for granted!
• Save to the EEPROM! link
  • M500
• Load from the EEPROM! link
  • M501
  • These two should be used together regularly when making settings changes just to ensure that these changes are committed properly
• Set the E Steps per unit (Or X, Y or Z) link 
  • M92 E{0.0} T{0.0} X{0.0} Y{0.0} Z{0.0}
  • M92 E97.5

Stepper motor/Hotend control

• Change hotend temperature (link) 
  • M104 S{Temp}
  • M104 S200
•