G10 G-code
Description
G10 means “retract the filament from the hotend using the extruder.”
You need to configure the length to retract in your extruder module’s configuration by setting the retract_length parameter.
By default, most slicing programs will use G1 commands to retract, but this is the more modern way of doing it.
G10’s evil twin is G11, which means “unretract the filament from the hotend using the extruder.”
Conflict with CNC Standard
G10 means "retract" for 3D printers, but it also means other things for CNC mills.This conflict is because the Reprap project chose its Gcode without any consideration for the Gcode standard that had existed for decades, and this despite the fact that the real G10 could have been useful for 3D printers.
Smoothie supports both formats: if you use G10 without parameters it will do the 3D printer thing, and if you use it with parameters it will do the CNC mill thing.
See also: G-code standard on Wikipedia
Format
The command is used as such:
G10
Parameters
No parameters.
Further reading
These resources are used as references for Gcode: