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G17 G-code
G17 means “all commands are now to be interpreted in the XY plane”.
This command essentially changes the meaning (or plane) of the I, J, and K parameters of the G2 and G3 G-codes.
Smoothie starts in the G17 mode (the default plane is the XY plane). However, if you changed the plane with the G18 or G19 commands, you can come back to the “normal” plane with this command.
This command is modal, meaning that once it is executed, all Gcodes after it are now in this now “mode”, until changed by another mode-changing Gcode of its family.
Format
The command is used as such:
G17
Which means: G2 and G3 commands are now in the XY plane.
Parameters
No parameters.
Further reading
These resources are used as references for Gcode: