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G20 G-code
G20 means “all moves starting now have their units specified in inches (imperial units).”
G20’s evil twin is G21, which means “all moves starting now have their units specified in millimeters (metric units),” which is the default when Smoothie starts.
An inch is 25.4 millimeters.
Format
The command is used as such:
G20
Which means: units are now imperial until another G-code changes it (modal command).
Parameters
No parameters.
Further reading
These resources are used as references for Gcode: