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G28.1 means “store the origin position that the machine goes to when the G28 command is issued”.

This position is stored into memory, but is lost if the machine is reset. You can make that position permanent by sending the [[M500]] G-code.

Format

The command is used as such :

[code] G28.1 X10 Y10
code]

Which means : record the origin position as being at the X position 10 and Y position 10

Parameters

~ Parameter ~ Usage ~ Example
x Record origin position for X axis G28.1 X10
y Record origin position for Y axis G28.1 Y10
z Record origin position for Z axis G28.1 Z10

Friend G-codes

This G-code sets the origin position that the [[G28]] G-code goes to.

And you can use the [[M500]] G-code to save this position into the http://smoothieware.org/configuring-smoothie config-override permanently.

Further reading