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You don't say what post processor you're using. The line 5 G28 G91 Z0. is actually a move to the machine Z home position so if you've homed your machine it would go to the Z home.

 

If you're using the mach3 post there are options for safe retract if you don't home your machine.

HughesTooling_0-1704186608343.png

 

Mark Hughes
Owner, Hughes Tooling
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