Bit doesn't return to center

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bit doesn’t return to the same spot in between bit change out.

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Are you changing bits while the controller has the motors locked? You can set a dip switch to help with that and change a grbl setting. Changing bits moving axis - X-Carve - Inventables Community Forum

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I too had the same problem. I do not know about the unlocking the machine but my solution was that the firmware somehow changed. Be sure that when you look at the settings you have, if you have the same machine as I do, xcarve, ($1=255). That solved my problem to date.