Snapmaker Quick Start Manual page 23

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3-in-1 3D Printer Quick Start Guide
Reset the Calibration to Factory Settings
After you detach and reattach the heated bed to the Y axis, use the Reset
button to reset the calibration to factory default settings. It avoids the
nozzle from digging into the heated bed during calibration by moving the
nozzle about 3 mm above the heated bed.
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