At each point, the distance sensor probes the height of the Heated Bed, and then the 3D printer records the data. During printing, the 3D printer will automatically adjust its movement, based on the measured data, to keep the nozzle and Print Sheet at an optimum distance.
To switch the calibration grids, tap Settings > 3D Printing > Calibration Grid on the Touchscreen.
This grid is 2 × 2, with 9 points. To apply it, tap 3 and Save.
This grid is 3 × 3, with 16 points. To apply it, tap 4 and Save.
This grid is 4 × 4, with 25 points. To apply it, tap 5 and Save.