RAISE the printing bed with Babystep Z
Only if the adjustment bolt is fully screwed in but the limit switch is not activated, you can raise the bed further by following these steps:
Press and hold your finger on the yellow button on the microcontroller until you see the 'Babystep Z' menu on the display.
Turn the yellow knob counterclockwise to raise the print bed ( -0.25 mm increments).
Continue adjusting the Babystep Z until the limit switch is activated (red light).
To save the babystep Z value:
Click Motion → Bed leveling → Bed Z → Type the babystep Z value → Scroll down and click 'Store settings'.
Calibration at the four corners of the print bed
This step should be done with adult supervision and assistance.
You can perform this step only after adjusting the distance between the hot nozzle and the center of the print bed.
For more accuracy, you can use a 0.2 mm or 0.08 inch gauge .
Note that you can manually edit each calibration point with the "Edit Mesh" command