Flashforge Inventor II User Manual page 26

Leveling Emergency Plan：
Some leveling spare parts may be damaged after being used for a period of time.
Now users could adopt the emergency plan for leveling.
（1）Insert the USB stick to the USB port.
（2）Tighten each of the three knobs underneath the build platform until they go no
further
（3）Tap [Build] on the touch screen, tap the USB icon and then select Leveling.g
file.
（4）Tap [Build], then the build plate and the extruder start moving.
（5）After they stop moving, you can adjust the distance between the build plate and
the nozzle manually. Move the extruder to the position right over the front-left knob,
and adjust the knob individually. Use a A4 paper to check the distance. As you adjust
the knob, make sure the paper just slides between the nozzle and build plate. There
will be somewhat friction on the paper but still can easily pass the paper between the
plate and the nozzle without tearing or damaging the paper.
（6）Then move to the positions right over the right-front and rear knobs successively,
and then adjust the distance according to the descriptions above.
（7）Then move to the center of the build plate for a check. Confirm that the paper
slides between the nozzle and build with a moderate amount friction.
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