Is the Touch Screen necessary?

Technically…yes actually.

Here’s the backstory: How to do a larger than 3 x 3 matrix level

The commands to do a 5x5 grid calibration, run via USB, would be
G1029 P5
G1029 A
Set nozzle to correct height via G91 / G0 Z moves or jog in Luban
G1029 S
G1029 D0

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