Anycubic Mega Zero Allen Key Probe

Edited Nov 2021: Typo and text cleanup. Added probe XY offset determination method using a graph paper. Added video by Ken Sansilo showing the probe in use.

Credit for this inspiration goes to Derokero, https://www.thingiverse.com/thing:4111545

Here's a video by Ken Sanislo showing it in use.
https://www.youtube.com/watch?v=Bhk3W916WUE

This is adapter is for an AnyCubic Mega Zero printer using the supplied 2.4mm Allen-key on a SKR 1.4 Turbo board. Microswitch is wired to the servo probe port. It should work on the stock controller board but you will need to edit the configuration to remove some features to release memory space for mesh levelling.

Deviation test gave 0.001739. Not too shabby for a 20c microswitch.

Marlin Configuration.h settings:

#DEFINE AUTO_BED_LEVELING_BILINEAR

#DEFINE FIX_MOUNTED_PROBE

- To automatically reload bed mesh data is reloaded after G28
#define RESTORE_LEVELING_AFTER_G28

#define LCD_BED_LEVELING

// Useful to d