Contact eddy probe is not enough for non z-offset

I am glad to introduce this new improvement of BDsensor, it can calibrate the sensor automatically after it detects the z offset changed itself by temperature drift or plate changed. Also this is the best solution compare to temperature compensation.

if the plate changed or there are something on the plate or bed temperature changed we still need to recalibrate the eddy probe sensor even we enable the contact feature.

that will affect the bed mesh data or real time level, it may damage your plate in worst case.

Here is the test video that I put another plate on the bed or a paper on the plate.

We can see it automatically recalibrates after homing.