Aha, ok. thanks for the clarification.
I should have a deeper look at it then and see how they implemented this. Summer holiday period is coming up for me and I was hoping to spend some time on my 3D touch probe experiments again (3D touch probe connected to can bus). This could be an alternative. (I’ve gotten the individual parts to work more or less but still need a lot more to get it really usable)
The actual interface needed could be exactly the same, just a different trigger.
I prefer the idea of the touch probe as it also allows to find edges (and thus the center of an object or hole) as well.