OK I kinda see wahts happening here, although the Z height thing is confusing.
It is missing all points on the periphery because they are inaccessible (must be something to do with probe off-set but????)
My 5x7 resulted in:
( 5,235) (115,235)
0 1 2 3 4
6 | . . . . .
|
5 | . -4.950 -4.980 [-4.965] .
|
4 | . -4.945 -4.995 -4.990 .
|
3 | . -4.945 -4.915 -4.985 .
|
2 | . -4.980 -4.955 -4.880 .
|
1 | . -4.995 -4.990 -4.980 .
|
0 | . . . . .
0 1 2 3 4
( 5, 5) (115, 5)
which looks consistent, but I don't think it actually touched down on any of those points . Aha It drops close to bed with probe retracted and them extends probe to test , then does a proper touch later.
I do not understand why the reference is about -5,although I believe I set the min_Z to -5.0.
The Z homes to +5.4 and BED top is actually Z=0.00