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@sonderzug Hi, did you share your file on github or thingiverse?
For what it's worth, I think a 3x3 grid for 9 points is probably the lowest you'd really want to go due to the way interpolation between points works, unless your bed is exceptionally flat. And with the railcore, maybe it is.
@james317 what shows in the heightmap tab ? have you done a mesh bed probe?