I’ve successfully cut this geometry twice now, but both times it has failed to cut the pockets in the four corners. Corner holes are 3.3mm, the .125" endmill calculates 3.175mm.
@rayjneal, yes, you will need a smaller cutter. Due to the way MeshCAM calculates its toolpaths, you need to use a cutter that is maximum about 90% of the slot or pocket size. And that is assuming you are using the tightest calculation tolerance (I work in inches and use .0001", I think the metric limit is .0025mm. if you can use .001mm that would be better)