Start by calibrating/verifying step/mm, see:
https://docs.carbide3d.com/shapeoko-faq/how-to-calibrate-the-machine-for-belt-stretch/
Note that rather than making lots of 3D pass you could instead use a cove radius endmill though:
Start by calibrating/verifying step/mm, see:
https://docs.carbide3d.com/shapeoko-faq/how-to-calibrate-the-machine-for-belt-stretch/
Note that rather than making lots of 3D pass you could instead use a cove radius endmill though: