Have a look at this video, It will help you understand
https://forum.onefinitycnc.com/t/help-my-toolpath-says-under-or-over-with-videos/1982
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Have a look at this video, It will help you understand
https://forum.onefinitycnc.com/t/help-my-toolpath-says-under-or-over-with-videos/1982