Modelling Tolerance Settings in Rhino 7 to succesfullty import into Mastercam 2020

Hey,
What is the best modelling tolerances in Rhino 7 for later import into Mastercam 2020. I get a lot of surfaces that are missing on import into Mastercam 2020. I wonder if I shall make changes to my modelling settings in Rhino for improvement on import.

Thanks
David