I think he rather wants to finish a 3D contour with Msurf ?!?!?
you should try the Z-constant in the parameter "spiral"
Then it processes the steep area in a helical motion, assuming
it manages to go around completely in a closed contour,
or try it with the whole strategy ‘Equidistant’.
You can stop the direct feed on the contour with macros at the path beginning and end, then you can approach the contour with the approach radius without feeding directly on the surface.
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