3D surface path hangs up on solid surface

[Routerworks]

I tried importing the mesh and analyzing it then closing holes, smoothing surfaces etc. Went through all of the corrections. Still wouldn't work.
I'm assuming once it becomes a solid as you move along an axis (ie. x or y) based on the degree of precision, there is a numerical x,y,z representation of that position? Whether it's a triangular surface or Bezier curved surface. What's the difference.
Just trying to understand this.


Thanks