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All islands must be totally enclosed by a boundary.
Watch out for defining walls that cannot be machined, for example where the wall profiles actually intersect and cross over because of a sharp corner to the pocket boundary:
Note that the wall profile must be a continuous entity if it consists of more than one element.
Because of the sharp corners of the pocket profile, geometry has been created that cannot be machined in the corners:
You can reduce the effects of this problem by using dynamic billeting. Check the box for the Dynamic Billet parameter to create a continuous entity which defines the remaining material. This may be selected for a subsequent pass by a smaller tool.