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Hi Daniel, first thanks for your help. Now i can select the contour i want, at least so far.

Today i redrew my guitar with more simple operations. The design has been quite easy. And i flipped to manufacture to do a 3D pocket cleaning with a short contour, exactly what i want. And when i click ok, i have that silly warning : "empty tool path" with no help at all. I did a scallop with the same contour, but the tool path stay on the model top plane. Last time it was a problem with the set up, but now i don't see. Set up seems ok. Here is my file : https://a360.co/2UPULpE