This will not extrude....

 From:  Rudy
Hello all.
Rudy here.

Not sure why, but my internal shape will not extrude (with caps).

I had my initial shape, offset it a bit smaller (negative value) to arrive at my internal contour.

I want to make a solid in between the contours, but as the extrernal shape will extrude, the internal one will not, (no caps), so the boolean difference eventually will fail.

Any idea why?


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