Hi Pilou, in your last post there it looks like you have forgotten the flatten step.
Switch to a side view (either Front or Right) and flatten those curves to a single plane before offsetting them.
Although it is possible to offset a curve that is non-planar and bending around in 3D usually you do not want to do that because you won't get the corners between pieces to be extended and matching like it will happen in the 2D planar curve case.
So that's your problem - you skipped the flatten step from what I see there.
But did you see my previous post that has the completed model in it?
- Michael
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