Hi Pilou, do you mean to use the "Join" command?
For surfaces, join will work to glue together unattached edges between 2 surfaces if the edges are at least within 0.005 units apart or closer to one another.
But maybe with your surfaces in your model here you are trying to use the "Blend" command to create a connecting piece?
If that is the case, then there are some curves and some flat pieces in your model here that are kind of getting in the way, if you delete those then it will be easier for you to pick the correct edge. If you pick a generator curve instead of an edge of a surface, that can prevent getting an edge to edge blend working properly.
Please try the attached version, where I have deleted some of that overlapping curve geometry to make it easier for you to pick the edges.
- Michael
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