How to close the sides of the surfaces?

Hi. I have a challenging situation, where I need to create a quite complicated surface and I can’t figure-out how to close the front and back sides of this geometries to create a solid object.

I tried a lot of things including Network surface but I wasn’t able to find a tool to do this job.

Please see the attached file.

Thank you in advice for any help.

Close surfaces.3dm (297.4 KB)

You could use ExtrudeSurface to extrude the bottom surface all the way to the top surface. Then use BooleanDifference to notch out the piece on the right.

Hello- ExtrudeCrv the bottom curves vertically:


then Trim with your existing surfaces:


then Join


Thank you Pascal. This way it is working. Finally I have a closed solid without naked edges.