Sadly, it does not work with closed splines...I get the same error as two years ago:
What I am trying to do, is some railclone objects that are whole buildings, so I can nest them and make my own "parametric library" but with buildings fitiing my needs:
The big problem is that I need to be able to work with "x corners" with threee segments, top, default and bottom, and when I do I always have one corner that is not working. In this case it is not a big problem, but if I had a special corner segment, like a window or something, working with open splines will give me a lot of problems, like overlaping faces and geometry in the end/start corner:
any solution sometime soon?