Hi niko - you've only got 1 rail there - currently in MoI to do that you need to have 2 rails and not just one rail.

Check out Nick's previous post:
http://moi3d.com/forum/index.php?webtag=MOI&msg=3107.3

Download the Frame.3dm attachment there, and delete the surface so you can see how the curves are set up.

Notice that he has 2 outline rail curves. In your file you only have 1 rail. That's the difference.

I am going to be working on making 1-rail sweep in MoI work for that for the next v2 beta but currently you cannot use 1-rail sweep to do that in MoI, you have to use 2 rail sweep instead.

When I do get this working for 1-rail sweep, it will really be more intended that you would place the profile in the middle of the rail as a flat piece rather than in the corner at an angle like in your file. In other words, the main goal for what I'm going to be working on soon will be to work with this kind of layout here:



- Michael