Hi Nimi - for version 1.0 MoI does not handle mitering on a rail that has sharp corners in it.

Instead right now it will just sweep each segment of the rail as if it was an individual line segment, that's what gives the result that you are seeing.

But actually for the shape you are creating in this case, I would recommend drawing a vertical profile and then using extrude to punch it out to the side like this:




I am definitely planning on adding in corner mitering for sweep in version 2.0 though, I just didn't have time to get to it for version 1.0 .

- Michael