Hi,
I guess I must stitch that two structures together. In order to avoid the seams in the rendering. I mirrored the right part and then joined it. The result is not good.
How to stich it in MOI?
Solved.
I swept it without the middle spline. Then in c4d there were a break at an other place. With optimizing the vertices the tolerances were stitched together. Now it is fine.