I tried to knit all of this surfaces together and creat a solid, but it keep failing to do so. One problem is that three surfaces need to be knitted together (Surface-Plane4, Boundary-Surface2 and Surface-Extrude7) in a singe edge junction, but even if I try to knit every surface exept Surface-Plane4 all together I can't creat a solid. It can only knit those surfaces without creating a solid. I also tried mirroring this surfaces to create a full body and than knitting it toglether but the same problem occurs every time (attachment ''osrednji del''). Does anybody know how to fix this problem?