I am trying to make a complex shape in Solidworks and the only thing that I can;t fix is smoothing boundaries between surfaces. The model is based on a 3D sketch. Most of the surfaces are "Filled surface' and some of them "Boundary" When I try to set a tangent edges an error occurs. Also I am not able to make a fillet between surfaces, even after knit to solid body. Please help! Do I need to make changes in 3D sketch?

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