I am trying to save an assembly as an STL for 3D printing. I can save the file but when I open it up in my 3D printing software it shows bodies that I had hidden in my part files. The hidden bodies are crucial to the way the part was constructed so I cannot delete or suppress them. I was wondering if this issue of seeing the hidden bodies occurred when I saved the STL, or if it is happening in my 3D printing software.