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I printed a empty box with top cover included, or a hollow cylinder with thin shutter in the middle. Since I had no experience, I am getting all loose threads. Come to think of it, it makes sense, the threads had no support except touching the horizontal threads. I guess it needs some sort of support? I see people print cone like vases with sharp tip cut off, and stands on the smaller circle. There must be a limitation on the angle on the cone. If the angle is too wide, the threads will have no support to hang on.?

Anyway, If I need to print a cover onto the part itself, I guess I need a support structure, I am thinking of a wedge. What angle do I need for the wedge?
Or is there a better solution?

thank you,

Andrew

Based on your picture it looks like you could just flip it around, but maybe there's something I'm not seeing. If you do need support material there should be options in your slicing program of choice to auto generate it. On complex pieces I recommend checking the paths first to make sure it was sliced correctly and the support material looks reasonable.

thanks, I figured out, I need to build up a wedge, instead of the flat bridge.