If the model was printed vertically, the layers are the weakest possible. It's always challenging to get a strong screw thread when dealing with small diameter parts and in this case hollow internal sections. It's like a stack of pennies compressed end-to-end when the stack is pushed out of column. The layers (pennies) crack and everything goes to pieces.

I've seen videos in which the printer operator prints the screw assembly horizontally in order to get the best strength. Unfortunately, this means that the bed is tangent to the thread, and that means very little contact with the bed. The best one I've seen is with a screw that has a segment shaved off along a chord, which provides a much flatter surface to the bed and results in the strongest possible model. For some, this option won't work, as the thread is discontinuous, but that doesn't interfere with anything that has to be attached; it merely looks unusual.