Movable joints

Hi, I am new to tinkercad but am trying to make a action figure type model of our work mascot.  my intention was to make it with movable arms and I used a ball-socket joint I found via the community and added it to my model for the shoulders.  When I exported the STL file into cura and filed through the layers it appeared that the joint "fused' with the body part and the outline of the body cut the joint in half basically so it would not be moveable.  I tired exporting it with the shapes grouped and ungrouped and it din't seem to make a difference.  If I exported the shape by itself it was fine.  I was just wondering if there was some option I am missing to put two shapes together without it removing the internal piece?

Thanks in advance


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