Gaps in 3d Print

Hi all! I've got an odd problem. I'm very much a "kludge" engineer, so I recently combined some pieces to build a new battery holder. I had a gap, so I made a simple plate using the square shape, used a duplicate of the small object to make a hole, then insert the plate right at the service area of the larger object, and then grouped them together. In TinkerCad, it looks fine. When I export it, however, it's as if my plate isn't there at all. 

Any ideas? 

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