In my 3D model on Fusion, I made the hole on the box and the connecting piece's stopper the exact same diameter, so that the piece could fit into the hole exactly. Once it was printed, it was really hard to fit the hanger piece into the hole because I made the dimensions exactly the same. If I had made the hanging piece stopper slightly smaller, it would have been a lot easier to fit. I also could have made my holder thinner, as it looks a bit clunky for its purpose of holding something as lightweight as a sponge.
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