Simple slide together box

I was playing around with different small box designs and decided it would be nice to have one that only required a single piece. My new design allows a single box to be connected to others in order to create larger containers. It was originally designed to hold things like earrings and rings and needed to be able to be printed on a MPMD. The size of each individual box is therefore about 50mm x 50mm
I have included different heights that can be combined into a larger block. The design should allow connecting boxes in a staggered formation as well as corner to corner.

The tolerances on this box are very tight so if your printer is not calibrated accurately parts may not fit together well. I have included a 5mm part that can be used for testing purposes. There is a taper on the bottom of each of the tabs that allow the tabs to fit more easily. This can be deceiving, fit wise, as the smaller heights will fit looser than the taller pieces. Make sure you allow the piece to cool before