Periodic Table Puzzle

A 3D periodic table puzzle designed to be printed in 3 pieces and assembled. I built it as a school project several years ago and figured someone else might want it. I didn't have much modeling experience then, so the model is bad and I don't really want to go back and fix it. Specifically, the dovetails don't really line up and the whole model is triangulated weirdly It also uses a lot of plastic, with the 3 pieces and over 100 cubes.