Math Puzzle, Soma Cube

Soma Cube Puzzle (invented by Piet Hein) designed on 123D Design. It turned out to be a great introductory project for anyone to learn about the basic functions of 123D design. It all starts with a cube, which is copied, filleted, doubled, rotated, and merged, multiple times, for the 7 pieces! It is a great puzzle for even little children to develop spatial thinking. By default, each cube is 20mm^3.

References:
1. https://en.wikipedia.org/wiki/Soma_cube
2. Gardner, Martin, 2008. Origami, Eleusis, and the Soma Cube. Cambridge University Press.