About this 3D model

This Puzzle is designed based on the squaring the square mathematical problem, but with a new design using pyramids.Squaring the square is the problem of tiling an integral square using only other integral squares. (An integral square is a square whose sides have integer length.)You should solve the puzzle by putting all of the pyramids into the frame. There is only one way to do that!Before printing, please read the printing details section.