For more information please refer to the original printable.
Onshape modification studio: https://cad.onshape.com/documents/c4bc7a2e91b76e36f67e2b15/w/f9f8d90dcd19b40a7d534b9d/e/05ee5fe404db1d5dee443d74?renderMode=0&uiState=68d7ee2dfb40a4732c6db6a8
The author remixed this model.
Smaller size: 4x4 for smaller print beds (17x17 cm needed).