Three dimensional space 3D coordinate system

This 3D coordinate system is used in school to teach children a basic understanding of how the three dimensional space can be described using x1, x2 and x3 coordinates.
There are + and - signs for the orientation. The three parts can be put together.

I recommend using paint-on-supports on the big part. You will only need to support the edges. The other two parts can be printed without supports standing upwards.