Cuboid frame

This cuboid frame consist of two parts, it makes printing easier and faster - you don't need to create any support.
This is an openscad project so you can easily customize it to your needs.
The included stl file has following dimensions (height, width, length): 50x70x100mm

This project can also be found on github: https://github.com/adamwalach/openscad-projects/tree/master/geometry-teaching-aids