Crooked Cubes Puzzle

This is my first selfconstructed puzzle for Thingiverse. The cube is not perfect on purpose. I'm happy that it is working very good. If you print the cube four times all of them will fit in the case, although the puzzle is a bit tricky.
If printing at 75% (or 50%) think of scaling the case to 75.75% (or 50.5%) or even more, because of the tolerances. The 100% version has a tolerance of 1 mm.
Have fun.