Cartesian coordinate system snap together

Coordinate System Axes for teaching translations, rotations and other alignments. I have created this object for teaching students Coordinate measuring machine basics. Initially I had used some screws to attach the arrows, but that had a drawback of leaving an ugly hole on the opposite side, so I decided to add a snap fit pin construction. The vertical snap pin needs to be printed separately, because in vertical orientation the pin is simply not strong enough and it will brake when assembling th