A small travel puzzle with its "print in place" box.
There are many solutions to solve it !

The parts are really esay to print
The box is a little bit tougher. You should have a perfectly calibrated printer.
I printed it in in 0.2mm. If you use slic3r, take care to minimize the parameter "Slice gap closing radius" in the advanced print settings section to something like 0.002 mm.
No support.