The channel manukscreamer on Youtube has a lot of very interesting models made with great skill and handcraft!

Inspired by his short Three chamber magic box I created a version for my 3D printer. Contrary to his wooden version mine doesn't need any additional nails or screws, and has a slightly changed mechanism.

When assembled You can turn the top of the box, and all 3 trays will open/close simultaneously like magic as shown.

With a little care the parts can be assembled and even disassembled again. For assembling please align the 3 trays on top of the bottom part, and the top part as shown in the picture (red arrow), then You can put the pins of the trays in the correct holes (orange arrows) each time by lifting the top a little bit. As soon as all pins are aligned correctly You can press the top completely down and You are ready for the magic :-)