Imposible dovetail box-Brain teaser

thingiverse

This is a famous dovetail box, which look impossible to open. This is a brain teaser. A perfect illusion ! because after a long time of thinking, you will be able to open the box. you have to think outside the box ! SPOIL ALERT * * * * * * * * * Thanks to a magnetic pin, we can't open the box. To open it you have to hit itself, to pushdown the magnetic pin. And after you slide the top of the box. added to that, you can add a 10mm (max.) diameter ball to add complexity. A special shape inside the box allow to stop the ball (sometimes) . you need: - 4x magnets (12mm diameter and 2.5mm high) - glue - a 3D printer.. stick the pin between magnets, stick one on the top of the box, and the last one at the bottom of the box. PAY ATTENTION TO THE MAGNETS POLARITY ! after gluing...it's gonna be too late !