I normally publish and update all my models at MakerWorld. They are only here on Printables to keep the accounts consistent.

Please download the newest version here at MakerWorld.

Inspired by this YouTube video (spoiler!) I made a 3D printed version. 

Later I found this version here but the .2 tolerance seemed too less for me. This one has 1.2mm tolerance which worked fine for me, especially for printing the box without support. No assembly required. 

I uploaded the parametric Fusion 360 file if you want to change the dimensions. Just go to Modify / Change Parameters to enter your desired values.

The original puzzle seemed to be designed by Yavuz Demirhan. I wasn't able to contact him, so I hope it's okay to post the model here. Otherwise I will delete it immediately.