Can you solve this 3d puzzle? It consists of 18 parts, so seems to be pretty easy. In original size each cube has an edge length of 2 cm (little smaller because of some tolerance), so the whole puzzle is 8 cm long in every direction. The puzzle was designed by Willem van der Poel and is also know as the Van der Poel puzzle.
Difficulty: Tough (nearly unsolvable)
It's a very easy print. The stl file contains all the needed parts. Just separate them, scale them to your size and your ready to print. When placing the parts in the right direction no supports are needed.
The author hasn't provided the model origin yet.