This puzzle that went viral with over 9 million views of this video:
The puzzle was originally invented by Winston Freer. This version of the 3D puzzle is a miniature version (90mm x 70mm) of the puzzle demonstrated in the video. It is a mind-bending demonstration of apparently impossible geometry.
Since I am not aware of any licensing restrictions, I have decided to sell this model with 100% of proceeds going to the Conjuring Arts Library, a non-profit for the educational benefit of anyone interested in magic. If you do not know how the puzzle works, the solution is elegantly explained in this video: