This box is part of a collection of 6 3*3*3cm puzzle boxes that all have the same theme of lids being removed from boxes through unique and interesting means. They are ranked from 1-6 based on their difficulty even though putting these boxes together and seeing the inside mechanism can remove some of the mystery, they can still be interesting to solve and play with as well as give to your friends to try solve.Video

Printing settings:

supports: none       infill: 15%+       (the case has 2 extremities that can snap off easily so you may want to reinforce it or print it with a higher infill) 

Assembly:

1)Insert the peg into the hole in the lid ensuring that it can slide in and out with ease

2)Holding the lid upside down, slide the case over it diagonally

Solution:

1)Holding the box upside down, slide the lid off diagonally (you might have to try two directions before sliding it off) 

(be careful the pin doesn't fall out and gets lost)