I have always been intruiged by puzzles and especially puzzle boxes. I have seen this type of box made out of wood, but I have never been willing to spend the money and buy one. When I saw Make Anything's puzzle challenge, I realized that it was the perfect time to 3D model and print one. The spoiler on how to open this box will be at the bottom of the description.
The best way to print this puzzle is to print the box standing up, and the lid upside down. You can use support in the holes, but it is not necessary. After all of the pieces are printed, you will either need to get 5/16" slingshot pellets, linked here: https://www.amazon.com/Pocket-Shot-Ammo-Slingshot-100/dp/B014AXO7O2/ref=sr_1_4?s=sporting-goods&ie=UTF8&qid=1527362819&sr=1-4&keywords=steel+slingshot+ammo
You could also use 5/16" steel rod cut into 5/16" segments. (This might work better because the edges wouldn't be rounded, but I didn't have any steel rod.)
---From this point on the description contains spoilers---
This box uses centrifugal force to open. The way to open this box is to set it on a table right side up and spin it really fast. This move the pellets out of the inside lining of the box and unlocks it, letting you pull the top off. Here is a video demonstration of the box: