Impossible Dovetail Magnet Puzzle Box

This is my own version of, what I've come to realise, is a commonly known puzzle! I first saw it in this video: https://youtu.be/xp-PENvptu0

I was looking for a little experimental project to learn more about 3D printing and in particular about the clearances needed to make matching parts fit well together. In the end I found that adding a buffer of around 0.15mm on each side between parts works well. As it is, these parts straight off the printer do fit, but very tightly. After some working