Fun little magic trick I designed after seeing the video I have linked below.

You probably don't need to use superglue for the 2 parts that assemble into a box but you could use it if your tolerances aren't tight enough.

The way it works is that there is a coin already inside the box. As you push the slider (with the other coin) into the box you'll need to turn the box upside down so the coin falls into the first hole. Keep pushing the slider past the halfway point and flip the box upside down again so the coin, the one in the second hole, falls into the slot in the slider and you can pull it out through the opposite side you put it in initially.

You could print in different colours obviously. I don't advise using two colours for the box, since it will be easier to see the “magic” as you turn the box upside down to let the coin fall into the hole .

Will fit on an A1 Mini

The provided print profile is just an standard profile I use for almost all my prints. You could increase the walls and top/bottom but it's not necessary.