This is the well known F puzzle. I just rounded some corners in the base, and fit the 4th F in the base, so you can keep it without spoiling the solution. The sleeve cover is great and looks very cool and thin.

Model is arranged to print in 3 colors in one plate. If you have AMS you can just print everything in one go. Otherwise you can just print by parts.

Here I have other puzzles you may also like:

Symmetry puzzle: https://makerworld.com/en/models/231347

10 cents puzzle: https://makerworld.com/en/models/226564

I will make more puzzles like this. Follow me! :)

Solution: