4Z-Puzzle

Puzzle description: The 4Z Puzzle is a classic one: Four copies of the Z pentomino should be placed into the tray.

Puzzle difficulty: This is an easy puzzle, nice for beginners. Nevertheless the solution provides an Eureka moment.
If you can read German: Mehr Informationen gibt es in https://welt-der-geduldspiele.blogspot.com/search?q=3D-Druck

Printing instructions:
Print four copies of the Z pentomino and the tray.
Prints are fine with no supports.
I printed the puzzle in PLA at 0.1 mm layer height.
The model STL file was generated using PuzzleCAD: https://www.thingiverse.com/thing:3198014