Puzzle Ball (4 piece)

Print out 4 identical pieces to assemble a perfect 60mm sphere!

Snapping the 4th piece in its place may be a bit tricky at first, but once secured the whole ball will keep itself assembled until taken apart on purpose.

That was my goal for the design and I reached it with quite a bit of trial and error:
Finding a balance between the piece thickness (2.3mm) and gap between the pieces (0.4mm).