Sphere Puzzle

Sphere 3D Puzzle.
You need three of each stl part to be printed.
Assemble one small part and one large part into one puzzle piece.
With three puzzle pieces, you can make a sphere.
To make a sphere, see the first picture and get a hint.

P.S.
I uploaded a modified version of the second part.
(3DPuzzle_Sphere_Gap_Prt1_Mod.stl)
It has a larger hole to make the assembly easier.