Cast Rattle Puzzle (by Hanayama)

Some days ago I found some videos on the Youtube channel of "Puzzle Guy" and "RossDM" on the puzzle "Cast Rattle" from Hanayama, that was published at least 7 years ago. Because I found it very interesting, but couldn't find it for 3D printing, I designed it myself.

The goal is to assemble/disassemble the 4 equal parts as shown in the pictures. I think, it's more simple to assemble it first, because You get the right idea. For others, who will disassemble it first, it is more complicated than they may think ;-)