Three layer puzzle (with rotating pieces)

The aim of the puzzle is to fit the eight pieces into the box.Each of the eight pieces consist of two halves, joined so that they can rotate.The models include three versions of the pieces:- Pieces pre-assembled, but needing supports for the flat overhangs (the other two versions are more reliable).- Pieces separated into two parts, they just need to be pushed together firmly.- Pieces separated into two parts, with markings to show the correct piece pairs, they just need to be pushed together firmly.Make sure when assembling the pairs of parts into the eight pieces that the correct pairs are joined for the puzzle to have a known solution. The halves are paired as neighbours in the STL files to help with the assembly. (Refer to the pre-assembled models if necessary).I have not included the solution here.