Double Square Puzzle (remixed)

This is a nice little puzzle :-)
But as already posted in the comments section of the remix original, I wasn't able to resize the parts during printing, so that they would fit. Also I think, the box is much oversized and the square in the middle isn't really a square. So I tried to eliminate these points and created the puzzle myself :-)

The goal is, to fit all 6 parts in the box. The simple solution most people will find very fast, is to fit the small square in the hole of the large part, as shown in the pictures. The second solution isn't quite obvious, and the small square should also fit in the box, so the hole in the large part will be left free :-)