When I saw the name for this, my mind immediately went to creating an old fashioned "Tea Box". I thought the simple box with it's relatively small obstructions and rather plain "T'" shaped pieces provide quite the challenge, but I felt it could use something to make it look a little fancier. The laser work on the box added a good bit of time, but I thought the end product was work the time. This was Haym's exchange puzzle at IPP a few years ago.
Simply pack the 6 identical pieces into the box and close the lid!
Size: 3.0" x 3.0" x 3.0" ( 7.6cm x 7.6cm x 7.6cm)