Stellated Diagonal Burr (6 pieces)
There are two variants of this puzzle : one with 6 identical pieces, that must be assembled in two halves, and one with a plain key, that can be assembled like a regular burr.
The end of the pieces can be cut square. The resulting shape really looks like a 'Diagonal Burr', that is, a 6-piece burr with each stick rotated by 45°. It can also be beveled, which gives the more common star shape called 'stellated rhombic dodecahedron'.
For more information, see The Puzzling World of Polyhedral Dissections.
6-piece Stellated Diagonal burr designs