Triburrlism, like the Kray Twins is a "diagonal" burr. Consisting of three pieces, it was made by Steve from 3D printing out of ABS resin. My copy (which I acquired from Steve during the IPP35 Puzzle Party) came in three colours with a slightly textured surface. The printing and finishing is very good and the puzzle has a smooth snug fit with nice clean edges. Dimensionally its around 4cm x 4cm x 3cm thick; not a large puzzle by any means, but easy enough handle comfortably.
The Triburrlism came un-assembled and the object is to get the three pieces together to form a symmetrical shape. which must fit inside the tin it came in. While the final shape is not stated, you can roughly tell by examining the pieces and their notches what the solved state is supposed to end up looking like.
Unlike the Kray Twins which I needed Burr Tools help from Steve, I managed to solve the Triburrlism with a bit of persistence and experimentation. From a design standpoint, the Triburrlism, by nature of having just three pieces is a lot easier than the Kray Twins which has six. With just only three pieces, its not too difficult to figure out how the pieces will interlock together in its final shape but getting the moves right for the pieces to mesh properly is the challenging part. Half the number of pieces versus the Kray Twins but IMHO less than half the difficulty. But nonetheless still fairly challenging and this one has a twist to it; two in fact :-). It takes approximately ten moves to fully assemble the puzzle.
Once solved, repeat solving is pretty easy with a bit of practice. If diagonal burrs is what you like, the Triburrlism is a great little puzzle and a good lead up to the Kray Twins! Its available from Steve by request.