The story behind this set is the following.

Some month ago Chris Lohe told me something about a high price wooden puzzle made by Tom Jolly in 2004. We found a auction in which this puzzle found a new home for more than 400 USD. At the DCD I asked Goetz (he has this puzzle in his collection) for further informations. It was the x-lattice.

After all I tried to built it again. First I started with the DCD give away (small package with 3 color pieces) . I used wooden cubes from the internet (100 pieces less than 10 USD) and glued them together. Afer a little bit sanding it works beautiful.

Than I built a 4x4x4 puzzles names Tetropus. Is works fantastic, too.

But the x-lattice made a lot of problems by putting together. Goetz told me about the tolerances. I designed it with ACad and made a 3d-print of the both pieces. The edges were filleted. Now it works perfect. Nice to play with it.

The best way to design such kind a puzzles is to buy a lot of casino dices (b-ware). They have automaticly the rounded edges you need.

I cannot wait to get my hands on these puzzles!

Btw, not all these "wooden" interlocking puzzles need rounded edges. Sometimes rounded edges can add additional (unwanted) solutions.

Nice builds, Claus! I am curious to see your version of the X-Lattice in reality. The wooden version I have has tight tolerances so that in the starting position you cannot tell where one piece ends and the next starts. On the other hand, it also moves nicely.

From your picture I can see that you achieved a similar effect with the printed version of X-Lattice: I cannot tell where the pieces are separated, and this is how it should be!

Chris, I agree with you about rounding edges and additional solutions coming into the game. There is one 6-piece board burr by Chi-Ren Chen that has solutions with one or two rotations -- the one with one rotation is noticeably longer. Then there would be an additional (much shorter) solution if you rounded the edges a bit more.

However, I don't see how rounding edges might affect "X-Lattice". I doubt that there will be more/shorter solutions with rounded edges for this puzzle, because there is so little space to navigate.