SC#159 - Mr. Coffin called this the optimal design of the various Hexsticks varieties. It has a single solution which is serially interlocking and even contains a tricky non-linear move. Moderate to difficult to solve, and a lot of fun.
While it shares the same appearance with the original hexsticks, it is a much more difficult and entertaining puzzle to solve - the difference is that of a standard six piece burr and a level 5 burr (same appearance but very different experience).
I constructed these with the full compliment of notches, which leaves voids in the puzzle and makes assembly even more confusing. Each puzzle is hand waxed, and they were made a bit undersize since it has been dry in the shop lately. The only thing I am not happy about is some burning on some of the angled cuts, which is not visible once the puzzle is assembled.