Wooden Knot Cross Puzzle, OCC, Three Pieces, Kong Ming Lock

Wooden Knot Cross Puzzle, OCC, Three Pieces, Kong Ming Lock

This is a simple yet fascinating cross knot puzzle of three interlocking pieces. It may have a Chinese origin, dating back to the days of Zhuge Liang (aka. Kongming, AD 181-234). Easy as it looks, it takes a bit of planning in 3D design. One has to make sense of the physical constraints. While the length of each piece is largely arbitrary; its width has to be three times as much as its thickness. Further, one has to consider t