Hi guys,
I have a problem with a design of a Japanese wooden puzzle called "Double Kumiki Puzzle". It's made up of 12 interlocking parts (9 with 2 cutouts and 3 with 3 cutouts).
This video could help:
https://www.youtube.com/watch?v=mEdEhSnNm3g
I just cannot find the cutout's tilting angle.
Note that it's something near 20 degrees.
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