Block and Pin Puzzle
grabcad
My colleague gave me a tiny version of this puzzle, which I initially believed would be simple with just 7 pieces. However, it turned out to be quite challenging due to the numerous incorrect solutions and specific assembly sequence required. The small size of his made it fragile; hence, I decided to enlarge mine (3 inches cubed) using a scrap 2x4 and a 3/16" diameter dowel. Here's a video demonstrating how it works: https://youtu.be/-5t1cAkutJc and this is where you can buy one: http://amzn.to/2z9nIQW
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