This is the Rubik's Cube I used for my "Really Really Big Rubik's Cube" videos.
It is the biggest of five giant Rubik's Cubes I have made. The others are Maxi Rubik's Cube (~10cm), Giant Rubik's Cube (19.5cm), Giant Rubik's Cube (14cm) and Giant Rubik's Cube (18cm).
I constructed it from one of those factory made 9cm Jumbo Cubes. I wanted to see how large I could make one using this technique. Because of the strain on the mechanism I believe I have pretty much reached the limit. Larger ones are of course possible but most likely they would need a completely custom made mechanism.
The video and final two photos are from a forum post where I used the puzzle to give the illusion that it is much bigger than it really is. No camera tricks or photoshopping was used.
See- http://tonyfisherpuzzles.net
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