https://youtu.be/GwkyUPw8ZAw
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Clever and fun, what's not to like.
More!! Wow, but I want to see how to make the inside cube, start from scratch.
Thank you,
Ralph
It's way easier than I thinked before starting this project. The project consist in same operation on six faces of the cube. Each face you have to bore a stepped hole and cut a two grooves. Only it. The grooves intecept themselfes and form the inner and middle cube. Always cut the inner cube groove first, than the middle cube groove.