Also, I think it's interesting to note that Verdes claimed in the patent that the larger sizes might not work very well with plastic:
It is suggested that the construction material for the solid parts can be mainly plastic of good quality, while for N=10 and N=11 it could be replaced by aluminum.
So I wonder if a plastic 13x13x13 will really even work? If not, I'm guessing it might be even more expensive, and I also wonder if an aluminum cube could ever move very fast.
Still, I have to admit that if a 13x13x13 ever came out, I would want very much to own one, and I would probably be willing to pay pretty much to have it. I'd want to try to BLD it, even if that took all day. (Quick calculation [I hope I did it right] gave 866 pieces, which would be approximately equivalent to 4 7x7x7s! I'd guess that would take 8 or 9 hours on the first attempt.)
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