Would it be a copyright infringement if I printed cubes on it? Could I print cubes like the Zhanchi just as long as I didn't sell them? What if I designed my own cubes?
Thanks.
Depends where you live. In the UK there's something called the
Private Use Exception, which is in place, for example, to allow music students to copy sheet music, etc.. I don't think copying cubes would be covered by this though, as Private Use Exception is largely for scholarly purposes only.
In the US, there is a similar policy called Fair Use. Again, fair use doesn't cover physical copies, more 'intellectual' copyright.
But it's a moot point really, because this is more a question of patent infringement than copyright.
I'd be very surprised if Dayan, Moyu, etc. challenged you. Firstly, they would have to figure out you've done something. If you make your own cube for yourself, how will anyone ever know? Secondly, they'd have to prove that your design was infringing on their design. It's a tricky and drawn out legal process.
You're only really at risk from prosecution from Seven Towns (who own the Rubik's Cube patent). They police this patent pretty aggressively but, again, they'd have to find out.
There was an interesting
article in the Harvard Journal of Law and Technology calling for a revision to the US patent act to keep up with 'recent' advances in technology (digital printing has been around since the 80s). This is the best overview you'll get on the matter.
Short answer - it's patent infringement. Long answer - you're no more likely to be prosecuted than you are to be prosecuted for copyright infringement for recording a video off YouTube.