Very interesting concept. Unfortunately the mint transaction doesn't go through for me. It says it's unable to estimate gas and seems to never complete. You should definitely try and make a full version of this, I can see it becoming a great success especially if it has different shapes and you end up with working 3D model exports.
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That issue will be because your on the wrong network… try switching to rinkaby and doing it again. The transaction should then go through
Sorry probably should have mentioned that I just forgot because I rarely switched networks but when I did I had the exact same issue so I can confirm that will be the problem