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There is a reason why things are the way they are, obviously you are not allowed to sell physical copies of 3d print models and as you mentioned, the only way that can be done is via custom license , and since you didn't provide any details about profit share from selling physical models, I have to assume that you are talking about buying model once and than sell milions of physical copies of it... Can you guess when will artists allow that ?
Why wouldn't they if they want. They can ad that in the licence. Some starting designers would prefer to sell that way and now you can't filter them.
