I can sit at home and sculpt a block of wax into Yoda. Then I can make that wax into a resin model, all perfectly legally. Or, I can get a machine to make me a

I can sit at home and sculpt a block of wax into Yoda. Then I can make that wax into a resin model, all perfectly legally. Or, I can get a machine to make me a resin model. Why should there be a difference?