The following sketch represents how the protocol flow should be executed as a whole:
Initially, the NFT creator deploys his project on his selected network, therefore allowing the public to mint the stream of available token IDs.
When the creator sets in contact with the T3D Team in order to generate the 3D version of his project, he hands in all the required 3D token files, which in turn will be encrypted by the Team.
Once the 3D NFT smart contract is deployed, the creator collection holders will be able to mint the 3D version of their holdings. They may, as well, receive the 3D version of their token holdings if the creator pursues that strategy.
Holding the same token ID from both projects will entitle the owner to claim a 3D printed version of the NFT.