There are several ways in which you can get crafting diagrams, such as: victories in PVP battles, drops when defeating special creatures and more. These diagrams are the necessary element for the engineer to generate the corresponding NFT (Minting). They can also be traded within the in-game store
The diagrams are an In-Game object so it cannot be transferred to a wallet, it can only be used to generate new NFTs
The diagrams indicate which will be the object to be made and its rarity. The cost of manufacture according to the Rarity of the item, the diagrams deliver random objects of different types