How to create a gold part?

Parts are crafted in the Parts Factory Building. You need to make the components and then use the to craft the parts. Each part can be made in various levels from different levels of components.

You will need to have made at least some gold level components to be able to craft a gold level part. The components are made at a low level for free or can be bouts as part of the parts chests for diamonds in the item shop. It takes a lot of components to get up to a gold level so it is a long and difficult process.