>>9963166A bin is the name for the boxes in the factory.
Each theme gets a budget. The budget is a amount of Bin storage that the factory uses. A single unprinted element is a bin in storage for the life time of a set. A printed element uses a second bin on top of that. The Armory had around 20 bins of new parts, So did the Sanctum. This is a crazy amount and only Harry Potter has hit around this when it got relaunched.
