Can I craft duplicates of the Sticker, if I have the Materials?

Each Sticker in a Sticker Set must be crafted at least once before multiples can be crafted. When a Sticker Set is completed you can return to the Chapter Set to collect additional Materials and craft more Stickers. With each additional multiple of a Sticker, the Material requirements increase. There is a maximum limit of 20 for each Sticker.

(Wilma has to keep her Treehouse Lab tidy!)