A method of making a customized book via a fully automated process. Various sized customized books are produced via an automated book production system. The automated book production system includes a book block finishing section for preparing a book block to be part of the customized book. The automated book production system also includes a cover finishing section for preparing a cover for the customized book. The book cover is made of a flexible material. The automated book production system further includes a customized book finishing section that combines the book block and the cover to create the customized book. A fully automated customized book production system includes the book block finishing section, the cover finishing section for preparing a cover for the customized book, and the customized book finishing section that combines the book block and the cover to create the customized book.