The core question of Co3Dicology is to gain a deeper comprehension of the historical evolution of medieval bookbindings. This inquiry extends to understanding the intricate technical advancements that transpired from the Carolingian period through the Romanesque and Gothic eras. We seek to unravel why bookbinding techniques did not follow a path of steady progression but instead exhibited sudden and transformative leaps. Furthermore, our aim is to discern the emergence of both monastic and secular binding production practices, the latter initially tentative during the 12th century but gradually solidifying by the close of the Middle Ages in France. To achieve these objectives, our project focuses on an in-depth study of manuscripts as objects, examining their materiality and three-dimensional structures. Through the integration of digital tools we aim to establish a robust methodology that will enable us and others to scrutinise and analyse structural components of the book concealed to the naked eye. Our ambition is indeed to democratise this codicological approach, making it accessible not only to researchers but also the broader public, thus fostering a richer understanding of the historical complexity of medieval bookbinding craftsmanship.