This volume of “IOP Conference Series: Material Science and Engineering” contains the selected papers presented at the 13th International Conference on Development and Modernization of the Manufacturing (RIM 2021), which was held in Sarajevo (Bosnia and Herzegovina) from 29th September to 1st October 2021. Since 1997, the Faculty of Technical Engineering of the University of Bihać has successfully organized and held 13 international scientific conferences RIM on a bi-annual basis in 4 different countries: Bosnia and Herzegovina, Croatia, Egypt, and Montenegro. The main goal of the Conference is to bring together international scientists, engineers, industrialists, and experts providing them a unique platform for sharing new ideas and the recent developments in various areas of engineering. List of Editors, Organization Committee, Scientific Committee, Reviewers are available in this pdf.