This book presents selected proceedings of the 8th International and 29th All India Manufacturing Technology, Design and Research Conference (AIMTDR 2021). Its compendium of research output pertaining to the fields of additive manufacturing and metal joining. State-of-the-art developments in the above fields such as Fused deposition modelling, Polyjet 3D printing, Metal 3D printing, welded deposition-based technology, and Friction stir welding process for various applications, etc. The contents of this book will be useful for students, researchers as well as industry professionals in the various fields of mechanical engineering.