INTRODUCTION. 3D-printing: An introduction. Energy materials for 3D-printing. Nanoinks for 3D-printing. Functional nanomaterials for 3D-printing. Additives in 3D-printing. Architectural aspects of 3D-printing for improved properties. Methods of characterizations of 3D-printed objects. 3D PRINTING: MATERIALS AND APPLICATIONS FOR ENERGY CONVERSION. 3D printed carbon-based nanomaterials for solar cells. 3D printed graphene for solar cells. 3D printed metal oxides for solar cells. 3D printed MXenes for solar cells. 3D printed MOFs for solar cells. 3D printed nanocomposites for solar cells. 3D printed carbon-based nanomaterials for fuel cells. 3D printed graphene for fuel cells. 3D printed metal oxides for fuel cells. 3D printed MXenes for fuel cells. 3D printed MOFs for fuel cells. 3D printed nanocomposites for fuel cells. Materials and applications of 3D print for solid oxide fuel cells. 3D PRINTING: MATERIALS AND APPLICATIONS FOR ENERGY STORAGE. 3D printed carbon-based nanomaterials for batteries, 3D printed graphene for batteries. 3D printed metal oxides for batteries. 3D printed MXenes for batteries. 3D printed MOFs for batteries. 3D printed nanocomposites for batteries. Materials and applications of 3D print for solid-state batteries. 3D printed carbon-based nanomaterials for supercapacitors. 3D printed graphene for supercapacitors. 3D printed metal oxides for supercapacitors. 3D printed MXenes for supercapacitors. 3D printed MOFs for supercapacitors. 3D printed nanocomposites for supercapacitors. 3D PRINTING: MATERIALS FOR SENSORS. 3D printed carbon-based nanomaterials for sensors. 3D printed graphene for sensors. 3D printed metal oxides for sensors. 3D printed MXenes for sensors.3D printed MOFs for sensors. 3D printed nanocomposites for sensors. 3D PRINTING: MATERIALS AND APPLICATIONS IN BIOMEDICAL. 3D printed carbon-based nanomaterials for biomedical applications. 3D printed graphene for biomedical applications. 3D printed metal oxides for biomedical applications. 3D printed MXenes for biomedical applications. 3D printed nanocomposites for biomedical applications.OTHER EMERGING APPLICATIONS AND FUTURE CHALLENGES. 3D printed nanoinks for light-emitting diodes. 3D printing for thermoresponsive inks. Materials and design aspects of 3D printing for automobile industries. Materials and challenges of 3D printing for defense applications