3-D printing 3D printing 29 3D printers 28 3D-printing 27 additive manufacturing 6 Additive manufacturing 5 Additives 5 Compressive strength 4 Costs 4 Deposition 4 Low-costs 4 Repair 4 Computerized tomography 3 Curing 3 Molds 3 Open-source 3 Scanning electron microscopy 3 Sintering 3 Stiffness 3 Tensile strength 3 ABS resins 2 Body fluids 2 China 2 Compression testing 2 Concretes 2 Contact angle 2 Digital manufacturing 2 Ecosystems 2 Finite element method 2 Fourier transform infrared spectroscopy 2