3D printing 3-D printing 29 3D printers 24 3D-printing 22 Additive manufacturing 15 Additives 13 additive manufacturing 11 three dimensional printing 11 Printing, Three-Dimensional 9 Hydrogels 6 Tissue engineering 5 Article 4 Compressive strength 4 Costs 4 Fabrication 4 Humans 4 Low-costs 4 Repair 4 chemistry 4 human 4 Biomaterial 3 Compression testing 3 Curing 3 Deposition 3 Drug delivery 3 Industrial research 3 Microfluidics 3 Molds 3 Powder bed 3 Powder metals 3