The global market size for bone grafts and substitutes is estimated to be about $2.8B, with more than 2 million bone graft procedures performed worldwide each year. Although bone autografts and allografts are widely used, they suffer from a high risk of infections and rejection by the immune system. Additive manufacturing using hydroxyapatite-based scaffolds has been proposed as an alternative that can generate customized 3D-printed patient-specific implantable scaffold structures. However, present processes are incapable of printing with high resolution. Furthermore, the amount of ceramic material within many inks is limited to less than about 30% by weight of the printing ink, which reduces elasticity and structure strength. Furthermore, elevated temperatures are required for printing.