[Class : 1] Chemical Composition Used For Preparing Bio Ink; Gelatin ,Collagen, Calcium Phosphate, Hydroxyapatite,Guar Gum, Gellan Gum, Polyethylene Glycol, Alginate, Pluronics, Agarose, Polycaprolactone, Hyaluronic Acid.[Class : 7] 3 D Printers, 3 D Bio Printers