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Photographs of 3D printed prototype parts with different square pore sizes made of Fe–30Mn powder after sintering: (a) 1-mm length, (b) 500-μm length. Before humble-finished (c) and after tumble-finished (d) miniature human femur [181]; (e) visual inspection in vitro degradation behavior of as-degraded iron scaffolds [183]. Reprint with permission.
