Researchers from University of Colorado Boulder have developed a 3D printing technique with SLA that allows for localized control of an object’s firmness, which can potentially pave way for tissue 3D printing technique. The layer-by-layer printing method with fine-grain and programmable control over rigidity allows the researchers to mimic the complex geometry of highly structured yet pliable blood vessels. The 3D printer used by the researchers is capable of printing biomaterials as small as 10 microns, or one-tenth the width of a human hair.