Edited sentence: Indeed, relying on the layer-by-layer printing technique to support each layer becomes limiting for soft materials like hydrogels, which tend to collapse under their own weight after extrusion of several layers.Since the hydrogel is extruded into a sacrificial hydrogel bath, the latter provides support for each extruded layer.The sacrificial hydrogel also enables cross-linking of the extruded hydrogel, stabilizing the printed scaffold.This extrusion-based bioprinting technique is known as FRESH (freeform embedding of suspended hydrogels), and is proving very useful for creating scaffolds with complex shapes such as human tissue.This technique makes it easier to print free-form shapes, increasing the possibility of printing pores, hollow structures or complex shapes with high resolution