The 3D printing of hydrogels has various advantages, such as design flexibility, rapid prototyping, realization of complex structures, while at the same time it reduces material waste. Most 3D printed soft hydrogels find application as drug delivery systems or in tissue engineering, yet, to form stiff and tough hydrogels through printing of liquid precursor solutions can still be a challenging endeavor. Wu et al. used directed light processing to print stents based on their P(NASC-stat-AAc) polymer networks. The formulation they used in this approach reached outstanding mechanical properties of E = 7 MPa and Γ = 75 kJ/m 2 , which exceeded many of their non-printable competitors. The hydrogen bonding of the tough hydrogels was temperatureresponsive: at 60 °C the urea-carboxyl interactions were broken. For a minimally invasive angioplasty, the hydrogel was first compressed at 60 °C, then fixated at 5 °C, and finally implanted into the blood vessel. At 37 °C, the cytocompatible stent expanded into its original shape and stayed in place, which was supported by cardiovascular simulations of blood vessel stenosis using such a stent.