Recently, our lab developed a versatile strategy to formulate inks for high-fidelity 3D printing of non-extrudable polymers using low percentages of Carbopol (CBP) as a rheology modifier. CBP is a partially crosslinked polyacrylic acid with a high molecular mass that at low concentrations forms high viscosity gels with shear thinning and thixotropic behaviour. Our previous work showed that the formulation strategy works for biopolymers with different crosslinking mechanisms and is amenable to the incorporation of cells and various additives, resulting in reproducible 3D printed structures with high cell viability. In this manuscript, we build on our previous work by developing GelMA-CBP bioinks for extrusion 3D bioprinting of tissue biomimetic constructs. The bioinks developed present many advantages, including excellent rheological properties for extrusion 3D printing (e.g., shear thinning and thixotropy), biocompatibility, biodegradability, and the ability to 3D print cell-laden structures (Figure ). These new bioinks allow GelMA bioprinting at low concentrations, using low amounts of rheological modifier, and printing at a temperature of 37 ºC while maintaining outstanding printability and cell viability, filling a gap in the 3D bioprinting workflows for GelMA-based bioinks. When culturing 3T3 fibroblasts, high cell viability, cell adhesion, proliferation and spreading were observed. The materials were then used to develop a stretchable lung model incorporating primary human lung fibroblasts to study fibroblast-to-myofibroblast transition. Our work solves the three key issues of GelMA-based bioinks for extrusion 3D bioprinting, by allowing the printing of complex constructs using i) low concentrations of GelMA, ii) low concentrations of additive, and iii) physiological temperatures. Our work lays the foundation for using 3D printable GelMA materials in tissue engineering, regenerative medicine, and implantable medical device applications.