After confirming the high printability of the four formulations selected, we printed a 5 mm-tall maple leaf outline, an anatomically sized solid human ear, an anatomically sized hollow nose, and a hollow ghost figurine using 405 nm light and at 37 ºC (Figure ). Increasingly more complex models could be printed as concentration of GelMA was increased, since this improved the robustness of the printed materials. There was a very high fidelity of the printed structures and the models for the biomaterial inks with GelMA contents between 3 and 7%. On the other hand, the maple leaf outline was the only structure accessible to the softest ink (1%GelMA-0.5%CBP-0.5%LAP, Figure ), where the final construct presented acceptable shape fidelity and stability.