Fabrication of hydrogel discs involved first pipetting 50 µL of photopolymer, followed by subsequent photopolymerization with a dose of 2.7 J/cm 2 at a light intensity of 9 mW/cm 2 within a Luna Crosslinker system (Gelomics, Australia) using a wavelength of 405 nm. Hydrogels were placed in PBS at 37C and allowed to swell overnight to allow of unreacted components to leach out, reaching equilibrium swelling.