The composition of the photopolymer was developed from a baseline PEGDA resin, composed of a 1:3 weight ratio of PEGDA250:PEGDA700. The hydrogel platform varied the PEGDA concentration from 5-15 wt.% in steps of 5 wt.%, and all contained a final LAP photoinitiator concentration of 5 mM. To reduce the dissolved oxygen content and reduce the light dose needed for polymerization, 1 M sodium sulfite was added to a final concentration of 10 mM in all solutions. To improve the viscosity into the usable range for VAM, sodium alginate was added to a final concentration of 0.5 wt.%.