The selective curing process is repeated in a layer-by-layer fashion to form 3D structures (Figure ). Importantly, the printing conditions can be customized to meet the crosslinking kinetics of the resin, which form an optically transparent material (Figure ). Unlike typical commercial SLA printers that require a relatively large volume of resins, our printing platform requires a small volume of resin, ~1 mL, as long as the resin is sufficient to form one layer during a printing cycle (Movie S1).