Figure 1.

Schematic representation of the custom-made low-cost stereolithography with the various components including the computer, projector, lenses, digital micromirror device (DMD), mirrors, objective, and the printed hydrogel. The two lenses form a telescope, which controls the beam size without divergence. The computer program provides the computer-aided design (CAD) model to be printed with planned settings through the projector. The laser allows solidification of the hydrogels through crosslinking layer by layer.