FIG. 1.

Digital light projection based 3D printing system setup. A digital mask of the desired geometry is fed into a DMD. Digital masks control the on/off state of each mirror. A collimated UV beam at 365 nm wavelength is reflected off of the DMD chip, through a series of projection lenses into the prepolymer solution. Where the UV light strikes, the prepolymer cures into the desired geometry. Excess prepolymer solution is then washed away so that just the printed structure remains. The printed structure is designed to simulate the “extracellular” space in muscle, and the void space in the structure designed to simulate the “intracellular” space in muscle. DMD, digital micromirror device; UV, ultraviolet.