The process of 3D micro printing typically involves a light-sensitive material, often a photopolymer, that hardens when exposed to a focused light source. Techniques like two-photon polymerization use a femtosecond laser to initiate polymerization at the focal point, allowing for the creation of extremely small and precise features. The laser is scanned in three dimensions to build up the structure layer by layer. Advanced software controls the laser's path, ensuring that the desired 3D microstructure is accurately fabricated.
