Paper, Projection-based 3D Bioprinting

“Projection-based 3D bioprinting can be summarized as a surface-to-entity forming method. As the printing process begins, the platform firstly goes down and submerges under the liquid material surface, leaving a thin gap between the tank bottoms. This gap, when filled with materials, has the same thickness with each digital slice. Then, the projector sends the image of the first slice through the transparent bottom, illuminating the materials within the image boundary. In a short period, the photocurable liquid material crosslinks and turns into gel state. Subsequently, the platform rises to leave another gap between the first print and the tank bottom. Then, the image of the next slice is projected. The special design of the hydrophobic bottom guarantees that the new print will stick to the platform or the former slice. Finally, as the cycle continues, the whole model will be printed layer by layer. Obviously, with the same process parameters, the printing duration is only determined by the height of the models, and it has nothing to do with the area of each image. Therefore, the PBP method is particularly good at manufacturing large quantities of consistent sample copies.”

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