Micro-fibrous structure is one of the reasons why biological soft materials out-performs synthetic soft materials. For example, the alignment of cardiac muscle fibers controls the complex actuation of heart. The reinforcement of collagen fibers leads to the outstanding toughness of cartilage. While it is possible to produce micro-fibrous structure with either high-throughput (e.g. melt blowing), or high-accuracy (e.g. micro-3D printing). It remains challenge to balance the throughput and structural accuracy.
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