▎ 摘　　要

Sustainabi l i t y of 3D printing can be reflected in three main aspects: deployment of renewable inks, recycling of printed products, and applications for energy-and materials-savings. In this work, we demonstrated sustainable vat-photopolymerization (VPP)-based 3D printing in a whole life-cycle process by developing a renewable ink made of soybean oil and natural polyphenols and recycling the ink for reprinting or conver t i n g printed biocomposite to flash graphene (FG) as reinforcing nanofillers in the biocomposite. We also realized its applications in fabricating lightweight, materials-saving 3D structures, acoustic metamaterials, and disposable micro-reactors for time-saving and efficiency-improving synthesis of metal-organic framework nanostructures. In addition to enhancing the tensile strength and Young's modulus of the biopolymers by 42% and 232% with only 0.6 wt % FG nanofillers, respectiv e l y , FG improved the printabi l i t y of the ink in forming 3D tubula r structures, which are usually very hard to be achieved in transparent resin. Success of this work wil l inspire further development for sustainability in 3D printing.