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Therefore, their feasibility toward various biomimetic applications is currently limited. Herein, Direct\u2010Ink\u2010Writing (DIW) based 3D printable hydrogel ink with broadly adjustable mechanical properties is introduced. The salting\u2010out effect is utilized to effectively lower the gelation temperature of hydrogel inks with a wide range of modulus (0.193\u20131.072\u00a0MPa), making them all 3D printable. As a proof of concept, multi\u2010layered synthetic blood vessels that mimic the mechanical properties of biological blood vessels are printed, and their practicability toward surgical training is demonstrated. The versatility and simplicity of this technique make it highly promising for use in various 3D\u2010printed hydrogel biomaterials applications.<\/jats:p>","DOI":"10.1002\/admt.202400157","type":"journal-article","created":{"date-parts":[[2024,3,16]],"date-time":"2024-03-16T02:29:44Z","timestamp":1710556184000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Hydrogel Ink for 3D Printing with High and Widely Tunable Mechanical Properties via the Salting\u2010Out Effect"],"prefix":"10.1002","volume":"9","author":[{"given":"Kun Woo","family":"Ko","sequence":"first","affiliation":[{"name":"Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology (KAIST)  Daejeon 34141 Republic of 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