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To overcome these limitations, a novel whey protein microgels\u2010based granular hydrogel (WMGH) is developed, consisting of uniform, size\u2010controllable microgels (1, 6, and 20 \u00b5m) via protein\u2010polysaccharide segregative phase separation. The smaller microgels enable WMGH to stretch like continuous liquid inks by adjusting printing speed and pressure, achieving high\u2010resolution 3D\u2010printing (200 \u00b5m) with minimal ink spreading (\u22485%) using a 25G nozzle (260 \u00b5m). This allows the fabrication of intricate structures like human ear and aortic valve models. Incorporating a polyacrylamide (PAM) second percolating network transforms WMGH inks into double\u2010network hydrogels (DN\u2010WMGH), showing up to 36 fold increase in toughness (1.45 MJ\u00a0m<jats:sup>\u2212<\/jats:sup><jats:sup>3<\/jats:sup>) compared to PAM hydrogels. Controlling microgel size provides a new approach for tailoring mechanical strength (6\u2013300 kPa) while maintaining durability, exhibiting full recovery after 100 tensile cycles at 100% strain. DN\u2010WMGH from biopolymers demonstrated good compatibility. This high\u2010resolution 3D\u2010printing of robust DN\u2010WMGH replicates the mechanical properties of various tissues, from brain (&lt;10 kPa) to intestine (\u2248300 kPa), demonstrating new possibilities for tissue\u2010mimicking applications in surgical training, implantable devices, and drug\u2010delivery systems.<\/jats:p>","DOI":"10.1002\/smtd.202402103","type":"journal-article","created":{"date-parts":[[2025,5,21]],"date-time":"2025-05-21T01:54:54Z","timestamp":1747792494000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["High\u2010Resolution 3D Printing of Stretchable Granular Hydrogel Filaments for Fabricating Robust and Durable Tissue Phantoms with Tunable Mechanical Strength"],"prefix":"10.1002","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0477-2916","authenticated-orcid":false,"given":"Yifu","family":"Chu","sequence":"first","affiliation":[{"name":"Faculty of Agricultural, Life, 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