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Periodic lattices have tunable properties and may be manufactured by metallic additive manufacturing (AM) techniques. However, AM can lead to issues with un-melted powder, macro\/micro porosity, dimensional control and heterogeneous microstructures. This study overcomes these problems through a novel technique, combining additive manufacturing and investment casting to produce detailed investment cast lattice structures. Fused filament fabrication is used to fabricate a pattern used as the mold for the investment casting of aluminium A356 alloy into high-conformity thin-ribbed (~\u20090.6\u00a0mm thickness) scaffolds. X-ray micro-computed tomography (CT) is used to characterize macro- and meso-scale defects. Optical and scanning electron (SEM) microscopies are used to characterize the microstructure of the cast structures. Slight dimensional (macroscale) variations originate from the 3D printing of the pattern. At the mesoscale, the casting process introduces very fine (~\u20093\u00a0\u00b5m) porosity, along with small numbers of (~\u200925\u00a0\u00b5m) gas entrapment defects in the horizontal struts. At a microstructural level, both the (~\u200970\u00a0\u03bcm) globular\/dendritic grains and secondary phases show no significant variations across the lattices. This method is a promising alternative means for producing highly detailed non-stochastic metallic cellular lattices and offers scope for further improvement through refinement of filament fabrication.<\/jats:p>","DOI":"10.1038\/s41598-021-84524-y","type":"journal-article","created":{"date-parts":[[2021,3,2]],"date-time":"2021-03-02T11:04:56Z","timestamp":1614683096000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":29,"title":["Macro-, meso- and microstructural characterization of metallic lattice structures manufactured by additive manufacturing assisted investment casting"],"prefix":"10.1038","volume":"11","author":[{"given":"V. H.","family":"Carneiro","sequence":"first","affiliation":[]},{"given":"S. D.","family":"Rawson","sequence":"additional","affiliation":[]},{"given":"H .","family":"Puga","sequence":"additional","affiliation":[]},{"given":"P. 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