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Published online by Cambridge University Press: 11 December 2015
We report on a hand-held reactive printing device used to pattern highlyconductive, edible hydrogel wires formed from gellan gum, gelatin, cross-linkersand a common salt (NaCl). The conductivity of the gels when printed (190± 20 mS/cm) closely matched the conductivity recorded for cast systems(200 ± 19 mS/cm). Printing was observed to reduce the elastic modulusand failure strains of hydrogels under compression, but printed gels retainedsufficient integrity for application as flexible conductive lines. Wedemonstrate that hand-held printing can utilize to pattern soft conductorelements within a simple electronic circuit.