A B S T R A C T Ink formulation is one of the main challenges with ceramic 3D printing. Here, we present a new, reactive-colloidal hybrid ink for 3D printing by robocasting of BaTiO 3 -based ceramics. The hybrid ink combines a titanium isopropoxide-based sol-gel base with a colloidal dispersion of powder, here demonstrated with BaTiO 3 both as the sol-gel (by reaction of titanium isopropoxide and barium oxide) and colloidal (by addition of BaTiO 3 powder) parts. Addition of glycerol was

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... y to avoid fast precipitation and poor dispersion of BaTiO 3 from the reaction of BaO and Ti-isopropoxide. With a solid loading of 40 vol% BaTiO 3 , 10 mm tall structures could be printed with minimal deformation from slumping. The BaTiO 3 shows good piezo-, ferro-and dielectric properties after sintering, with a piezoelectric charge coefficient (d 33 ¼ 159 pC/N) in the range commonly reported for BaTiO 3 . The hybrid inks developed in this work are therefore suitable for robocasting of BaTiO 3 -based electroceramics.