An imidazolium-based supramolecular gelator enhancing interlayer adhesion in 3D printed dual network hydrogels

•An LMWG compound formed a supramolecular network during extrusion-based 3D printing providing structural support to the monomer.•The monomer in all printed layers is cured simultaneously during post-processing.•Excellent inter- and intra-layered isotropy was achieved in double-network hydrogels.•The tensile properties were close to those fabricated using mould casting.•The gelator fibrillar network was embedded and physically interpenetrated in the polymer structure.