MXenes are emerging materials renowned for their exceptional conductivity, abundant functional groups, and excellent solution processability, making them highly promising as conductive-additive-free inks for flexible electronic devices. However, current preparation methods are hampered by low yields of MXene flakes so that substantial waste MXene sediments (MS) are generated. Here, we demonstrate a type of conductive ink with appropriate rheological properties, namely MG inks formulated using MS and graphene oxide (GO), for screen-printing frequency selective surface (FSS). GO facilitates interlayer interactions by covalently cross-linking with MXene flakes, resulting in a denser structure and significantly enhancing the conductivity of the best-performing MG-based ink to 849 S cm