Additive manufacturing processes such as 3D printing offer an effective way to fabricate high-energy-density on-chip energy storage devices, such as microsupercapacitors for self-powered sensor applications. In this study, we have fabricated in-plane microsupercapacitors using 3D-printed MXene negative and Prussian blue positive electrodes on highly porous, 3D-network of laser-scribed graphene current collectors. The 3D-printed electrode structure enables a higher mass loading of approximately 30 mg/cm², providing a high surface area for interaction with the liquid electrolyte. An areal capacitance of 282.7 mF/cm² was achieved at a current density of 1 mA/cm² by the assembled 3D-printed microsupercapacitors. The 3D-printed microsupercapacitors also achieved a remarkably high areal energy density of 88.34 μWh/cm² and a power density of 0.5 mW/cm², which is the highest value reported for devices in the hybrid microsupercapacitor category. This exceptional performance combined with the potential for self-powered sensor applications, demonstrates the promising future of in-plane hybrid microsupercapacitors.