Material extrusion is an additive manufacturing process involving the extrusion of molten material through a heated nozzle moving in the X-Y plane, onto a platform moving in the Z plane. In this study, graphene–polyamide-6 composite filament was successfully extruded and applied as additive manufacturing feedstock using filament-based material extrusion technique. The materials were characterised by melt flow index, mechanical properties, dielectric properties and electromagnetic interference shielding effectiveness in the X-band frequency range. The effect of melt extrusion process on the mechanical properties, dielectric properties and the electromagnetic interference shielding effectiveness of the composites will be compared with compression molded graphene-polyamide-6 composites; and the reasons behind the differences in these properties will be explored.