Fused Deposition Modeling (FDM) is currently one of the most common consumer 3D printing technologies. Recent developments in FDM printing have led to dramatically faster printers. One of the limiting factors in print speed is the mass of the printhead, which is often reduced by selecting a smaller extruder motor or using a Bowden extruder setup. However, smaller extruder motors offer less torque, limiting filament flowrate, and ultimately, print speed. Similarly, a Bowden extruder can reduce extrusion accuracy and introduce print artifacts. This paper presents a novel motion system that utilizes a belt-driven differential mechanism to remotely drive a direct drive extruder. In this approach, the extruder motor is moved off the printhead, and transfers power to the extruder shaft through belts and pulleys. It greatly reduces its mass, eliminates the need for a smaller motor, and avoids the drawbacks of a Bowden setup. Experimental results show this technique yields a significantly lighter extruder which allows for faster accelerations.