The Lighting Research Center (LRC) at Rensselaer Polytechnic Institute is teaming up with Rich Brilliant Willing (RBW), a growing, Brooklyn-based company that designs and manufactures custom LED fixtures, to develop a novel approach using additive manufacturing for prototyping, concept validation, and manufacturing of functional 3D-printed heat sinks for LED fixtures. LED lighting products require the heat generated by the LEDs and other components to be properly dissipated. High operating temperatures negatively impact long-term performance and system reliability. Additive manufacturing will provide a simpler, faster, and better predictive design cycle to optimize RBW custom products, expanding their design possibilities without compromising performance or profitability. Through LRC outreach activities, the results from this project will benefit manufacturers of lighting and additive manufacturing equipment and materials at large.