Walnuts are significantly more expensive and less abundant than mainstream biodiesel feedstocks like soybean or rapeseed. This makes them impractical for large-scale biodiesel production unless using waste or surplus oil from food processing. However, in regions with walnut processing industries, repurposing waste oil or defective nuts adds value to the supply chain. The GlobeCore USB system is well-suited for small-scale or localized walnut biodiesel operations, making it a sustainable option in niche or integrated bioenergy systems.