Lacen Wolk developed a crafting GUI recipe source filtering feature for the CleverRaven/Cataclysm-DDA repository, focusing on enhancing user experience in the crafting interface. Using C++ and leveraging skills in GUI and game development, Lacen implemented logic that allows players to filter recipes by their source, such as books or NPCs, directly within the crafting menu. This approach streamlined the recipe discovery process by narrowing search results to relevant sources, reducing the time required to locate specific recipes. The work included clear commit messaging and laid a maintainable foundation for future filtering enhancements, though no major bug fixes were recorded.