Plumber is a Blender addon for importing Source 1 engine game assets (maps, models, materials, textures) into Blender. It features a hybrid Python/Rust architecture where Python handles Blender integration and UI, while Rust performs performance-critical asset parsing and processing. The addon automatically detects installed Source games on Steam and provides both interactive import operators and a programmatic API for batch processing. Notable for its elegant material node system that cleanly converts Source engine materials to Blender-compatible node materials using a builder pattern with automatic dependency resolution.