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Kiln serves as an open-source Model Context Protocol (MCP) server and CLI, establishing agentic infrastructure for automated 3D printing. It provides a unified control plane for diverse 3D printer fleets, including OctoPrint, Moonraker, Bambu Lab, Prusa Link, and Elegoo, offering 232 MCP tools for AI-native operation. Agents can seamlessly search for models from marketplaces, auto-slice STL/3MF files, queue prints, and manage jobs, while benefiting from robust safety features like preflight checks, G-code validation, and automatic failure rerouting. Kiln supports printing on local devices, outsourcing to fulfillment centers, and a future distributed peer-to-peer network, abstracting complex physical fabrication processes into a simple, automated workflow.