KIAUH (Klipper Installation And Update Helper) is a text-based user interface (TUI) and CLI tool for managing the Klipper 3D printer firmware ecosystem. It automates installation, update, removal, and backup of core components (Klipper, Moonraker, Mainsail, Fluidd, KlipperScreen, Crowsnest) and a wide range of community extensions (OctoPrint, Telegram Bot, Obico, Spoolman, etc.). The tool runs on Linux systems (primarily Raspberry Pi and similar SBCs) and handles systemd services, Python virtual environments, git repositories, nginx configuration, and system package management. Architecturally, KIAUH is a Python package with a modular design: a core framework provides menu navigation, logging, spinner animations, and a backend abstraction layer for command execution and filesystem operations. Components and extensions are implemented as classes inheriting from BaseExtension, each with install/update/remove methods. The tool supports multiple printer instances via an InstanceManager and uses a custom SimpleConfigParser for round-trip safe manipulation of Klipper-style configuration files. A headless CLI mode enables scripted, non-interactive operation. The codebase demonstrates solid engineering practices: dependency injection for testability, a plugin architecture for extensions, extensive test coverage (pytest with fake backends), and a well-organized package structure. Key reusable assets include the SimpleConfigParser (a standalone, comment-preserving config parser), the backend abstraction (enabling deterministic testing), and the BaseExtension plugin interface. While the tool is actively maintained and widely used, some areas show technical debt such as singleton proliferation, direct subprocess calls in places, and a Python 3.8 baseline that may limit future compatibility.
This repository contains the hardware design files, CAD models (F3D, STEP, STL), and comprehensive documentation for the ERCF v2 (Enraged Rabbit Carrot Feeder version 2), a multi-material filament changer for 3D printers, primarily the Voron ecosystem. It is not a software application in the traditional sense—there is no executable code beyond configuration and scripting guides for Klipper firmware (Happy Hare plugin). The repo provides stl files for printing mechanical parts, CAD source files for modification, detailed assembly manuals (PDF), and step-by-step tutorials for hardware calibration, Klipper installation, and slicer setup. It also includes recommended optional add-ons (buffer, filament cutter, rewinder) and user-contributed modifications. The project is well-structured with clear directory layouts and extensive community support, evidenced by high stars and active issue tracking.