It helps categorise, manage, and present content effectively, commonly found in applications. About 130mm in width x 30mm in height. An add-on is an optional component, feature, or extension that can be integrated into an existing system. More designs on Printables: https://www.printables.com/@ChrisTech Change Log: 7 November 2023 Create an extension part to link with another partition. 15 November 2023 Fine-tuned the design's tolerance.