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thingiverse

Human beings have a tendency to carry small, portable objects with them, often attached to a chain or strap that can be worn around their neck. This is known as a keychain. Keychains come in various shapes and sizes and serve several purposes. Some are merely decorative, while others hold additional items such as pens, flashlights, or even tools. People use keychains for both practical and sentimental reasons. They may carry them to keep track of keys, but also as a symbol of their personal style or a token from someone they care about.