This 3D printed AA to C battery adapter ring is a simple and cost-effective solution for powering devices that require C-size batteries using standard AA batteries. The adapter securely centers the AA battery inside a C-size outer shell, ensuring proper alignment and stable contact with the device’s terminals. Its lightweight yet durable design makes installation quick and easy—simply insert the AA battery into the adapter and use it like a regular C battery. Compact and reusable, this adapter is perfect for reducing battery costs while increasing flexibility in everyday electronic devices.