Arduino Power Plug Barrel Jack Plug Cover
thingiverse
Arduino No-Power Connection Warning: This design prevents plugging in power to your Arduino when you're already using another board that runs on 9V and uses the same 2.1mm/5mm connector. Built with Tinkercad, feel free to customize it online at https://www.tinkercad.com/things/j8w7fTmLxH3.
Download Model from thingiverse
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