This is the best Arduino Nano case I've found. This allows me to design a very compact cable dongle that protects the board well. In my application I don't need holes and slots so I fill them with silicone rubber. It would be nice if the two outer layers didn't have holes. On one of the middle layers, I cut the plastic (the end opposite the USB connector) to route a small cable that goes to the DE15 connector that connects to the device I'm connected to. The finished device is very convenient to use and quite durable.
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