Hello! I had been wanting to make this project for a while, and finally figured things out to implement it. All you need is the Octobuddy plugin and an old NES controller, and a few general electronics tools. It has been a handy way to add in situ controls to my Delta Kossel printer that only had Octoprint for interacting with it, no LCD or touch screen. See my Instructables post here for all the instructions and photos you might want to replicate it for your setup!
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That's cool. Reminds me of the bluetooth x-box one someone made a plugin for.