Adafruit USB Isolator Enclosure
prusaprinters
I use Adafruit's USB Isolater (https://www.adafruit.com/product/2107) whenever I'm programming an ESP or similar microcontroller in a live circuit so I don't have to worry about backfeeding power into my computer. It is an ESD-sensitive device and doesn't come with an enclosure though.This simple enclosure snap-fits together and is easy to open. The hole in the middle is used to access the slide switch for low-speed/high-speed device mode.I recommend printing using translucent PETG so the snap-fit tabs are flexible enough and to make it easier to see whether the status LED is lit or not.
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