octopi tip - get a Usb-a power blocker

I really didn't like how my usb connection powered the printer control screen, so rebooting required switching off AND unplugging.

Searched Amazon for "USB a power blocker". Problem solved.

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For one printer I put a button in octoprint to toggle USB port power on the raspberry pi and powered the ramps/Arduino from the pi instead of the 12v printer PSU. Then I could turn off most of the printer right from the web interface.

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