I needed a holder for my Kindle Fire 10HD that would be at 90 degrees as well as not having the camera blocked. I use my Kindle as part of my Octo4A setup, and place it directly behind my printer. The camera is at just the right height to utilize it.
It has been working awesome. I get a notification on my cell while I am at work that my print is done. I double check it with my camera, then I switch the printer off with my Alexa app. (I have my printer plugged into a smart plug.)
Please post a make if you give it a go!
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