Redmi 13C case is a near identical fit. Note that the brax3 is slightly thicker, meaning that the bumper protection for the screen is not fully there, and the bigger issue is that since the brax3 is thicker, the power button doesn’t exactly line up. This isn’t a problem for using the power button itself, but is a problem for the fingerprint sensor which is integrated with the button. I have removed fingerprint authentication so not always prompted for it.
Otherwise, the cameras, buttons, speaker hole all in the right place. The audio jack is in a different spot (bottom on brax3, top on Redmi 13C. So you will need to drill a hole (bumper is just silicone I think). But I like the acrylic back so I can see the brax innards as intended 
. So an official case is better all around, but I needed a case as I was shipped a used beta build which had no case at all.
This is the case I got for $10 on Amazon
