OnePlus 3 Frame/Cover for External Use with GoPro Mount Style
thingiverse
i did it for mine OnePlus3 and the internal size is for OnePlus3 + Ringke Cover (this one http://fave.co/2eiSmRx) but it work with other similar cover too, of course. To complete u need #4 magnets 4x2 mm. I suggest to print in vertical (see the shot) at 0,15 or 0,20.
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