iPhone 11, 11 Pro and 11 Pro Max cases to be printed with flexible filament. I would recommend scaling it up by around 1% in your slicer, depending on your filament. Make sure to download the correct case that corresponds with your phone. I have not yet printed them myself, but since I used the exact same method as I did for my other cases, which have been printed many times, I am rather sure it will fit well.