This is an iPhone 8 bumper case. It's a tight fit so it will only work with flex filament.
Might also work for an iPhone 7 - I believe it's the same as an iPhone 8 (?)
It's somewhat quick & dirty because I needed a bumper fast. Maybe I will tune this model in the future, although it works suprisingly well... :-)
I printed this with supports, to be sure. Don't know if it would print good without.
Used 40% infill, 0.4 nozzle and 0.2 layer height.