This is an alternate version of thing:3363747, which is a two piece version of this 1 piece phone case for the Moto G6 phone. It is designed to be printed with a flexible filament such as the SainSmart TPU. Two versions of the case are available here, one with a plain back, and one with a biohazard symbol that my son sketched in. I don't have any pictures of the biohazard versoin at the moment, but will add them when I have them,
Print this in a flexible material. I experimented with a couple of different types and found that the harder flexibles prevented the buttons from working properly, and settled on the SainSmart TPU as a workable choice.
I didn't use supports and things turned out just fine, but you may want to try them to fill the holes in the bottom if your bridging isn't good. Resolution between .15 and .20 should be fine, and infill was almost irrelevant since the top, bottom and perimeter layers make it basically solid.
I just clean up any stringing from the TPU, then push the phone in by putting the button side in first, then popping in each of the corners, very satisfying.