PETG is best, for flexibility in the bumpers, PLA works too but wont be as protective/durable
Use supports
There is a model without bumpers, s20case no bumpers
s20case is the standard model for the bumper case
s20case ace has an ace design on the back that requires the “s20case decal” file to fill for multi material as shown in the image
The author marked this model as their own original creation.