I’ve used PLA material, 0.2mm layer height and a 0.4mm nozzle using 2 perimeters and 20% infill. For the main base I had to use supports up to the layer 20 so make sure you activate that otherwise the speaker hole part will be printed in mid-air. We have 3 parts. The main case which has all sort of spaces inside for the electronics, the top plate where the buttons will go and some feet, so the case will have clearance from the ground. We will also use these translucid 3D printed buttons. I’ve used a grey color filament but you could always spray paint the parts with whatever color you want.