yep Im agree with you.No, the banding is from the different layers of material, not print layers. NTPT just kinda looks like this from the side. I 3d print cases and the layer lines are a) much much smaller, and b) not slightly different colours like these layers
i searched at internet, the gen white NTPT case i can see the layer sob sun light or artificial lighting.
but on rep case i can not see this, looks like they got a white plastic parts and print the black color on it.