This model is the bottom shell of a custom Macropad I designed, including 12 programmable keys and a rotary encoder knob. The bottom shell is ideally printed in translucent PETG, pictured is BambuLab's own PETG Translucent in the clear color. The diffusion of the RGB LEDs is very pleasant and the light is diffused evenly when placed down on my desk. Note: the bottom of the case contains recessed circles at each corner for rubber feet to be added.