This light blocker clips onto the filament senor on the side of your centarui carbon to block the harsh blue led. It was lighting up my whole room bright enough to see at night when I was tryin to sleep so I just modeled this cover for it. There is also a thin one that in theory will just darken it, but I havent tested it. Make sure to print the thin one on a smooth bed plate to get a full coverage of the bottom side, and set the layer height to something very small (.1 mm or less) to get better results. I printed the one in the photo on a special textured build plate from elegoo (one of the ones in the 3-set of dual-sided build plates for the centauri carbon)