Thanks @aerosurfer, I didn't considered the front led, because it's on the side and any case on Thingiverse cover that part of the camera. If you want to try yourself you can cut away the front bumpers with a blade. If your filamament is black, I really doubt that the led can introduce some reflection in the lens, it's nearly impossibile, because it's covered by the TPU. Probably the camera is not pushed tight to the front bumpers? Can you post some examples of the problem on YT?