ECHO DOT 3, with time watch, which used huge white DEL, has an high intensity , even when you set the low level of light. This is disturbing for the night (my point of view).

With this cover, you can choose to let see the watch or hide it behing 2mm of material.
If you use a dark color for filament, the light will be fully hidden.
If you prefere to still have a look on Time, use withe filament. The light will pass through the 2mm to let see a smooth and soft light....