While I like the board itself, some people might want a cover to diffuse the LED. After some experimentation, I found that white PLA plastic that has the LED flush to the surface actually provides the best diffusion. If there is a dome, the light doesn't diffuse that well, causing uneven brightness as seen in the gallery. Transparent plastic doesn't work that well either when it is printed. If you want to use a clear cover, try using a glass dome meant for circular DIY pendants.

I used 1mm thickness for the plastic.