After exploring numerous designs, I noticed that many didn't quite fit properly. This led me to take things into my own hands and design a custom Light & Dew Shield using Fusion 360 and share it here for others to enjoy.

The shield will help stop stray lights entering the Seestar and causing extra noise on the sensor, it will help block lights from the side or ground such as near by street lights, it will also help stop dew forming on the front lens. Please make sure to remove prior to packing up your Seestar, I will not be responsible for any damage caused!

I have printed this many times for friends using an X1 Carbon and this fits perfectly, you may need to scale if your printer is not accurately aligned.

Please credit @PixelatedDad if you use this :-)