My version is not exactly how it is in the movie. It's smaller and the inner circles are supposed to connect. It is also supposed to be ~7cm thick. Mine is ~12cm.
Feel free to interpret the measurements.
My interpretation: 25cm diameter, 7cm thick, 7cm ring diameter.
I was limited in foamcore, so I made mine smaller.
Step 1: Materials
-Pic of Lightdisc to copy (Google images)
-Cardboard or Foamcore
-A compass or something round
-Scissors or rasorblade
-Flour and Water
Step 2: Cut Out the Circles
Bend both rings inwards. The two open ends will bend together to form a sloped ring.
Step 3: Tape Circles Together
Step 4: Stuff
Step 5: Optional: Inner Connection
I you did it like me, connect the inner rings with a peice of foamcore to fit the gap. Add more newspaper as you go along.
Step 6: Sanding
You probably won`t get a flush edge where the two outer rings meet. So sand the crap out pf them until they are.
Step 7: Time to Get Messy!
How to: (In case you don`t know)
Add enough water to flour til it had the concistency of thick soup. Rip strips of newspaper and coat them in the flour water mixture. Place the strips on the Lightdisc. Let dry for 12h between coats.
Step 8: Paint
I suggest painting it all black, let it dry, then paint the rings.
I went over the painted rings later with a black marker to make it more perfect. (Again, I am Clu.)
Step 9: Enjoy
And it is safe to throw. Maybe not at anyone. What I'm saying is it won't break like the deluxe Lightdiscs. It might break something if you hit it though.