Measure the Speed of Light With Chocolate!

Please DO NOT eat the chocolate. Thank you.
Also I have uploaded a newer design that is more correct. the one shown in the video IS NOT the one I have for download. Sorry for that.
https://www.youtube.com/watch?v=AQ_hTT6ndDY
Hello!
As a part of the one day Project challenge I made a simple kit that you can test the speed of light with!

I had a lot of fun working on this project and I had more trouble that I'd like to admit and had to reprint this many times over.

I'm a 16 years old student from Israel playing for the local robotics FRC team as the head CAD department.

Time to design and tinker: 1 hour
Time to Print: 9 (a few tries)
Clean-up and video making: 2 hours

Have a nice day!