Rainbow Runner

This CAD model was designed by Oskar van Deventer, copyright (c), 31 December 2025

Rainbow Runner is a timing puzzle, perhaps the first of its kind. It has six track of six colors and six lengths. The object of the puzzle is to start six marbles with such timing that they all arrive at the same time. If one marble arrives early, it will flip the switch at the end, and prevent the other marbles from finishing. The puzzle is already fairly challenging with two marbles. I solved it once for three marbles. Six marbles is likely humanly undoable.

Here are some links about this design.
https://www.youtube.com/watch?v=3xKdeQluOYw

Feel free to 3D-print an extra sample to give to a friend, as long as you mention the designer and don't charge money.

If you are planning to sell some samples, then please contact me for a license agreement. The royalty fee is 10% of your selling price.

Please do not upload the design to a commercial service, or redistribute the design in any way other than linking to the YouTube video: https://www.youtube.com/watch?v=3xKdeQluOYw

Enjoy!

Oskar
18 April 2026

Contact: 
https://oskarvandeventer.nl/index_contact.php?subject=Print%20It%20Yourself


