Inverse Marble Hex

This CAD model was designed by Oskar van Deventer, copyright (c), 23 December 2025

Inverse Marble Hex is a marble track fully filled with marbles. When one inserts a hole at the bottom (by removing a marble), the hole will float all the way up, with marbles going one step down one by one. A fractal hexagonal design was chosen because of uniformity and hence ease of design. At each step, marbles change direction by 60 degrees. This way, marbles always push marbles in front, but not too hard. Also, the design allows for high walls that prevent the marbles from jumping out, which in turn allows a steeper track such that marbles never get stuck.

The marbles are 10 millimeter in diameter. The run should be 3D-printed with three support and zero millimeter spacing between track and support.

Here are some links about this design.
https://www.youtube.com/watch?v=xx
https://www.youtube.com/shorts/UZKHZGdTOWM
https://www.youtube.com/shorts/9AN_rscR5Vk

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=xx

Enjoy!

Oskar
15 April 2026

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


