Spheregrity 1

This CAD model was designed by Oskar van Deventer, copyright (c), 1 June 2026

Spheregrity 1 is the ultimate member of the Spheregrity family. In the quest to ever lower number of pieces, Robin Houston joked that one piece would still satisfy the four-notches requirement. He came up with this figure-eight geometry on a sphere. The single piece was made in two colors to highlight its two halfs. PLA is sufficiently flexible to print this "puzzle", but TPU works better. a 2-mm headless screw is used as linking pin to hold the pieces and glue together.

Here are some links about this design.
https://www.youtube.com/watch?v=1-tmM7Pu61c

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=1-tmM7Pu61c

Enjoy!

Oskar
27 August 2026

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


