Maths has finally discovered a self-righting tetrahedron!

Check out the amazing Bambu Lab printers: https://www.awin1.com/cread.php?awinmid=46345&awinaffid=2412541

Print some maths! https://makerworld.com/en/search/models?keyword=math

Here are the STL files (and project files you can open in Bambu Studio) for the tetrahedrons in this video: https://www.dropbox.com/scl/fo/jwva4zx6r4327lyg9zgy5/AKFZ5nUzo7QmD_mMhaD01uI?rlkey=9f41h2xsb7ybanjh1jibit8mz&dl=0

This is the Quanta Magazine article which broke the Monostable Tetrahedron news in June 2025.
https://www.quantamagazine.org/a-new-pyramid-like-shape-always-lands-the-same-side-up-20250625/

Huge thanks to Gábor Domokos for helping with this video and all of his incredible maths research. Check out his work here: https://scholar.google.com/citations?user=jvULYuYAAAAJ&hl=en

Colin Wright is my maths mate who had the "lost model" all these years. Classic Colin. https://www.solipsys.co.uk/new/ColinWright.html

Steve kindly showed me his Gömböc. In return, he could really use a subscribe on his (excellent) channel: https://www.youtube.com/@SteveMould/videos

Thanks to Jupiter Artland for letting us come and film with the "Cells of Life" landscape sculpture. https://www.jupiterartland.org/

Ayliean's knot prints are from the "Trefoil Menagerie" by Laura Taalman. https://mathgrrl.com/designs/

Huge thanks to my Patreon supporters. They keep me monostable. https://www.patreon.com/standupmaths

CORRECTIONS
- At 12:25 I say B and C both tip on to A. This is incorrect. One tips to A and one tips to D.
- Let me know if you spot anything else!

Filming and editing by Alex Genn-Bash
Additional bad filming by Matt Parker
Written and performed by Matt Parker
Produced by Ayliean MacDonald
Additional production by Nicole Jacobus
Music by Howard Carter
Design by Simon Wright and Adam Robinson

MATT PARKER: Stand-up Mathematician
Website: http://standupmaths.com/