Link: https://interestingengineering.com/innovation/hydrogen-storage-tanks-us-mandrel

Scientists have created a 3D-printed mandrel that dissolves in water to make lightweight hydrogen and other high-pressure gas storage tanks.

mandrel /măn′drəl/

noun

1. A spindle or an axle used to secure or support material being machined or milled.
2. A metal rod or bar around which material, such as metal or glass, may be shaped.
3. A shaft on which a working tool is mounted, as in a dental drill.

The American Heritage® Dictionary of the English Language, 5th Edition

I’m guessing it’s a rod

All hail the inanimate mandrel rod!

Did anyone else click the link and get basically just the headline? Like no more information at all on it?

Pretty cool. Thanks for posting, not sure why nothing was coming up for me.