Do you want to design something to match existing threads on a bottle, or a cap? It turns out there’s an easier way than reaching tiredly for the calipers and channeling one’s inner reverse-engineer.

Randa Lindsey Kachef does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations ...

Do you want to design something to match existing threads on a bottle, or a cap? It turns out there’s an easier way than reaching tiredly for the calipers and channeling one’s inner reverse-engineer.

If you're old enough, you remember the litter-prone, pull-off metal tabs on aluminum cans. And you probably recall when they were replaced by the push-down versions that stay attached to the can. Now, ...