Questions for ‘How to print shape shifters’
![4-D printing](https://www.snexplores.org/wp-content/uploads/2019/11/860-header-questions-4D-Printing_SingleStrandtoCube.jpg)
This black strand (top) folds itself into a box when it's immersed in water. It's an example of 4-D printing, a new technology to print solid objects that interact with the environment.
Self-Assembly Lab/MIT/Stratasys Ltd./Autodesk Inc.