Scientists at the University of Amsterdam have developed a striking new 3D-printing method that turns room-temperature water into ice almost instantly, without a freezer or chilled platform. The technique relies on evaporative cooling inside a low-pressure chamber, where water is sprayed as a fine jet, breaks into tiny droplets, and freezes in a fraction of a second.
In a study published in Proceedings of the National Academy of Sciences, Menno Demmenie, Stefan Kooij and Daniel Bonn show how a modified printer can shape ice into delicate forms such as a Christmas tree, tilted pillars and even a human profile. The team says the process is fast, precise and does not require the heavy cooling systems used in earlier ice-printing experiments.
How the method works
At very low pressure, water molecules escape from the liquid surface more quickly, carrying heat away with them. That self-cooling effect drops the temperature enough for the droplets to freeze before they reach the growing structure. In tests, the researchers printed an 8-centimeter ice tree in 26 minutes, then demonstrated more complex shapes by adjusting print speed and movement.
One key insight was that the droplets did not freeze immediately on contact. They stayed liquid for a short moment, merged into lines, and then solidified. That brief window helped the structure hold its shape, even when printed at angles that would normally collapse.
The researchers believe the method could be useful for making disposable molds for microfluidic channels and tissue scaffolds. Because the ice can later be melted away, it may serve as a temporary template for intricate internal pathways. The team also notes that the same physics could one day support future engineering systems in Mars-like low-pressure environments.
This work points to a future where ice is not just a material to preserve, but a programmable building block for advanced manufacturing and space-ready design.
