Leiden Researchers 3D Print Brainless Microrobots That Swim and Dodge Obstacles Like Living Animals

Brainless But Brilliant

Researchers at Leiden University have achieved something remarkable: 3D printed microscopic robots that swim and navigate around obstacles just like living organisms — despite having no brain, nervous system, or any form of centralized control.

The microrobots, printed using advanced microfabrication techniques, exploit the physical properties of their design and the surrounding fluid to achieve complex behaviors. When placed in a fluid environment, the robots naturally respond to external stimuli through their geometry alone.

How It Works

The key lies in the robot's asymmetric design and flexible structure. When exposed to controlled fluid flows or external fields, the robots undergo controlled deformations that propels them forward. Their shape enables them to automatically reorient when encountering obstacles, effectively "dodging" without any computational processing.

This approach represents a paradigm shift from traditional robotics, which relies on sensors, processors, and control algorithms. Instead, the Leiden team embraces what researchers call "physical intelligence" — letting material properties and geometry do the heavy lifting.

Why It Matters

The implications are significant for biomedical applications. These microrobots could eventually navigate through biological fluids to deliver drugs, perform minimally invasive procedures, or collect diagnostic samples — all without the complexity and power requirements of traditional robotic systems.

The research was published in the journal Nature Communications and represents a collaboration between the Leiden Institute of Physics and the Leibniz Institute.