3D Printing Meets Microfluidics: Printed Chip Platform Enables Realistic 3D Cell Cultures

Cells in the human body grow and interact in three-dimensional environments. In biomedical research, however, they are still often cultured on flat plastic surfaces. Such two-dimensional models inadequately represent complex tissue processes. While microfluidic systems have enabled more precise culture conditions, they often rely on external pumps, continuous flow, and complex cleanroom fabrication. A research team at the University of Macau now demonstrates how these hurdles can be overcome using additive manufacturing.

In a study published in 2025 in Microsystems & Nanoengineering, the team describes a digital microfluidic platform specifically designed for three-dimensional cell cultures. At the core of the approach is a single-step micro-nano 3D printing process that allows three-dimensional microstructures to be printed directly onto the chip’s electrodes. Projection-based stereolithography was used to fabricate dielectric layers, confinement structures, and microwell arrays in a single manufacturing step.

Technically, the chip combines classic digital microfluidics functions—such as droplet transport, splitting, and merging—with spatially defined 3D cell niches. To achieve this, the researchers optimized parameters including actuation voltage, electrode geometry, and structure height to ensure stable operation even over uneven surfaces. Cell-laden droplets can be precisely guided into the microwells, where the cells autonomously organize into compact spheroids.

Comparative experiments show that these 3D cell aggregates exhibit significantly more pronounced cell–cell interactions than conventional 2D cultures. Viability and proliferation analyses confirmed stable cell viability for at least 72 hours. Imaging techniques demonstrated a dense, tissue-like architecture that more closely resembles biological in vivo structures.

According to the authors, the direct integration of printed 3D microstructures addresses a key bottleneck in microfluidics. By eliminating multi-step lithography processes, the technology can also be implemented in laboratories without specialized fabrication infrastructure. Looking ahead, the researchers see applications in drug development, cancer research, and organ-on-chip systems, where realistic cell models are critical for robust results.