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We developed a rapid, low-cost 3D fabrication system using digital micromirror device (DMD) projection lithography. This maskless technology creates micro-scale to cm-scale devices, including functional microfluidic systems, without etching or developing steps.

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Area of Science:

  • Materials Science and Engineering
  • Microfabrication Technologies
  • Additive Manufacturing

Background:

  • Traditional microfabrication methods often involve complex, multi-step processes like etching and developing.
  • There is a need for rapid, cost-effective, and scalable systems for creating 3D micro-devices in laboratory settings.
  • Maskless lithography offers potential for direct patterning but scaling to larger areas and 3D structures remains a challenge.

Purpose of the Study:

  • To develop a novel, rapid, and low-cost system for fabricating 3D devices and systems.
  • To leverage digital micromirror device (DMD) projection lithography for micro-scale feature definition and cm-scale object creation.
  • To demonstrate the system's capability in producing functional 3D microfluidic devices.

Main Methods:

  • A maskless lithography system utilizing a digital micromirror device (DMD) for high-resolution pattern projection (up to 10 µm).
  • Image stitching technique to enable fabrication of large area objects (up to 5 cm²).
  • Integration of a z-stage for multi-layer stacking to achieve true 3D structures without post-processing steps like developing or etching.

Main Results:

  • Successful rapid fabrication of various micro-scale objects and cm-scale 3D structures.
  • Demonstration of a fully functioning microfluidic droplet device fabricated using the developed system.
  • Validation of the microfluidic device's integrity through dye pumping experiments, confirming robustness and scalability.

Conclusions:

  • The developed DMD-based projection lithography system offers a robust, configurable, and scalable solution for rapid 3D device fabrication.
  • This maskless, multi-layer stacking approach eliminates the need for traditional developing and etching, simplifying the fabrication workflow.
  • The system's ability to produce functional microfluidic devices highlights its potential for diverse laboratory applications in micro-systems engineering.