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Feedback control systems01:26

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Feedback control systems are categorized in various ways based on their design, analysis, and signal types.
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Related Experiment Video

Updated: Feb 13, 2026

Three-dimensional Printing of Thermoplastic Materials to Create Automated Syringe Pumps with Feedback Control for Microfluidic Applications
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Integrating Optical Feedback Alignment and Fluidic Control for Multiphase Flow-Assisted In Situ 3D Printing.

Guillermo Ramirez-Alvarado1, Katie Passmann1, Areli Romero-Rendon1

  • 1Department of Biomedical Engineering and Chemical Engineering, University of Texas at San Antonio, San Antonio, Texas, USA.

Journal of Separation Science
|February 12, 2026
PubMed
Summary

A new multiphase flow-assisted 3D printing method enables complex microfabrication within microfluidic devices. This technique overcomes stereolithography limitations for advanced lab-on-a-chip applications.

Keywords:
additive manufacturingmicrofluidicsmulti‐material fabricationphotopolymerization

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Area of Science:

  • Microfluidics
  • Additive Manufacturing
  • Biotechnology

Background:

  • Stereolithography (SLA) is a high-resolution 3D printing technique widely used for microfluidic devices and lab-on-a-chip applications.
  • SLA faces limitations in multi-material integration and fabricating complex microstructures within enclosed channels, hindering advanced applications like analytical separation and tissue engineering.

Purpose of the Study:

  • To present a novel multiphase flow-assisted in situ 3D printing method to overcome the limitations of traditional SLA for microfluidic fabrication.
  • To enable precise, high-fidelity, multi-material microfabrication within confined microchannels.

Main Methods:

  • The method utilizes an aqueous two-phase system (ATPS) for sequential layer generation via fluidic confinement.
  • An image-guided alignment system with homography transformation ensures precise projection of printing patterns within microchannels.
  • Viscosity tuning of ATPS phases allows dynamic control over layer thickness and adaptive 3D structure design.

Main Results:

  • Demonstrated dynamic control of layer thickness through viscosity tuning of ATPS printing and blocking phases.
  • Achieved precise mask alignment and high projection fidelity using the image-guided system.
  • Successfully fabricated complex 3D microstructures (pyramids, cuboids, void structures) and multi-material patterns directly within microchannels.

Conclusions:

  • The multiphase flow-assisted in situ 3D printing method offers a versatile solution for spatially controlled, high-fidelity microfabrication in confined spaces.
  • This technique addresses key challenges in microfluidic device fabrication, paving the way for novel lab-on-a-chip applications.
  • Enables advanced microfabrication for applications in analytical separation, tissue engineering, and beyond.