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High-resolution tomographic volumetric additive manufacturing.

Damien Loterie1, Paul Delrot2, Christophe Moser1

  • 1Laboratory of Applied Photonics Devices, School of Engineering, Ecole Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland.

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|February 14, 2020
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Summary
This summary is machine-generated.

Tomographic volumetric additive manufacturing achieves high-resolution 3D printing by using a low-étendue illumination system and feedback control. This ultrafast fabrication method produces complex, centimeter-scale parts with improved geometric fidelity.

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Area of Science:

  • Additive Manufacturing
  • Photopolymerization
  • Optical Engineering

Background:

  • Tomographic volumetric additive manufacturing (TVAM) offers potential advantages over layer-by-layer methods, including higher throughput and broader material compatibility.
  • Current TVAM resolution is limited to 300 µm, hindering the fabrication of intricate structures.
  • Precise control over photopolymerization kinetics throughout the build volume is challenging.

Purpose of the Study:

  • To enhance the resolution of tomographic volumetric additive manufacturing.
  • To improve the geometric fidelity and control of the 3D printing process.
  • To demonstrate the ultrafast fabrication of advanced functional constructs using TVAM.

Main Methods:

  • Implementation of a low-étendue illumination system for TVAM.
  • Development of an integrated feedback system to monitor and control photopolymerization kinetics.
  • Fabrication of centimeter-scale hard and soft parts.

Main Results:

  • Achieved high-resolution features with 80 µm positive and 500 µm negative capabilities.
  • Demonstrated fabrication of centimeter-scale parts in under 30 seconds.
  • Significantly improved geometric fidelity of solidified objects.

Conclusions:

  • A low-étendue illumination system is key to achieving high resolution in TVAM.
  • Integrated feedback control enhances photopolymerization kinetics and geometric accuracy.
  • TVAM is suitable for ultrafast fabrication of advanced, functional constructs with improved resolution.