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3D Printing Variable Stiffness Foams Using Viscous Thread Instability.

Jeffrey I Lipton1,2, Hod Lipson1,3

  • 1Cornell University School of Mechanical Engineering, Ithaca NY, USA.

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Summary
This summary is machine-generated.

This study introduces a novel additive manufacturing method to create fine-scale cellular structures using viscous thread instability. This technique enables tunable properties for applications in bioengineering, robotics, and food printing.

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Area of Science:

  • Materials Science
  • Additive Manufacturing
  • Biomaterials

Background:

  • Additive manufacturing (AM) enables cellular structure fabrication for diverse applications like scaffolds and implants.
  • Existing AM methods for cellular structures are limited by printer resolution, focusing on explicit cell design.
  • Current techniques often involve printing designed cells or planning offsets between strands.

Purpose of the Study:

  • To present an implicit method for producing cellular structures via viscous thread instability.
  • To achieve cellular structures with feature sizes finer than the native resolution of the 3D printer.
  • To demonstrate tunable mechanical properties and density of the fabricated structures.

Main Methods:

  • Inducing viscous thread instability during material extrusion.
  • Utilizing this instability to implicitly form complex cellular structures.
  • Characterizing the effective elastic modulus and density of the resulting materials.

Main Results:

  • Successfully produced complex cellular structures at sub-printer resolution.
  • Achieved tunable effective elastic modulus and density spanning two orders of magnitude.
  • Demonstrated the potential for fabricating fine-grained cellular structures.

Conclusions:

  • Viscous thread instability offers a novel approach for advanced additive manufacturing of cellular materials.
  • This method allows for the creation of structures with unprecedented fineness and tunable properties.
  • Fine-grained cellular structures have broad applicability in bioengineering, robotics, and food printing.