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Characterization of 3D printed micro-blades for cutting tissue-embedding material.

Saisneha Koppaka1, David Doan1, Wei Cai1

  • 1Department of Mechanical Engineering, Stanford University, Stanford, CA 94305, USA.

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Researchers precisely fabricated micro-blades using 3D printing to study microscale cutting. Cutting energy decreased with smaller tip radii, plateauing around 357 nm, offering insights into soft material micro-cutting.

Keywords:
3D-printed micro-bladesCutting soft materialsnanoindentation

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Biotechnology

Background:

  • Microscale cutting of soft materials is crucial for applications like single-cell studies and tissue engineering.
  • Understanding the relationship between blade geometry and cutting mechanics is essential but challenging.
  • Precise fabrication of micro-blades with controlled geometries has been a significant hurdle.

Purpose of the Study:

  • To investigate the impact of micro-blade geometry on the indentation cutting of soft materials.
  • To establish a systematic method for studying microscale cutting mechanics.
  • To guide the design of optimized micro-cutting tools.

Main Methods:

  • Utilized Nanoscribe 3D printer for precise fabrication of micro-blades (<1 mm) and blade grid geometries.
  • Employed a custom nanoindentation setup to measure cutting energy during paraffin wax indentation.
  • Systematically varied micro-blade tip radius from ~100 nm to 10 μm and tested various blade configurations.

Main Results:

  • Cutting energy decreased with decreasing micro-blade tip radius, reaching a plateau around 357 nm.
  • Cutting energy showed a plateau despite further reductions in tip radius below 357 nm.
  • For blade structures, cutting energy scaled approximately linearly with the total blade length.

Conclusions:

  • Micro-blade tip radius significantly influences cutting energy, with an optimal range identified.
  • 3D printing offers precise control over micro-blade geometry for systematic mechanical studies.
  • The developed experimental platform can advance the design of microscale cutting technologies for soft materials.