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Related Experiment Video

Updated: Nov 13, 2025

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3D Printing Low-Stiffness Silicone Within a Curable Support Matrix.

Taylor E Greenwood1, Serah E Hatch1, Mark B Colton1

  • 1Department of Mechanical Engineering, Brigham Young University, Provo, UT, 84602, USA.

Additive Manufacturing
|March 15, 2021
PubMed
Summary

This study introduces a novel support matrix for removable embedded 3D printing that cures with silicone ink, preventing uncured material entrapment in solid prints. This advancement enables the creation of complex, freeform geometries with tunable mechanical properties.

Keywords:
additive manufacturingremovable embedded 3D printingsilicone 3D printingultra-low stiffness siliconeultra-soft 3D printing

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Area of Science:

  • Materials Science
  • Additive Manufacturing
  • Polymer Chemistry

Background:

  • Embedded 3D printing utilizes a support matrix to enable printing of low-viscosity inks in freeform geometries.
  • A challenge in removable embedded 3D printing is the entrapment of uncured support material within solid-infill prints.

Purpose of the Study:

  • To develop a support matrix for removable embedded 3D printing that cures upon contact with silicone ink.
  • To address the issue of uncured support matrix being trapped in solid-infill geometries.

Main Methods:

  • Formulation of a novel support matrix designed to cure when mixed with printed silicone ink.
  • Characterization of the rheological properties of the support matrix.
  • Printing and mechanical testing (elastic modulus, elongation at break) of silicone specimens fabricated using the developed support matrix.

Main Results:

  • The new support matrix cures when mixed with silicone ink, effectively preventing entrapment of uncured material in solid-infill prints.
  • Printed silicone specimens exhibited a nearly isotropic elastic modulus.
  • Compared to cast specimens, printed parts showed a decreased modulus and increased elongation at break.
  • A wide range of stiffness and failure strains (50-250%) were achieved across different silicone inks.

Conclusions:

  • The developed support matrix is effective in solving the problem of trapped uncured material in removable embedded 3D printing of solid-infill geometries.
  • This approach allows for the fabrication of complex, freeform silicone structures with tunable mechanical properties.
  • The process demonstrates broad applicability with various UV and addition-cure silicone inks, suggesting potential for diverse applications.