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Large-Scale Hollow-Core 3D Printing: Variable Cross-Section and Printing Features for Lightweight Plastic Elements.

Matthias Leschok1, Marirena Kladeftira1,2, Yen-Fen Chan1

  • 1Department of Architecture, Digital Building Technologies, ETH Zurich, Zurich, Switzerland.

3D Printing and Additive Manufacturing
|October 3, 2024
PubMed
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Hollow-core 3D printing (HC3DP) enables material savings and faster production. This study explores controlling bead size via air pressure and using custom nozzles for advanced features like bridging and nonplanar printing.

Area of Science:

  • Additive Manufacturing and Materials Science.

Background:

  • Hollow-core 3D printing (HC3DP) offers significant material savings (50-80%) and increased extrusion rates (10x).
  • Current HC3DP research lacks fundamental understanding of its printing capabilities and feature development.

Purpose of the Study:

  • To investigate user-controlled bead dimensions in HC3DP by varying air pressure.
  • To explore the use of bespoke 3D printed nozzles for subdividing hollow extrusion beads.
  • To assess the feasibility of advanced printing features (bridging, cantilevering, nonplanar) using HC3DP.

Main Methods:

  • Printing thermoplastic elements with controlled bead dimensions using positive air pressure.
  • Utilizing custom-designed 3D printed nozzles to modify hollow bead structures.
  • Conducting large-scale experiments to evaluate printing features like bridging and cantilevering.
Keywords:
additive manufacturingbespoke bead cross-sectionhollow-core 3D printinglarge-scale 3D printinglightweighttubular 3DP

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Main Results:

  • Extruded cross-section size is effectively controlled by positive air pressure, enabling variable layer height and width without hardware changes.
  • Bespoke nozzles allow subdivision of hollow beads, opening new design possibilities.
  • Successful demonstration of advanced printing features such as bridging, cantilevering, and nonplanar printing with HC3DP.

Conclusions:

  • HC3DP exhibits fundamental printing behaviors that can be controlled through air pressure and nozzle design.
  • Variable cross-sections and advanced features are achievable, expanding design freedom in HC3DP.
  • The study proposes new research directions for optimizing HC3DP for lightweight and efficient component manufacturing.