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3D-Printed Complex Microstructures with a Self-Sacrificial Structure Enabled by Grayscale Polymerization and
Yibo Liao1, Wenhao Li1, Ziheng Zhan1
1National Research Center for High-Efficiency Grinding, College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, PR China.
ACS Omega
|July 26, 2021
Summary
This study presents a novel method for easily removing support structures in 3D printed complex microstructures. Optimizing support size and grayscale with ultrasonic treatment enables efficient fabrication of delicate suspended designs.
Area of Science:
- Materials Science
- Mechanical Engineering
- Additive Manufacturing
Background:
- Complex 3D microstructures are crucial for applications in microelectromechanical systems, biomedical engineering, and advanced materials.
- Fabricating 3D microstructures with long suspended elements using current 3D printing techniques often requires support structures that are difficult to remove.
- Existing methods for support removal can be challenging, potentially damaging delicate microstructures.
Purpose of the Study:
- To develop a simple and effective method for removing support structures used in 3D printing complex microstructures.
- To enable the fabrication of intricate 3D microstructures with long, unsupported suspended features.
- To provide a versatile technique applicable to various fields requiring precise 3D microfabrication.
Main Methods:
- Utilizing a projection microstereolithography system with a dynamic mask to simultaneously fabricate microstructures and their supports from the same insoluble material.
- Optimizing support structure dimensions (size, height, diameter) and grayscale values.
- Employing ultrasonic treatment in an ethanol solution to facilitate support structure removal.
Main Results:
- Demonstrated that optimized support structures are easily removable without damaging the desired 3D microstructures.
- Found that removal time decreases with increasing support height.
- Showed that support structure integrity (breaking and shearing forces) increases with grayscale and diameter, while ultrasonic cavitation-induced stress concentration drives removal.
Conclusions:
- The proposed method offers a facile approach for removing support structures in 3D printed suspended microstructures.
- Optimized support design and ultrasonic treatment provide a controllable and efficient removal process.
- This technique advances the fabrication capabilities for complex 3D microstructures, opening new possibilities in various technological domains.
