One-step volumetric additive manufacturing of complex polymer structures.

Area of Science:

• Additive Manufacturing
• Photopolymerization
• 3D Printing

Background:

• Layer-based additive manufacturing methods face limitations in speed and geometric complexity.
• Poor surface quality and slow fabrication times hinder the widespread adoption of current 3D printing technologies.

Purpose of the Study:

• To introduce a new volumetric additive fabrication paradigm that overcomes the limitations of layer-based methods.
• To demonstrate rapid, high-resolution 3D printing of complex photopolymer structures.
• To investigate the optimal conditions for volumetric additive fabrication.

Main Methods:

• Utilized holographic patterning of light fields to create volumetric light fields.
• Employed photosensitive resins with low photoinitiator concentrations (~0.1%).
• Illuminated the resins at modest light powers (~10 to 100 mW) for structure solidification.

Main Results:

• Successfully fabricated complex, nonperiodic 3D geometries.
• Achieved fabrication times on the order of seconds (1-10 s).
• Identified optimal resin and light power parameters for efficient volumetric printing.

Conclusions:

• Volumetric additive fabrication using holographic light fields offers a significant advancement over traditional methods.
• This approach enables rapid production of intricate 3D structures with improved geometric control.
• The findings pave the way for faster and more versatile 3D printing applications.