Understanding and improving FDM 3D printing to fabricate high-resolution and optically transparent microfluidic...

Area of Science:

• Materials Science
• Engineering
• Analytical Chemistry

Background:

• Fused Deposition Modeling (FDM) 3D printing faces challenges in fabricating microfluidic devices, particularly concerning microchannel transparency and resolution.
• Current limitations restrict the use of FDM for analytical and bioanalytical microdevices compared to other 3D printing technologies.

Purpose of the Study:

• To systematically enhance the capability of FDM 3D printers for producing transparent microfluidic devices.
• To investigate and optimize printing parameters affecting microchannel quality.

Main Methods:

• Theoretical and experimental analysis of FDM printing parameters.
• Modification of conventional printer nozzles with an airbrush tip (0.2 mm orifice).
• Investigation of extruded layer height and width effects on resolution and transparency.

Main Results:

• A modified nozzle design minimized thermal radiation effects, improving 3D printing resolution.
• Microchannels with an average width of 70 μm ± 11 μm were fabricated.
• Achieved approximately 80% visible light transmission for 640 μm thick devices.

Conclusions:

• The study demonstrates significant improvements in the reproducibility and resolution of FDM 3D printing for microfluidic applications.
• These advancements expand the potential of FDM technology for developing high-quality, transparent microfluidic devices for analytical purposes.