Microfluidic Chips for Life Sciences-A Comparison of Low Entry Manufacturing Technologies

Area of Science:

• Biochemistry
• Microbiology
• Microfluidics

Background:

• Microfluidic water-in-oil droplets offer pL-nL reaction vessels ideal for biological and biochemical applications.
• Disseminating microfluidic technology requires low-entry barrier methods for rapid prototyping and cost-effective manufacturing.

Purpose of the Study:

• To experimentally compare three additive manufacturing (AM) methods: fused deposition modeling (FDM), inkjet printing (InkJ), and stereolithography (SLA).
• To evaluate the minimum structure resolution limits of these AM methods for non-expert users.
• To assess the suitability of AM-fabricated chips for biochemical and microbiological applications.

Main Methods:

• Side-by-side experimental comparison of FDM, InkJ, and SLA against micromilling (MM) as a benchmark.
• Evaluation of minimum structure resolution in three spatial directions for each AM method.
• Demonstration of functional chips for representative application cases.

Main Results:

• Additive manufacturing methods, particularly SLA, show potential for creating microfluidic devices.
• The study quantifies the resolution limits of FDM, InkJ, and SLA for microfluidic chip fabrication.
• Functional SLA and micromilled chips can replace traditional SU-8 prototypes in specific applications.

Conclusions:

• Stereolithography (SLA) and micromilling (MM) are suitable for fabricating microfluidic chips for life science applications.
• Additive manufacturing offers a viable, low-cost alternative for rapid prototyping of microfluidic devices.
• These findings facilitate the adoption of microfluidic droplet technology in broader laboratory settings.