Microfluidic Design for Manufacturability
Successful microfluidic manufacturing starts with a design developed around the constraints of the intended production process. Micromolds engineers review channel geometry, wall thickness, draft angles, material requirements and critical dimensions before tooling begins.
Early DFM helps identify filling, demolding, warpage, bonding and tolerance risks before they become costly tooling changes.
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What we help optimize
✓ Microchannel geometry
✓ Wall and feature thickness
✓ Draft angles and demolding
✓ Material requirements
✓ Critical dimensions and tolerances
✓ Production scalability
Microfluidic Design Guidelines for Manufacturing
Microfluidic channel geometry must balance fluidic performance with the practical limits of tooling, polymer flow and demolding.
Channel Dimensions
Maintain a minimum channel size of 50 μm, with 100–200 μm recommended for robust manufacturing and repeatable production.
Aspect Ratio
Design channels with an aspect ratio between 1:1 and 5:1 to improve mold filling and feature replication.
Draft Angles
Apply 1–3° draft angles on vertical walls to simplify demolding while protecting delicate microstructures.
Uniform Wall Thickness
Keep wall thickness consistent and limit channel depth to approximately 70% of the total part thickness to reduce sink marks and warpage.
Corner Radii
Replace sharp internal corners with fillets to improve polymer flow and minimize trapped air.
Designing Microfluidic Chips for Injection Molding
Microfluidic designs intended for injection molding must account for tooling access, polymer flow, gate location, venting, demolding and material behavior. These requirements should be considered before the production mold is manufactured.
Tooling Considerations
✓ Precision micro tooling
✓ Gate location and polymer flow
✓ Micro-venting
✓ Mirror-polished optical surfaces
✓ Prototype and production tooling
Material Selection During Microfluidic Design
Material selection should begin during the design stage because polymer properties affect channel replication, optical performance, chemical compatibility, dimensional stability and downstream bonding.
Micromolds works with thermoplastics including COC, COP, PMMA, PC and PEI for microfluidic applications.
Designing Microfluidic Devices for Bonding and Assembly
Bonding requirements should be defined before the microfluidic design is finalized. Cover-layer geometry, bonding area, material compatibility, surface condition and channel dimensions can all affect sealing performance.
Considering assembly during DFM helps reduce the risk of channel deformation, incomplete sealing and downstream process changes.
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