Description
Microfluidic device development often demands labour-intensive fabrication and complex control setups. Here, we introduce a fully 3D printed pneumatic valving platform that combines simulation-driven design, flexible filament, and direct-print integration to enable rapid, assembly-free prototyping. Using fused deposition modeling (FDM) with flexible thermoplastic polyurethane (TPU), we fabricate functional valves and microchannels in a single manufacturing step with no post-processing required.
We first characterise the hyperelastic response of printed TPU through mechanical testing, generating accurate material parameters for Finite Element Analysis (FEA). These simulations predict valve deformation and actuation behaviour under varying pressures, giving designers precise control over performance before printing. By adjusting valve geometry, we produce a library of valves that each close at distinct pressure thresholds — all powered from a single, regulatable source. This “pressure-encoded” approach eliminates complex multi-channel routing and reduces control hardware to a single inlet, preserving functionality while simplifying system architecture.
To realise functional devices, we print the TPU structures directly onto an optically transparent substrate using a pick-and-place procedure. This integration offers two advantages: immediate optical accessibility for observing valve dynamics, and rapid validation of simulated behaviours in physical tests. The resulting devices exhibit predictable and tunable valve actuation. The results align well with our predictions using FEA, which confirms the reliability of our model-informed design pipeline.
This method combines material-aware simulation with additive manufacturing to create lightweight adaptive microfluidic systems. By embedding functionally distinct valves into a single pressure domain, we streamline fluidic automation without compromising flexibility or control. This approach not only accelerates the prototyping cycle, but also opens new avenues for accessible, modular lab-on-a-chip systems fabricated entirely through low-cost consumer-grade printing technology.