MEDICAL ELECTRONICS


Where conventional methods run out of road


Each established manufacturing process brings genuine capability to micro-scale production, yet each encounters hard technical boundaries that constrain its applicability in high-density electronic assemblies. CNC machining, for instance, offers genuine precision, but subtractive tooling cannot easily reach into internal channels or produce the enclosed, multi- feature geometries that dense electronic assemblies demand. Where uniform wall thickness and tool access are prerequisites, design freedom becomes an early casualty. That said, micro-injection molding offers another route, capable of extraordinary tolerances but at a price. Tooling requires sub-micron precision, extended lead times and significant upfront cost – an economic model that rarely works for low-volume runs. When complex geometries require multiple competing tool designs to test, costs and schedules compound rapidly before a single production part is realised. Unlike machining, where a change in geometry requires only a new program, a change in molding requires a new tool.


Alternative additive methods occupy opposite extremes. Fused deposition modelling is fast and affordable, but delivers low-precision parts with surface quality that falls well short of what miniaturised electronic housings require. Two-photon polymerisation, at the other end, achieves ultra-high precision, arguably the finest currently available, but throughput becomes the constraint. For any meaningful production volume or rapid iteration cycle, the process simply cannot keep pace.


What emerges from this landscape is a consistent trade-off: precision or speed, complexity or cost, design freedom or manufacturability. For engineers developing miniaturised medical electronic housings, these trade-offs have long defined the boundaries of what is achievable with conventional manufacturing techniques. Micro 3D printing fundamentally reframes this equation, delivering a paradigm in which high-resolution, micro-scale geometry and production-viable throughput are no longer mutually exclusive.


Micro 3D printing: Precision without compromise


At the heart of micro 3D printing’s advantage is its additive logic – geometry is built up layer by layer, eliminating the tooling dependency that makes conventional processes so costly and inflexible at small scales. Where injection molding and precision machining grow


progressively harder and more expensive as features shrink, micro-scale 3D printing maintains exacting precision without requiring tooling for every design iteration. Our own Projection Micro Stereolithography (PµSL) technology perfectly exemplifies this capability. It operates across a broad resolutions range, from a 10-micron pixel class to 2-micron resolution for the most demanding geometries. This enables features such as 50-micron holes – structures that would be impractical to achieve through molding or drilling. Tolerances of ±10 to 25


microns place these systems in the same performance bracket as high-resolution micro-injection molding and CNC machining, but without the upfront tooling investment that renders those processes prohibitive for low-volume production and iterative development work.


Because the process builds additively, design freedom follows naturally. Internal fluid paths, thin walls and tightly packed feature sets all become achievable within a single part. The constraints that govern machining and molding (draft angles, uniform wall thickness, tool access) largely fall away. The result is also a faster development cycle. Designs can be iterated in days rather than months, with the same platform bridging seamlessly from prototyping into initial production. In a regulated industry where every qualified iteration carries weight, that compression represents a structural advantage. This is demonstrated by RNDR Medical, which specialises in advanced medical devices. Using PµSL technology, the team was able to develop 3D printed distal tips that moved from design iteration to pre- clinical evaluation in half the time, bypassing the delays inherent with micro molding entirely.


From bench to deployment: Accelerating the path to clinical reality


The breadth of applications where the attributes of micro-precision 3D printing directly address manufacturers’ needs spans the full range of medical electronics. In


point-of-care diagnostics, micron-accurate microfluidic channels enable compact, portable analysis platforms. Wearable biosensors benefit from the dense integration of sensing elements within thin, skin-contact form factors. Electronic drug delivery systems rely on precisely defined fluidic pathways and micro-features to govern dosing. Medical imaging demands housings and optical mounts fabricated to exacting tolerances. And implantable electronics require biocompatible materials, miniature footprints and complex internal geometries that additive micro- fabrication is uniquely positioned to provide. The microfluidics case illustrates the precision demands particularly well and is exemplified by a joint project undertaken by Germany’s Goethe University Frankfurt and Technical University Darmstadt. This saw researchers use our micro-precision technology to produce serpentine micromixer chips – compact microfluidic devices with tightly curved, winding channels that induce controlled mixing at the microscale – for real- time in situ imaging of nanocarrier formation. Complexity of a different kind drives the work at NYU Abu Dhabi, where researchers developed SPIRAL - Strategic Precision Infusion for Regional Administration of Liquid – a helical intracerebral microfluidic catheter designed to distribute therapeutic agents across broader brain regions through a single insertion. The goal was to reduce the tissue trauma associated with multiple straight- catheter placements while maintaining precise, uniform flow across multiple outlet ports. 3D printing the catheters featured 0.3-millimeter walls and multiple 88.45-micron outlet ports. Alternative fabrication methods lacked the dimensional accuracy required to ensure uniform flow distribution - the parameter central to the device’s clinical performance. In vivo testing confirmed no increase in gliosis or inflammation, validating both the design and the production approach.


The direction of travel


Medical electronics has always advanced by demanding the impossible and micro- precision 3D printing is now the technology meeting that demand. Where miniaturisation and geometric complexity once forced engineers into compromise, this technology removes the constraint entirely, unlocking a new class of devices that simply could not have been built before.


The devices that will shape the next chapter of medical electronics are already being imagined — and the manufacturing infrastructure to realise them is now precise, scalable and engineered to meet the exacting demands of next-generation applications.


JULY/AUGUST 2026 | ELECTRONICS FOR ENGINEERS 31


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