Tag: design flexibility

Additively manufactured electronics (AME) combines additive deposition of conductive, dielectric and structural materials to create electronic functions on, within or around three-dimensional parts. It overlaps with printed electronics, but AME places greater emphasis on multilayer, three-dimensional and embedded structures.

AME does not automatically replace conventional printed circuit boards. Its strongest use cases are geometries, prototypes and integrated functions that planar PCB manufacturing handles poorly.

AME, printed electronics and conventional PCBs

Approach	Typical structure	Strength	Limitation
Conventional PCB	Planar rigid or flexible laminate with patterned copper and assembled components	Mature density, conductivity, reliability and supply chain	Limited freedom for fully three-dimensional interconnect geometry
Printed electronics	Deposited conductive or functional inks on flexible or rigid substrates	Large-area, low-temperature and flexible functionality	Often lower conductivity and feature density than copper PCB processes
Additively manufactured electronics	Multilayer or 3D combination of dielectric and conductive materials, sometimes with embedded components	Conformal, volumetric and customized electronic structures	Materials, resolution, component integration and qualification remain challenging
In-mold electronics	Printed functional layers and components integrated into a molded polymer part	Thin smart surfaces and part consolidation	Forming, molding, interconnection and lifecycle reliability

Main AME process families

Inkjet printing

Inkjet systems eject controlled droplets of conductive, dielectric or functional ink. They can pattern fine features without a physical mask and support rapid design changes. Stable jetting requires tight control of viscosity, surface tension, particle size, nozzle condition and substrate wetting.

Aerosol jet printing

Aerosol jet printing atomizes an ink and focuses the aerosol stream through a nozzle. It can deposit fine traces on planar, curved or stepped surfaces and is used for antennas, sensors, interconnects and repair. Overspray, line-edge definition, adhesion and curing must be controlled.

Direct ink writing and microdispensing

Direct ink writing extrudes pastes or viscoelastic inks through a nozzle. It supports thicker conductors, dielectric structures, sensors and embedded features. Resolution is generally coarser than inkjet or aerosol jet, but deposited cross-section and material range can be larger.

Multi-material 3D printing

Some platforms alternate dielectric and conductive deposition to build multilayer electronic structures. Components may be placed into cavities during pauses and then connected or encapsulated. This requires registration between materials, controlled interface quality and a robust component-placement strategy.

Laser-based and hybrid methods

Laser direct structuring, laser-induced forward transfer, selective sintering and hybrid print-and-plate routes can create or improve conductive paths. These are often combined with conventional plating, component assembly, machining or molding rather than used as standalone processes.

Materials used in AME

Material class	Examples	Critical properties
Conductive inks and pastes	Silver, copper, gold, carbon and conductive polymers	Conductivity, oxidation, viscosity, particle size, adhesion and cure temperature
Dielectrics	Photopolymers, epoxies, polyimides and ceramic-filled formulations	Permittivity, dielectric strength, loss, moisture uptake and thermal stability
Structural substrates	Thermoplastics, thermosets, ceramics, glass and composites	Surface energy, coefficient of thermal expansion, stiffness and processing temperature
Resistive and sensing materials	Carbon systems, metal oxides, piezoresistive inks and functional composites	Sensitivity, drift, hysteresis, selectivity and environmental stability
Encapsulants	Polymers and barrier coatings	Moisture protection, chemical resistance, adhesion and reworkability
Component interconnect materials	Conductive adhesives, solder and printed interconnects	Contact resistance, fatigue, cure compatibility and repair

Conductivity is a central limitation

Printed metallic traces often have lower electrical conductivity than bulk or plated copper because of porosity, organic binders, incomplete sintering and small cross-section. Electrical performance depends on:

• Ink composition and metal loading
• Line width, thickness and continuity
• Drying and sintering profile
• Substrate temperature capability
• Oxidation, especially for copper
• Surface roughness and wetting
• Bends, vias and material interfaces
• Environmental aging and mechanical cycling

A trace that conducts at room temperature after printing may still fail under current load, humidity, thermal cycling or flexing. Final resistance and power-handling capability should be measured in the finished geometry.

Dielectric and RF performance

For antennas, high-frequency interconnects and embedded RF structures, the dielectric material is as important as the conductor. Relevant variables include dielectric constant, loss tangent, thickness uniformity, moisture absorption and surface roughness.

• Printed dimensions must match the electromagnetic design after cure and shrinkage.
• Material properties should be measured at the operating frequency.
• Conductor roughness and porosity can increase RF loss.
• Transitions to connectors, chips or conventional boards often dominate performance.
• Protective coatings can change antenna tuning and dielectric behavior.

Component embedding

AME systems can pause printing to place resistors, capacitors, sensors, chips or packaged components into a cavity. The process then prints connections or encapsulates the component. Key questions include:

• Can the component tolerate deposition and curing temperatures?
• How is placement accuracy maintained?
• How are terminals cleaned and connected?
• Does encapsulation create thermal stress or voids?
• Can the component be inspected, reworked or replaced?
• How is heat removed during operation?
• What happens when the structural and electronic lifetimes differ?

Applications where AME creates value

Conformal antennas

Conductive traces can be printed on curved housings, airframes, vehicle surfaces or compact devices. This can reduce separate antenna parts and enable geometry matched to the product. RF tuning, grounding, shielding and environmental durability remain critical.

Sensors and smart structures

Strain, temperature, pressure, chemical or capacitive sensors can be deposited on or embedded within a component. AME can shorten wiring and place sensing closer to the physical event, but calibration drift, cross-sensitivity and repair must be evaluated.

Rapid electronic prototypes

AME can reduce the time required to create low-volume test circuits, unusual interconnects, RF coupons or integrated demonstrators. This is particularly useful when a conventional PCB shape cannot represent the final product geometry.

In-mold and structural electronics

Printed conductors, touch controls, lighting and sensors can be formed and molded into automotive or consumer surfaces. IPC-8401, released in 2024, provides guidelines for in-mold electronics covering process structures, materials and production test methods.

Biomedical and wearable devices

Flexible sensors, electrodes and customized housings are promising uses. Skin contact, washability, motion, moisture and biological compatibility require application-specific controls. Implantable electronics involve a much higher evidence burden than external wearables.

Where conventional PCB manufacturing remains stronger

• Very high interconnect density
• Fine multilayer vias and controlled impedance
• High-current copper distribution
• Established component assembly and reflow
• High-volume low-cost production
• Mature reliability standards and test infrastructure
• Repairability and replaceable board architecture
• Broad global supplier availability

Many successful AME products will be hybrid: conventional chips and boards combined with printed antennas, sensors, interconnects or structural features.

Reliability risks

Risk	Possible mechanism	Typical evaluation
Open circuit	Cracking, poor deposition, interface separation or oxidation	Continuity monitoring and thermal/mechanical cycling
Resistance drift	Microstructural change, moisture or conductor damage	Four-point resistance and aging tests
Short circuit	Overspray, dielectric breakdown, migration or contamination	Insulation resistance and high-potential testing
Delamination	Thermal-expansion mismatch or weak surface preparation	Adhesion, peel and environmental cycling
RF performance shift	Geometry change, moisture, coating or conductor loss	S-parameter and antenna-pattern measurement
Component-joint failure	Cure stress, vibration, thermal fatigue or poor contact	Cross-section, electrical testing and life cycling
Encapsulation failure	Void, cracking or moisture ingress	Microscopy, leak, humidity and thermal-shock testing

Qualification and standards

AME standards are less mature than conventional PCB standards. IPC’s standards program lists IPC-6911, “Acceptability of Additively Manufactured Electronics,” as an approved standards-development project. Printed-electronics standards already address flexible and rigid substrates, materials and terminology, while IPC-8401 covers in-mold electronics.

1. Define application class, environment and electrical function.
2. Specify conductor, dielectric, substrate and component materials.
3. Validate geometry, registration, layer thickness and curing.
4. Measure final electrical and RF properties.
5. Test adhesion and interfaces after environmental exposure.
6. Verify embedded-component placement and interconnects.
7. Define inspection methods for hidden layers and features.
8. Run thermal, humidity, vibration and mechanical life tests.
9. Control software, inks, substrates and process changes.
10. Retain a digital data package linking design to tested hardware.

Production economics

AME can avoid masks, tooling, separate wiring and assembly, but it can also introduce expensive inks, slow deposition, curing, component placement and inspection. The strongest economic cases usually involve:

• Low-volume or frequently changing designs
• Conformal or volumetric geometry
• Part consolidation with measurable weight or assembly value
• High-value sensing or RF functionality
• Short prototype or development cycles
• Hybrid manufacturing where AME replaces only the difficult portion

Compare total cost—including inks, curing, failed deposition, component placement, test and yield—with a conventional PCB, flexible circuit, molded interconnect device or wired assembly.

Application-selection checklist

• The electronic function benefits from a 3D or conformal shape.
• Required conductivity and current are within printed-material capability.
• The substrate tolerates deposition and cure.
• Component placement and thermal management are feasible.
• Hidden conductors and interfaces can be inspected or process-controlled.
• Environmental reliability can be demonstrated.
• Repair and end-of-life strategy are acceptable.
• The total system beats conventional or hybrid alternatives.

Conclusion

Additively manufactured electronics expands electronic design beyond planar boards by enabling conformal conductors, embedded sensors and volumetric structures. The technology is strongest when 3D integration creates real product value. Conventional PCBs remain superior for many dense, high-volume and high-reliability circuits, making hybrid architectures the most practical path for many applications.

Related Addithive resources: Industrial AM Software Guide · Scaling AM Production · Nano Dimension AM Profile

References and further reading

• IPC — Standards-development status, including IPC-6911 for AME
• IPC — IPC-8401 Guidelines for In-Mold Electronics
• IPC — Printed-electronics standards and revision table