Instructions for Use (IFU) for Conductive Resin Systems

This document provides application-specific guidance for the use of conductive photopolymer resin systems and conductive additives supplied by 3Dresyns®.

Scope of application

This IFU applies to:

Conductive photopolymer resin systems supplied by 3Dresyns
Resin systems containing conductive fillers or functional additives
Printing of parts where electrical conductivity is a functional requirement

This IFU does not apply to:

Non-conductive resin systems
Third-party conductive additives
Applications requiring certified or guaranteed electrical performance without user validation

Nature of conductive photopolymer systems

Conductive photopolymer resins are multiphase, multivariable material systems. Electrical conductivity is achieved through the incorporation of conductive fillers or functional phases within a photopolymer matrix. Conductivity is not an intrinsic constant of the liquid resin and emerges from:

Filler type and loading
Dispersion quality
Curing degree
Printing orientation and anisotropy
Post-processing conditions

As a result, conductive behavior must be understood as process-dependent.

Conductivity basics (what makes a resin conductive)

Conductivity arises when conductive fillers form a percolating network (continuous interconnections) throughout the printed part.
Conductivity depends strongly on the filler distribution (2D/3D), the degree of deagglomeration, and suspension stability during printing.
Nanowires and microfibers naturally tend to coil and form webs/clusters; nano/micro powders also tend to agglomerate due to electrostatic interactions.
Heavy metallic fillers (e.g., silver density ~10.49 g/cm³) are prone to settling/decantation in resins (typical resin density ~0.95–1.05 g/cm³), so stabilization is critical.

Key principles of conductive resins and conductive additives

3Dresyns® conductive 3D resins and conductive additives may contain micron/submicron powders, nanoparticles, nanowires, and/or microfibers. To achieve stable, repeatable and high conductivity, these fillers must be fully wetted, dispersed, deagglomerated, stabilized in suspension, and homogenized. For nanowires and microfibers, this also means fully uncoiling them (without breaking them) to enable formation of a conductive percolation network.

Printing & post-processing

Follow our general Instructions for Use (IFU) and the IFU specific to your printing technology (SLA, DLP, LCD, Inkjet, etc.). Technology-specific IFU can be requested at info@3Dresyns.com after ordering.

Impact of conductive fillers on printability

The introduction of conductive components typically affects:

Resin viscosity and flow behavior
Light penetration and curing depth
Exposure sensitivity
Surface finish and resolution

Compared to non-filled resins, conductive systems often require:

Higher exposure energy
Adjusted layer thickness
Careful support and orientation strategies

Users must re-calibrate printing parameters for each conductive resin configuration.

Electrical anisotropy and orientation effects

Printed conductive parts may exhibit directional electrical properties. Conductivity may vary depending on:

Build orientation
Layer stacking direction
Filler alignment during printing
Post-curing conditions

Users must evaluate electrical performance along relevant directions for their intended application.

Exposure and calibration considerations

Because conductive fillers interact with light absorption and scattering, exposure behavior differs from standard photopolymers. After selecting a conductive resin system:

Exposure time must be re-evaluated
Curing rate behavior may differ significantly from non-conductive resins
Reference calibration files (e.g. 3DTest1, 3DTest2) should be printed again

Exposure optimization must balance:

Sufficient curing and adhesion
Dimensional accuracy
Preservation of conductive pathways

Difficulties & limitations (important practical reality)

Ready-to-use conductive resins containing metallic nanomaterials (e.g., silver, copper) may gel during transportation or storage if exposed to elevated temperatures (often >40–50 °C), reducing shelf-life.
Metallic nanomaterials can also suffer settling, foam formation, and even premature polymerization if exposed to excessive shear and/or heat during mixing or sonication.
Excessive shear can break delicate nanowires/microfibers, lowering conductivity. The goal is strong dispersion with controlled shear and temperature.

Key variables affecting conductivity (why values are “achievable”, not fixed)

Conductivity values shown in product pages are achievable conductivities. Final readings depend on:

Degree of wetting, deagglomeration, stabilization, homogenization, and percolation network formation
Chosen base resin and its viscosity/wetting behavior (affects suspension stability and filler distribution)
Processing equipment, settings, and heat/foam control during dispersion
Measurement method and instrumentation (2-probe vs 4-probe)
Optional post-processing such as annealing (temperature/time dependent)

Dispersion equipment: what to use (and how)

Overhead rotary mixers/stirrers: effective when properly sized. Use small Conn blades for small batches. Avoid excessive shear and friction heat. Cowles blades are generally less preferred due to sharper edges and higher breakage/shear.
Vortex mixers: ideal for small test tubes and low-to-moderate viscosity systems. Use gently to limit foam and heating. If foam forms, remove bubbles by gentle warming, mild sonication, or vacuum.
Magnetic stirrers: generally not recommended for high loadings or viscous systems—often insufficient to fully deagglomerate nanomaterials.
High-speed dispersers / homogenizers: powerful and effective. Use controlled speed and monitor temperature. Too high speed can cause foam, local heating, premature polymerization/gelation, and breakage of nanowires/microfibers.
Ultrasonics: ultrasonic baths and ultrasonic probe sonicators (also known as ultrasonic liquid processors) can be excellent for nano/submicron dispersion, but must be used with temperature control. Excessive power/time can generate heat and trigger premature polymerization. Mild sonication can also help defoam when used carefully.

Practical rule: aim for maximum dispersion at the lowest shear/sonication intensity that achieves full wetting and deagglomeration, while keeping the resin cool and low-foam.

Recommended workflow controls (stability during printing)

During printing, minimize the resin volume in the vat to reduce plasticization and surface stickiness caused by prolonged contact with liquid resin.
An automatic resin feeder or similar system is recommended.

Cleaning considerations

Alcohols (e.g. IPA) can be used for cleaning with caution, but they may reduce mechanical strength and cause embrittlement, as documented here: Comparison of different cleaning and post-processing methods.
Preferred cleaning medium: Cleaning Fluid Bio, which does not reduce mechanical performance.
Some conductive systems may swell or destabilize depending on kinetic variables such as light power and total energy dosage, which are printer- and process-dependent.

Post-processing and conductivity development

Post-processing plays a critical role in the final electrical performance of conductive parts. Washing, drying and post-curing conditions may influence:

Polymer crosslinking density
Filler–matrix interfaces
Long-term conductivity stability

Post-processing workflows must follow the applicable IFU and be validated for each conductive application.

Conductivity measurement: choose the right method

2-point probe multimeters typically give lower and less accurate readings due to contact resistance.
For reliable conductivity characterization, consider a 4-point probe system such as: Four Point Probe System (Ossila).
Background reading: Two-probe and four-probe methods.

Optional: annealing to improve conductivity

Annealing (e.g., heating the printed part to ~80–140 °C for ~30 minutes) can improve conductivity in many systems by enhancing contacts within the percolation network. The optimum annealing temperature/time depends on the specific conductive material and resin matrix.

Recommended 3Dresyns additives for conductive systems

The following additives are commonly used to improve dispersion and suspension stability:

3D-ADD Disper-All3 WS: high-polarity dispersant to wet and disperse many nanomaterials while minimizing conductivity loss.
3D-ADD ASC1 (HHP) Anti-sedimentation additive: polar anti-settling additive for stabilizing nano/micron powders, nanowires and fibers in suspension. It provides excellent flow with a higher yield value at low shear for improved stability. Dosage depends on the resin viscosity and filler loading.

Troubleshooting & optimization

If measured conductivity is below the achievable values indicated on the product page, optimize the dispersion / stabilization / homogenization workflow.
Foam reduces conductivity because trapped air acts as an insulator. Reduce mixing intensity, degas under vacuum, and/or use gentle sonication to remove bubbles.
Conductive additive dosage may need adjustment:
- Too low (below percolation threshold) → poor conductivity.
- Too high → clusters/clumps and “sea-island” structures; conductivity can plateau or even decrease.
If clumps form, reduce loading and/or improve wetting/dispersant strategy. Always ensure full deagglomeration and stable suspension before printing.
Avoid cross-contamination of conductive systems (tools, blades, containers) which can reduce repeatability and conductivity.

Stability and ageing considerations

Electrical conductivity may evolve over time due to:

Further polymer relaxation or ageing
Environmental exposure (humidity, temperature)
Mechanical stress

Users are responsible for evaluating long-term stability under their specific use conditions.

Limitations and responsibilities

Conductive resin systems are application-dependent materials. Users are responsible for:

Validating electrical performance for their specific geometry and orientation
Qualifying printed parts for functional use
Ensuring compliance with applicable regulatory or safety requirements

3Dresyns does not guarantee electrical performance independent of process conditions and does not assume responsibility for application-specific validation.

Relationship to other Instructions for Use

This IFU must always be used together with:

Instructions for Use (IFU) & Printing Parameters for DLP & LCD printers
IFU for Additives & Resin Modification
Any printer-specific IFU where applicable

In case of discrepancy, the most application-specific IFU prevails.

Governing principle

Conductive photopolymer resins are multivariable, process-dependent systems. Electrical properties are typical responses obtained under qualified workflows and are not intrinsic constants of the liquid resin.