Instructions for Use (IFU) for Volumetric Additive Manufacturing (VAM)

These Instructions for Use (IFU) define the workflow logic, process boundaries and user responsibilities for volumetric additive manufacturing (VAM) using 3Dresyns® material systems designed for rapid volumetric curing strategies, fast part formation approaches and advanced R&D development routes.

This document applies to 3Dresyns® resin systems intended for volumetric light-based part formation, where the final geometry is generated through spatially distributed light exposure and volumetric curing logic rather than by conventional layer-by-layer fabrication.

These workflows are process-dependent. Final performance depends on the complete material–optical engine–exposure field–geometry–post-processing chain, including resin route, optical architecture, wavelength, irradiance distribution, volumetric dose strategy, resin kinetics, part geometry, thermal effects and post-curing workflow.

Key message: VAM materials must be implemented as process-specific volumetric systems, not as universal “plug-and-print” resins. Final printability, shape fidelity and repeatability depend on the interaction between resin kinetics, optical penetration, volumetric exposure conditions and part geometry.

1) Scope, limitations and responsibilities

Scope of application

Applies to 3Dresyns® material systems designed for volumetric additive manufacturing.
Applies to workflows where parts are formed through volumetric light exposure rather than conventional layer-wise fabrication.
Applies to rigid, high-temperature, tough, foldable, flexible, elastic, hydrogel, sacrificial, glass-like and bio-based routes depending on the selected VAM material family.

Limitations

This document provides a qualified workflow framework and process logic, but does not replace user-side validation.
Compatibility between the selected resin and the target VAM process architecture must always be confirmed by the user.
Application-specific validation, regulatory compliance and final product qualification remain the responsibility of the user or legal manufacturer.

2) Governing principle

In VAM workflows, the final part is defined by the full process system, not only by the resin identity.

selected 3Dresyns® VAM route,
optical engine architecture,
wavelength and spectral matching,
irradiance distribution and volumetric dose field,
resin absorption, scattering and photoreactivity,
geometry-dependent light path effects,
thermal response during exposure,
washing, drying and post-curing workflow,
final dimensional and mechanical validation.

For this reason, final print quality cannot be predicted from resin family alone.

3) Material family logic

The 3Dresyns® VAM platform spans a broad mechanical and functional range for volumetric light-based fabrication workflows.

High-temperature and rigid routes for hard, thermally resistant or structurally stable volumetric fabrication concepts
Ultra hard and tough routes for rigid engineering-grade VAM concepts
Tough and foldable routes for damage-tolerant or more compliant volumetric parts
Hard-flexible, flexible, elastic and super-elastic routes for compliant, soft or highly recoverable VAM parts
Hydrogel routes for swellable, ultra-elastic and hydrogel-oriented VAM concepts
Sacrificial routes for indirect processing or removable volumetric support logic
Glass-like and bio-based routes for transparent or bio-based development workflows
Resolution-enhancement and reactivity-tuning routes for formulation and process tuning

The correct route should be selected primarily according to the target part behavior after volumetric curing and the optical/process logic of the target VAM system.

4) Volumetric process requirements

Volumetric additive manufacturing should be treated as a controlled optical–chemical process. The system should be evaluated for:

wavelength compatibility,
irradiance uniformity or controlled non-uniformity,
volumetric dose strategy,
resin optical attenuation,
light scattering and internal bleed,
heat generation during exposure,
oxygen effects where relevant,
resin stability during the full build cycle.

Before implementation, the resin should be:

properly homogenised,
free of visible contamination,
used under controlled temperature where needed,
matched to the appropriate optical route and validation workflow.

5) Geometry and optical-path considerations

Part geometry has a direct effect on volumetric curing response. The following should be considered where relevant:

overall section thickness,
local thickness variation,
optical path length through the resin,
trapped or shielded regions,
mass concentration in central volumes,
surface-to-volume ratio,
post-cure accessibility.

Large optical path lengths, thick cross-sections or highly variable geometries may alter local cure response, dimensional stability and thermal behavior.

6) Controlled volumetric curing behaviour

These materials are intended for workflows requiring controlled volumetric cure formation rather than simple surface-by-surface curing.

Final result depends on:

photoreactivity of the resin,
optical penetration behaviour,
scattering and internal blur,
exposure dose distribution,
oxygen sensitivity where relevant,
temperature rise during exposure,
gelation and solidification rate,
cure shrinkage and post-cure stress.

Fast part formation is possible only when the resin route and optical conditions are matched appropriately.

7) VAM process architecture and dimensional-control complexity

Volumetric additive manufacturing is not a single process architecture. Different VAM technologies use different light-delivery and cure-selection principles, and this has direct consequences for resolution control, edge sharpness and dimensional accuracy.

Tomographic volumetric routes

In tomographic VAM approaches, the target object is reconstructed through a distributed three-dimensional dose field generated from multiple angular light projections. These routes can enable fast layer-free fabrication, but they also require careful control of dose accumulation, background exposure, fuzzy boundaries, optical attenuation and geometry-dependent reconstruction effects.

For this reason, dimensional accuracy and resolution control in tomographic VAM are often strongly dependent on the combined optimisation of:

projection strategy,
dose distribution,
resin transparency and photoreactivity,
oxygen effects where relevant,
geometry-dependent light-path behaviour,
post-processing and validation workflow.

This type of complexity is especially relevant in reconstruction-based volumetric approaches, where achieving high geometric fidelity often requires balancing print speed, volumetric dose sharpness and dimensional control across the entire build volume.

Dual-wavelength selective-intersection routes

Other VAM architectures operate through a different cure-selection logic. In dual-wavelength selective-intersection approaches, polymerization is induced selectively in the region where two light fields intersect under the required photochemical conditions. In practical terms, this can provide a more spatially restricted cure event and may support improved control of feature definition and dimensional fidelity when the resin and optical system are properly matched.

Where dual-color photoinitiator systems are used, the photochemical response depends on the specific interaction between:

the two selected wavelengths,
the photoinitiator excitation pathway,
optical overlap precision,
resin absorption and scattering,
local energy density in the intersection zone.

These architectures may allow higher spatial selectivity than broader dose-reconstruction routes, but they must still be validated as complete material–optics–geometry systems.

Xolo-type workflow note

In xolography-type dual-wavelength workflows, users should employ the xolo dual-color photoinitiator system or a functionally equivalent DCPI with comparable wavelength response, excitation behaviour and cure selectivity. The selected initiator system must be validated under the real optical conditions of the target printer and resin formulation.

Compatibility should be confirmed according to:

the two operating wavelengths,
the photoinitiator excitation pathway,
resin absorption and scattering,
local energy density in the intersection zone,
required cure selectivity and dimensional fidelity.

Practical IFU implication

For 3Dresyns® VAM materials, the expected printability, achievable resolution and dimensional accuracy must always be interpreted relative to the specific VAM process architecture. A resin route that performs adequately in one volumetric curing system may require different formulation tuning, exposure strategy or validation logic in another.

Users should therefore avoid transferring assumptions directly between tomographic, dual-wavelength, holographic or other volumetric platforms without re-validation under the real optical and geometrical conditions of the target system.

8) Compatibility with VAM process architectures

Compatibility between the selected VAM material route and the volumetric process architecture must always be validated.

Key aspects include:

wavelength compatibility,
required optical clarity or controlled attenuation,
reactivity window broadness or narrowness,
sensitivity to overcuring or internal bleed,
tolerance to dose-field non-uniformity,
thermal and dimensional stability during volumetric exposure.

Not all VAM routes will behave equally across all volumetric light engines. Compatibility depends on the selected resin family and the actual process architecture.

9) Cure and solidification control

After volumetric exposure, the part must be stabilised and post-processed under controlled conditions appropriate to the selected route.

Important variables may include:

time to primary solidification,
time before handling,
washing route and solvent compatibility,
drying completeness before final cure,
post-curing wavelength, power and time,
thermal hold or annealing where relevant,
cure shrinkage and stress redistribution.

Premature handling may distort the part. Excessive post-curing may increase shrinkage, brittleness or optical deviation depending on the system.

10) Resolution and formulation tuning

The public VAM collection includes both resolution-enhancing LB routes and photo-accelerant FT routes specifically positioned for VAM resins. These additives should be treated as controlled process-tuning tools, not as universal shortcuts.

VAM LB tuning routes

Publicly visible examples include Fine Tuner VAM LB3 Bio ULWA and Fine Tuner VAM LB4 Bio ULWA. These routes are relevant where the objective is to reduce internal bleed, tighten feature definition and improve dimensional control in volumetric workflows.

VAM FT tuning routes

Publicly visible examples include Fine Tuner VAM FT4 Bio HP, Fine Tuner VAM FT4 Bio and Fine Tuner VAM FT5 Bio WS. These are relevant where the objective is to increase effective photoreactivity, accelerate primary cure formation or better match the resin to the optical conditions of the volumetric process.

Practical tuning logic

LB routes are primarily relevant when the limiting problem is excessive optical spread, insufficient edge sharpness, poor dimensional fidelity or excessive water uptake sensitivity in the tuned system.
FT routes are primarily relevant when the limiting problem is insufficient reactivity, insufficient cure speed, weak primary solidification or poor matching to the available VAM wavelength window.

All tuning routes must be validated according to:

target feature size,
optical penetration needs,
required part sharpness,
water absorption sensitivity where relevant,
final mechanical and dimensional targets,
compatibility with the selected VAM process architecture.

11) Validation and repeatability

For repeatable VAM implementation, users should validate the workflow in stages:

Stage 1: validate resin–optics compatibility and primary cure response
Stage 2: validate first part formation and gross geometry integrity
Stage 3: validate shape fidelity and dimensional stability
Stage 4: validate washing, drying and post-curing consistency
Stage 5: validate repeatability over repeated runs

Repeatability should be confirmed using dimensional checks, visual inspection and, where needed, mechanical, optical or functional screening.

12) Failure modes and quick interpretation

Common failure modes in volumetric additive manufacturing workflows may include:

Incomplete part formation: insufficient volumetric dose, low reactivity or geometry-dependent undercuring
Excessive internal bleed: poor edge control, excessive optical penetration or insufficient attenuation control
Distorted geometry: uneven cure, thermal effects or shrinkage-induced deformation
Weak green-state integrity: insufficient primary solidification for safe handling
Poor repeatability: variable optical field, variable resin state or insufficient process control
Hydrogel swelling mismatch or sacrificial-route instability: route-specific behaviour not yet tuned to the final process window

Failure analysis should be based on the complete optical, chemical and post-processing chain, not only on the resin family.

13) Workflow selection by route

The correct VAM route depends mainly on the target final behavior after volumetric curing:

Choose high-temperature or rigid routes for thermally stable, hard or structurally resistant parts
Choose tough or foldable routes for damage-tolerant or more compliant volumetric parts
Choose flexible or elastic routes where compliance, softness or recovery behaviour are part of the final application
Choose hydrogel routes for swellable, ultra-elastic or water-responsive concepts
Choose sacrificial routes for removable or indirect processing logic
Choose glass-like routes where clarity or transparent visual behavior is part of the target concept
Choose bio-based routes where renewable-source positioning is part of the development logic
Choose FT or LB tuning routes only when the process window has already identified reactivity control or resolution control as the limiting variable.

14) Typical applications

volumetric printing R&D,
fast prototyping concepts,
complex geometries where volumetric curing is beneficial,
research demonstrators,
advanced process development projects,
engineering and biomedical exploratory workflows where relevant.

15) Related documentation

16) Governing principle

These materials are designed for volumetric additive manufacturing logic. Final performance depends on the complete material–optical engine–exposure field–geometry–post-processing workflow and must be validated by the user for the intended application.

17) Need technical support?

For technical guidance, material selection or custom developments for volumetric additive manufacturing workflows, use technical support or contact info@3dresyns.com.