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Instructions for Use (IFU) for Colored 3D Prints

This document provides application-specific instructions for producing colored 3D printed parts using 3Dresyns® photopolymer resin systems.

This document does not replace the general IFU and applies only to workflows involving intentional resin coloration.

Scope of application

This IFU applies to:

  • colored photopolymer resin systems supplied or modified using 3Dresyns colorants

  • SLA, DLP and LCD vat photopolymerization printers

  • aesthetic, functional and application-driven color use

This IFU does not apply to:

  • powder-based or extrusion-based systems

  • coloration using third-party pigments not validated by 3Dresyns

Nature of color in photopolymer printing

Color in photopolymer printing is a functional and optical modification of the base resin system.

Final color appearance depends on:

  • pigment or dye type and concentration

  • resin formulation and version

  • printer technology and optical path

  • exposure strategy and layer thickness

  • post-processing and post-curing workflow

Color may influence curing behavior and optical penetration.

Printing considerations for colored resins

Compared to uncolored resins, colored systems may exhibit:

  • reduced light penetration

  • modified curing depth

  • increased sensitivity to undercuring

Exposure parameters often require adjustment to compensate for pigment absorption or scattering.

Exposure and curing considerations

To achieve consistent color and mechanical performance:

  • exposure time or intensity may need to be increased

  • excessive overcuring should be avoided to prevent color shift or surface defects

Calibration using test prints is recommended after any color change.

Color consistency and batch control

Color consistency depends on:

  • accurate pigment dosing

  • homogeneous mixing

  • controlled processing conditions

Users should:

  • document color formulation and dosing

  • avoid cross-contamination between colors

  • validate color consistency across batches

Interaction with additives and multifunctional systems

When colorants are combined with other functional additives:

  • interactions may affect curing kinetics

  • resolution and surface quality may change

Additives should be introduced sequentially and validated stepwise.

Post-processing considerations

Post-processing may influence final color:

  • insufficient washing may cause surface haze or color unevenness

  • post-curing conditions may induce color shift or yellowing

Controlled and repeatable post-processing is essential for reproducible color outcomes.

Optical and surface considerations

Surface finish affects perceived color:

  • rough surfaces scatter light and appear lighter or less saturated

  • smooth surfaces enhance color depth and gloss

Orientation and layer thickness influence surface appearance.

Validation and quality control

Users should validate colored prints by:

  • visual inspection under controlled lighting

  • comparison against reference samples

  • measurement of color consistency where required

Application-specific acceptance criteria should be defined by the user.

Limitations and responsibilities

Colored photopolymer systems are process-dependent.

Users are responsible for:

  • validating color appearance for their application

  • qualifying modified formulations

  • ensuring compatibility with mechanical and functional requirements

3Dresyns does not assume responsibility for color results obtained under user-defined workflows.

Relationship to other Instructions for Use

This IFU must always be used together with:

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

Governing principle

Color in photopolymer printing is a multivariable, process-driven feature. Final color appearance depends on formulation, printing parameters and post-processing conditions and must be validated by the user.