In an industrial environment, color is rarely chosen for aesthetic reasons alone.
A red tool, a blue jig, or a green part can instantly communicate information: which machine the tool belongs to, which vehicle model it is intended for, where it should be used, or which operation needs to be performed.
This use of color is part of a broader visual management approach, particularly common in production environments that apply Lean Manufacturing principles.
The idea is simple: if information can be understood at a glance, no one needs to search for it.
This is precisely where 3D printing takes on a new dimension with the arrival of Onyx GF, Markforged’s new glass fiber-reinforced nylon, available in several colors.
Color as a Production Tool
Using colors to quickly identify tools or equipment is nothing new.
For example, in the aerospace industry, for example, precision fastener manufacturer M.S. Aerospace uses interchangeable aluminum trays that are color-coded according to the dimensions of the parts they are designed to hold [1]. The goal is not to make the shop floor more visually appealing: color simply helps operators identify the right equipment more quickly.
A similar approach can be found at PalletOne, an American pallet manufacturer. As part of its Lean initiative, the company assigned each machine its own set of color-coded tools. A blue tool placed near a green machine immediately indicates that it is probably out of place. This organization improves visibility and makes tools easier to track [2].
In both cases, color becomes a form of information.
As a result, that information can deliver very tangible value: reducing errors, accelerating an operation, or simply preventing time from being wasted searching for the right tool.
5S: Making the Workplace Visual
More broadly, this approach fits directly into the 5S philosophy, a workplace organization method associated with Lean Manufacturing and visual control [3].
The five steps are often presented by their Japanese names, English translations, and French equivalents:
| Japanese | English |
|---|---|
| Seiri | Sort |
| Seiton | Set in Order |
| Seiso | Shine |
| Seiketsu | Standardize |
| Shitsuke | Sustain |
- Seiri means eliminating what is not necessary.
- Seiton means organizing what remains so that every item has a clearly defined place.
- Seiso adds cleaning and workplace inspection.
- Seiketsu turns this organization into a standard.
- Finally, Shitsuke means sustaining these practices over time.
However, the principle behind 5S goes beyond simply keeping a workshop clean. It is about creating an environment where abnormalities and errors become visible.
That is where color becomes particularly valuable.
If color makes it possible to identify a tool immediately, it can become part of the visual control system itself.
When a Few Millimeters Make All the Difference
A recent example illustrates this approach particularly well.
At Subaru of Indiana Automotive (SIA), several vehicle models are produced on the same line. Some of the jigs used for these different models can have very similar geometries, with differences of only a few millimeters.
In an environment where tools are handled and reused many times during a shift, selecting the wrong jig can lead to an error, rework, or lost time.
To address this challenge, SIA integrated color coding into its tooling so that the correct jig could be identified immediately.
The problem was that ABS-printed parts could provide the desired color, but not the durability required for repeated use on an automotive production line.
This is where Onyx GF comes into its own.
SIA uses colored Onyx GF tooling for applications ranging from positioning jigs to more robust assembly fixtures. Color differentiates the tools, while the material maintains the mechanical performance required for production use.
As a result, color is therefore no longer a finish added after manufacturing.
It becomes part of the part’s function.
Onyx GF: Where Color Meets Industrial 3D Printing
With this challenge in mind, Markforged developed Onyx GF.
Introduced in 2026, Onyx GF is a short glass fiber-reinforced nylon available in six colors: red, yellow, blue, green, gray, and white. The material is designed for industrial applications where color can support visual management, safety, or error prevention.
The benefits are particularly clear for jigs, fixtures, and production tooling.
In practical terms, imagine a company that uses several nearly identical jigs for different product variants.
Instead of having to read a reference engraved on each part, an operator can associate:
- One color with a model
- Another with an operation
- Another with a production area
- A color with a level of criticality
Geometry remains important, but identification becomes instantaneous.
Furthermore, this approach also aligns with the principle of poka-yoke, or mistake-proofing: using product or process design to reduce the possibility of an error occurring.
From Filament to Production Tool
In this context, one of the main advantages of 3D printing in this context is the ability to quickly produce tools tailored to a specific application.
Moreover, a jig does not need to be mass-produced to be cost-effective. A single part or a few units may already justify the use of additive manufacturing when traditional tooling would require more time or resources.
With Onyx GF, this flexibility now comes with visual information built directly into the part.
Potential applications include:
- Assembly jigs differentiated by model
- Fixtures identified by workstation
- Tool holders associated with a specific machine
- Replacement parts identified by function
- Tooling intended for environments where FOD management is important
- Safety components that require quick visual identification
Color can even distinguish several versions of the same part without requiring any change to its geometry.
A Color That Eliminates an Additional Step
Traditionally, when a printed part needed to be visually identified, several solutions were available: paint, labels, markings, or engraving.
These methods can work, but they add another step to the manufacturing process.
By contrast, with a colored material, the information is built directly into the part during printing.
This is particularly valuable in a production environment, where every additional step can become a source of variation or maintenance.
The approach is even more relevant when the part is handled regularly. Color embedded in the material does not depend on a label that could peel off or paint that could wear away.
What If the Part Also Needs to Be Strong?
This is where the comparison with traditional colored plastics becomes interesting.
However, color alone is not enough for an industrial application. A production jig must withstand handling, repeated contact, and the specific stresses of its environment.
Onyx GF uses a nylon matrix reinforced with short glass fibers. Published data indicates a flexural strength of 88.2 MPa and a flexural modulus of 2.4 GPa. The material can also be reinforced with Continuous Carbon Fiber for applications requiring greater structural performance.
This positions Onyx GF not simply as a new way to produce colored parts, but as a material designed for functional industrial applications.
Onyx GF or Onyx?
The comparison with standard Onyx is particularly interesting.
Standard Onyx is a nylon reinforced with chopped carbon fiber. Markforged reports a flexural strength of 71 MPa and a flexural modulus of approximately 3.0 GPa for this material [4].
| Property | Onyx | Onyx GF |
|---|---|---|
| Reinforcement | Chopped carbon fiber | Short glass fibers |
| Colors | Black | Six colors |
| Flexural strength | 71 MPa | 88.2 MPa |
| Flexural modulus | ~3.0 GPa | 2.4 GPa |
| Continuous fiber reinforcement | Yes | Yes, with Continuous Carbon Fiber |
| Typical applications | Engineering parts and tooling | Color-coded tooling, visual management, and industrial applications |
Of course, these values should be compared with caution, since testing conditions and print parameters can influence the final properties of a part.
The key is therefore not to determine which material is “better,” but to choose the one that best suits the application.
In other words, Onyx remains an excellent choice when color does not provide functional value, while Onyx GF becomes particularly valuable when visual identification is part of the requirement.
What Do You Need to Print With Onyx GF?
At launch, Onyx GF is compatible with the Markforged FX10 and FX20 printers. Because the material contains glass fibers, it also requires a Plastic Hardened Nozzle.
Onyx GF can also be combined with Continuous Carbon Fiber for applications requiring greater structural strength.
However, compatibility is expected to evolve. The material has only just entered the market, and information published by Mark3D already indicates that support for additional Markforged platforms is planned in the near future.
Therefore, it will be worth following its development over the coming months.
A New Way to Think About Tooling
Ultimately, the arrival of Onyx GF illustrates an interesting trend in industrial additive manufacturing: the value of a part is not limited to its mechanical properties.
Its color, ease of identification, role in a 5S process, or ability to prevent an error can be just as important.
For a company already 3D printing its jigs and fixtures, switching to a colored material may seem like a small change.
Operationally, however, it can transform how tools are organized and used on the production floor.
And that may be the main advantage of Onyx GF: transforming color into a true function of the part without compromising the requirements of industrial 3D printing.
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