What Materials Can the Markforged FX10 Print?

Direct answer: the Markforged FX10 prints a focused set of Markforged composites in its standard configuration, and it can print selected bound-metal filaments only after the FX10 Metal Kit and the complete debind-and-sinter workflow are added. Markforged's current FX10 page names Onyx, Onyx FR, Onyx ESD and Nylon White FS as composite base materials, with continuous Carbon Fiber and Carbon Fiber FR reinforcement. The same page names 17-4 PH stainless steel, 316L stainless steel and H13 tool steel for Metal FFF. Onyx GF has its own current FX10 material route and requires a hardened plastic nozzle.

That is not an open-filament promise. The useful buyer decision is whether the supported Markforged material, Eiger profile, installed print engine, feed hardware, print sheet, storage, post-processing cell and finished-part evidence match a recurring job. PLA, PETG, ABS, ASA, generic TPU, PEEK, PEI/ULTEM, pellets, resin and powder are not established as routine FX10 materials by the current product record. A nozzle or chamber number does not add them.

FX10 material compatibility at a glance

What the current FX10 record establishes

Markforged describes every FX10 as composite-capable, with metal capability sold as an add-on. The current product page lists a 375 × 300 × 300 mm build volume, a chamber up to 60 °C, a precision-machined aluminum bed and dual-process composite printing: normal fused-filament deposition for the base and a second nozzle for Continuous Fiber Reinforcement. Those facts explain the supported workflow; they do not prove that any thermoplastic fitting a numerical range is compatible.

The material cabinet stores four spools in sealed compartments and supports automatic changeover. This can reduce manual intervention and moisture exposure during a job. It should not be described as a recovery dryer for a spool that arrived wet. Follow the current Markforged storage and handling instructions for the exact material. The nylon drying-versus-storage guide explains why recovering material and holding dry material are different operations.

The FX10 brochure originally named Onyx and continuous Carbon Fiber and said other combinations would be added over time. The current product and material routes are broader. That lifecycle matters: use today's compatibility matrix and Eiger options, not a launch-era brochure alone. At the same time, do not promote every material listed elsewhere in the Markforged portfolio onto the FX10. A current printer-specific route, installed hardware and enabled software path should agree.

Onyx is the default composite lane, not a generic nylon preset

Onyx is Markforged's chopped-carbon-fiber-filled nylon base material. The FX10 can print it without continuous reinforcement, or Eiger can place continuous Carbon Fiber in eligible regions. The word nylon still brings moisture sensitivity, conditioning and anisotropy. Keep material sealed as instructed, record lot and time out of controlled storage, and qualify dimensions and properties after the humidity state the part will see.

Chopped fiber and continuous fiber do different jobs. Chopped fill changes the base polymer's stiffness, finish, shrink behavior and abrasion. Continuous strands create directional reinforcement where geometry and the Eiger toolpath allow them. Neither makes a printed part isotropic or identical to machined metal. Holes, thin walls, sharp transitions, load introduction, fasteners and layer direction can govern failure before a headline tensile value does.

For shops considering a more open-material platform, compare the AON3D Hylo material router, the AON3D M2+ router and the FUNMAT PRO 410 router. Their broader polymer access also transfers more process-development work to the owner. The FX10's narrower ecosystem can be an advantage when the supported Markforged workflow is the one actually needed.

Onyx FR, Onyx ESD and Nylon White FS need application-level evidence

Onyx FR is a flame-retardant base, and Carbon Fiber FR is a paired reinforcement route. Onyx ESD v2 is the current static-dissipative variant identified as FX10-compatible. These names do not certify every printed geometry, thickness, orientation, assembly or end product. Preserve the exact grade and version, review the current datasheet and certification scope, and test the finished configuration to the applicable requirement.

Markforged's current FX10 page has a naming inconsistency worth preserving. One product section says Nylon White, while the FAQ says Nylon White FS. The separate Nylon White FS route describes a food-equipment-material context. That does not make every printed part food-safe. Surface condition, porosity, cleaning, wear, contamination, colorants, process controls, geometry and the exact standard scope still matter. Confirm the supplied spool, Eiger profile and permitted application in writing.

Do not use a material-page certification as a shortcut for medical, potable-water, pressure, lifting, electrical, aircraft, vehicle-control or fire-barrier approval. Those decisions require the applicable standard, traceable inputs, controlled processing, representative finished-part testing and competent review. Printer compatibility is only the first gate.

Onyx GF creates a real hardware decision

Onyx GF is a chopped-glass-fiber-filled nylon offered in several colors for visible, identifiable tooling. Its official page names the FX10 and states that a hardened plastic nozzle is required. That makes it conditional rather than a noun-swapped Onyx recommendation. Verify that the quoted FX10 includes the required nozzle and current profile, and record the nozzle identity before qualification.

Glass-filled material changes abrasion, stiffness, surface and sometimes electrical behavior. Color can support visual management, but color alone is not a safety control or compliance result. If a tool's function depends on insulation, detectability, cleanability or color coding, define the requirement and verify the finished tool rather than treating the marketing category as proof.

Machining, sanding or drilling filled polymers can release fine polymer and fiber dust. Use local extraction, controlled cleanup and task-appropriate PPE. The nylon-composite drying guide also explains why reinforcement does not remove the base polymer's moisture behavior.

Continuous Carbon Fiber is a paired design process

Continuous Carbon Fiber is not loaded as a substitute for the base thermoplastic. The composite head deposits a supported base through one nozzle and fiber through another. Eiger decides where reinforcement is geometrically possible. Very thin walls, tiny holes, narrow ribs, tight radii and unsupported regions may not accept the fiber path a designer imagines. Inspect the actual sliced layup.

Fiber orientation should follow the load path, while shells, infill, interfaces and fasteners carry loads into and out of reinforced regions. A part can still fail by layer separation, bearing, pullout, buckling, impact, creep or an unreinforced transition. Use representative fixtures and load cases, not only a flat tensile coupon. If the consequence of failure is high, obtain engineering review and test the assembly.

Carbon Fiber FR adds a flame-retardant reinforcement option for the matching process. It does not make unrelated base materials or assemblies flame qualified. Confirm the approved base-and-fiber pairing in current Eiger, then apply the relevant test and documentation to the finished article.

The Metal Kit changes the machine and the facility workflow

The FX10 Metal Kit is a swappable print-engine path, not a software checkbox. Markforged documents dedicated metal and composite print heads, routing blocks, material tubes, print sheets and other configuration parts so the workflows remain separated. The metal head deposits bound-metal filament plus Ceramic Release material. Eiger scales the green part for expected sintering shrinkage and creates the release interface.

Printing is only the first stage. The green part must be debound in a Wash-1 and sintered in a compatible Markforged furnace. The current FX10 overview therefore treats the metal system as the printer with Metal Kit, Wash-1 and Sinter-1 or Sinter-2. A buyer who prices only the printer has not priced the operating cell, and a shop without the approved downstream equipment does not have finished-metal capability.

The current product FAQ names 17-4 PH stainless steel, 316L stainless steel and H13 tool steel. An official 2025 launch article also discussed Copper and D2 v2 among flexible metal filaments. Because the current product page is narrower, treat Copper, D2 and any other alloy as confirmation-required. Require a current Eiger option, material SKU, Wash-1 cycle, furnace compatibility, support terms and written quotation for the exact region and configuration.

17-4 PH, 316L and H13 solve different jobs

17-4 PH is the general high-strength stainless lane, 316L is the corrosion-resistant stainless lane, and H13 is the hot-work tool-steel lane. Those descriptions are starting points, not universal selection rules. Heat treatment, orientation, sinter batch, density, surface, machining allowance, corrosion environment, welds and service temperature can change the result.

Markforged publishes material data under specific test conditions. Do not convert those values into guaranteed properties for every geometry. A sintered part may need machining, heat treatment, inspection or surface finishing before use. Define the critical dimension, load, wear surface, thermal cycle, chemical exposure and acceptance method before printing. Near-net shape is not final tolerance for every feature.

For occasional metal parts, qualified external production may be more sensible than owning the wash and furnace cell. For repeat composite tooling with only rare metal demand, buy the composite workflow and outsource metal until utilization, staffing, facility and quality requirements justify expansion. The presence of an upgrade path is not itself a return-on-investment case.

Material handling, sheets and changeover are part of compatibility

Composite and metal configurations use different dedicated components. Follow Markforged's changeover and calibration instructions, preserve labeled parts, prevent cross-contamination and keep the correct print sheet with the correct process. The support portal states that the FX10 Metal configuration uses its metal print sheet, while current composite guidance pairs the FX10 composite sheet with the specified adhesion process. Do not invent a universal glue or surface recipe.

Automatic material changeover can continue a job from another compatible spool; it cannot make mixed lots equivalent. For controlled work, record material identity, lot, storage exposure, spool bay, sheet, print engine, nozzle, software version and post-processing batch. If a substitution affects color, FR/ESD status, metal lot or qualification, stop and review rather than letting automation hide the change.

The custom-part material chooser is a useful first step when the part requirement is not yet defined. Starting with a machine's longest material list often reverses the correct decision order.

Facility, electrical, chemical, fire and exposure boundaries

The FX10 is industrial equipment with hot surfaces, moving mechanisms, automatic motion and a heavy footprint. Use the current installation and operating documentation, required electrical service, clearances, floor support, environmental limits, guarding and emergency procedures. Do not bypass interlocks or reach into active equipment. Qualified trades and the authority having jurisdiction decide the final installation.

Composite printing can emit ultrafine particles and volatile compounds. A heated enclosure is not proof of safe capture. Follow each material safety data sheet and a facility-specific exposure-control plan. NIOSH's safer-3D-printing guidance prioritizes engineering controls such as source capture, ventilation and appropriate filtration. Odor is not an exposure measurement, and a filter needs selection, monitoring and replacement.

Metal FFF avoids an operator handling loose metal powder during printing, but the full cell still adds solvent debinding, hot green and brown parts, a high-temperature furnace, process gases or facility utilities, chemical storage, waste and fire planning. Use only approved Wash-1 media and furnace cycles. Follow manufacturer instructions for ventilation, flammables, spill response, PPE, loading, cooling and maintenance. GoodPrints is not the final electrical, fire, chemical, industrial-hygiene or code authority.

How to qualify one FX10 material workflow

1. Lock the exact identity: record base material, specialty version, fiber or alloy, lot, current datasheet and safety data.
2. Lock the machine configuration: record composite or metal engine, nozzle, routing parts, sheet, Eiger version and enabled profile.
3. Define the finished requirement: state dimensions, load, heat, wear, chemistry, ESD, flame or appearance acceptance before slicing.
4. Review the real toolpath: inspect fiber placement, supports, release layers, infill, orientation and features that remain unreinforced.
5. Control storage and handling: preserve sealed material, track exposure and follow the exact recovery or holding instruction.
6. Qualify downstream operations: for metal, include Wash-1, furnace batch, heat treatment, machining and inspection; for composites, include conditioning and finishing.
7. Use representative evidence: test the actual wall transitions, holes, fasteners, interfaces, load direction and service environment.
8. Write stop rules: pause for wrong material, unsupported Eiger option, damaged sheet, nozzle wear, feed resistance, abnormal odor, smoke, solvent issue, failed calibration or out-of-limit inspection.

Buyer and owner decision

• Shortlist the FX10 composite system when supported Markforged base materials, continuous Carbon Fiber, automated handling and a controlled Eiger workflow solve recurring factory tooling or end-use jobs.
• Add the Metal Kit only when 17-4 PH, 316L or H13 demand justifies the complete Wash-1, furnace, facility, staffing, maintenance and quality cell.
• Choose a broader open-material platform when third-party nylon, PC, PPS, PEEK, PEKK, PEI/ULTEM or supplier freedom is the primary requirement.
• Choose a simpler printer when the work is mostly PLA, PETG or ordinary shop prototypes and the Markforged ecosystem adds little value; the Bambu Lab P2S material router is one current lower-complexity reference point.
• Use qualified external production when metal or advanced composite work is intermittent, regulated or more dependent on inspection and process records than on machine ownership.
• Pause for written confirmation when the exact grade, Onyx GF hardware, fiber pairing, alloy, post-process equipment or application certification is essential.

For a defined part, use the custom-printing service FAQ, request a GoodPrints quote, or use the JC Print Farm route for repeat production and broader equipment access. The nylon and carbon-fiber printer guide is the lower-cost comparison when continuous-fiber placement is not actually required.

Bottom line

The FX10 is not a general-purpose open-filament printer with a metal checkbox. Its standard strength is a controlled Markforged composite workflow around Onyx-family bases and continuous Carbon Fiber. Onyx GF adds a hardened-nozzle condition. Metal capability adds a separate print engine plus Wash-1 and furnace workflow for the currently named alloys. Buy it when that whole supported chain solves a recurring requirement; choose another platform when the required material sits outside it.

Official sources checked

• Markforged FX10 product page for current composite materials, Metal Kit materials, process, build, chamber and configuration claims.
• Markforged material compatibility matrix for the current printer-specific compatibility route.
• Markforged FX10 metal and composite workflow article for print-engine changeover, green-part, Wash-1, furnace and earlier flexible-metal context.
• Markforged Onyx GF page for FX10 compatibility and the hardened-plastic-nozzle requirement.
• Official FX10 brochure for launch configuration, material cabinet, build volume, chamber and exact product imagery.
• NIOSH: Approaches to Safe 3D Printing for source-control, ventilation and exposure-reduction boundaries.