Browse F.A.Q. Topics


Onyx Series Specifications

What is the Onyx Series?

The Onyx Series is two printers designed to make Onyx more accessible than ever. The Onyx One prints Onyx material only and the Onyx Pro prints Onyx material with continuous fiberglass.

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Can the Onyx Series printers print with continuous fiber?

The Onyx One cannot; it’s a machine solely designed to print Onyx. The Onyx Pro can print Fiberglass, but not Carbon Fiber, Kevlar, or High Strength High Temperature Fiberglass.

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Can I print Nylon on the Onyx Series printers?

No. Onyx series printers only print Onyx plastic. The Mark Two Enterprise and the Mark X both can print with Nylon.

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What are the specifications of the Onyx Series printers?

You can find the Onyx Series specification on the product page.

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Can I upgrade from the Onyx One to the Onyx Pro?

Yes, the Onyx One can be upgraded to the Onyx Pro. In addition, the Onyx Pro can be upgraded to the Mark Two Enterprise.


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What makes Markforged printers different than most 3D printers?

Markforged printers provide unique capabilities and ruggedness to support carbon fiber printing.

Continuous Carbon Fiber: the Onyx Pro, Mark Two, and Mark X printers use a new 3D printing process, Continuous Filament Fabrication™ (CFF™), in combination with traditional Fused Filament Fabrication (FFF), to produce reinforced composites with unprecedented strength (see graph below). Parts are reinforced with continuous strands of fibers embedded in a thermoplastic matrix.

Onyx: the entire Markforged printing line also supports printing in Onyx, a unique blend of chopped carbon fiber within a tough nylon plastic, providing a stronger, stiffer and more wear-resistant part than using nylon alone. With its solid black color, Onyx has a sleek, end-use look and feel, further enhanced by 50um printing support (in select models) to allow a beautiful surface finish suitable for end-use parts.

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What are the advantages of a fiber reinforced part?

Fiber-reinforced composite parts have many excellent structural qualities (“see what is a composite?”). Markforged printed parts are up to 20 times stiffer and stronger than similar parts 3D printed using ABS plastic. Their strength depends on the type, orientation, and volume fraction of the reinforcing fibers.

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How strong are Markforged parts?

Parts printed on a Markforged printer can be designed to have the flexural strength of aluminum and tensile strength of steel. They can be stronger than 6061-T6 aluminum by weight and up to 1/3 the strength of the best carbon fiber composites made today. Performance data (included on data sheets) was collected from 3-point bend testing on an Instron® universal testing machine in the preferred fiber orientation. The performance capabilities can be seen in the below graph with a comprision across the Markforged materials, as well as aluminum and printed ABS:

stress-strain graph of our materials

As does our competition, we stress that the actual performance depends on engineering design, operating conditions, and many other variables. The data from 3D printing material data sheets may be a best case scenario for materials, not whole parts. Most parts don’t reach the full potential of a material.

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Where can I obtain models to print on my Markforged printer?

Models can either be created using any CAD or 3D modeling programs that are capable of exporting a model in one of the supported formats. Alternatively, models can also be downloaded from the various sources on the internet. If you’re looking for interesting models that have been printed on Markforged printers before, check out our blog.

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Can I get a sample part?

We offer free sample parts! You can fill out information and request one here. See how strong a 3D printed part can be.

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Where are you located?

We are located in Cambridge, MA.

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Additive Manufacturing with Composites

What is Additive Manufacturing?

Additive manufacturing, commonly referred to as 3D printing, is the industrial process by which parts are synthesized by depositing material. Specific processes vary between machines, but most involve layer-by-layer extrusion on to a build plate. This is known as Fused Filament Fabrication, or FFF.

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What is a composite?

(From Wikipedia) “Composite materials are materials made from two or more constituent materials with significantly different physical or chemical properties, that when combined, produce a material with characteristics different from the individual components.”

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What’s the difference between a thermoset and a thermoplastic?

Thermoset materials (e.g. two-part epoxy) solidify during curing, which is an irreversible chemical reaction. Once cured, they cannot be melted. In contrast, thermoplastics can be re-melted indefinitely, like nylon, and are typically tougher.

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If you don’t use an epoxy (thermosets), how does Composite Filament Fabrication (CFF) work?

We developed a thermoplastic nylon blend specifically formulated for good adhesion to carbon fiber. It’s non-toxic, and doesn’t require post curing.

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What kind of reinforcing fibers can I print with?

The Mark Two and Mark X printers are capable of printing continuous carbon fiber, glass fiber (fiberglass), kevlar, and High Strength-High Temperature (HSHT) glass fiber. The Onyx Pro can print with glass fiber only, and the Onyx One cannot print with fiber.

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How do composites printed on Markforged printers compare to those built with traditional methods?

Parts printed on the Markforged printers can be designed to be stronger than 6061-T6 aluminum by weight and up to 1/3 the strength of the best carbon fiber composites made today. Performance data was collected from 3-point bend testing on an Instron® universal testing machine in the preferred fiber orientation.


Carbon Fiber CFF test on our in-house Instron.

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What are the benefits of using continuous fibers in composites?

Composites made with continuous reinforcing fibers exhibit substantial increases in strength and stiffness compared to similar materials using discontinuous (chopped) fibers.

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I usually see composite parts that are made from woven sheets. How do you print with a weave?

Markforged printers do not print with a weave, it deposits layers of unidirectional composite in an optimized orientation that can be adjusted on a layer by layer basis. In general, unidirectional composites have a higher strength-to-weight ratio in the preferred fiber orientation than composites made with woven fabrics.

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Why are woven fabrics often used in the fabrication of composites?

Woven fabrics offer greater ease-of-use in traditional composite lay-up manufacturing processes while maintaining the desired mechanical properties. Our process is nontraditional and functions better in a unidirectional or quasi-isotropic scheme.

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How is your machine different from automated fiber placement (AFP) machines?

AFP machines automate composite lay-ups of large parts on the surface of a mold. CFF™ does not require a mold, operates at high resolution, and our dual-head systems allow for the seamless integration of pure thermoplastic regions within the part. Complex shapes such as honeycomb can be printed between layers of composite and intricate details can be added to the exterior that would be too small to be printed with continuous strand composite materials.

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Can fibers be oriented in the Z-direction?

Markforged’s CFF™ build process is very similar to that of other FFF 3D printers: parts are built by fusing two-dimensional slices on top of each other. At this time, Markforged printers do not print composite filaments in the Z-direction, though our Z-Layer adhesion is stronger than most 3D printers. When designing a part for our printer, try to minimize tensile forces in the Z direction.

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What materials can I print with a Markforged printer?

At present, the Markforged printers support two high-performance polyamide thermoplastic materials: pure Tough Nylon and chopped carbon fiber nylon, dubbed Onyx. Continous fiber, supported in specific models, can include carbon, fiberglass, Kevlar and high-strength high-temperature fiberglass.

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Are the fibers in your printers chopped or continuous?

In our fiber materials (Carbon Fiber, Glass Fiber, Kevlar, and High Strength High Temperature Glass Fiber), the fibers are continuous. In Onyx, chopped carbon fiber lends the nylon base material extra stiffness and wear resistance. To understand why continuous fibers are useful, see “What are the benefits of using continuous fiber in composites?”.

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What is Onyx?

Onyx is our second plastic filament (along with Tough Nylon). Onyx is a unique blend of chopped carbon fiber within a tough nylon plastic, providing a stronger, stiffer and more wear-resistant part than using nylon alone. With its solid black color, Onyx has a sleek, end-use look and feel.

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How much do materials cost?

See the materials list

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Can I use third-party materials with Markforged printers?

The composite resin system in the CFF™  filament is optimized to work with our nylon blend.  Using a 3rd party resin will not be supported and will void the warranty on the printhead.

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Is printing with ABS supported?

No.  Nylon has superior material properties to ABS plastic, and is virtually odorless during printing.

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Capabilities and Specifications - All Printer Models

What is the print bed removal and re-insertion repeatability?

All Markforged printer provide 10um repeatability to support insertion of electronics, metal parts, etc. into your design.

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How difficult is it to remove supports?

It depends on the geometry of the part, but usually pliers can pull them off quite easily.

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Can I use any composite with Markforged printers?

No. Markforged composite materials are specially designed to be compatible with the Markforged CFF process.

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Do parts printed on a Markforged printer require curing or post-processing?

Our parts do not require curing: CFF™ and FFF technologies utilize a thermoplastic matrix that solidifies immediately after extrusion. Parts are chemically ready for use as soon as they have finished printing. However, if parts are printed with supports, users must manually remove them before using the part.

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Are Markforged printers capable of printing geometries that require support material?

Yes. Our software automatically detects areas which require support and allows users to create easy-to-remove breakaway supports.

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My part doesn’t require composite reinforcement. Can I print in just Nylon or Onyx?

Yes. All Markforged printers support traditional thermoplastic filament (FFF) printing and are specifically designed to handle the wear and abrasion of chopped fiber filaments.

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Do you need an autoclave or vacuum bag?

No. Once the thermoplastic matrix has cooled, the parts are ready for use.


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What are the power requirements of Markforged printers?

Voltage – 100-220VAC, 50/60Hz. Power – up to 150W.

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Mark Two Enterprise Printer Specifications

How can I print Onyx with my Mark Two?

All Mark Two enterprise printers can print with both Nylon and Onyx.

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Can I use Onyx and Carbon Fiber materials interchangeably?

No, but you can use them together. Onyx is a plastic filament like Nylon, and Carbon Fiber is a continuous fiber that can be used with Onyx or Nylon to reinforce printed parts further.

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What are the specifications of the Mark Two?

Please see our specifications page for details on mechanical properties and build specifications.

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What is the largest part I can make with a Mark Two?

The Mark Two’s build volume is 320mm x 132mm x 154mm (X, Y, Z).

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Mark X Printer Capabilities

How is the Mark X better than other 3D printers?
  • Strength. We own strong parts.
  • Surface finish. 50 Micron onyx approaches the resolution of SLA
  • In-process inspection. Know the critical dimensions of your parts.

Markforged launched the first and only affordable 3D desktop printer that embeds continuous fiber into printed carbon and nylon for an end-use composite part with the strength of metal. Markforged printers are easy to use and require no chemicals, post processing or waste. More information about the Markforged advantages can be found on our website (https://markforged.com/why-markforged/)

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What operating precautions should be taken while laser measurements are being conducted?

Do not put reflective objects into the printer. Do not stare at the laser. The power of the laser is less then 1mW and will not burn a user nor cause harm presuming one does not pull out the print bed, stick their head in the printer, stare directly up at the laser while it is conducting a measurement and intentionally suppress their natural blink reflex.

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How is accuracy of the inspection handled and displayed?

Prior to printing the user specifies the layers which should be measured and more specifically the area or part of the print at specific layers that should be measured. The laser measurements are presented in Eiger, an example is below. The user defines a reference for measurement which can be seen at the yellow/green line in the below picture. Tolerance in relation to the reference is provided. The user has the option for measurements to be taken and printing to resume, or to pause printing following measurements until the user confirms if the print should be continued.

a screenshot of in-process inspection

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What are some of the causes of parts being out of specification?

Prints are influenced by material and environmental conditions as well as mechanical properties of the machine. Examples of factors that influence print tolerance include the level of wear on a nozzle, possible carbon deposits in the nozzle, humidity in the material, debris picked up by handling of filaments (such as when the filament gets lodged in the nozzle) or material shrinkage.

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What is in-process inspection?

In process inspection is our new, laser enabled scanning technology. Using a laser micrometer, the Mark X can scan and present a dimensionally accurate picture of the scanned layers while printing. This gives extremely detailed x-y positioning and allows for engineers to check the exact dimensions of their part while it’s printing.

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What is the difference between the Mark X 3D printer and the Mark Two 3D printer?

The Mark X and the Mark Two are both industrial strength printers which can print plastic parts with the strength of metal, enabled by printing with composite filament fabrication (CFF) technology. These include carbon fiber, fiberglass, HSHT fiberglass and Kevlar™. The Mark X boasts additional qualities, including a print volume that is 2.6X greater, double the print area, and an in-process inspection system. Combined, the Mark X delivers the unprecedented combination of quality, dimensional accuracy and strength.

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Mark X Printer Specifications

Will the machine have auto leveling?

Leveling is not fully automatic, but the laser assisted leveling on the machine is intuitive and reliable. Instead of shims, a new utility places the laser over each of the thumb screws and tells the user exactly how to adjust the print bed.

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Are there any companies testing this printer out?

Yes. We have 5 beta units out and have done extensive internal testing with parts for end use and for customers.

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What software do I need to operate the Mark X?

Mark X software support and requirements are identical to those of the the Mark Two Enterprise version, including a fully offline software version at an extra cost. See the software section of FAQ for more information.

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How fast does the Mark X print?

Print speed is similar to that of the Mark Two, and other FFF extrusion machines.
It’s ultimately dependent upon many variables including the resolution of the internal print layers, the resolution of the surface layers, and the frequency of the in-process inspections. We have many examples of print times for different parts within the application section of our webpage (https://markforged.com/application/prototyping/), comparing the time required from CAD to completion of a printed vs. machined usable tool, jig, fixture or end-use part. The case studies highlight completion times anywhere from 5% – 50% of alternative production methods.

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Will Nylon and Onyx feed from the cabinet?


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Can the Mark X print Nylon after printing Onyx?

We do not recommend doing so at this time.

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What materials does the Mark X print?

The Mark X supports all Markforged Materials, including continuous carbon fiber. The list of available materials and material data sheets can be found on our website (https://markforged.com/materials/)

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How does removing and re-inserting the build plate compare to the Mark Two?

The same, with and added bonus: the Mark X has alignment guides built into the back of the print plate, making it really easy to put the plate back in.

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What are the dimensions of the build volume and the size and weight of the printer?

The Mark X has:

  • a build volume of 330 mm (12.99 in) by 250 mm (9.84 in) by 200 mm (7.87 in) [XYZ]
  • a footprint of 575 mm (22.6 in) by 467 mm (18.4 in) (plus requires 3” of free space behind the machine for chords and the antennae)
  • a height, with its base cabinet, of 930 mm (36.6 in)
  • a weight of 25.5kg (56.2 lbs)

Despite this large build volume, the footprint of the Mark X is relatively small, and the printer’s robust frame and included cabinet suits it well for both the office and the shop.

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Do parts printed on a Markforged printer require curing or post-processing?

Our parts do not require curing: CFF™ and FFF technologies utilize a thermoplastic matrix that solidifies immediately after extrusion. Parts are chemically ready for use as soon as they have finished printing. However, if parts are printed with supports, users must manually remove them before using the part.

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Software: CAD and Slicing

What is Eiger?

Eiger is robust slicing software to organize, reinforce and optimize parts with continuous fiber, as well as support many printer features such as pausing prints for inserts or over-prints. The software is easy to use for any engineer while allowing for a granular level of control when needed, and is available in cloud, networked or local storage options.

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Does Eiger come with the printer?

Yes. A purchase of the printer comes with unlimited Eiger accounts.

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Can I use 3rd party software with Markforged printers?

No. The Markforged printheads require special software to operate correctly. We’ve also included advanced path planning algorithms to reduce your print time, and maximize part strength for every print.

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What kind of files can be imported into the MarkForged software?

Our software can import .STL models — the current industry standard file format. All major CAD and 3D design software packages have the ability to export geometry as an STL file.

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Can the orientation of the fibers be controlled?

Yes. The software can automatically choose the orientation of fibers, or you can specify the orientation on a layer-by-layer basis. Our software was specifically designed to give users total control over fiber orientation in each layer and thus, directional strength.

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Do I need a separate model file for each material like some other multi-material printers?

Only one model is required for each part. Our software will help you place fiber in your part.

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Sales, Warranty, and Support

How do I place an order?

Orders can be placed through your local reseller or through our webpage: https://markforged.com/order-a-mark-two/

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Do you ship internationally?

Yes. We ship directly to the USA, Canada, and the European Union.  Shipping to other countries can be done through a freight forwarder. Buyer responsible for all VAT or import duties.

Bosnia and Herzegovina

Czech Republic


United Kingdom
United States



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Where can I buy Carbon Fiber, Fiberglass or Kevlar composite filaments?

You can buy any compatible filaments from us via our website or from an authorized dealer.

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What warranty is offered?

Markforged printers have a one year parts and 3 month labor warranty. Please see our sales terms and conditions (https://markforged.com/library/terms-conditions/) for further information and detail.

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How do I order maintenance parts and consumables?

Spare parts can be ordered on our webpage at https://markforged.com/product-category/spare-parts/

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