3D Printing Guide

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Select the type of fiver to used. Kevlar, Fiberglass, HSHT Glass, and Carbon Fiber all offer different structural properties.

Material Specifications

Onyx Onyx is a material that is ideal for customer-facing parts that need to look good while standing up to industrial requirements. Onyx is based on a remarkably tough nylon and carbon fiber, but also provides parts with stiffness equal to or greater than any pure thermoplastic material available for professional 3D printers. It’s easy to print and far more rigid in assemblies. Onyx can be used alone, or further reinforced with embedded continuous carbon fiber, Kevlar, or fiberglass layers - parts truly transcending the limits of conventional 3D printed plastic.Our software will recommend the best Infill Pattern.

Plastics

Carbon Fiber Carbon fiber has the highest strength to weight as well as the highest thermal conductivity. Perfect for applications requiring the greatest possible stiffness and strength.

Standard Fiber Glass Fiberglass is the most cost-effective material. It's a strong as Carbon Fiber, but 40% as stiff, and 2X the weight. Suited to everyday applications where you need strong parts.

Kevlar Kevlar is the most bendable of the fibers that are can be printed with our printers. Kevlar is a high strength material that is also able to bend or provide some flexibility without snapping.

Reinforcement Fibers

HSHT Fiber Glass High-Strength, High-Temperature Fiberglass (HSHT) is a material uniquely designed for users who need strong parts for applications in higher temperature environments, over 105°C. An example of parts that would need HSHT fiberglass are prototypes that are used in under-hood automotive applications. The exception would be in the engine component itself where the temperature reaches much higher than 140°C.

Printing Materials

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Fill Density Fill density is the true density of the part. Different fill patterns have different possible minimum and maximum densities. 37% is the default.

Infill Pattern Infill patterns are geometric shapes repeated on the inside of a part to add strength. Select Solid Fill for maximum density. Our software will recommend the best Infill Pattern, but you can choose if needed.

Roof and Floor Layers Select how many layers of solid plastic are used on the top and bottom of the part. Usually this should be left at 4. (Range: 1-10 layers. Usually this should be left at 4)

Wall Layers Select how thick the walls of the part should be. More walls will make a pure plastic part stronger, but will also reduce the area that fiber will be able to fin into. (Range: 1-4 walls)

Material Settings

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Fiber fill type The fiber fill type chooses the algorithms which control how fiber will be used to reinforce the part. Concentric is good for reinforcing the walls of a part while Isotropic makes a part relatively stiff in all directions.

Layers of Patterns The total number of layers we will fill with fiber in the part. You can divide and section the part with different layer patterns.

Reinforcement Settings

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Walls to Reinforce Select which walls will be reinforced with concentric fill.

Concentric Fiber Rings The number of rings of concentric fiber fill added per layer. The more rings, the stronger your part.

Settings for Concentric Fill

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Walls to Reinforce A comma separated list of angles (in degrees) that controls the fiber direction.

Concentric Fiber Rings The number of rings of concentric fiber fill added per layer. The more rings, the stronger your part.

Settings for Isotropic Fill

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COMPOSITESMATERIAL SPECIFICATIONS

PLASTIC MATRIX Test (ASTM) Onyx Nylon

Tensile Modulus (GPa) D638 1.4 0.94

Tensile Stress at Yield (MPa) D638 36 31

Tensile Strain at Yield (%) D638 25 27

Tensile Stress at Break (MPa) D638 30 54

Tensile Strain at Break (%) D638 58 260

Flexural Strength (MPa) D7901 81 32

Flexural Modulus (GPa) D7901 2.9 0.84

Heat Deflection Temp (oC) D648 B 145 49

Izod Impact - notched (J/m) D256-10 A 330 1000

Density (g/cm3) — 1.2 1.1

FIBER REINFORCEMENT Test (ASTM) Carbon Kevlar® Fiberglass HSHT FG

Tensile Strength (MPa) D3039 700 610 590 600

Tensile Modulus (GPa) D3039 54 27 21 21

Tensile Strain at Break (%) D3039 1.5 2.7 3.8 3.9

Flexural Strength (MPa) D7901 470 190 210 420

Flexural Modulus (GPa) D7901 51 26 22 21

Flexural Strain at Break (%) D7901 1.2 2.1 1.1 2.2

Compressive Strength (MPa) D6641 320 97 140 192

Compressive Modulus (MPa) D6641 54 28 21 21

Compressive Strain at Break (%) D6641 0.7 1.5 — —

Heat Deflection Temp (oC) D648 B 105 105 105 150

Izod Impact - notched (J/m) D256-10 A 960 2000 2600 3100

Density (g/cm3) — 1.4 1.2 1.5 1.5

Dimensions and Construction of Plastic Test Specimens:

• Tensile test specimens: ASTM D638 type IV beams

• Flexural test specimens: 3-pt. Bending, 4.5 in (L) x 0.4 in (W) x 0.12 in (H)

• Heat-deflection temperature at 0.45 MPa, 66 psi (ASTM D648-07 Method B)

All Markforged machines are equipped to print Onyx. Nylon is a specialized material that can only be printed on the Mark Two and X7. Machines that print Onyx cannot also print Nylon due to machine conditioning.

Markforged parts are primarily composed of plastic matrix. Users may add one type of fiber reinforcement in each part, enhancing its material properties.

1. Measured by a method similar to ASTM D790. Thermoplastic-only parts do not break before end of Flexural Test.

Dimensions and Construction of Fiber CompositeTest Specimens:

• Test plaques used in these data are fiber reinforced unidirectionally (0° Plies)

• Tensile test specimens: 9.8 in (L) x 0.5 in (H) x 0.048 in (W) (CF composites), 9.8 in (L) x 0.5 in (H) x 0.08 in (W) (GF and Kevlar® composites)

• Compressive test specimens: 5.5 in (L) x 0.5 in (H) x 0.085 in (W) (CF composites), 5.5 in (L) x 0.5 in (H) x 0.12 in (W) (Kevlar® and GF composites)

• Flexural test specimens: 3-pt. Bending, 4.5 in (L) x 0.4 in (W) x 0.12 in (H)

• Heat-deflection temperature at 0.45 MPa, 66 psi (ASTM D648-07 Method B)

Tensile, Compressive, Strain at Break, and Heat

Deflection Temperature data were provided by an accredited 3rd party test facility. Flexural data were prepared by Markforged, Inc. The above specifications were met or exceeded.

Markforged tests plaques are uniquely designed to maximize test performance. Fiber test plaques are fully filled with unidirectional fiber and printed without walls. Plastic test plaques are printed with full infill. To learn more about specific testing conditions or to request test parts for internal testing, contact a Markforged representative.

Part and material performance will vary by fiber layout design, part design, specific load conditions, test conditions, build conditions, and the like.

This representative data were tested, measured, or calculated using standard methods and are subject to change without notice. Markforged makes no warranties of any kind, express or implied, including, but not limited to, the warranties of merchantability, fitness for a particular use, or warranty against patent infringement; and assumes no liability in connection with the use of this information. The data listed here should not be used to establish design, quality control, or specification limits, and are not intended to substitute for your own testing to determine suitability for your particular application. Nothing in this sheet is to be construed as a license to operate under or a recommendation to infringe upon any intellectual property right.

Material Specification Composites

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Flexu

ral S

tress

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Flexural Strain

6061 T6 Aluminum

ABS

HSHTFiberglass

Carbon Fiber

FiberglassKevlar®

Nylon

Onyx

Fiber ReinforcementContinuous Filament Fabrication (CFF) is our

unique technology that adds fiber reinforcement

to printed parts. Within our thermoplastic matrix,

Markforged uses proprietary technology to lay

down continuous long-strand fiber. Users can

control the layers reinforced, amount, orientation,

and type of reinforcing fiber.

Plastic MatrixIn Fused Filament Fabrication (FFF), the printer

heats thermoplastic filament to near melting

point and extrudes it through its nozzle, building a

plastic matrix layer by layer. Markforged prints all

thermoplastics by this method.

Onyx Nylon

Fiberglass Carbon Fiber

Kevlar® HSHT Fiberglass

Printing Methods

COMPOSITESMATERIAL DESCRIPTIONS

Materials

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OnyxEngineering Grade ThermoplasticOnyx yields stiff, strong, and accurate parts.

Already 1.4 times stronger and stiffer than ABS,

Onyx can be reinforced with any continuous

fiber. Onyx sets the bar for surface finish,

chemical resistivity, and heat tolerance.

Flexural Strength 81 MPa

Flexural Stiffness 2.9 GPa

FiberglassReinforced Fiber StrengthFiberglass is our entry level continuous fiber,

providing high strength at an accessible price.

2.5 times stronger and eight times stiffer than

Onyx, Fiberglass reinforcement results in

strong, robust tools.

Flexural Strength 210 MPa

Flexural Stiffness 22 GPa

Carbon FiberAluminum Strength. Half the Weight.Carbon Fiber has the highest strength to

weight ratio of our reinforcing fibers. Six times

stronger and eighteen times stiffer than Onyx,

Carbon Fiber reinforcement is commonly used

for parts that replace machined aluminum.

Flexural Strength 470 MPa

Flexural Stiffness 51 GPa

NylonTough Flexible ThermoplasticNylon parts are flexible, impact-resistant

and can be reinforced with any Markforged

continuous fiber. The material works best in

applications that require more flexibility or low

working friction.

Flexural Strength 32 MPa

Flexural Stiffness 0.84 GPa

Kevlar®Lightweight, Durable, and StrongKevlar® possesses excellent durability, making

it optimal for parts that experience repeated

and sudden loading. As stiff as fiberglass and

much more ductile, it’s best used for end of arm

tooling.

Flexural Strength 190 MPa

Flexural Stiffness 26 GPa

HSHT FiberglassStrength at High TemperaturesHigh Strength High Temperature (HSHT)

Fiberglass exhibits Aluminum strength and high

heat tolerance. Five times as strong and seven

times as stiff as Onyx, it’s best used for parts

loaded in high operating temperatures.

Flexural Strength 420 MPa

Flexural Stiffness 21 GPa

Plastic

Plastic

Fiber

Fiber Fiber

Fiber

Material Specification Composites

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