Obsidian PA6+CF (Alternativa ONYX Markforged) View larger

Obsidian PA6+CF (Alternative to ONYX Markforged)

3DxTech

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140,00 €
140,00 €

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Low cost replacement for Markforged Onyx filament. Lightweight and oil/gas/lubricant resistant.

3DXtech is a technical filament manufacturer from the United States, in business since 2014. They focus their efforts on coming up with innovative polymer filaments and custom blends that satisfy highly advanced functional needs arising in the additive manufacturing market. 3DXtech has a wide range of materials including technical and advanced materials and support filaments. In their own words, 3DXtech’s products target "difficult end-use applications where functionality is king." Their specialty are filaments enriched with carbon fibers, such as the Obsidian PA CF filament.

3DXtech's Obsidian PA6 CF filament was developed to be a cheaper drop-in substitute for the Markforged Onyx filament (>30 % savings), compatible with all Markforged 3D printers and any printer that can print PA6 CF filaments. The Obsidian PA CF is made up of >80 % PA6 copolymer and <20 % premium high-modulus carbon fiber.

Part printed with the Obsidian PA CF

Image 1: Part printed with the Obsidian PA CF. Source: 3DXtech.

Nylon (PA) is a synthetic polymer from the polyamide group. It is an affordable and highly versatile material extensively used in 3D printing due to its durability, flexibility, thermoplasticity, and resistance to abrasion, shock, friction, corrosion and chemicals. Its first uses were mainly in the consumer goods industry (toothbrushes, women’s stockings), but nylon quickly found other more advanced uses, for example to make parachutes, ropes, body armor and helmet liners for the US army.

Nowadays, nylon has uses as diverse as fishing lines, guitar strings, zips, food industry products, surgical products, screws, industrial machinery, automotive and aerospace industry, and sports.

In 3D printing, it can be found in the form of powder (SLS and MJF), pellets, and filament (FDM). The main kinds of nylon used in 3D printing are the PA12 variety (automotive, machinery, industry) and the PA6 variety. PA6, also known as polycaprolactam, is the most extensively used polyamide thanks to its great performance/cost ratio. It is distinguished by its toughness, short- and long-term heat resistance, resistance to aliphatic hydrocarbons (oil/gas/lubricants), great surface and processability quality, and yield strength.

The addition of carbon fibers

Filaments with technical applications are often reinforced with carbon fibers or glass fibers to better equip the filament for the task it is designed to perform. Adding carbon fiber (CF) makes the filament more stiff and more dimensionally stable, which translates into a reduced risk of warping. Pieces printed with CF-enriched filaments are a great substitute for metal parts due to reduced weight. Those properties make plastic reinforced with CF perfect for the automotive industry (high tensile strength and modulus, high temperature tolerance and low thermal expansion) and the aerospace industry (weight reduced up to 50 % with preserved functionality).

Size comparison of a carbon fiber and a human hair

Image 2: Size comparison of a carbon fiber and a human hair. Source: 3DXtech.

3DXtech’s Obsidian PA6 CF

This PA6 CF filament is reinforced with 5-10 μm wide carbon fibers, aligned following the axis of the filament, which gives the material great structural properties, mechanical and thermal properties, bringing out the best in the nylon and the carbon fibers. The Obsidian PA6 CF is characterized by low warping, low shrinking, low CTE (coefficient of thermal expansion), and great material flow, which makes it an easy filament to 3D print.

This material is ideal both for prototyping and for the production of end-use parts. It is also possible to produce complex parts with a 3D printer with a dual extruder, using Obsidian PA6 CF as the build material in one extruder and a support filament in the other. The recommended support filament for this material is the water soluble AquaTek X1 UMS support filament.

The Obsidian PA6 CF is ideal for 3D printing elements that must be rigid but also lightweight, which makes it the material of choice for aerospace, civil engineering, the military and motorsports.

Elongation at break (%) 11
Tensile strength (MPa) 44
Tensile modulus (MPa) 3500
Flexural strength (MPa) 75
Flexural modulus (MPa) 3800
Softening temperature (ºC) 147
Lightweight Lightweight
Fiber reinforced Fiber reinforced
Chemical resistance Chemical resistance
Hide color variations (Hide color variations)

Carbon fiber reinforced filaments wear down the nozzle significantly more than standard filaments. That is why the use of wear-resistant nozzles (of at least 0.25 mm in diameter) is highly recommended to avoid nozzle degradation and the deterioration of printing quality. The manufacturer specifically recommends hardened steel nozzles, such as the v6/Volcano/Supervolcano nozzles, the Dyze hardened steel nozzle or the Vanadium nozzle.

Adhesion problems may occur when printing with nylon. Even though this PA filament’s adhesion is improved due to the addition of carbon fibres, the manufacturer recommends to prep the printing bed properly by using an adhesive stick, such as the Magigoo PA stick.

Nylon is a highly hygroscopic material. PA filament should still be stored properly to prevent the filament from getting humid. It should be kept in a vacuum sealed packaging or in a drying cabinet, such as the Fiber Three drying case, available in the version F3 Safe Light or F3 Safe Long Run. For even better results, the Slice Engineering filament drying capsule is recommended. If the Obsidian PA6 CF is exposed to elevated levels of humidity for prolonged periods of time, it should be dried for 4 hours at 90 ºC.

3DXtech recommends using a heated chamber to print with this filament.

Compatible with all Markforged printers, and any 3D printer that can print PA CF filament. No change in print settings is required since Obsidian PA6 CF was designed to be a drop-in replacement for Markforged Onyx.

General information
Manufacturer 3DXtech
Material PA6-CF
Format 1000 g spool
Density (ASTM D792) 1.2 g/cm3
Filament diameter 1.75 mm
Diameter tolerance ±0.05 mm
Filament length ±346,5 m (Ø 1.75 mm - 1 kg)
Color Black
RAL/Pantone  -
Print properties
Printing temperature 265 - 285 °C
Base / bed temperature 90 - 110 ºC
Chamber temperature Recommended
Layer fan -
Print speed -
Recommended support material AquaTek™ X1 UMS
Mechanical properties
Izod impact resistance -
Charpy impact resistance -
Elongation at break (ASTM D638) 11 %
Tensile Strength (ASTM D638) XY 44 MPa
Traction module (ASTM D638) XY 3500 MPa
Flexural Strength (ASTM D790) XY 75 MPa
Flexural modulus (ASTM D790) XY 3800 MPa
Surface resistance (ASTM D257) >109 Ohm
Thermal properties
Softening temperature (ASTM D648) 147 ºC
Melting temperature -
Specific properties
Surface resistance >109 Ohm/sq
Additional Information
HS Code 3916.9
Spool diameter (outer) -
Spool diameter (inner hole) -
Spool width -


* The typical values detailed in this table should be considered as a reference. Actual values may vary depending on the 3D printer model used, part design and printing conditions. We advise to confirm the final results and properties with our own tests. For more information you should consult the product data sheet.

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