colorFabb_XT CF20 Carbon Fiber 3D Printer Filament – 1.75mm / 750g Spool


Out of stock

ColorFabb XT-CF20 is our incredible new carbon fiber and copolyester composite 3D printer filament. This is truly a must have filament for your inventory. XT-CF20 filament is often used for applications that demand stiffness and dimensional accuracy, perfect for advanced prototyping, RC cars and quadcopters.

Manufactured on 750g spools. Available from STACKER in 1.75mm and 2.85mm diameter. Approx. length on spool is 245 meters.

Out of stock


The ColorFabb XT-CF20 3D printer filament is our incredible new copolyester based carbon fiber composite filament. XT-CF20 uses Amphora 3D polymer from Eastman Chemical and is loaded with no less than 20% specially sourced carbon fibers sized for 3D printing. All STACKER filaments are shipped on 1kg spools for better value and longer life, perfect for commercial use and larger prints.

Here are the top features and benefits of XT-CF20.

Extremely high flex modulus (6.2 GPa) / twice as stiff as PLA
Moderate strain at break (8-10%), so no extreme brittle filament, but toughness
High glass temp. (Tg = 80C)
Very high melt strength
Very high melt viscosity
Good dimensional accuracy and stability
Low odor / styrene free solution
Easy processing on many platforms
Attractive matte black surface finish


A special point of attention is the abrasive nature of the carbon fibers. In general these fibers will accelerate the nozzle-wear of brass nozzles, much faster than unfilled filaments. There colorFabb recommends to use nozzle’s from Stainless steel or hardened copper alloys.


Just think of all the great applications for a variety industries, that now will have a material that performs according to expectations. Functionality, stiffness, dimensional stability, heat resistant, what more can you ask? Applications in the RC Industry / Drones / Aerospace / Automotive / Prototyping and many more can now be developed on your desktop 3D Printer.


ColorFabb XT-CF20 is produced wih AMPHORA 3D Polymer from Eastman Chemical.


amphora, eastman, 3d printing filament, colorfabb, stacker


Amphora 3D Polymers is a specially developed co-polyester just for 3D Printing. It’s toughness and high melt strength makes it the perfect material for producing fiber reinforced composites, providing the necessary viscosity for 3D printing, combined with a high toughness in the filament and end application.

In-house production
All STACKER 3D printer filaments are produced from start to finish by colorFabb, located in the Netherlands. Since no other external parties are involved in the making of our filament we can ensure consistent quality on every order.

Excellent diameter tolerance
ColorFabb uses sophisticated and highly precise laser measuring systems to check the diameter of the filament in real time during the actual production process. It’s measured over 1000 times per second and this helps guarantee that each spool of STACKER filament is produced within tolerance. We can guarantee 0.05mm +/- for our 1.75mm diameter filament, which means you can be rest assured that your printer is extruding the exact amount of material called for.

Within minutes of production our filament is sealed airtight with a double barrier foil. To go the extra mile, they also seal the cardboard shipper box. You can be sure our filament is fresh and ready for 3d printing every time you unbox a new spool.

In-house testing
Testing of our filament is done at both STACKER and colorFabb facilities, and this ensures the best quality possible. The colorFabb testlab features a wide range of popular 3d printers, including multiple STACKER 3D printers. They are continuously testing on actual 3d printers to ensure the filament is performing in real world situations. If you’re not sure how to print with our materials on your 3d printer, please contact us at or

Material science
ColorFabb was founded as a brand of Helian Polymers, a sister company of Peter Holland which have been active in the master batch and additives for the plastics processing industry. Both companies eat sleep and dream about 3D printing, and our passion drives us to create the best user experience possible.

ColorFabb has a well-equipped 3D printing studio with a number of popular 3D printers, including STACKER 3D printers. We also test all our filaments in our own 3D printing lab at STACKER, and have added our knowledge to this section as well. In order to help you get the best results, we have compiled the following basic guides. We always welcome user feedback, so please feel free to share with us any tips and tricks you come up with! Thank you.

colorFabb XT-CF20 filament
This composite filament based on the Amphora 3D polymer is reinforced with 20% specially sourced carbon fibers. This filament is perfect for parts which need high stiffness while still retaining some toughness. XT-CF20 has a beautiful matte surface finish when printed.


A special point of attention is the abrasive nature of the carbon fibers. In general these fibers will accelerate the nozzle-wear of brass nozzles, much faster than unfilled filaments. Therefore we recommend to use nozzle’s from stainless steel or hardened copper alloys. All HYBRID and STACKER hot ends only use stainless steel nozzles.

Suggested printing temperature:
240 to 260C*
Suggested print speed:
40 – 100 mm/s
Suggested heated bed temperature, use glue stick.

WOODFILL filament

Suggested printing temperature:
Suggested print speed:
40 – 100 mm/s
Suggested heated bed temperature (if you have one, not strictly necessary)

TIP! For stronger prints and better reliability you can increase flow rate with about 0-10%. This will cause the filament to keep going through the hot zone at a steady pace. Also check out our website for more information and slicer profiles regarding woodFill.


Suggested printing temperature:
Suggested print speed:
40 – 100 mm/s
Suggested heated bed temp (if you have one, not strictly necessary)

TIP! Depending on your set-up, 3d printer and slice software, you might see that bronzeFill needs a bit more flow compared to your normal PLA settings. Most plastics will show die swell when coming out of the nozzle tip, this is counteracted with specific slicer settings. Since bronzeFill doesn’t show a die swell you might need to increase flow rate a bit of 4-8%.

TIP! Sanding and polishing your parts will make the bronze particles shine. Start sanding with grit 120-180 and make sure all the printed lines vanish. You’ll notice that because bronzeFill is easy to sand down, careful you won’t lose too much detail. Then start working your way up by following with grit 240-320 and finishing off with grit 600 – or higher. Finally we used a clean soft cloth and some copper polish to really get all of the shine out of the bronze particles.

General Tips
Build platform

Our PLA/PHA compound performs well on both heated and non-heated build platforms. For those users printing on a cold build platform we advise applying masking tape to the build area. The rough surface of the tape will provide enough adhesion for the first layer to stick and print almost without any warping.

Users using heated build platforms have quite a few options these days. The usual suspects are glass and aluminum build plates. For directly printing on glass or aluminum we advise the user to apply glue-stick. A very thin layer will be sufficient to keep your print nicely in place.
Another method is dissolving wood glue in water, you the consistency of the substance can be quite thin, a bit like milk. By applying just a few drops and smearing this out before you start heating the built plate will create a very thin layer which holds the woodFill down very well. If applying this method, be careful that you don’t get your electronics wet.

Another method that works well with colorFabb woodFill is polyimide tape, or Kapton tape. This tape is available as a very narrow strip or very wide strips which allow you to cover the build plate in one go. When the tape is applied correctly it can last for months.

Bed Leveling

Take your time leveling the bed and adjusting the gap between 3D printer nozzle and build plate. A perfect first layer will is very important, especially for 3D prints with a large bottom layer. Having the nozzle set to close to the build plate will cause a pressure build up and as a result back flow in most hot ends, which can cause the filament drive gear to strip out the filament. If this happens, simply adjust the bed downward. Be sure to use a small bristle brush to clean away the stripped filament from the teeth of the drive gear.

PLA/PHA and Warping

PLA/PHA has very minimal warping tendencies, however if you are printing parts which take up the maximum area of your build space you might see some warping. If it’s important that your part is perfectly flat, than we suggest slowing down the fan that is cooling your part. This allows the material to slowly get rid of heat without warping. After a few centimeters you can turn on the cooling if the part needs it.

*3D printers have lots of different types of hot-end which makes it extremely difficult to give universal temperature advice. We feel our temperature advice holds for most 3D printers, but should be considered as a starting point for you to find the temperatures that work in you setup. Don’t be afraid to go either higher or lower than our advised temperatures if you feel your set-up needs this. Please refer back to your printer’s operating manual for safety and temperature specifics.

Spool Size – 750kg (1.65lbs)
Outer Diameter: 200mm
Thickness: 70mm
Inner Diameter: 53mm

Box Size

Tech Downloads
For technical data and MSDS sheets please follow this link:

The information below reflects shipping weight and dimensions (if applicable)

Weight 2.2 lbs