Formlabs Nylon 11 CF Powder – 6 kg (Carbon Fiber Reinforced)

Formlabs Nylon 11 CF Powder is a carbon fiber-reinforced SLS material engineered exclusively for the Fuse 1+ 30W, delivering a tensile modulus of 5.3 GPa in the X axis and a heat deflection temperature of 178 °C at 1.8 MPa. Built on a PA11 base, it merges the ductility of nylon with the structural rigidity of carbon fibers — producing lightweight, dimensionally stable end-use parts that withstand repeated impact. Available in a 6 kg cartridge with a recommended 30% refresh rate.

What Carbon Fiber Does to PA11 — And Why It Matters

Nylon 11 on its own is a flexible, impact-absorbing material with high elongation. Carbon fiber changes the equation fundamentally: it anchors the polymer chains, raising stiffness by more than three times compared to base PA11. The result is Nylon 11 CF Powder — a material that achieves 5.3 GPa tensile modulus in the X axis and 4.2 GPa flexural modulus, numbers that put it firmly in composite-substitute territory.

The anisotropic nature of the material is worth understanding before designing for it. Carbon fiber particles align preferentially in the X and Y axes during sintering. Tensile modulus in X is 5.3 GPa, dropping to 2.8 GPa in Y and 1.6 GPa in Z. Plan part orientation accordingly — load-bearing features should align with the X axis for peak structural performance.

Performance Applications: Where Nylon 11 CF Earns Its Place

The combination of high stiffness, low density, and a heat deflection temperature of 178 °C at 1.8 MPa makes this powder the right choice when standard nylons cannot hold geometry under thermal or mechanical load:

• Replacement and spare alternatives to machined metal parts
• High-impact structural equipment and protective components
• Tooling, jigs, and fixtures requiring dimensional repeatability under load
• Functional composite prototypes for validation workflows
• Strong, lightweight structures in automotive and aerospace applications

Fuse 1+ 30W Exclusive: Why Compatibility Is Non-Negotiable

Nylon 11 CF Powder requires the active powder handling system found only in the Fuse 1+ 30W. Using this material in a Fuse 1 printer can permanently damage the machine. No exceptions. The Fuse 1+ 30W's nitrogen purge capability is equally important: Formlabs recommends printing in an inert gas environment — using a nitrogen generator or bottled nitrogen — to achieve consistent mechanical results. This is not optional for optimal part quality.

Biocompatibility and Chemical Resistance

Parts printed in Nylon 11 CF Powder have been evaluated per ISO 10993-1:2020 and confirmed biologically safe for long-term surface contact (intact skin, >30 days). The material passes cytotoxicity (ISO 10993-5:2009), irritation (ISO 10993-23:2021), and sensitization (ISO 10993-10:2021) requirements — a relevant certification for medical device tooling and regulated production environments. Chemical resistance is solid across 17 common solvents: weight gain remains at or below 1.3% in all tested cases, and isooctane (gasoline) registers 0.0%.

Powder Handling: The 300 µm Sieve Requirement

Before recovering printed parts from the powder cake, replace the Fuse Sift's standard 150 µm sifter mesh with the 300 µm sifter mesh supplied separately by Formlabs. Nylon 11 CF powder clumps more aggressively than standard nylon in its unsintered state, and the finer mesh will block during part recovery. For best results, fill a powder cartridge simultaneously while sifting — this keeps the used powder hopper in motion and prevents bridging.

When preparing to fill a powder cartridge, pour only the amount of fresh powder needed for the selected refresh rate into the fresh powder hopper. Large volumes of stagnant powder settle and flow poorly. If the Fuse Sift fails to dose automatically, tap Manual Dosing on the touchscreen and use a wooden rod to continuously agitate both hoppers.

The third step of the manual dosing sequence handles fresh powder. Remove the entire rectangular hopper cover for better access when stirring, then tap Dose Fresh and agitate continuously until dosing completes.

Between-Print Maintenance: Mandatory Cleaning Steps

Carbon fiber powder is conductive and more abrasive than standard nylon — accumulated material that fuses between jobs creates print failures and risks short-circuits in the printer's electronics. These cleaning steps are mandatory, not optional.

Powder collects at the top of the print enclosure, particularly on the runways between the powder troughs and the build chamber. This excess can fuse and be dragged into subsequent builds. Vacuum this area thoroughly after every print job.

Nylon 11 CF powder accumulates heavily in the troughs. The image below shows a typical buildup pattern in the trough channels after a print job. Use a vacuum with a static-dissipative compliant attachment — standard vacuums without static control are not suitable for carbon fiber powder.

Vacuum the left trough completely, using the flexible hose attachment to reach all inner walls and corners. Use the flipper motor moves via the Maintenance touchscreen menu to dislodge powder from hard-to-reach positions before vacuuming.

Repeat the same procedure on the right trough. The flexible vacuum hose must reach all corners and the area along the recoater's path. Pay particular attention to the inner edge of each trough — this is where Nylon 11 CF powder most frequently compacts and causes recoater drag.

The inner edge of the trough is the highest-risk compaction zone. The image below highlights this critical area with a red arrow — ensure the vacuum hose passes directly along this edge before closing the enclosure.

Finally, move the recoater to an accessible position and inspect it for semi-sintered deposits. If coated, clean with a lint-free microfiber cloth wetted with ethanol before starting the next job.

Tech Tip: Carbon fiber particles are electrically conductive. Never manually clean Nylon 11 CF parts in a Fuse Blast — always use the automatic cleaning cycle. Manual blasting can cause dangerous static buildup that damages both the equipment and the parts. Additionally, keep PPE — gloves and eye protection — on during all powder handling, as carbon fiber particles are an irritant for skin and mucosal membranes.