What Is CF Filament — and Do You Need It?
Carbon fibre composite filaments are standard polymers (PETG, Nylon, ABS, PLA) mixed with short carbon fibre strands — typically 10–20% by weight. The fibres dramatically increase stiffness while reducing weight compared to the base polymer alone. For drone frame arms, this translates to less flex under motor torque, better crash energy distribution, and parts that are noticeably lighter than solid PETG equivalents.
The trade-off: carbon fibre is highly abrasive. Running CF filament through a standard brass nozzle will wear it to the point of failure within a few hundred grams of material. You need a hardened steel nozzle minimum — and for high-volume printing, a ruby-tipped nozzle is worthwhile. Most quality printers (Bambu, Prusa MK4S with hardened nozzle, Creality K1C) are CF-ready with either stock or inexpensive upgrade nozzles.
Polymaker PolyMide PA-CF Best Overall
PA-CF (Nylon-12 Carbon Fibre) is the best real-world CF composite for structural drone parts. Nylon's natural impact resistance and fatigue tolerance — the properties that make it survive repeated crashes — combined with carbon fibre stiffness produce parts that outlast every other CF variant we tested. At 87 MPa tensile strength and a flexural modulus measurably higher than PETG-CF, the PA-CF arm profiles we printed survived crash tests that destroyed PETG-CF equivalents.
The challenge: PA-CF requires an enclosed printer and careful moisture management. Nylon is hygroscopic — it absorbs moisture from air within hours and produces poor print quality when wet. Dry your spool immediately before printing. Results with a properly dried spool and enclosed machine are exceptional.
Nylon CF // PA12-CF Composite
Polymaker PolyMide PA-CF
- 87 MPa tensile strength — highest in our CF composite test group
- Nylon base provides impact resistance that pure CF-PETG cannot match
- Requires enclosed printer and pre-dried spool for best results
- 260–280°C print temperature — needs hardened steel nozzle
- 500g spools — correct cost-per-gram for structural parts
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◆ Pros
- Best crash survival of any CF composite tested
- Outstanding stiffness-to-weight ratio
- Works on any CF-capable enclosed printer
― Cons
- Hygroscopic — must dry before every print
- Requires enclosure
- Higher print temp than PETG-CF
◆ AeroInfill Verdict
Buy PA-CF if structural integrity is your priority. It is the most demanding CF filament to print correctly, but the results are worth it for any part that takes crash loads.
Bambu Lab PETG-CF Easiest to Print
PETG-CF is the most accessible carbon fibre composite: no enclosure required, no moisture problems, print temperatures similar to standard PETG. Bambu's formulation is the best we have tested — consistent fibre distribution, excellent layer adhesion, and genuinely usable stiffness improvement over plain PETG. For builders without an enclosed machine or those new to CF filament, PETG-CF is the correct starting point.
PETG-CF // Carbon Fibre Composite
Bambu Lab PETG-CF
- No enclosure required — prints at 230–250°C like standard PETG
- Hardened nozzle required (included in Bambu printers, ~$8 upgrade elsewhere)
- Measurably stiffer than plain PETG — real stiffness gain for frame arms
- Not hygroscopic — no special storage or drying required
- Available in 1kg and 250g spools
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◆ Pros
- No enclosure needed — widest printer compatibility
- No moisture management required
- Best beginner CF filament available
― Cons
- Lower tensile strength than PA-CF
- Not suitable for high-impact crash loads
- Slightly more brittle than nylon-based CF
◆ AeroInfill Verdict
Buy PETG-CF if you are new to CF printing or lack an enclosed machine. The easiest CF composite to work with, with genuine stiffness benefits over plain PETG.
eSUN ABS+ CF Budget CF Pick
eSUN's ABS+ CF is the most affordable CF composite that delivers real performance gains. It requires an enclosure for reliable prints, but at under $20 per spool it dramatically reduces the cost of building a full set of CF drone arms. Stiffness is lower than PA-CF or PETG-CF but the per-part cost is substantially lower.
ABS-CF // Budget Composite
eSUN ABS+ CF
- Best price-per-gram of any CF composite on this list
- ABS base — better UV resistance than PETG-CF for outdoor parts
- Requires enclosure for reliable prints
- Hardened nozzle required — do not run in brass
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Prusament PETG CF Consistency Pick
Prusament's PETG CF is manufactured to tighter dimensional tolerances than most CF composites — the spool-to-spool consistency is exceptional, which matters when you are dialling in CF print settings once and expecting them to work reliably batch after batch. Premium price, but the consistency justifies it for builders who run production quantities of the same part.
PETG-CF // Premium Composite
Prusament PETG CF
- Tightest diameter tolerance of any CF composite tested (±0.02mm)
- Spool-to-spool consistency — set your profile once, trust it batch to batch
- No enclosure required for PETG-CF base
- Manufactured in Prague — full production transparency and QC documentation
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Nozzle & Printer Requirements
Every CF filament on this list requires a hardened steel nozzle. Brass nozzles will wear visibly within 200–300g of CF material. For Bambu Lab printers, the hardened nozzle is included. For Prusa MK4S, use the official Prusa hardened nozzle ($18). For Creality machines, any E3D-compatible hardened steel nozzle works.
For PA-CF specifically, you also need an enclosed printer. PETG-CF and ABS-CF work on open-frame machines with an enclosure modification or in a warm room.