What is PETG-CF filament?

PETG-CF is PETG with chopped carbon fiber mixed in. The fibers make it stiffer and more dimensionally stable than plain PETG, give it a matte, low-line finish, and cut warping and stringing — while keeping PETG's heat, water, and chemical resistance. It's the tougher, more weather-tolerant middle tier of carbon-fiber filament: less brittle than PLA-CF, less demanding than nylon PA-CF.

Do I need a special nozzle for PETG-CF?

Yes — a hardened-steel or ruby nozzle is mandatory. Carbon fiber is abrasive and grinds a brass nozzle's bore wider with every spool until print quality drifts. A hardened nozzle costs a few dollars and lasts. Swap it before your first PETG-CF print; don't run CF on brass and expect it to survive.

Is PETG-CF stronger than regular PETG?

Stiffer and more dimensionally stable, not automatically stronger. The fibers raise rigidity and reduce warping, but they interrupt layer bonding, so a CF part can be more brittle in some directions than plain PETG. Makers publish big flexural-modulus gains — that's stiffness, not impact toughness. Buy PETG-CF for rigidity, stability, and the matte look, not as a blanket strength upgrade.

PETG-CF or PLA-CF — which should I buy?

Both are stiff and matte, but PETG-CF is tougher, less brittle, and far more heat-, water-, and UV-resistant. PLA-CF is easier to print and cheaper, and it's the right call for visible parts that stay cool and dry. Step up to PETG-CF when the part lives outside, gets warm, or takes real stress. See our carbon-fiber guide for the full tier breakdown.

Does PETG-CF need to be dried?

Yes, and more than plain PETG. PETG is hygroscopic and the carbon fiber makes a damp spool print worse — stringing, popping, and a foggy, rough surface. If you hear crackling or see bubbles in the extrusion, dry it around 60–65°C for several hours before printing, and store it sealed with desiccant between uses.

Best PETG-CF Filament in 2026: Tougher Carbon-Fiber Picks

Updated 2026-06-19 · by Jay

PETG-CF gives you three things at once: the stiffness and matte carbon look of a composite, and the toughness, heat, and chemical resistance of PETG underneath. That combination is its whole reason to exist — it's less brittle than PLA-CF and far more weather-tolerant, without the drying-box, enclosure hassle of nylon PA-CF. If you want a carbon-fiber part that can live outdoors, get warm, and take a knock, this is the tier.

One thing before you add a spool to a cart: carbon fiber is abrasive and will destroy a standard brass nozzle. You need a hardened-steel (or ruby) nozzle to run any filament below. It's a few dollars and it's not optional — skip it and you'll be replacing a worn-out nozzle within a few spools. Hardened-steel nozzles on Amazon.

And one honest caveat up front: PETG-CF is stiffer and more dimensionally stable, not automatically stronger. The short fibers raise rigidity and cut warping, but they interrupt layer bonding, so a CF part can be more brittle in some directions than plain PETG. Buy it for stiffness, stability, and the look.

Heads up: this is a research-based buyer's guide, not a hands-on lab test — we haven't printed these spools side by side. Maker-stated specs (fiber content, diameter tolerance, modulus) are labeled as claims below, not independent measurements. Some links are affiliate links; if you buy through them FilaScope earns a small commission at no extra cost to you. Details on the affiliate disclosure page.

The short answer

For the most plug-and-play PETG-CF on a modern printer, Bambu Lab PETG-CF is the tuned reference. For best value, ELEGOO and Overture both print clean and stock widely. eSUN is the stiffest-claimed of the group; Polymaker's Fiberon PETG-rCF is the pick if you want a named fiber percentage and recycled content. Every one needs a hardened nozzle and a dry spool — that's the through-line. The live block carries the current cheapest in-stock listings, re-checked daily.

At a glance

Pick	Spool sizes	Difficulty	Dry first?	Price tier	On Amazon?
Bambu Lab PETG-CF	1kg	Moderate	Yes	Mid–Premium	Yes
ELEGOO PETG-CF	0.5kg / 1kg	Moderate	Yes	Budget	Yes
Overture PETG-CF	1kg	Moderate	Yes	Budget–Mid	Yes
eSUN PETG-CF	1kg	Moderate	Yes	Mid	Yes
Polymaker Fiberon PETG-rCF08	0.5kg	Moderate	Yes	Mid–Premium	Yes
Proto-pasta Carbon Fiber PETG	0.5kg / 1kg	Moderate	Yes	Premium	No (direct)

PETG-CF spools are often sold in 0.5kg as well as 1kg, and CF filament weighs out fewer meters per kilo than plain PETG — check the spool size on the live listing before you compare prices.

Bambu Lab PETG-CF — the tuned reference

If you run a Bambu printer with the AMS, this is the easy answer. Bambu ships PETG-CF with a slicer profile already dialed in, so you get the matte finish and the stiffness boost without hunting for settings. Bambu positions it as an all-rounder among its basic filaments — stiffer than plain PETG, with strength and toughness aimed at load-bearing parts like drone frames and racing models (maker claim). It's the most "load and print" PETG-CF here, which is why it's the reference point even for owners of other machines. Dry it if it's been open a while, hardened nozzle first. Bambu Lab PETG-CF on Amazon

ELEGOO PETG-CF — the value all-rounder

ELEGOO is the default budget CF brand, and its Carbon Fiber PETG carries that reputation: cheap for a composite, widely stocked, and easy to dial in on a stock printer. ELEGOO states a tight ±0.02mm diameter tolerance across its CF lines (maker claim) and lists it in black and gray, 0.5kg and 1kg. Its own guidance — hardened nozzle 0.4mm or larger, roughly 240–270°C — is sensible PETG-CF territory. The right first spool if you want to find out whether the material suits you without overspending. ELEGOO PETG-CF on Amazon

Overture PETG-CF — the forgiving value pick

Overture earned its name on easy-printing plain PETG, and its PETG-CF leans on the same reputation for clean winding and forgiving behavior. Overture states the same ±0.02mm tolerance as its standard PETG (maker claim) and is explicit that a hardened nozzle is required — and that a 0.6mm or larger bore helps the abrasive blend feed cleanly. It comes in matte charcoal/black, the look most people buy CF for. A low-fuss value alternative to ELEGOO if one's better priced on the day. Overture PETG-CF on Amazon

eSUN PETG-CF — the stiffness-claimed pick

eSUN's ePETG-CF is the one to reach for when rigidity is the priority. eSUN claims a flexural modulus around 2500 MPa — roughly a 203% increase over plain PETG — and a ~190% jump in flexural strength (maker claims; these are stiffness and bending numbers, not impact toughness). It also reportedly warps, strings, and sticks to the nozzle less than plain PETG, and comes in a wider matte palette (dark grey, dark green, dark blue, antique brass) beyond black. eSUN's spec sheet calls for a hardened nozzle and drying around 65°C for at least 8 hours — take that seriously, because the stiffness claims assume a dry spool. eSUN PETG-CF on Amazon

Polymaker Fiberon PETG-rCF08 — the named-fiber, recycled pick

Polymaker's Fiberon line is its high-performance composite family, and the PETG-rCF08 is a PETG reinforced with a stated 8% recycled carbon fiber (maker claim). Two things set it apart: a named, honest fiber percentage rather than a vague "carbon reinforced," and recycled fiber if sustainability factors into the buy. Polymaker aims it at drone parts and automotive products — stiff, dimensionally stable, heat-tolerant. It's commonly sold in 0.5kg spools, so check the size when you compare its price to a 1kg budget roll. Same rules: hardened nozzle, dry before printing. Polymaker Fiberon PETG-rCF on Amazon

Proto-pasta Carbon Fiber PETG — the boutique pick (not on Amazon)

Proto-pasta's Carbon Fiber PETG is well-regarded among enthusiasts — the maker positions it between their CF PLA and HTPLA, adding just enough fiber to stiffen PETG without making it feel brittle, and claims it prints roughly 20% stronger and 90% stiffer than plain PETG (maker claims). The catch: it's not sold on Amazon as of this writing — you buy it direct from Proto-pasta or through specialists like MatterHackers and 3DJake. No affiliate link here, then. Worth knowing if you want a small-batch US-made option and don't mind ordering direct.

What to know before you buy

PETG-CF has a few hard requirements and a couple of honest caveats. None are deal-breakers, but ignoring them wastes money and spools:

Hardened-steel or ruby nozzle — non-negotiable. Carbon fiber grinds a brass bore wider with every spool until quality drifts. Swap it before your first PETG-CF print. Hardened-steel nozzles on Amazon
Stiffer and more stable, not automatically stronger. Big flexural-modulus claims are stiffness, not impact toughness. The fibers interrupt layer bonding, so a CF part can be more brittle in some directions than plain PETG — design for rigidity, not for surviving a drop.
PETG-CF vs PLA-CF — pick by environment. PETG-CF is the tougher, less brittle, more heat-/water-/UV-resistant tier; PLA-CF is easier and cheaper but softens in a hot car. Our best carbon-fiber filament guide lays out the full PLA-CF / PETG-CF / PA-CF ladder.
Dry it. PETG is hygroscopic, and a wet CF spool strings, pops, prints foggy, and undercuts the stiffness you paid for. Dry around 60–65°C for several hours; our filament drying guide has the full method and the storage guide covers keeping it dry.
Print hot, with PETG manners. Run it hotter (roughly 240–270°C by brand), tune retraction for stringing, and give the bed the same Goldilocks treatment plain PETG wants. New to the base material? Our best PETG filament guide covers the habits that carry straight over.

Where PETG-CF fits

PETG-CF earns its price on flat, rigid parts that also have to survive the real world — outdoor brackets, drone frames, jigs, mounts, and functional parts that get warm or wet. It's overkill for figurines; if you don't need the heat and chemical resistance, PLA-CF is cheaper and easier. If you need more than PETG-CF can give — engineering-grade strength and heat — that's the nylon PA-CF tier in our carbon-fiber guide. Not sure a composite is the right call at all? Our best filaments for functional parts guide weighs PETG-CF against plain PETG, ABS, ASA, and nylon.

The block below is generated live from the PETG-CF hub: real, in-stock listings sorted by what's well-priced right now, re-checked daily, with dead listings dropped automatically. A "best PETG-CF" pick is only useful if you can actually buy it at the price shown — which is why the real numbers live in the block, not in this prose.