Nylon vs PETG Filament: Which One Should You Buy?

A strong bracket that warps off the bed, a gear that softens near a warm motor, a spool that hisses and strings after a damp week in storage: those are the moments when the material choice matters more than the model. This guide answers nylon vs petg filament directly. Nylon suits demanding functional parts that need strength, toughness and heat resistance, while PETG suits simpler everyday prints where easy printing matters more than peak strength. The sections below compare what each material asks of your printer, your storage and your finishing, and then look at the nylon gear the listings describe.

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Nylon vs PETG filament: the short answer

Pick one of the nylon listings here when the part must carry load, flex, slide or resist heat, using the property each listing states for that spool. Pick PETG for a display piece, a simple bracket, a housing or a prototype where a simpler print matters more than the load-bearing and heat figures the nylon listings state. Nylon asks for dry storage, and the carbon fiber grades here ask for a hardened nozzle; only the ELEGOO listing states enclosed-printer compatibility. That gap in stated requirements is the real trade in this comparison.

What nylon brings to a print

Nylon is a family of engineering plastics, and the listings in this guide show how wide that family runs. The Polymaker listing describes Fiberon PA612-CF15, a long-chain PA612 nylon reinforced with 15 wt% carbon fiber, aimed at rigid functional parts, tooling, jigs, fixtures and engineering prototypes. Its typical values include 91.9 MPa dry X-Y tensile strength and 83.1 MPa after the specified annealing and moisture-conditioning process, with heat deflection temperature reaching 175°C at 0.45 MPa after annealing at 100°C for 16 hours.

The ELEGOO listing describes a carbon fiber PAHT nylon for enclosed FDM printers, with ambient temperatures of up to 194 °C stated and carbon fiber credited for strength, stiffness, abrasion resistance and dimensional accuracy. Its stated uses include gears, bearings and structural parts that need durability and precise fit. The SUNLU listing describes a Nylon 6+66 PA filament with a heat deflection temperature of 121°C, tensile and bending strength stated as exceeding regular PLA/ABS, and drop resistance credited for high-stress parts such as gears and bearings. The Creality listing describes a nylon filament that is durable and flexible, with chemical resistance including oils and solvents, low friction, and a surface that is easy to paint, sandable and dyeable.

What PETG brings to a print

PETG is the simpler everyday-print side of this comparison. It is presented here for housings, brackets, display pieces and prototypes, while the nylon listings here are the ones that state the heat, load-bearing and sliding figures below. This guide states no PETG figure, so no PETG property is claimed as a listing fact here.

The trade is at the top end. The nylon listings here are the ones that state load-bearing gear and bearing uses, through the ELEGOO and SUNLU listings, and the chemical and sliding character the Creality listing credits to nylon. They also state the heat figures quoted in the heat question below, while this guide states no PETG heat figure.

The nylon gear in this guide

Ranked by stated specs, strongest stated case at the top, the nylon spools compare as follows.

Polymaker Fiberon PA612-CF15 Carbon Fiber Nylon Filament 1.75mm, Black, 0.5kg. The listing states lower moisture sensitivity than PA6-based nylon with stronger mechanical performance than PA12-based materials. It asks for an all-metal hotend, a 250-300°C nozzle, a 40-50°C build plate and a hardened steel or ruby nozzle with the cooling fan off, and it notes a heated chamber is not required under the stated conditions. Speeds up to 300 mm/s may be possible with a tuned profile. Storage must stay below 20% relative humidity, and the listing says to dry at 100°C for 10 hours before use if the spool has seen ambient humidity or if stringing, bubbles or rough surfaces appear.

ELEGOO Carbon Fiber PAHT 3D Printer Filament 1.75mm Black 1KG. The listing states much lower water absorption than regular PA-CF, excellent interlaminar adhesion, and suitability for enclosed 1.75 mm FDM printers. It recommends a hardened steel nozzle with a diameter of no less than 0.4 mm at a print temperature of 260-300 °C and a hotbed temperature of 100-120 °C.

SUNLU Nylon Filament 1.75mm, Nylon 6+66 PA Filament, 1KG, Black. The listing states low shrinkage, warp-free printing, a Nylon 6/66 copolymer formula, smooth extrusion and reliable dimensional accuracy. Its recommended settings are a nozzle temperature of 270-280°C, a platform temperature of 30-50°C, a speed of 100-150mm/s, a drying temperature of 90°C and a drying time of 12H. Annealing is described as heating the printed model to 90-130°C and then cooling it slowly to improve heat resistance and strength. The spool diameter is stated as 203.2mm (8inches), the spool width as 63.5mm (2.5inches) and the hub hole diameter as 55.88mm (2.20inches). Note a contradiction inside this listing: the title names Nylon 6+66 PA while a later bullet credits carbon fiber reinforcement for interlayer bonding, so treat that bullet as the listing claim rather than a stated composition. The PC spool is stated as resistant to high temperature of 110℃, and vacuum packaging with an aluminum foil bag is stated for moisture protection.

Creality Nylon 3D Printer Filament 1.75mm, 1kg, Nylon. The listing states high durability and flexibility, superior strength and heat resistance, good layer adhesion and a dimensional accuracy of ±0.02mm. It also states 12-month and 24 hours after-sales service.

Printing and storage: what changes between them

Nylon storage is the habit that decides print quality. The Polymaker listing keeps filament below 20% relative humidity during storage and printing, and the SUNLU listing uses vacuum packaging with an aluminum foil bag to guard against moisture. Dry a nylon spool before a demanding print if it has sat out, following the listing figures for that spool: Polymaker states drying at 100°C for 10 hours, SUNLU states a drying temperature of 90°C and a drying time of 12H.

Nozzle wear is the next change. Carbon fiber nylon grades ask for hardened nozzles: Polymaker states a hardened steel or ruby nozzle, ELEGOO states a hardened steel nozzle with a diameter of no less than 0.4 mm.

Printer enclosure is the last change, and here the listings differ, but the two statements are not the same requirement. ELEGOO states compatibility with enclosed FDM printers, while Polymaker states a heated chamber is not required under its stated conditions. A heated chamber and an enclosed printer are different requirements, so the Polymaker statement does not answer the enclosure question.

Common mistakes to avoid

• Printing nylon from a damp spool and blaming the model for stringing, bubbles or rough surfaces.
• Running carbon fiber nylon through a nozzle other than the hardened type its listing states.
• Choosing PETG for a part that must hold shape near heat, then watching it soften in service.
• Choosing nylon for a simple display piece and paying the drying cost, and for carbon fiber grades the hardened-nozzle cost, for strength the part never uses.
• Skipping the spool listing settings and borrowing nozzle, bed or drying figures from another spool.

Nylon vs PETG filament: the short version

1. Decide what the part must do: carry load, flex, slide or resist heat points to nylon; simple everyday use points to PETG.
2. Read the spool listing for nozzle, bed, enclosure and drying settings before starting.
3. Dry nylon spools that have sat out, following the listing figures for that spool.
4. Fit a hardened nozzle for carbon fiber nylon grades.
5. Print a small trial shape in the chosen material before committing to a long functional print.

FAQ: lasers and CNC

Do I need an enclosed printer for nylon?

It depends on the spool, and the two statements are not the same requirement. The ELEGOO listing states compatibility with enclosed FDM printers. The Polymaker listing states a heated chamber is not required under its stated conditions; that is a statement about a heated chamber, not about whether the printer is enclosed.

Why does nylon need drying before printing?

Nylon absorbs moisture from the air, and damp filament prints with stringing, bubbles or rough surfaces, as the Polymaker listing warns. That listing states storage below 20% relative humidity and drying at 100°C for 10 hours when a spool has seen ambient humidity. The SUNLU listing states a drying temperature of 90°C and a drying time of 12H.

Can I print carbon fiber nylon with a soft nozzle?

The listings do not state a soft nozzle as suitable. Polymaker states a hardened steel or ruby nozzle, and ELEGOO states a hardened steel nozzle with a diameter of no less than 0.4 mm. For carbon fiber grades, the hardened nozzle is the listed choice.

Which nylon spool here suits gears and bearings?

Both the ELEGOO and SUNLU listings name gears and bearings as stated uses. ELEGOO credits carbon fiber for abrasion resistance and dimensional accuracy, and SUNLU credits drop resistance and high-stress strength for the same kind of parts. The Creality listing adds low friction and chemical resistance, which suits sliding parts.

Does nylon suit parts that face heat?

Among the listings here, yes, with the listing figures as the guide, and the figures are different measures. Polymaker states heat deflection temperature reaching 175°C at 0.45 MPa after annealing at 100°C for 16 hours. SUNLU states a heat deflection temperature of 121°C. ELEGOO states ambient temperatures of up to 194 °C, which is an ambient temperature figure, not a heat deflection temperature, so it is not directly comparable with the other two.

Related: see our PLA vs PETG filament comparison and FDM vs resin 3D printer guide for the printer side of the choice.