Material Comparison

Nylon PA6 vs PA12

Two polyamide variants with very different printing personalities. Same material family, different trade-offs.

Last updated: March 2026

For a full side-by-side comparison of Nylon and 7 other materials, see our master comparison table:

When to use

PA6

PA6 is the performance nylon. Higher tensile strength (~70 MPa vs ~50 MPa for PA12), better heat resistance (HDT around 180 °C under low load), and greater stiffness make it the go-to for load-bearing parts.[1] If you are replacing an injection-molded nylon part, PA6 is the closest match because most commercial nylon products are PA6 or PA66.

The trade-off is brutal printability. PA6 absorbs moisture faster than any other common FDM filament — leave a spool out overnight and it may be ruined. It warps aggressively, shrinks more during cooling, and demands a well-tuned enclosed printer with a heated chamber. Bed adhesion is a constant fight; most PA6 users swear by garolite (G10) build surfaces or PVA glue on PEI.

Ideal for: structural brackets, gear assemblies, bearing housings, hinges under load, and any part where mechanical performance justifies the printing difficulty.

Community tip: Print PA6 from a heated drybox at 60 °C with the enclosure at 50 °C+. If you are getting bubbles in your extrusion, the filament has absorbed moisture — dry it at 80 °C for 8-12 hours before trying again. A food dehydrator is not hot enough for PA6.

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When to use

PA12

PA12 is nylon you can actually print without losing your mind. It absorbs roughly half the moisture of PA6 (1.5% vs 2.5-3% at saturation), warps less, and shrinks more predictably during cooling.[2] You still need an enclosure and a drybox, but the margin for error is much wider. Parts come out dimensionally accurate without the obsessive chamber-temperature tuning PA6 demands.

Mechanically, PA12 trades some stiffness and tensile strength for better impact resistance and flexibility. It bends further before breaking, which makes it excellent for snap-fit parts, clips, and living hinges. The lower moisture absorption also means PA12 parts are more dimensionally stable over time — PA6 parts swell as they absorb ambient moisture post-print.

Ideal for: snap-fit enclosures, flexible clips, cable management parts, phone cases, hinges, and functional parts where reliable printing matters more than maximum strength.

Community tip: Polymaker PA12 and Bambu PA6-CF are the two most commonly recommended nylons on Reddit. If this is your first nylon, start with PA12 — the learning curve is steep enough without fighting PA6's moisture issues at the same time.

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The community verdict

PA12 for hobbyists. PA6 (or PA6-CF) when you need maximum performance and have the setup to handle it. This is the near-universal consensus. PA12 gives you 80% of nylon's mechanical benefits with half the frustration. PA6 is for people who already have an enclosed, chamber-heated printer and a reliable drying workflow.

The carbon fiber variants muddy this picture a bit. PA6-CF prints more reliably than unfilled PA6 because the fibers reduce shrinkage and warping. So if you specifically want PA6-level strength, the CF version is often easier to work with than plain PA6 — just bring a hardened nozzle.

Both variants need dry storage permanently. If you are not willing to invest in a drybox setup, nylon is the wrong material family entirely. PETG or ABS will get you 80% of the way there with a fraction of the hassle.

Frequently Asked Questions

Do I need a drybox for both PA6 and PA12?

Yes. Both nylons are hygroscopic and absorb moisture from the air, which causes bubbling, stringing, and weak layer adhesion during printing. PA6 is significantly worse — it can absorb enough moisture to become unprintable in 24 hours of open-air exposure. PA12 is more forgiving but still needs dry storage. A heated drybox (like a Sunlu S2 or PrintDry) feeding filament directly to the printer is the standard setup for nylon.

Which nylon is stronger, PA6 or PA12?

PA6 is stronger in tensile strength and stiffness. It has higher crystallinity, giving it better mechanical properties under load. PA12 is tougher in terms of impact resistance and flexibility — it bends further before breaking. For structural parts under sustained load, PA6 wins. For parts that need to absorb impacts without cracking, PA12 is often the better choice.

Can I print nylon on a stock Ender 3 or Bambu A1?

Not well. Nylon requires an all-metal hotend (printing at 250-280 °C), a heated bed at 80-110 °C, an enclosure to prevent warping, and a drybox for filament storage. The Bambu X1C with its AMS can technically handle PA12 but moisture control is the real challenge. Budget printers need significant upgrades before nylon is practical.

What about PA6-CF and PA12-CF (carbon fiber)?

Carbon fiber variants of both nylons add stiffness and reduce warping during printing. PA6-CF is one of the strongest FDM materials available and is used in professional tooling. PA12-CF is easier to print while still being very rigid. Both require a hardened steel nozzle (carbon fiber destroys brass nozzles in hours). The CF variants are significantly more expensive — typically $40-60/kg vs $25-35/kg for unfilled.

Is PA12 just PA6 but easier?

Not exactly. They are different polymers with different molecular structures. PA12 has a longer carbon chain (12 carbons vs 6), which makes it less crystalline, less hygroscopic, and more dimensionally stable after printing. PA6 has better raw mechanical properties but PA12 is more predictable to work with. Think of PA12 as a different material that trades peak performance for reliability, not simply an easier version of PA6.

How bad is nylon warping compared to ABS?

PA6 warps worse than ABS. It has very high shrinkage during cooling and will peel off build plates aggressively without proper adhesion (PVA glue stick on PEI, or garolite/G10 build surface). PA12 warps less than PA6 but still more than PETG. An enclosure is not optional for either. Brims and slow first-layer speeds help, but large flat nylon prints remain challenging regardless of the variant.

References

Polymaker — PA6 Technical Data Sheet. https://polymaker.com/products/polylite-pa6-gf
Polymaker — PA12 Technical Data Sheet. https://polymaker.com/products/polylite-pa12
Simplify3D — Filament Properties Table. https://www.simplify3d.com/resources/materials-guide/nylon/