Nozzle & SpoolWhich printer to buy, what it'll really cost, and what to avoid.

Nylon (PA6 / PA12)

Published · Researched 2026-09-21

Gears. Bearings. Pulleys. Living hinges that don't snap, jigs that don't crack, drone parts that survive the crash. When PETG and ASA aren't strong or wear-resistant enough, nylon is the material makers reach for — and it charges a workflow tax that surprises everyone the first time. This pass finally found actual Facebook owner threads on nylon, added real pricing dated 2026-09-21, and put a hard number on what moisture does to a finished part.

What it is: nylon is polyamide — tough, abrasion-resistant, chemically resistant, and self-lubricating. That last property is why it's the gear material: teeth sliding on teeth without grease is the job description. The market splits three ways. Plain nylon (eSUN ePA, Xtellar 645 — the old Taulman line, rebranded; Overture Easy Nylon, a PA6/6.6 copolymer) for when you want nylon's toughness without fiber cost. Filled nylon — carbon or glass fiber grades like MatterHackers NylonX, Polymaker's Fiberon PA6-CF20 (the old PolyMide PA6-CF formula under a new name), the PA612-CF15 middle ground, Bambu PAHT-CF — which print stiffer with less warp. And high-temp grades like Prusament's bio-based PA11-CF. Note that the filled carbon grades overlap with the composites category; this review is about the nylon base itself and what it demands of you.

What's genuinely good: the wear story is unmatched in common filaments. Nylon's combination of toughness and self-lubrication is why gears, bushings, and sliding parts are the canonical wins, and the community verdict is consistent that nothing cheaper substitutes. The genuinely useful finding in the research — now confirmed from three independent directions — is the PA12-over-PA6 preference, and it's evidence-based, not tribal. Bambu's wet-vs-dry data shows PAHT-CF (PA12-based) losing only 12–18% of its properties when damp, versus 40–45% for standard PA-CF — the most-cited number in the category. CNC Kitchen's independent conditioning test found PA6 samples reaching about 3% moisture versus 0.7% for PA12 after humid exposure, a ~4× difference that shows up directly in mechanical behavior. And a 2026 trade guide tabulated the family plainly: PA6 — highest moisture absorption (~3%), most warp-prone, most rigid, cheapest, hardest to print; PA11 — bio-based from castor oil, low-moderate moisture (~1–1.5%), excellent impact, most expensive; PA12 — lowest moisture (~0.5–1.5%), easiest to print, excellent dimensional stability, mid-priced. For FDM specifically: PA6 is strongest but fussiest; PA12 is the forgiving default; PA11 is the premium impact and chemical-resistance pick (Prusament PA11-CF lives here). Three sources, same conclusion — buy PA12-based if you can.

Polymaker's own Fiberon comparison table reads like a confession from the manufacturer: PA6-CF20 is the strength king of the lineup (215 °C HDT, 8636 MPa XY modulus) but also the thirstiest and most warp-prone; PA12-CF10 is the mildest (131 °C HDT, lowest stiffness); PA612-CF15 sits in the middle (175 °C HDT, 5137 MPa modulus) and is the "easier PA12-ish" bet for enclosed printers. If you want maximum numbers and accept the workflow, PA6-CF20 is real. If you want the part to behave in service, PA12-based is.

Prusament's PA11 Natural, launched around August 2026, is the interesting new entry: bio-based, "noticeably less hygroscopic than other polyamides" per Prusa, and gaining attention for low-friction gear work — with annealing (110 °C for 6–8 hours) lifting its heat deflection from under 60 °C to 122.5 °C. Annealing is the quiet extra step across the category: Polymaker wants 100 °C for 16 hours to reach full mechanical and thermal properties on PA6-CF20, and printed-but-unannealed properties are significantly lower.

What's actually wrong: the tax, and you pay all of it. Nylon is extremely hygroscopic — a dryer and dry box are mandatory, not recommended. Wet nylon pops, strings, and foams at the nozzle; the standard practice is printing straight from the dryer. PA6 absorbs the most; PA12 and PA11 are markedly less thirsty but still need drying (80 °C for 8–12 hours for PAHT-CF, print and store under 20% RH). The bluntest version of that warning from a Prusa forum thread: PA6/6.6-copolymer filaments absorb moisture fast enough that even a fresh-out-of-the-box spool can clog the extruder. Don't assume a sealed spool is a dry spool — dry every nylon spool before first use, regardless of packaging.

This pass put the hardest number in the whole project on the moisture problem: a Qidi print-lab writeup (September 2026) citing CNC Kitchen conditioning data shows PA6-CF dropping to 56% of its dry tensile strength after moisture conditioning, with nylon reaching saturation in as little as 18 hours of ambient exposure. That's the part, not the spool — the piece you installed. CNC Kitchen's governing insight deserves repeating because most owners overlook it: filament must be perfectly dry to print, but the finished part then gradually reabsorbs moisture from the air and changes properties. Choose the base polymer for the part's life in service, not just for the print — PA6 parts drift more than PA12. And the fix ladder has a top end: yes, you can overdry — a Fiberon PA612-CF15 owner got called out by commenters for drying 10 days at 100–104 °C, which the thread deemed excessive. Drying discipline is real; fanaticism isn't the same thing.

Warping is the other tax, and the new Facebook threads finally gave us owner-grade fixes instead of datasheet platitudes. A Kingroon unfilled-nylon thread (Snapmaker U1 / Bambu P1S, small ~3 cm parts warping with no chamber heater): the best combo found was a P1S with smooth PEI + glue stick — textured PEI lifted worse — but even a 15 mm brim curled at the edges. Commenters' working fixes: dry the spool to 15% RH or less before printing, preheat the bed 30–40 minutes at 100 °C, use Elmer's purple glue stick on the stock plate, drop the bed temp to ~65 °C with the Bambu PA-CF profile, add a brim — and accept that it only reduces warping, not eliminates it. One P2S owner runs a Wham Bam plate plus a 65 °C chamber heater plus wide brims and nylon still occasionally warps. The most useful single line in the thread: part geometry is the dominant variable — as infill goes up, it becomes impossible to keep the part on the bed. Design the part for nylon, don't just tune the printer for it. And brand matters more than marketing admits: one owner reports Sunlu's EasyPA warping even on a heated-chamber H2S, while Vision Miner Nanopolymer adhesive on a textured bed held without a brim. Your mileage will vary by spool.

Bed plates deserve their own paragraph because nylon exposes the difference between marketing and practice. An owner's Darkmoon CFX/Satin Duo build-plate thread asked whether anyone gets consistent adhesive-free nylon prints; the consensus answer was no. Darkmoon CFX is some owners' go-to with Vision Miner nano polymer adhesive applied once, then isopropyl alcohol between prints — it lasts many prints and takes seconds to apply with a foam brush. Two failure reports worth preserving: a Darkmoon G10 plate that was great until it was washed, then never reliable again without glue despite the owner's help, and a BIQU Glacier PRO that bubbled through four plates in about two months, ending in a switch to a KDEAVI Soft Touch plate (no glue for PA12 or PA6, a few hundred hours on two machines per the owner). The pragmatic consensus: these are expensive filaments — adhesive is cheap insurance, and no plate truly prints engineering grades glue-free.

PA612-CF15 deserves a caution of its own. An owner with poor top surfaces after a 10-day 100 °C dry got the classic fix ladder (temp tower, flow recalibration — 275 °C nozzle and 0.94 flow worked for one commenter, who also considers 75 mm/s max volumetric speed too fast for it). But the thread's real warning: a longtime owner stopped using PA612-CF15 because the recent batch was bad — with email confirmation claimed from the vendor — after 30+ kg of trouble-free prints. And desertcart reviews split the same way: one "go-to filament, no warping" owner making airsoft and RC parts on a Qidi Plus 4, versus one with a notch in the filament that killed a 20-hour print mid-run and cardboard spools whose inconsistent diameter racked in the AMS — his verdict amounted to half the price of Bambu CF filaments, roll the dice at your own risk. The value-tier CF-nylon is real; so is the variance. Note the 500 g spool format, which makes the per-kilo math less forgiving than the sticker price suggests.

It also wants an enclosure for warping — Bambu states PAHT-CF is "unsuitable for open-frame printers" outright. One flag to report honestly: Polymaker's Fiberon PA6-CF20 page claims "no heated chamber or enclosure needed" via Warp-Free tech, which contradicts conventional nylon wisdom. Report both; treat the claim as best-case and use the enclosure anyway. All filled grades need hardened steel nozzles — CF destroys brass within a few hundred grams, and the Prusa forum confirms the only required upgrade on an already all-metal E3D v6 hotend is the nozzle itself (Nozzle X or ruby/sapphire as alternatives). Nozzle temps of 260–300 °C rule out basic hotends. Prusa recommends active filtration for PA11-CF on odor and ultrafine particles, one more line item on the setup list.

The social pulse: no longer zero, but still thin — and that's now an observed fact rather than an assumption. The September 2026 Engineering Filament Lab threads are the first real nylon chatter in this research: a warping-fix thread that reads like a clinic, and a build-plate debate that reads like a support group. The tone is practical, not tribal — no brand wars, just owners trading what actually held a part to the bed. The PA12 preference has now been argued from test data in three directions rather than vibes. Treat this as the thinnest-but-real evidence tier: grounded on specs, independent testing, manufacturer docs, and a handful of genuine owner threads. Forums still speak in practical specifics; Instagram still skews to TPU. No brand tribalism, just workflow.

Value call, September 2026, per-kilo ladder (all dated 2026-09-21 unless noted): the floor moved. Filamatrix PAHT-CF hydrophobic from $74.99 and plain PAHT from $49.99 (sale pricing, crawled 3 days prior) is the cheapest entry to high-temp CF-nylon anyone has documented; Polymaker Fiberon PA6-CF20 around $40–53 (wholesale $39.99, MSRP $52.99, often sold out — check branding, old PolyMide stock still circulates); Bambu PA6-CF at $79.99 (Ultimate3DPrintingStore, 4-day crawl); Overture Easy Nylon $33.99 (was $37.99, PA6/6.6 copolymer — the cheapest plain nylon on record, though the crawl is 5 months stale); Xtellar 645 at $60; Bambu PAHT-CF at $94.99 (RFID profiles included, the ecosystem pick); NylonX at **$121–126** (0.5 kg and 3 kg SKUs only — no 1 kg, and watch the notched-spool clearance variants that aren't AMS-safe); Prusament PA11 Natural at ~$152.50/kg equivalent (800 g spools, the premium of the survey). Composite-table bands for orientation: value PA+CF ~$35–45/kg, general PA6+CF ~$55–65/kg. Plain eSUN ePA's ~$38 figure is a 2021 guide price — stale, don't rely on it. The honest plain-nylon advice: buy PA12-based if you can, budget the dryer regardless, and remember the anneal if you need the datasheet numbers.

Skip it if: you don't own a filament dryer, you print on an open frame, or the part doesn't actually see wear or load. PETG covers an embarrassing amount of what people buy nylon for — and it doesn't ask for a dryer, an enclosure, and an annealing oven.

Closing tradeoff: nylon rewards the prepared and punishes the casual. The three-source consensus on PA12 is the closest thing this category has to a free lunch; everything else is workflow — and the new owner threads prove that "workflow" means bed preheat measured in tens of minutes, adhesive as standard procedure, and parts designed around the material rather than despite it. Dryer first, spool second — and design for the part's conditioned state, not the day it came off the bed.

Nylon filament, an engineering material with a temper.
Nylon filament, an engineering material with a temper.
nylon — photo 02
nylon — photo 03
nylon extra — photo 01
nylon extra — photo 02
nylon extra — photo 03

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