Nylon PA12 & Glass-Filled Nylon 3D Printing
Nylon is where FDM stops approximating engineering plastic and becomes it. PA12 and its glass-filled variant are the materials we use when a part has to survive repeated stress, sliding contact or genuine mechanical load, and they behave differently enough from everything else here to deserve their own explanation.
Fatigue resistance is the real advantage
Most filaments fail by fatigue: flex a PLA or PETG part enough times and a crack propagates along a layer line until it breaks. Nylon tolerates repeated flexing far better, which is why living hinges, clips, latches and anything that cycles thousands of times get printed in it.
It is also exceptionally tough in impact. Nylon parts tend to deform and recover rather than shatter, which is exactly the behaviour you want in a component that occasionally gets abused.
Wear, friction and moving parts
Nylon has natural lubricity and high abrasion resistance, so it performs where surfaces slide against each other: gears, bushings, cable guides, rollers and wear pads. A PLA gear wears visibly within hours of running; a nylon one keeps its tooth profile far longer.
Glass-filled nylon adds chopped glass fibre to the polymer, which substantially increases stiffness, dimensional stability and heat resistance. The trade is a slight loss of the toughness that makes plain PA12 so forgiving, so we pick between them based on whether your part needs to flex or hold rigid.
The moisture caveat, handled properly
Nylon is hygroscopic: it absorbs moisture from the air, and wet filament prints badly, producing weak, rough parts with poor layer bonding. This is the main reason nylon prints go wrong, and it is entirely a process discipline issue.
We dry nylon before printing and keep it dry through the job, which is what makes the difference between a nylon part that performs to its datasheet and one that is worse than PETG. Finished parts can also slowly absorb ambient moisture over time, which makes them slightly tougher and marginally less stiff, worth knowing for tightly toleranced assemblies.
Nylon needs a hardened steel nozzle, particularly the glass-filled grade, which would erode brass quickly. All our machines run hardened or stainless steel as standard.
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Frequently asked questions
Can you 3D print working gears?+
Yes, nylon is the right material for it thanks to its wear resistance and natural lubricity. Tell us the load, speed and whether it runs continuously, since that affects whether PA12 or glass-filled nylon is the better pick.
PA12 or glass-filled nylon?+
PA12 when the part needs toughness and some flex, such as hinges, clips and impact-absorbing components. Glass-filled when you need stiffness, dimensional stability and higher heat resistance, such as structural brackets and mounts.
Why is nylon more expensive?+
The filament costs more, it must be dried before and during printing, and it requires a hardened steel nozzle and higher temperatures. You are paying for both material and process.
Will a nylon part change over time?+
Slightly. Nylon absorbs ambient moisture, becoming a little tougher and slightly less stiff, with a very small dimensional change. It matters only for tightly toleranced assemblies, and we will flag it if it affects your part.
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