PA Filaments
Polyamide (Nylon)
PA (Polyamide, commonly called nylon) is a high-performance engineering material known for its outstanding toughness, fatigue resistance, and self-lubricating surface. Gears, hinges, living hinges, structural brackets, and wear pads are classic applications — PA keeps working under repeated stress that would crack PLA or even PETG. The challenge is its extreme hygroscopicity: nylon absorbs moisture from the air faster than almost any other filament. A wet spool will foam, delaminate and produce a rough surface regardless of how well the printer is tuned. Filament drying before every print session is non-negotiable, and printing directly from a sealed dry box is the best practice.
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What is PA used for?
- Gears, pulleys and mechanical linkages
- Living hinges and repeated-flex components
- Wear pads, bushings and sliding parts
- Structural brackets and load-bearing clips
- Functional parts that must survive repeated drops
How to print PA
PA typically prints at 250–280 °C nozzle temperature (Prusa's Prusament PA12 targets 285 °C; check the spool label for your specific brand). A heated bed at 70–90 °C is needed for adhesion — a PEI sheet with a thin layer of glue stick or a dedicated nylon adhesive spray (Magigoo PA) works well. An enclosure is recommended to maintain elevated ambient temperature and reduce warping, especially for large parts; unfilled PA grades warp significantly, though PA-CF variants are much more stable. Disable or limit the part-cooling fan. Dry the filament for at least 6–8 hours at 70–80 °C before printing, and print directly from a sealed dry box if possible.
Advantages
- Outstanding toughness and impact resistance
- Excellent fatigue resistance — survives repeated flex
- Self-lubricating surface reduces friction on gears and slides
- Good chemical resistance to oils and fuels
- High-performance CF and GF variants widely available
Limitations
- Extremely hygroscopic — must be dried before every print
- Warps significantly without an enclosure (unfilled grades)
- Requires high nozzle temperature — all-metal hotend needed
- Adhesion to print surface can be tricky
- Advanced material — not suitable for beginners
Common variants
Nylon family materials span a wide performance range:
- PA6 (Nylon 6)
- The classic engineering nylon — toughest and most hygroscopic of the common grades. Highest moisture absorption; requires the most careful drying.
- PA12 (Nylon 12)
- Lower moisture absorption than PA6, less warping, and slightly easier to print. A popular choice for production-grade parts.
- PA11
- Bio-sourced from castor oil; flexible and tough, with lower moisture uptake than PA6. Good for living hinges and flexible functional parts.
- PA-CF / PA-GF
- Carbon-fibre or glass-fibre filled: dramatically reduced warping, higher stiffness, better dimensional accuracy. Requires a hardened nozzle.