Nylon (PA) Printing Guide: Drying-First

Nylon (PA) is exceptionally tough and low-friction, prized for gears, hinges and load-bearing mechanical parts — and it is, without close competition, the most moisture-sensitive material in our knowledge base. Every nylon printing guide should really just be a drying guide with some settings attached, because a wet spool ruins the print before any slicer setting gets a chance to matter.

Baseline: Bambu's stock PA (nylon) profile

Why drying comes first, every time

Nylon absorbs atmospheric moisture faster and more thoroughly than any other common filament — spools left unsealed for even a single humid day can print visibly worse. Wet nylon shows up as loud popping/crackling at the nozzle, a rough foamy surface, weak layer bonding despite correct temperature, and dimensional inaccuracy that no amount of flow or temperature tuning will fix. Our general drying schedule (the drying guide) lists nylon's target at the long, hot end of the spectrum compared to PLA or PETG — treat any nylon spool that's been open more than a few hours with real suspicion, and dry pre-emptively rather than waiting for symptoms.

Storage discipline matters more than for any other material

• Keep it sealed with fresh desiccant between every print, not just when it's visibly been a while — nylon reabsorbs moisture within hours in humid conditions, faster than PETG or PVA.
• Print directly from a dry box if nylon is a regular material. Drying once before a long multi-hour print doesn't help if the last hour of printing happens on filament that's been reabsorbing moisture in open air the whole time.
• Treat any print quality complaint on nylon as a drying question first, even if the settings haven't changed since the last good print — ambient humidity does, and it explains far more nylon failures than a bad slicer setting does.

Chamber heat and where nylon fits

With a vitrification point at 108 °C and an active chamber target of 60 °C on enclosed machines, nylon sits in the same enclosed-machine-strongly-preferred tier as PC and ABS/ASA — see the warping guide's chamber-heat logic, which transfers directly. Nylon-carbon-fiber blends (PA-CF) run even more conservative max-volumetric-speed limits than plain PA; if printing a filled nylon, expect to slow down further than these baseline numbers suggest.

What settings actually fix once drying is confirmed

• Weak layer bonding: confirm chamber heat is active before touching cooling fan settings. See the layer separation guide.
• Under-extrusion at higher speeds: nylon's conservative max volumetric speed is a real ceiling, not overly cautious data — see the under-extrusion guide.
• Warping on open printers: nylon without an enclosure is a genuinely hard combination; see the honest limits discussed in the warping guide.