Filament Drying Temperature and Time Chart: 8 Materials and the Dryers That Fall Short

Put a damp PLA spool in the oven at 60°C to hurry it along and you can come back to a ring of welded plastic. Overture sets PLA's drying temperature at 50°C and says the filament starts to deform at 64°C. That's a 14-degree window, and a kitchen oven on its lowest setting often can't stay inside it.

Nylon goes wrong in the opposite direction. It needs 95°C by Overture's numbers, and most food dehydrators stop at 70°C. Too hot and the spool welds. Too cool and it stays wet.

Our take: buy drying heat for the hottest material you actually print, not for PLA. A food dehydrator dries PLA fine. It can't get nylon hot enough.

What temperature and how long should you dry PLA, PETG, ASA, ABS, TPU, nylon and PC filament?

On nylon, two serious sources disagree. Overture says 95°C for 7 hours. 3DXTECH, which makes engineering nylons, says 90°C for at least 4 hours and calls that a starting point. That's 5 degrees and 3 hours apart. Our advice: start at 90°C and let the test print decide, not the clock. You can always add another cycle later. You can't undo a brittle spool.

ASA, ABS, PC and the carbon-fiber nylons follow their makers' own settings. As of November 2026, Bambu Lab and Polymaker appear to list roughly 80°C (176°F) for ASA and ABS over 4 to 8 hours, 80 to 90°C for PC over 6 to 8 hours, and about 80°C for 8 hours or more for PA-CF and PAHT-CF. Brands differ, so the label on your spool overrules any chart, this one included.

The hours look alike because the figures assume a full spool, and the heat has to work through every wound layer to reach the core. A small sample spool or a half-used one dries faster. A spool left open through a humid summer takes longer.

Every figure comes in °C and °F, because plenty of dryers and ovens sold in the US only show Fahrenheit. Find your material's row, then read across to your method. A "can't reach it" cell means that method's maximum is below what the material needs. For PLA, the number to watch is the ceiling, not the drying setting.

Why can't you dry PLA hotter to make it go faster, and what temperature softens it?

PLA doesn't have to melt to ruin a spool. PLA's glass transition is roughly 55 to 60°C, near which it turns soft (an estimate as of November 2026). Winding tension presses each loop into the one beneath it, and the outer layers weld together while the strand still looks solid. Overture's rule follows from that: never set PLA above 55°C, because it softens around 64°C and the loops fuse.

No common filament has a thinner safety margin. PETG's glass transition sits at an estimated 80°C against a 65°C drying setting (as of November 2026). PC's glass transition is an estimated 145°C, and it dries at about 80°C, so it has plenty of room (as of November 2026).

Nylon and TPU break the stay-below-the-glass-transition rule. TPU is rubbery at room temperature because its glass transition is well below freezing. Nylon's glass transition is an estimated 50°C, below its own drying temperature (as of November 2026). It holds its shape anyway because it is semi-crystalline and melts at an estimated 220°C for PA6 (as of November 2026). For both, the safe ceiling is the maker's drying figure.

More heat isn't a shortcut for any material. Overture warns that too much heat or over-drying leaves filament brittle, and says a second drying cycle is safer than stretching one session. The classic mistake is running a dryer box on its max preset for every spool. Set the temperature for each material, then check whether your dryer can even reach it.

Can your AMS, dryer box or food dehydrator get hot enough to dry nylon, PA-CF or PC?

For PLA the cheap route works: Overture says a dehydrator on its lowest setting does the job. Nylon is beyond a dehydrator, and Bambu Lab's AMS units have their own temperature ceilings.

As of November 2026, Bambu Lab sells two drying AMS units, the AMS 2 Pro and the AMS HT:

• As of November 2026, the AMS 2 Pro heats to roughly 65°C. That covers PLA and PETG. At roughly 65°C (as of November 2026), it is 5°C short of TPU's 70°C and well short of ASA, ABS, PC and every nylon.
• As of November 2026, the AMS HT heats to roughly 85°C, which should cover materials dried at about 80°C but falls short of 3DXTECH's 90°C starting point for plain nylon. Nylon settings vary by brand, so if your nylon's maker lists 80 to 85°C, an AMS HT (about 85°C as of November 2026) should handle it.

According to Overture, a dryer box gives you a stable temperature and a humidity sensor so you can watch progress, and many let you print straight from the box. Many budget boxes stop at about 70°C, so read the spec sheet before you count on one for nylon.

Every "can't reach it" in the chart has a fix. As of November 2026, use a dryer rated to 95°C, an AMS HT (about 85°C) for anything that dries at 80 to 85°C, or an oven with a thermometer.

Our take: if nylon or PC is more than an occasional print for you, budget for a real high-temperature dryer. If it's occasional, the oven you already own can do the job, with care.

Is it safe to dry filament in a kitchen oven, and how do you stop the spool from warping?

The danger isn't the number on the dial. It's the overshoot. Ovens heat in bursts: the element runs at full power until the thermostat trips, and at low settings the air near the element can swing well past the target before it cuts out. Many ovens can't go low enough to begin with. Many US home ovens have a lowest setting of about 170°F (about 77°C), well over PLA's 55°C ceiling (as of November 2026).

If you use one, do it in this order:

1. Preheat the oven empty to the material's temperature.
2. Check it with a separate oven thermometer at spool height for 20 to 30 minutes, and adjust until it holds steady.
3. Load the spool on the middle rack, away from the heating element and the top grill. Use convection mode if you have it.
4. Leave the door slightly open so the moisture can escape.
5. Switch off and let the spool cool inside, then bag it straight away with desiccant.

Watch the spool as well as the filament. Some plastic spools warp at the temperatures nylon and PC need, and cardboard spools cope better. If the spool maker gives a heat limit, stay under it even when the filament could take more.

Never cook food in the oven while a spool is in it, and air out the kitchen afterward. Used that way, the oven is the cheapest route to 90°C and above if you already own one.

Should you dry carbon-fiber nylon like PA-CF and PAHT-CF differently from plain nylon?

It's still nylon. 3DXTECH says a saturated nylon spool can need 24 hours or more before it prints decently.

The setting is what changes. As of November 2026, PA6-CF and PAHT-CF makers publish their own numbers, often around 80°C for 8 hours or more. As of November 2026, that should be within reach of an AMS HT (about 85°C), while Overture's and 3DXTECH's 90 to 95°C for plain nylon appears out of reach for both AMS units.

Don't overdo it. 3DXTECH says nylon likes a little moisture and turns brittle and harder to process when it's dried too far. CF grades are stiffer to start with, so over-dried CF filament snaps in the feed path sooner.

There's one more suspect. Carbon fiber wears out brass nozzles, so a CF print that turns rough after a few spools may have a worn nozzle rather than wet filament. Use a hardened steel nozzle.

How do you know filament is wet, and when is it dry enough to print?

Wet PLA gives itself away. Overture lists crackling during printing, stringing that retraction changes don't fix, and a rough, uneven surface. Fresh PLA from a sealed bag usually doesn't need drying at all. Wet TPU is easier to spot: Overture describes extreme stringing, rough texture and weak layer bonds.

Before an important print, run three quick checks:

• Listen at the nozzle for popping or hissing.
• Extrude a slow purge and look for bubbles or wisps of steam.
• Check the first layers for a hazy, fuzzy surface.

To know when a spool is dry enough, weigh it. Put it on a kitchen scale before drying and again after each cycle. When the weight stops dropping between cycles, the water is gone. A dryer's humidity reading measures the air in the box, not the plastic, so read it as a trend.

The common mistake is blaming moisture for problems caused by a worn nozzle or the wrong print temperature. Dry once, test once, then rule moisture in or out. Getting the spool dry is only half the job. Keeping it dry is the other half.

Can you print straight from the dryer, and how long does dried filament stay dry?

According to Overture, nylon can absorb enough moisture in 30 minutes of open air in a humid room to hurt print quality badly. That matters more to your routine than any drying setting.

Overture says dried filament takes moisture back within hours without proper storage. So print nylon straight from the dryer box or vacuum-seal it the moment it comes out. Many dryer boxes have a feed port, so the filament runs from the heated box to the printer while the readout shows the humidity inside.

Storage targets sit in the last column of the drying chart. As of November 2026, maker guidance suggests TPU, nylon and PC want roughly 15 to 20% RH or less, while PLA tolerates roughly 30 to 40%.

A zip bag with silica gel is the low end. At the other end, 3DXTECH's FM1 filament maintainer holds its chamber air at a -40°C dewpoint and has a programmable humidity alarm. A home printer needs neither extreme. A vacuum bag with fresh or recharged silica gel and a humidity indicator card inside is enough. Trust the card, not the calendar.

AMS drying during a print keeps PLA and PETG dry. A spool that is already wet needs a full cycle before you print. TPU is the odd one out. As of November 2026, standard soft TPU often isn't supported in the AMS (check Bambu Lab's compatibility list), and the AMS 2 Pro's roughly 65°C is below Overture's 70°C setting anyway. Dry TPU in a separate dryer and feed it from an external spool holder.

Do ABS and nylon filaments give off harmful fumes, and does drying release them too?

3DXTECH's safety advice starts with a smoke detector wherever you print: many printed plastics are flammable, and all of them give off some vapors. It also says to ventilate while drying, not only while printing. Drying runs at roughly 80 to 95°C, against an estimated 240 to 280°C at the nozzle for these materials, so drying likely releases far less. An oven in a shared kitchen is still a reason to open a window.

Research on 3D printer emissions, including work by UL, has reported the following (as of 2026):

• ABS and ASA printing has been reported to emit styrene and other VOCs, plus ultrafine particles (as of 2026).
• Nylon printing has been reported to emit caprolactam, plus ultrafine particles (as of 2026).

Three things cut your exposure:

• An enclosed printer, which keeps emissions in one place.
• A HEPA filter for particles and activated carbon for VOCs.
• Venting the enclosure to the outside.

This matters most if you print ABS in a bedroom, a home office or a room shared with kids or pets.

Our take: an enclosure is the minimum for ABS and ASA indoors, but the filter or the outside vent is what actually removes the fumes. An enclosure on its own only holds them in until you open the door.

Dry-and-store checklist (print it and tick before each job):

• Wet signs checked: popping, bubbles in the purge, hazy surface.
• Spool weighed before drying and after each cycle.
• Temperature set from the chart for this material, with PLA never above 55°C.
• Separate thermometer at spool height if you're using an oven.
• A second cycle instead of a longer one if the spool still prints wet.
• Nylon printed straight from the dryer or vacuum-sealed at once.
• Fresh or recharged desiccant and a humidity card in every bag.
• Smoke detector in the print room.
• Ventilation on while drying and while printing.
• Styrene plastics (ABS, ASA) and nylon: enclosure plus a HEPA and carbon filter, or an outside vent.