What temperature should I dry PLA filament at?

Dry PLA between 45°C and 50°C (113°F - 122°F) for 4 to 6 hours. Do not exceed 50°C, because PLA has a low glass transition temperature (55°C-60°C); drying hotter will soften the filament and fuse the entire spool into a solid block.

Can you dry filament on a 3D printer heated bed?

Yes. Place the spool flat on the heated bed, cover it with a cardboard box with a few small holes poked in the top for moisture to vent, and set the bed temperature to your polymer's drying temperature (e.g. 50°C for PLA, 65°C for PETG). Rotate the spool every 2 hours.

3D Printer Filament Drying Time & Temp Calculator

Drying Temps & Times to Save Wet Spools

Never fuse a spool again. Get exact temperature ceilings and drying times for PLA, PETG, TPU, and engineering filaments.

1 Polymer & Spool Specs

Filament Material

Spool Material

2 Dryer Hardware & Exposure History

Drying Apparatus

Estimated Exposure

Common Wet Filament Symptoms

🔊 Audible snapping or popping at nozzle

🕸️ Excessive cobweb stringing & oozing

💥 Pitted, rough surface finish on perimeters

🪵 Brittle filament snaps easily in PTFE tube

Target Drying Temperature

50°C (122°F)

Recommended Time

6 Hours

Glass Transition (Tg)

58°C

⚠️

Keep temperature strictly under 55°C. Exceeding this will fuse the filament spool into a single block of plastic.

Recommended Dryboxes & Silica

Top-rated active heating dryers & color-indicating beads

Heated Filament Dryer → Color-Indicating Silica →

Why Wet Filament Destroys 3D Prints

Polymers used in FDM 3D printing are hygroscopic, meaning they chemically absorb water molecules from ambient room humidity. When water-laden filament enters a hotend at 200°C–280°C, the trapped moisture flash-boils instantly into steam. This miniature explosion creates steam voids in your extrusion line, resulting in audible popping sounds, inconsistent layer adhesion, and extreme stringing across travel moves.