How to dry TPU filament
Dry TPU at 50–60 °C for 6–12 h.That is the consensus range from dryer and filament manufacturers — the exact same values the filament drying chart & timer uses, where you can start a countdown for this cycle. TPU is high — flexible filament soaks up moisture readily, so expect moisture trouble after a day or two in a humid room.
50–60 °C
for 6–12 h — TPU drying temperature and time
| Material | TPU |
| Temperature | 50–60 °C |
| Time | 6–12 h |
| Note | — |
Wet TPU symptoms
The symptom TPU shows most characteristically is bubbly, foamy extrusion and stringing on what used to print clean. Beyond that, the general wet-filament signs apply: popping, crackling or hissing from the nozzle as steam bursts out of the melt, stringing and oozing that retraction tuning cannot fix, a fuzzy or unexpectedly matte surface, and weak parts that snap along layer lines. If a spool that printed fine before storage now shows any of these, dry it before touching a single slicer setting.
Drying notes for TPU
TPU dries cool enough that spool deformation is rarely a concern — standard plastic spools tolerate this range fine.
TPU needs the longest drying times relative to its temperature — moisture leaves the flexible core slowly, so do not cut the cycle short. When the cycle finishes, print immediately or move the spool into a sealed dry box with desiccant — and if you are unsure how much is left on the spool afterwards, the spool remaining calculator turns a scale reading into grams, meters and percent.
Step by step
- Confirm it is wet — bubbly, foamy extrusion and stringing on what used to print clean, or popping and stringing after storage. When in doubt, dry anyway; it does no harm.
- Check the spool rating before applying heat.
- Set the dryer to 50–60 °C and run the full 6–12 h.
- Print immediately or store dry — sealed box or bag with fresh desiccant.
Frequently asked questions
What is the TPU drying temperature?
Dry TPU at 50–60 °C for 6–12 h. These are the consensus manufacturer ranges — the same values the MakerCalc drying chart & timer uses.
How long does it take to dry TPU?
Plan for 6–12 h at 50–60 °C. Moisture leaves the core of the wind slowly, so cutting the time short dries only the outer loops — when in doubt, dry longer rather than hotter.
Can I dry TPU on its spool?
TPU dries cool enough that spool deformation is rarely a concern — standard plastic spools tolerate this range fine.
How do I know if my TPU is wet?
The clearest sign for TPU is bubbly, foamy extrusion and stringing on what used to print clean. Also listen for popping or hissing from the nozzle and check for weak layer bonds. TPU picks up moisture over a day or two in a humid room, so a spool that printed fine last month can print badly today.
Can I dry TPU in a kitchen oven?
It works, but household ovens commonly swing ±10 °C around the set point. Verify the actual temperature with a separate oven thermometer, use the fan setting if available, and never leave it unattended — a filament dryer or food dehydrator with a real thermostat is the safer option.