# Which filaments absorb moisture, and how do I tell if filament is wet?

A pop at the nozzle followed by a gap is the sign the leading comment treats as water boiling in the melt. PETG bubbles can instead be a random Z seam, and three of these five threads are not about moisture.

A pop at the nozzle followed by a gap is the sign the leading comment treats as water boiling in the melt. PETG bubbles can instead be a random Z seam, and three of these five threads are not about moisture.

Wet filament in this bank is a sound and a hole, not a brand list. Dry the spool to the temperature on its own row.

## The pop

[r/FixMyPrint 1098exl](https://www.reddit.com/r/FixMyPrint/comments/1098exl/) is PLA at 200 °C (392 °F) and a 60 °C (140 °F) bed, with a gap right after a pop. The score-80 reply says the water boils in the nozzle and the vapor blows a pocket in the extrusion. A score-17 reply says a new spool can already be wet. A score-12 reply says a pop can be an air gap after a hotend was tightened cold.

200 °C (392 °F) and 60 °C (140 °F) sit inside [SUNLU PLA](/brand/sunlu/pla), which lists 190–230 °C (374–446 °F), a bed of 50–70 °C (122–158 °F), and drying at 50–55 °C (122–131 °F) for 8 h. They also sit inside [PolyLite PLA](/brand/polymaker/polylite-pla), which lists 190–230 °C (374–446 °F), a bed of 25–60 °C (77–140 °F), and drying at 55 °C (131 °F) for 6 h. 60 °C (140 °F) is the top of that bed. How to dry, and how the community bands differ from these sheets, is [drying](/answers/drying). Closed storage is [storage](/answers/storage). The measured table is the [filament drying dataset](/data/filament-drying).

## PETG bubbles

[r/prusa3d 1mndze5](https://www.reddit.com/r/prusa3d/comments/1mndze5/) is bubbles in PETG on a CORE One, 0.4 mm nozzle, 235 °C (455 °F). The score-88 reply asks if the Z seam is random. The poster says it is, and the next replies treat that as the cause. A score-14 reply says it might be wet. 235 °C (455 °F) is inside [PETG HF](/brand/bambu-lab/petg-hf) at 230–260 °C (446–500 °F), and below [SUNLU PETG](/brand/sunlu/petg) at 240–260 °C (464–500 °F). SUNLU's drying line is 60–65 °C (140–149 °F) for 6–8 h. PETG HF lists 65 °C (149 °F) for 8 h.

[Overture Easy Nylon](/brand/overture/easy-nylon) lists 245–260 °C (473–500 °F) and a bed of 50 °C (122 °F), and the catalog stores drying at 95 °C (203 °F) for 7 h. The threads do not print it. It is here because nylon is the high-drying material in the catalog set. [PLA](/material/pla), [PETG](/material/petg), and [nylon](/material/pa6) are the material pages.

## Threads that say absorb and mean something else

[r/prusa3d 1ilu19b](https://www.reddit.com/r/prusa3d/comments/1ilu19b/) is a CORE One "absorbing heat" for about 7:40 before PETG. The score-71 reply says an unenclosed MK4 has only the room to soak. A score-53 reply says the gcode is waiting on a chamber temperature.

[r/3Dprinting 11u348w](https://www.reddit.com/r/3Dprinting/comments/11u348w/) and [r/functionalprint 11u37q5](https://www.reddit.com/r/functionalprint/comments/11u37q5/) are the same laser-level case joke. The title mentions an ABS shell and a flexible outer. The top comments are not a moisture test. [SUNLU](/brand/sunlu) and [Polymaker](/brand/polymaker) are the brand indexes.

Updated 2026-10-20. Sources accessed 2026-10-20. Use case: Drying.

## Ranked filaments

| Rank | Filament | Nozzle | Bed | Price per kg |
| --- | --- | --- | --- | --- |
| 1 | SUNLU PLA | 190–230 °C (374–446 °F) | 50–70 °C (122–158 °F) | — |
| 2 | Polymaker Polylite PLA | 190–230 °C (374–446 °F) | 25–60 °C (77–140 °F) | — |
| 3 | SUNLU PETG | 240–260 °C (464–500 °F) | 60–70 °C (140–158 °F) | — |
| 4 | Bambu Lab PETG HF | 230–260 °C (446–500 °F) | 65–75 °C (149–167 °F) | — |
| 5 | Overture Easy Nylon | 245–260 °C (473–500 °F) | 50 °C (122 °F) | — |

## What the community says

r/FixMyPrint 1098exl shows gaps that appear right after a pop, printing PLA at 200 °C (392 °F) and a 60 °C (140 °F) bed. The score-80 reply says the pop is water boiling in the nozzle and the vapor blowing a hole in the extrusion, and says to dry the spool. A score-21 reply describes the same steam gap. A score-17 reply says filament can arrive wet. A score-12 reply says popping is not always moisture and describes a hotend rebuilt at room temperature that left an air gap. r/prusa3d 1mndze5 shows bubbles in two PETG spools on a CORE One with a 0.4 mm nozzle at 235 °C (455 °F). The score-88 reply asks if the Z seam is random. The poster says it is. Two more replies treat the random seam as the cause. A score-14 reply says that, or it is wet. r/prusa3d 1ilu19b asks why a CORE One absorbs heat for about 7:40 before PETG when an MK4/S does not. The score-71 reply says an MK4 without an enclosure has only the room to heat. A score-53 reply says the gcode is waiting on a chamber temperature. r/3Dprinting 11u348w and r/functionalprint 11u37q5 are a joke about a laser-level case. The title says ABS and a flexible shell. The top comments are jokes.

## Sources

- [SUNLU filament wiki](https://www.sunlu.com/wiki/61) (manufacturer)
- [SUNLU PETG product page](https://www.sunlu.com/products/petg-3d-printing-filament) (manufacturer)
- [PolyLite PLA technical data sheet](https://cdn.shopify.com/s/files/1/0548/7299/7945/files/PolyLite_PLA_TDS_EN_V5.4.pdf) (datasheet)
- [Bambu PETG HF technical data sheet](https://store.bblcdn.com/ce12d65176a94f1086e6aefa238e62e2.pdf) (datasheet)
- [Open Filament Database, Overture Easy Nylon](https://api.openfilamentdatabase.org/api/v1/brands/overture/materials/PA6/filaments/easy_nylon/index.json) (other)
- [Community source, r/3Dprinting 11u348w](https://www.reddit.com/r/3Dprinting/comments/11u348w/) (reddit)
- [Community source, r/functionalprint 11u37q5](https://www.reddit.com/r/functionalprint/comments/11u37q5/) (reddit)
- [Community source, r/prusa3d 1ilu19b](https://www.reddit.com/r/prusa3d/comments/1ilu19b/) (reddit)
- [Community source, r/FixMyPrint 1098exl](https://www.reddit.com/r/FixMyPrint/comments/1098exl/) (reddit)
- [Community source, r/prusa3d 1mndze5](https://www.reddit.com/r/prusa3d/comments/1mndze5/) (reddit)

HTML: https://filamentfacts.com/answers/hygro