# How do I stop TPU stringing and jamming?

The supplied comments blame a Bowden path. A comment says TPU needs a direct drive. A comment says to slow down and ease extruder tension. describes seating the Bowden tube against the gear. None of them gives a retraction distance. The sheets below are print temperatures and drying cycles, not a stringing recipe.

The supplied comments blame a Bowden path. A comment says TPU needs a direct drive. A comment says to slow down and ease extruder tension. describes seating the Bowden tube against the gear. None of them gives a retraction distance. The sheets below are print temperatures and drying cycles, not a stringing recipe.

A jam in the tube and a hair between two points are different failures. The comments that arrived are about the tube. [Flexible filament](/answers/flex), [TPU in a multi-material unit](/answers/tpu_ams), [Shore hardness](/answers/tpu_hardness), and [stringing](/answers/stringing) are the overlaps. [TPU and nylon drying](/answers/dry_tpu_nylon).
## Speeds the sheets publish

[Bambu TPU 95A HF](/brand/bambu-lab/tpu-95a-hf) lists 220–240 °C (428–464 °F), a bed of 30–35 °C (86–95 °F), drying at 70 °C (158 °F) for 8 h, and speed up to 200 mm/s. Sheet checked 18 October 2026. [Bambu TPU for AMS](/brand/bambu-lab/tpu-for-ams) lists the same nozzle, bed, and drying, and speed up to 130 mm/s. [Bambu TPU 85A](/brand/bambu-lab/tpu-85a) lists 200–250 °C (392–482 °F), a bed of 30–35 °C (86–95 °F), the same 70 °C (158 °F) for 8 h, speed up to 200 mm/s, and Shore 85A. [NinjaFlex](/brand/ninjatek/ninjaflex-tpu) lists 210–240 °C (410–464 °F) and a bed of 30–60 °C (86–140 °F), dataset imported 13 October 2026, with no drying and no speed. None of the four stores a retraction distance.
## What the community says

[a Reddit thread in r/ender3](https://www.reddit.com/r/ender3/comments/118cl5l/) describes opening the path so the Bowden tube meets the gear, and says the jams stopped.

[a Reddit thread in r/ender3](https://www.reddit.com/r/ender3/comments/118cl5l/): A comment says TPU needs direct drive.

[a Reddit thread in r/FixMyPrint](https://www.reddit.com/r/FixMyPrint/comments/11uamyy/) says to slow a Bowden print and to loosen tension.

Updated 2026-10-25. Sources accessed 2026-10-25. Use case: Flexible.

## Ranked filaments

| Rank | Filament | Nozzle | Bed | Price per kg |
| --- | --- | --- | --- | --- |
| 1 | Bambu Lab TPU 95A HF | 220–240 °C (428–464 °F) | 30–35 °C (86–95 °F) | — |
| 2 | Bambu Lab TPU for AMS | 220–240 °C (428–464 °F) | 30–35 °C (86–95 °F) | — |
| 3 | Bambu Lab TPU 85A | 200–250 °C (392–482 °F) | 30–35 °C (86–95 °F) | — |
| 4 | NinjaTek NinjaFlex TPU | 210–240 °C (410–464 °F) | 30–60 °C (86–140 °F) | — |

## Sources

- [Bambu TPU 95A HF technical data sheet](https://cdn.shopify.com/s/files/1/0584/7236/6216/files/Bambu_TPU_95A_HF_Technical_Data_Sheet.pdf?v=1700101819) (datasheet)
- [Bambu TPU for AMS technical data sheet](https://cdn.shopify.com/s/files/1/0584/7236/6216/files/Bambu_TPU_for_AMS_Technical_Data_Sheet.pdf?v=1730944629) (datasheet)
- [Open Filament Database, NinjaTek NinjaFlex](https://api.openfilamentdatabase.org/api/v1/brands/ninjatek/materials/TPU/filaments/ninjaflex_tpu/index.json) (other)
- [a Reddit thread in r/ender3](https://www.reddit.com/r/ender3/comments/118cl5l/) (reddit)
- [a Reddit thread in r/FixMyPrint](https://www.reddit.com/r/FixMyPrint/comments/11uamyy/) (reddit)
- [a Reddit thread in r/FixMyPrint](https://www.reddit.com/r/FixMyPrint/comments/1alc4ek/) (reddit)
- [a Reddit thread in r/BambuLab](https://www.reddit.com/r/BambuLab/comments/zw18r6/) (reddit)
- [a Reddit thread in r/3Dprinting](https://www.reddit.com/r/3Dprinting/comments/rzadh2/) (reddit)
- [a Reddit thread in r/BambuLab](https://www.reddit.com/r/BambuLab/comments/1xeggzr/) (reddit)
- [a Reddit thread in r/prusa3d](https://www.reddit.com/r/prusa3d/comments/1xeova0/) (reddit)

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