Flexible filament bends in the feed path when resistance, path length, tension or speed are too high. A short direct path and low pressure usually work better than increasing temperature.
Check the path
- Short direct feed.
- Correct feeder tension.
- No sharp bends.
- Clean nozzle.
Reduce load
Lower speed and acceleration, use little or no retraction and maintain stable pressure. Soft TPU needs support along the path.
Validate
- Continuous extrusion.
- Thin walls.
- Long print.
| Cause | Signal | Action |
|---|---|---|
| Long path | Buckling | Shorten |
| High tension | Deformation | Adjust |
| Speed | Pressure | Slow |
| Retraction | Kink | Reduce |
Common engineering mistakes
- Using PLA profile.
- Increasing retraction.
- Wet TPU.
- Long Bowden path.
- Changing many settings.
Buyer checklist
- Is the path short?
- Is tension correct?
- Is TPU dry?
- Is speed moderate?
- Does extrusion remain stable?
Describe printer and TPU through our quote form.