Flexible filament bends under compression, so the feed path and print speed matter as much as temperature. Reliable TPU printing is mostly about keeping the material controlled.
Quick answer: Use a slow 20-35 mm/s profile, low retraction, a constrained filament path and dry TPU. Start within the spool temperature range, often around 210-240 C.
TPU starting settings
| Setting | Starting range | Why it matters |
|---|---|---|
| Nozzle | 210-240 C | Enough heat for steady flow without excess strings |
| Bed | 40-60 C or as directed | Supports first-layer stability |
| Speed | 20-35 mm/s | Reduces buckling and flow variation |
| Retraction | Low and conservative | Prevents repeated compression of soft filament |
Use the shortest controlled feed path
A direct-drive extruder is usually easier for TPU because the distance between drive gears and hot end is short. Bowden systems can work with firmer TPU, but need a well-constrained path.
Remove gaps where the filament can bend or escape beside the drive gear.
Slow down before changing flow
If extrusion becomes inconsistent, reduce speed before increasing flow. Flexible material can compress in the extruder and then release unevenly.
Use a steady speed for walls and infill while calibrating.
Keep TPU dry and retraction low
TPU can absorb moisture and show extra strings or a rough surface. Store TPU filament sealed with desiccant.
Excess retraction can increase jams. Tune temperature and travel first, then use the minimum effective retraction.
Design flexible parts intentionally
- Change wall thickness to control stiffness.
- Use infill pattern and density to tune compression.
- Avoid tiny unsupported details.
- Increase clearances for assemblies.
- Print a small material coupon before the final part.
Frequently asked questions
Can a Bowden printer print TPU?
Often yes for firmer TPU, but slow speed and a tightly constrained filament path become more important.
Why does TPU jam in the extruder?
The material may be buckling because of speed, pressure, a path gap or excessive retraction.
How do I make a TPU part stiffer?
Increase wall count, top and bottom thickness, and infill density before changing material hardness.
Continue learning
For flexible grips, feet, bumpers and protective parts, explore EPELAY TPU filament.
