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TPU settings for the Bambu Lab A1

✓ Great match Intermediate Flexible

These are hardware-tuned starting settings for printing TPU on the Bambu Lab A1. The Bambu Lab A1 pairs a direct-drive extruder with an all-metal hotend on an open frame, and tops out at 300°C hotend / 100°C bed. Against TPU's ideal range (210–235°C), that lands us at 225°C nozzle and 50°C bed. TPU is flexible and prints best slow with a direct-drive extruder; Bowden setups must go very slow.

Quick answer: 225°C nozzle · 50°C bed · 25 mm/s · 1 mm retraction · 60% part fan. Change one setting at a time and validate with a small calibration model.
225°
Hotend
50°
Bed
25
mm/s
60%
Part fan

Recommended TPU profile

Hotend temperature225°C (tower 210–235°C)
Bed temperature50°C
Print speed25 mm/s
Retraction1 mm (direct drive)
Part cooling fan60%
Bed adhesionSticks well; print slow and disable extra retraction.
NozzleBrass 0.4 mm is fine
First layer speed15–20 mm/s; same bed temp, verify Z offset
Flow / extrusion multiplierStart at 100%; calibrate flow before touching retraction
DryingStrongly recommended — dry before printing if you hear popping or see inconsistent extrusion
💡 Best uses for TPU: phone cases, gaskets, wheels. Estimate the material cost of your next TPU print with the filament cost calculator.

How TPU behaves

StrengthFlexibilityHeatEaseDurabilityDetail

TPU property profile

Strength 50
Flexibility 100
Heat resistance 45
Ease of printing 55
Durability 90

Calibration order

  1. Dry the spool if it shows moisture symptoms, then confirm the nozzle and build plate are clean.
  2. Print a temperature tower inside the 210–235°C range; pick the lowest temperature with strong layer bonding and clean overhangs.
  3. Calibrate flow, then pressure/linear advance if your firmware supports it.
  4. Tune retraction last — more distance is not always better, especially on the direct-drive Bambu Lab A1.

TPU brands & what to expect

TPU comes in shore hardness grades (85A–95A most common). Softer TPU is harder to print, especially on Bowden machines. Brand matters less than shore rating and how slowly you’re willing to print.

🔎 Speed is everything with TPU — push it and the filament buckles instead of feeding. A direct-drive extruder transforms the experience; on a Bowden setup you’re limited to a crawl.

Popular TPU brands: eSUN, Overture, Polymaker, Hatchbox.

Common TPU problems on the Bambu Lab A1

SymptomLikely causeFix
Filament buckles / grindsToo fast, especially on BowdenSlow to 15–25 mm/s; minimal retraction.
StringingWet TPU or over-retractionDry; reduce retraction rather than increasing it.
Inconsistent extrusionLoose filament pathConstrain the path; reduce acceleration.

On the Bambu Lab A1 specifically: it is a fast machine, so if TPU looks rough, drop speed before blaming temperature — many "quality" issues here are really the hotend not keeping up with the flow.

TPU troubleshootingSymptoms, likely causes and a safe test orderCompare TPU across printersMaterial ranges and every per-printer profile

FAQ

What temperature should I print TPU on the Bambu Lab A1?
Start at 225°C for the hotend and 50°C for the bed, then run a temperature tower across 210–235°C to dial in your exact filament brand. Our temperature tower planner builds the tower for you.
What print speed works for TPU on the Bambu Lab A1?
Around 25 mm/s is a safe starting point. This printer can go faster once the profile is tuned, but start conservative for clean walls. Check your real speed ceiling with the max volumetric flow calculator.
What retraction should I use for TPU?
Use about 1 mm of retraction (direct drive needs very little). If you see stringing with TPU, raise retraction speed before distance and dry the filament first.
Do I need an enclosure for TPU on the Bambu Lab A1?
No, TPU prints fine in the open on the Bambu Lab A1.
Do I need a hardened nozzle for TPU?
No. TPU is not abrasive, so the stock brass 0.4 mm nozzle on the Bambu Lab A1 is fine.

Reviewed 2026-08-18. See how these starting settings are calculated. Numbers are conservative starting points, not lab measurements.