PEI 9085 vs TPU

Compare PEI 9085 and TPU filaments side-by-side so you can pick the right one for your 3D printing project.

PEI 9085 vs TPU: PEI 9085 is known for very strong, while TPU is known for excellent layer adhesion. TPU is easier to print; PEI 9085 is less moisture-sensitive; PEI 9085 prints at higher nozzle temperatures (350-400°C vs 200-240°C). Choose PEI 9085 for very strong, or TPU for excellent layer adhesion.

Key differences at a glance

Property
PEI 9085
TPU
Nozzle temp
350-400°C
200-240°C
Bed temp
120-160°C
30-60°C
Enclosure needed
Required
No
Ease of printing
Difficult
Easy
Moisture sensitivity
moderate
high

PEI 9085

A

Ultem 9085

Very strong, stable, and safe superpolymer; low thermal expansion enables good dimensional accuracy

TPU

S

Thermoplastic Polyurethane

Excellent layer adhesion; extremely impact resistant; highly durable

Detailed Comparison

Property
PEI 9085
TPU
Tier Rating
Tier A
Tier S
Family
PEI
Flexible
Nozzle Temp
350-400°C
200-240°C
Bed Temp
120-160°C
30-60°C
Enclosure
required
not needed
Cooling
Minimal
Moderate cooling
Moisture Sensitivity
moderate
high

Green marks the generally easier or more forgiving option in that row, based on tier, enclosure needs, and moisture sensitivity. It is not always the better choice for a specific job, so weigh it against what your project actually needs.

Strengths Comparison

PEI 9085 Strengths

  • Very strong, stable, and safe superpolymer; low thermal expansion enables good dimensional accuracy
  • Once setup is met, prints relatively friendly

TPU Strengths

  • Excellent layer adhesion; extremely impact resistant; highly durable
  • Great for combat robots, tactical/rough-use parts
  • Rubber-like parts (gaskets, grips, bumpers, wheels)

Considerations

PEI 9085 Caveats

  • Setup requirements too extreme for S tier
  • Cannot print on PEI-coated plate repeatedly (bonding/plate damage risk)

TPU Caveats

  • Slow printing; retraction can cause jams (especially in Bowden setups)
  • Stringing is common
  • Very moisture sensitive; wet TPU prints poorly

Frequently Asked Questions

What is the difference between PEI 9085 and TPU?
PEI 9085 prints at 350-400°C nozzle / 120-160°C bed (Required enclosure, moderate moisture sensitivity). TPU prints at 200-240°C nozzle / 30-60°C bed (No enclosure, high moisture sensitivity).
Is PEI 9085 or TPU stronger?
Our dataset does not include comparable tensile strength values for both. Qualitatively, PEI 9085 is suited to very strong, while TPU is suited to excellent layer adhesion.
Which prints at a higher temperature, PEI 9085 or TPU?
PEI 9085 prints at a higher temperature (350-400°C nozzle vs 200-240°C for TPU).
Is PEI 9085 or TPU better for beginners?
TPU is better for beginners: enclosure is no and moisture sensitivity is high, vs required enclosure and moderate moisture for PEI 9085.
Should I use PEI 9085 or TPU for flexible parts?
For flexible parts, TPU is usually the better fit (Excellent layer adhesion). Choose PEI 9085 instead when very strong.

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