PSU vs TPU

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

PSU vs TPU: PSU is known for very high heat resistance (tg ~187c) and retains..., while TPU is known for excellent layer adhesion. TPU is easier to print; PSU is less moisture-sensitive; PSU prints at higher nozzle temperatures (340-380°C vs 200-240°C). Choose PSU for very high heat resistance (tg ~187c) and retains..., or TPU for excellent layer adhesion.

Key differences at a glance

Property
PSU
TPU
Nozzle temp
340-380°C
200-240°C
Bed temp
140-180°C
30-60°C
Enclosure needed
Required
No
Ease of printing
Difficult
Easy
Moisture sensitivity
moderate
high

PSU

B

Polysulfone

Very high heat resistance (Tg ~187C) and retains strength near that range

TPU

S

Thermoplastic Polyurethane

Excellent layer adhesion; extremely impact resistant; highly durable

Detailed Comparison

Property
PSU
TPU
Tier Rating
Tier B
Tier S
Family
PSU
Flexible
Nozzle Temp
340-380°C
200-240°C
Bed Temp
140-180°C
30-60°C
Enclosure
required
not needed
Cooling
Low cooling
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

PSU Strengths

  • Very high heat resistance (Tg ~187C) and retains strength near that range
  • Resists water/radiation/chemicals; can be sterilized
  • Enables 'citizen science' type projects

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

PSU Caveats

  • Often nylon is a better overall choice unless you need the heat/sterilization envelope

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 PSU and TPU?
PSU prints at 340-380°C nozzle / 140-180°C bed (Required enclosure, moderate moisture sensitivity). TPU prints at 200-240°C nozzle / 30-60°C bed (No enclosure, high moisture sensitivity).
Is PSU or TPU stronger?
Our dataset does not include comparable tensile strength values for both. Qualitatively, PSU is suited to very high heat resistance (tg ~187c) and retains..., while TPU is suited to excellent layer adhesion.
Which prints at a higher temperature, PSU or TPU?
PSU prints at a higher temperature (340-380°C nozzle vs 200-240°C for TPU).
Is PSU 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 PSU.
Should I use PSU or TPU for flexible parts?
For flexible parts, TPU is usually the better fit (Excellent layer adhesion). Choose PSU instead when very high heat resistance (tg ~187c) and retains....

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