PSU vs ASA

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

PSU vs ASA: PSU is known for very high heat resistance (tg ~187c) and retains..., while ASA is known for excellent uv resistance (outdoors indefinitely). ASA is easier to print; PSU prints at higher nozzle temperatures (340-380°C vs 220-275°C). Choose PSU for very high heat resistance (tg ~187c) and retains..., or ASA for excellent uv resistance (outdoors indefinitely).

Key differences at a glance

Property
PSU
ASA
Nozzle temp
340-380°C
220-275°C
Bed temp
140-180°C
90-110°C
Enclosure needed
Required
Recommended
Ease of printing
Difficult
Moderate
Moisture sensitivity
moderate
moderate

PSU

B

Polysulfone

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

ASA

A

Acrylonitrile Styrene Acrylate

Excellent UV resistance (outdoors indefinitely), tough, matte surface

Detailed Comparison

Property
PSU
ASA
Tier Rating
Tier B
Tier A
Family
PSU
ASA
Nozzle Temp
340-380°C
220-275°C
Bed Temp
140-180°C
90-110°C
Enclosure
required
recommended
Cooling
Low cooling
Low to moderate; avoid drafts
Moisture Sensitivity
moderate
moderate

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

ASA Strengths

  • Excellent UV resistance (outdoors indefinitely), tough, matte surface
  • Less warping than ABS; low viscosity enables very high speed printing
  • High heat tolerance (~boiling water range)

Considerations

PSU Caveats

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

ASA Caveats

  • Still off-gasses; enclosure/ventilation recommended
  • Can still warp; needs tuning

Frequently Asked Questions

What is the difference between PSU and ASA?
PSU prints at 340-380°C nozzle / 140-180°C bed (Required enclosure, moderate moisture sensitivity). ASA prints at 220-275°C nozzle / 90-110°C bed (Recommended enclosure, moderate moisture sensitivity).
Is PSU or ASA 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 ASA is suited to excellent uv resistance (outdoors indefinitely).
Which prints at a higher temperature, PSU or ASA?
PSU prints at a higher temperature (340-380°C nozzle vs 220-275°C for ASA).
Is PSU or ASA better for beginners?
ASA is better for beginners: enclosure is recommended and moisture sensitivity is moderate, vs required enclosure and moderate moisture for PSU.
Should I use PSU or ASA for outdoor use?
For outdoor use, ASA is usually the better fit (Excellent UV resistance (outdoors indefinitely)). Choose PSU instead when very high heat resistance (tg ~187c) and retains....

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