PEI vs ASA
Compare PEI and ASA filaments side-by-side so you can pick the right one for your 3D printing project.
PEI vs ASA: PEI is known for very strong, while ASA is known for excellent uv resistance (outdoors indefinitely). PEI is easier to print; PEI prints at higher nozzle temperatures (430°C vs 220-275°C). Choose PEI for very strong, or ASA for excellent uv resistance (outdoors indefinitely).
Key differences at a glance
PEI
-Very strong, stable, and safe superpolymer; low thermal expansion enables good dimensional accuracy
ASA
AAcrylonitrile Styrene Acrylate
Excellent UV resistance (outdoors indefinitely), tough, matte surface
Detailed Comparison
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 Strengths
- Very strong, stable, and safe superpolymer; low thermal expansion enables good dimensional accuracy
- Once setup is met, prints relatively friendly
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
PEI Caveats
- Setup requirements too extreme for S tier
- Cannot print on PEI-coated plate repeatedly (bonding/plate damage risk)
ASA Caveats
- Still off-gasses; enclosure/ventilation recommended
- Can still warp; needs tuning