Semi-flexible TPU vs ASA
Compare Semi-flexible TPU and ASA filaments side-by-side so you can pick the right one for your 3D printing project.
Semi-flexible TPU
BMid-durometer TPU
Good balance for bumpers/hinges/impacty parts
ASA
AAcrylonitrile Styrene Acrylate
Excellent UV resistance (outdoors indefinitely), tough, matte surface
Detailed Comparison
Property
Semi-flexible TPU
ASA
Tier Rating
Tier B
Tier A
Family
Flexible
ASA
Nozzle Temp
210-230°C
220-275°C
Bed Temp
40-60°C
90-110°C
Enclosure
not needed
recommended
Cooling
Moderate cooling
Low to moderate; avoid drafts
Moisture Sensitivity
high
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
Semi-flexible TPU Strengths
- Good balance for bumpers/hinges/impacty parts
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
Semi-flexible TPU Caveats
- Too stiff for some flexible uses; too soft for some rigid uses
ASA Caveats
- Still off-gasses; enclosure/ventilation recommended
- Can still warp; needs tuning
Frequently Asked Questions
Is Semi-flexible TPU or ASA better for 3D printing?
ASA is generally rated higher (Tier A) compared to Semi-flexible TPU (Tier B). However, the best choice depends on your specific needs: Semi-flexible TPU is best for Good balance for bumpers/hinges/impacty parts, while ASA is best for Excellent UV resistance (outdoors indefinitely), tough, matte surface.
What are the temperature differences between Semi-flexible TPU and ASA?
Semi-flexible TPU prints at 210-230°C nozzle / 40-60°C bed. ASA prints at 220-275°C nozzle / 90-110°C bed.
Do Semi-flexible TPU and ASA need an enclosure?
Semi-flexible TPU: not needed. ASA: recommended.
Which is more beginner-friendly: Semi-flexible TPU or ASA?
Semi-flexible TPU is more beginner-friendly as it doesn't require an enclosure.