PEI vs TPU
Compare PEI and TPU filaments side-by-side so you can pick the right one for your 3D printing project.
PEI vs TPU: PEI is known for very strong, while TPU is known for excellent layer adhesion. Both have no enclosure requirements; PEI is less moisture-sensitive; PEI prints at higher nozzle temperatures (430°C vs 200-240°C). Choose PEI for very strong, or TPU for excellent layer adhesion.
Key differences at a glance
PEI
-Very strong, stable, and safe superpolymer; low thermal expansion enables good dimensional accuracy
TPU
SThermoplastic Polyurethane
Excellent layer adhesion; extremely impact resistant; highly durable
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
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 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