PEKK vs TPU
Compare PEKK and TPU filaments side-by-side so you can pick the right one for your 3D printing project.
PEKK
APolyether Ketone Ketone
Nearly PEEK-class strength with far better print success rate
TPU
SThermoplastic Polyurethane
Excellent layer adhesion; extremely impact resistant; highly durable
Detailed Comparison
Property
PEKK
TPU
Tier Rating
Tier A
Tier S
Family
PEEK-family
Flexible
Nozzle Temp
340-380°C
200-240°C
Bed Temp
120-160°C
30-60°C
Enclosure
required
not needed
Cooling
Minimal
Moderate cooling
Moisture Sensitivity
high
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
PEKK Strengths
- Nearly PEEK-class strength with far better print success rate
- Described as one of the easiest high-end polymers to print once equipment checks pass
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
PEKK Caveats
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
Is PEKK or TPU better for 3D printing?
TPU is generally rated higher (Tier S) compared to PEKK (Tier A). However, the best choice depends on your specific needs: PEKK is best for Nearly PEEK-class strength with far better print success rate, while TPU is best for Excellent layer adhesion; extremely impact resistant; highly durable.
What are the temperature differences between PEKK and TPU?
PEKK prints at 340-380°C nozzle / 120-160°C bed. TPU prints at 200-240°C nozzle / 30-60°C bed.
Do PEKK and TPU need an enclosure?
PEKK: required. TPU: not needed.
Which is more beginner-friendly: PEKK or TPU?
TPU is more beginner-friendly as it doesn't require an enclosure.