Flex vs TPU
Compare Flex and TPU filaments side-by-side. See which one is best for your 3D printing project.
Flex
-Versatile 3D printing filament
TPU
SThermoplastic Polyurethane
Perfect layer adhesion; extremely impact resistant; nearly indestructible
Detailed Comparison
Property
Flex
TPU
Tier Rating
Tier null
Tier S
Family
Flexible
Flexible
Nozzle Temp
220-260°C
200-240°C
Bed Temp
40-85°C
30-60°C
Enclosure
not needed
not needed
Cooling
Moderate cooling
Moisture Sensitivity
low
high
Strengths Comparison
Flex Strengths
TPU Strengths
- Perfect layer adhesion; extremely impact resistant; nearly indestructible
- Great for combat robots, tactical/rough-use parts
- Rubber-like parts (gaskets, grips, bumpers, wheels)
Considerations
Flex 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 Flex or TPU better for 3D printing?
TPU is generally rated higher (Tier S) compared to Flex (Tier null). However, the best choice depends on your specific needs: Flex is best for various applications, while TPU is best for Perfect layer adhesion; extremely impact resistant; nearly indestructible.
What are the temperature differences between Flex and TPU?
Flex prints at 220-260°C nozzle / 40-85°C bed. TPU prints at 200-240°C nozzle / 30-60°C bed.
Do Flex and TPU need an enclosure?
Flex: not needed. TPU: not needed.
Which is more beginner-friendly: Flex or TPU?
Both Flex and TPU are beginner-friendly options.