TPU filament is a flexible 3D printing material made from thermoplastic polyurethane (TPU). Known for its rubber-like elasticity, durability, and impact resistance, TPU filament allows 3D printed parts to bend, stretch, and absorb shock without breaking.
Because of these properties, TPU has become one of the most widely used flexible filaments in FDM 3D printing.
At iSANMATE, we specialize in developing high-performance TPU materials designed for stable and reliable flexible printing.
In this guide, we’ll explore the properties, printing settings, applications, and advantages of TPU filament in FDM 3D printing.
For an in-depth overview, check out our comprehensive TPU Filament Guide where we cover everything about TPU for 3D printing.
Quick Answer: What Is TPU Filament?
TPU filament is a flexible 3D printing material made from thermoplastic polyurethane. It combines rubber-like elasticity with the durability of engineering plastics, allowing printed parts to bend, stretch, and absorb impact without breaking.
TPU is ideal for parts that need flexibility, durability, and impact resistance. This makes TPU filament widely used for phone cases, seals, wearable parts, and other functional flexible components.
What Is TPU Filament in 3D Printing?
TPU, or Thermoplastic Polyurethane, is a flexible filament known for its durability, elasticity, and impact resistance. The printing material is widely used in 3D printing to produce durable and elastic parts.
Unlike rigid materials such as PLA or PETG, TPU parts can bend repeatedly without breaking, making them ideal for functional components.
Best TPU filament printing settings
| Setting | Nozzle Temp | Bed Temp | Print Speed | Retraction Distance | Cooling Fan |
| Recommended Range | 210–250°C | 40–75°C | 20–80 mm/s | 0–2 mm | 30–80% |
Typical TPU filament printing settings include nozzle temperatures between 210–250°C, bed temperatures around 40–60°C, and slower printing speeds between 20–80 mm/s depending on printer setup. TPU maintains excellent flexibility while still providing strong mechanical strength and durability for functional parts.
Why Use TPU Filament in 3D Printing?
TPU filament is widely used in 3D printing because it combines flexibility with durability. Unlike rigid materials, TPU allows designers and engineers to produce parts that can bend, absorb shock, and withstand repeated stress.
Key Properties of TPU Filament
- Flexibility & Elasticity
TPU printed parts can stretch up to 300–600% of their original length, depending on hardness. - Durability & Abrasion Resistance
Resistant to wear, tearing, and impacts. - Chemical & Temperature Resistance
Resists oils, grease, and many solvents. It also performs well across a wide range of temperatures. - Low Shrinkage
Minimal warping compared to ABS, making it easier to print large flexible parts. - Vibration Dampening
Its soft nature makes it excellent for absorbing shock and vibrations. - Reliable performance across a wide temperature range
TPU offers reliable performance around -40°C to 80–120°C, depending on the formulation, because its unique block copolymer structure allows it to resist degradation and maintain structural integrity in harsh environments.
Because of these properties, TPU is ideal for functional parts that need both flexibility and mechanical strength.
Pros and Cons of TPU Filament
📍 Advantages
- Excellent flexibility and elasticity
- High impact resistance
- Durable and abrasion-resistant
- Good chemical resistance
- Low warping compared to ABS
📍 Disadvantages
- More difficult to print than PLA
- Can cause stringing if settings are incorrect
- Slower printing speeds are usually required
- Moisture-sensitive material
Understanding TPU Filament Hardness(Shore A Scale)
TPU filament hardness is typically measured using the Shore A scale, which indicates how soft or rigid a flexible material feels.
- 85A TPU: Soft and highly elastic, perfect for wearable items, soft grips, or flexible gaskets.
- 90A TPU: A balanced option with moderate flexibility and strength, suitable for functional parts that need some durability.
- 95A TPU: Harder and closer to rigid plastics, ideal for mechanical components or precise parts that need stability.
PEBA is another flexible 3D printing filament known for its extreme elasticity. Compared with TPU filament, PEBA materials can stretch further and recover their shape more efficiently, making it great for high-performance wearables, sports equipment, or parts that require repeated bending.
When choosing between TPU and PEBA, consider the required flexibility and resilience: softer TPUs or PEBA for highly elastic applications, and harder TPU for durability and mechanical precision. See our TPU vs PEBA Elasticity article for a full comparison.
Common TPU Filament Uses and Applications
Because of its flexibility, durability, and impact resistance, TPU filament is widely used across many flexible 3D printing applications.
📍 Consumer and everyday products
- Phone cases
- Watch straps
- Protective covers
- Cable organizers
- Shoe soles
- Wearable devices
📍 Mechanical and functional parts
- Gaskets and seals
- Vibration dampers
- Flexible hinges
- RC car tires
- Drone landing pads
📍 Protective machine components
- Robotics and prototyping
- Soft robotic components
- Flexible couplings
- Custom grips and pads
📍 Industrial applications
- Automotive interior components
- Protective equipment
- Flexible seals for machinery
- Industrial shock absorbers
For many makers, TPU becomes the go-to material whenever a part needs to flex instead of break. And iSANMATE TPU filament is widely used by makers and manufacturers for applications that require reliable flexible performance.
How TPU Filament Is Different from PLA, PETG, and ABS
To better understand TPU, it helps to compare it with common rigid filaments.
| 3D Printing Material | Flexibility | Strength | Impact Resistance | Ease of Printing | Best for |
| PLA | Low | Moderate | Low | Very easy | Toys |
| PETG | Low-Moderate | High | High | Easy | Functional parts |
| TPU | High | Moderate | Very High | Moderate | Flexible/elastic parts |
TPU stands out because it introduces elastic functionality that rigid materials cannot achieve.
Is TPU Hard to Print?
TPU filament for 3D printing is slightly more challenging to print than rigid materials like PLA or PETG. Because TPU is flexible, it can compress in the extruder during feeding.
However, modern formulations—such as high-flow TPU 95A filament developed by manufacturers like iSANMATE—are designed to improve extrusion stability and make flexible printing easier even at higher speeds.
With the right printer setup and proper settings, TPU can be printed reliably on most modern FDM 3D printers.
TPU Printing Tips:
✅ Reduce printing speed
✅ Minimize retractions
✅ Use a direct drive extruder if possible
✅ Keep filament dry
Moisture control is particularly important, since TPU is hygroscopic and can absorb water from the air.
Our iSANMATE manufacturing process addresses this through multi-stage drying and vacuum packaging, which helps maintain consistent print quality.
FAQ About TPU Filament
Q: Does TPU need drying?
Due to high moisture absorption rate of TPU, it’s strongly recommended to dry it before printing to prevent poor layer adhesion.
Q: Is TPU waterproof?
Yes. TPU is highly water-resistant and can withstand exposure to moisture
Q: Can TPU be used for functional mechanical parts?
Yes, especially harder TPU materials like 95A, which are durable and abrasion-resistant.
Q: Does TPU need a heated bed?
A heated bed is not always required for TPU, but using a bed temperature between 30–60°C can improve adhesion and reduce printing issues.
Q: How does TPU compare to PEBA?
PEBA is even more elastic and soft, suited for high-performance sports or wearable applications. Read our TPU vs PEBA Elasticity Comparison for details.
Q: Why is my TPU stringing?
Stringing is common due to its flexibility. Reduce retraction distance (0-2 mm) and speed (15-20 mm/s).
Q: How do I prevent bad layers?
TPU is highly hygroscopic (absorbs moisture). Dry it thoroughly before printing.
Q: Is TPU better than PLA?
It depends. TPU is better for flexible and impact-resistant parts, while PLA is better for rigid models and decorative prints.
Q: How do I get the best TPU printing results?
Using high-quality flexible TPU filament with consistent diameter and proper drying is essential. ISANMATE TPU filaments are produced with multi-stage drying and strict diameter control to ensure stable printing performance.
Recommended TPU Filament
High-performance flexible printing requires stable materials. Explore iSANMATE TPU 95A High-Flow Filament, engineered for high-speed printing, consistent extrusion, and excellent layer adhesion in flexible applications.
Final Thoughts
TPU filament has opened the door to functional flexible 3D printing, allowing makers to produce parts that bend, absorb impact, and withstand real-world use.
Whether you’re printing protective covers, mechanical components, or wearable items, iSANMATE offers a full range of high-quality TPU filaments designed for durability, elasticity, and consistent printing performance.
If you’re just getting started with flexible materials, our complete TPU Filament Guide covers everything from properties to printing tips and applications.
