TPE vs TPU Filament: Choosing the Right Flexible Material

When you need to 3D print parts that bend, stretch, or absorb heavy impacts, standard rigid plastics like PLA or PETG will not cut it. That’s why makers turn to flexible filaments like TPE and TPU. To understand the difference, you first have to look at their relationship.

Thermoplastic Elastomer (TPE) is a broad umbrella family of materials that combines the elastic properties of rubber with the melting and processing characteristics of plastic. Thermoplastic Polyurethane (TPU) is not a separate competitor to TPE, but rather a specific, more rigid subset within that same family. Both filaments excel at creating parts that are impact-resistant, waterproof, and highly durable against weathering and UV exposure.

So, how do they actually differ on the print bed and in real-world applications? Filaments marketed under the general TPE label are traditionally softer, more lightweight, and feel like true rubber. However, their extreme flexibility makes them less dimensionally stable under stress and more challenging to print. TPU, on the other hand, is more rigid and tough, which means superior abrasion resistance. Most importantly for makers, TPU’s rigidity makes it significantly easier to successfully 3D print, making it the preferred choice for functional and durable applications.

What is TPE? (Thermoplastic Elastomer)

Thermoplastic Elastomer (TPE) is a broad family of materials that behaves like rubber but processes like plastic. Its rubber-like behavior allows it to bend, compress, and return to its original shape. This makes it well-suited for applications where comfort, grip, and controlled deformation under load are important. TPE is also an umbrella category that encompasses subtypes including TPU, TPA and TPC.

In terms of material properties, TPE offers good impact resistance, excellent vibration damping, strong fatigue resistance, and decent chemical and UV resistance. It also performs across a wide temperature range (-30 to +140 °C) and is recyclable.

On the downside, its extreme softness makes it notoriously difficult to 3D print, often requiring slower print speeds, a direct drive extruder and carefully tuned settings to prevent buckling, under-extrusion and jamming.

Common applications include:

• Ergonomic grips and handles
• Gaskets and seals
• Cushioning shoe soles
• Medical equipment cushioning
• Sporting equipment padding

What is TPU? (Thermoplastic Polyurethane)

Thermoplastic Polyurethane (TPU) is a block copolymer consisting of alternating sequences of hard and soft segments. It is the most widely used flexible material in 3D printing because it balances flexibility and toughness. This characteristic makes it suitable for functional applications where both durability and elasticity are required.

The material has high resistance to abrasion, impact, and wear, and it is resistant to oils, greases, and many chemicals. Consequently, TPU is used for both functional prototypes and end-use products.

Common applications include:

• Phone cases,
• Shoes and shoe soles
• Automotive vibration dampers, seals, and tubing
• Sporting equipment
• Medical devices like tubing and protective equipment
• Industrial components

Head-to-Head Comparison: TPE vs. TPU

*Note that for shore hardness, there are no hard definitions for TPE and TPU, but the materials typically fall under these ranges.

When to Use Which?

Choose TPE if you need:

• Very soft, rubber-like behavior
• Maximum flexibility and stretch
• High vibration damping and cushioning
• Comfort-driven or soft-touch applications

Choose TPU if you need:

• A balance of flexibility, strength and durability
• Higher abrasion and wear resistance
• More consistent performance in functional parts
• More reliable and stable 3D printability
• Applications requiring repeated mechanical stress and durability

How to Print TPE and TPU Filament

Successfully printing flexible filaments requires adjusting your hardware and slicer configurations. When using TPE, a Direct Drive extruder is mandatory. Trying to push ultra-soft TPE through a long Bowden tube is like pushing a wet noodle through a straw; the filament will jam inside the tube long before it reaches the nozzle. When it comes to TPU, Direct Drive is highly recommended, but it can occasionally tolerate a well-tuned Bowden extruder.

Keep in mind that while printing with flexible filaments adds an exciting capability to your 3D printing toolkit, it comes with a learning curve. Because these materials behave like rubber, they are generally recommended for experienced makers who know how to fine-tune their machines.

The most common pitfalls include excessive stringing, poor bridging performance, and sudden nozzle clogs. Even worse, if the elastic filament meets too much resistance in the hotend, it will quickly buckle and wrap itself into a tangled nest inside your extruder gears. There is also a hardware risk: flexibles can permanently fuse to smooth PEI or glass build plates, tearing chunks out of your print surface upon removal.

To avoid these headaches, follow these essential best practices for printing flexible filaments:

• Slow Down the Speed: Reduce your print speeds to a conservative 20–30 mm/s. High speeds build up backpressure in the nozzle, which forces the flexible material to escape out the sides of your extruder drive gears.
• Loosen Extruder Idler Tension: Back off the tension on your extruder idler screw. You want just enough grip to push the filament gently. If the gears pinch too tightly, the soft material will deform and jam.
• Kill or Minimize Retractions: Turn off retractions completely, or limit them to a bare minimum (1–2 mm). Constant push-and-pull cycles stretch the filament and lead to immediate tangles around the drive gear.
• Use a Bed Release Agent: You can apply a layer of glue stick or Kapton tape to smooth PEI or glass beds. In this case, the glue serves as a sacrificial barrier so you can safely separate the printed part without destroying your build plate.
• Keep the Filament Dry: Flexible materials are highly hygroscopic, meaning they rapidly absorb moisture from the air. Always dry your filament before printing to eliminate bubbling, popping, and oozing.
• Adjust Your Thermals: Try increasing your nozzle temperature by about 5°C past your usual setting to reduce internal melting resistance, and turn off your print cooling fan entirely to ensure proper layer bonding.

Purchasing Flexible Filament

When shopping for flexible filaments, navigating product listings can be confusing, because TPU is a subtype of the broader TPE family. To understand what you are actually buying, look for the Shore Hardness rating in the technical specifications. Higher numbers mean a harder material, so keep in mind:

• If it says 95A: It is standard TPU, regardless of whether the box says TPE. It will be semi-flexible, highly durable, and relatively easy to print.
• If it says 85A or lower: It is either a true, ultra-soft TPE or a highly modified, premium TPU hybrid. This material will behave like rubber and will require a direct-drive setup.

The Cost Breakdown: Commodity vs. Specialty

The price difference when looking at TPE vs TPU comes down to manufacturing scale and consumer demand. Some of the well-known companies producing these filaments are Ninjatek, Fillamentum, Recreus, Polymaker, SainSmart, and Overture.

• TPU Pricing: Standard 95A TPU has become a mass-produced commodity plastic. Because the manufacturing chemistry is highly standardized, a standard 1kg spool of TPU is highly affordable, often priced nearly on par with standard PETG or PLA. Spools can cost anywhere from $20-$80, depending on the material specifications. Often, you’ll find them around $30.
• TPE Pricing: True, ultra-soft TPE filaments are more difficult to extrude into consistent filament lines and serve a smaller, more industrial market. So, TPEs are often sold in smaller 0.5kg spools. On a per-gram basis, true TPE can cost double the price of entry-level TPU. Some 0.5kg options cost around $40 per spool.

The Final Verdict

TPE and TPU are closely related flexible materials, but they are not interchangeable. TPE represents a broader family of ultra-flexible, rubber-like elastomers optimized for softness and comfort, while TPU is a more refined material within that family, engineered for durability, abrasion resistance and reliable real-world performance.

In practice, the decision comes down to a trade-off between softness and printability versus strength and reliability. TPE delivers maximum elasticity and a true rubber-like feel but is more demanding to process and offers lower dimensional stability. TPU provides a more controlled flexibility with significantly improved printability and enhanced mechanical durability.

A simple rule of thumb: If you are new to flexible filaments or need functional, durable parts, start with TPU. If you absolutely need maximum stretch, softness, and rubber-like shock absorption, brave the learning curve of TPE.

What do you prefer to print with? Let us know in a comment below or on our LinkedIn or Facebook pages! Plus, don’t forget to sign up for our free weekly Newsletter to get the latest 3D printing news straight to your inbox. You can also find all our videos on our YouTube channel.

*Cover Photo Credits: JAYO (left), CC3D (right).