Foaming TPU Filament

Foaming TPU filament from Siraya gives you control over weight, softness, and performance in one flexible material. Our collection includes LW TPU filament and active foaming filament designed for makers who want lighter parts without giving up strength.

You can tune density and hardness by adjusting temperature. That means one spool can handle multiple use cases. Ideal for wearables, sports gear, drone parts, grips, and functional prototypes.

If you need reduced weight TPU that still holds up under stress, this collection is built for that.

Options That Match Real Needs

Different projects need different feel and weight.

• Tunable hardness from soft to firm
• Expandable TPU that lowers part density
• Up to 50% weight reduction
• Low-density TPU for moving assemblies
• Soft 3D printing filament for skin contact

One Spool, Adjustable Results

Print cooler for denser, firmer parts. Raise temperature to activate more foaming for lighter, softer results. This flexibility saves time and reduces the need to stock multiple materials.

Consistent Quality That Delivers Better Results

Lightweight should still mean durable.

• Strong rebound and fatigue resistance
• Impact-absorbing TPU structure
• Resists wear from bending and flexing
• Stable layer bonding during foaming
• Clean, soft-touch surface finish

This foaming flexible material keeps elasticity while cutting mass. Parts stay reliable for daily use, not just display.

Works with What You Already Use

No special setup required.

• Compatible with most FDM 3D printers
• Standard 1.75mm filament format
• Smooth feeding to reduce jams
• Predictable expansion when tuned properly
• Easy to dial in with common slicers

Compared to many lightweight TPU filament options, this active foaming filament maintains stable extrusion before expansion. That helps improve surface consistency and print success.

Built for Real-World Use

Designed for parts that move and absorb impact.

• Insoles and comfort pads
• Wearables and straps
• Protective cases and grips
• RC and drone components
• Functional prototypes that need rebound

You get a flexible lightweight filament that feels soft but performs like an engineering-grade material.

Explore Related Collections

• Flexible Filaments — More elastic materials for shock absorption and comfort-focused prints.
• Thermoplastic Polyurethane Filament — Standard TPU options for non-foamed flexible parts.
• Nylon Filaments — Strong, fatigue-resistant materials for high-stress applications.
• Strong 3D Printer Filament — High-performance materials for load-bearing functional prints.

FAQs on Foaming TPU Filaments

What is foaming TPU filament?

Foaming TPU filament is a flexible material that expands during printing. Heat activates a controlled foaming process inside the filament. This creates low-density TPU parts that are lighter and softer. You can adjust hardness by changing print temperature.

How is LW TPU filament different from regular TPU?

LW TPU filament reduces weight by expanding while printing. Regular TPU keeps the same density and hardness. Foaming flexible material lets you tune softness and part weight. Standard TPU does not offer that range.

Is foaming TPU filament hard to print?

Most active foaming filament works on common FDM printers. Correct temperature and speed settings are important. Once tuned, extrusion is stable and consistent. Many users find it as manageable as standard flexible filament.

What can I make with lightweight TPU filament?

You can print insoles, grips, wearables, drone parts, and protective gear. It is ideal for impact-absorbing TPU applications. Reduced weight TPU helps with comfort and moving assemblies. It also works well for functional prototypes.

How do I control hardness in expandable TPU?

Hardness depends on print temperature. Lower temperatures create denser and firmer parts. Higher temperatures increase expansion for softer results. This allows one spool to serve multiple flexibility needs.