SainSmart Flex TPU Air, 1.75mm Lightweight Foaming TPU Filament, 1kg, Adjustable Hardness 77A–93A, High Resilience & Matte Finish, Easy Printing & No Clogging, for Wearables, Sports Gear (White)

Product Details

• [Customizable Softness & Hardness (77A–93A)]: Want your prints tough or soft? Flex TPU Air lets you control hardness by adjusting temperature and speed. Lower temperatures yield durable, strong parts; higher temperatures trigger foaming for lighter, softer prints
• [Super Lightweight]: Thanks to advanced active foaming technology, Flex TPU Air can expand up to 172% in volume while staying strong and elastic. Compared to regular TPU, it reduces weight by up to 50%, meaning 1 kg of TPU Air prints the same volume as 2 kg of standard TPU. Perfect for large models, cushions, or wearable items without the usual bulk
• [Bounce Back Instantly]: Flex TPU Air springs quickly return to their original shape after compression. Ideal for shoes, wristbands, sports gear, or any project that needs soft yet durable performance. Your parts stay flexible and comfy even under stress
• [Smooth Matte Finish]: Say goodbye to rough layer lines! Prints have a premium matte surface and a soft-touch feel, perfect for grips, protective cases, or anything that touches skin directly. Comfort meets style in every print
• [Versatile for Various Applications]: Flex TPU Air 3D printer filament is perfect for a wide range of projects. Whether you’re printing sports gear, insoles, grips, wristbands, protective cases, soft toys, or medical support devices, it delivers lightweight, flexible, and resilient performance for both functional and creative designs. Ideal for DIY makers, wearable tech, and professional applications alike

From the listing on Amazon.

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Printing SainSmart TPU

SainSmart TPU in Matte White runs on the TPU profile below, and this listing is a 1kg spool. TPU is best suited to flexible, rubber-like parts such as phone cases, gaskets, and vibration dampers. Brands and even individual spools vary, so treat these as starting points and run a quick temperature tower to lock in the sweet spot for your printer.

Ranges checked against Bambu Lab and Prusa data. Heat resistance is the heat deflection temperature (HDT). Read our TPU filament guide for bed adhesion, drying, troubleshooting, and material-specific tips.

Nozzle Compatibility

Flexible filament is not abrasive, so brass and hardened steel both work. Size matters more: the higher pressure in a small nozzle makes soft filament buckle in the extruder.

Based on Bambu Lab and Prusa guidance. More in our nozzle types guide.