Polymaker PolyFlex TPU90 1.75mm 0.75kg Black - Flexible, UV Resistant

In this review of Polymaker PolyFlex TPU90 filament, the bottom line is simple: it is aimed at hobbyists and small-scale makers who need a durable, flexible material that prints reliably on common FDM/FFF machines. The single biggest reason to buy is the combination of high shore 90A elasticity with careful spool preparation that minimizes tangles and moisture pickup, making it a practical choice for wearable parts, gaskets, and outdoor components where UV resistance matters.

Key Features

• Shore 90A flexibility: Provides a tough, rubbery feel that maintains shape memory while still allowing for resilient bends and compression.
• UV resistant: Formulated to withstand outdoor exposure so printed parts like bike components or phone cases hold up longer in sunlight.
• Easy to print: Prints at moderate temperatures and speeds without hardware modifications on most desktop FDM/FFF printers, reducing setup time.
• Tangle and moisture free: Supplied dried, vacuum-sealed in a resealable bag with desiccant and wound to prevent tangles for trouble-free feeding.
• Strong layer adhesion: Delivers consistent, bubble-free and warp-free layers when correct print settings are used, improving part durability.

Who It's For

PolyFlex TPU90 is best for makers who need a firmer flexible filament for functional prints: seals, gaskets, shoe parts, watch bands, and protective cases. It suits users running printers like the Prusa i3 mk3 and other common desktop models because it requires no special hardware and prints well at the recommended settings.

Users who require an extremely soft elastomer (much lower shore hardness) or who need rigid engineering plastics should look elsewhere; this product is optimized for resilient, rubbery parts rather than hard structural components.

Pros & Cons

Pros

• Excellent durability and color consistency that users report as high quality and functional for repeated use.
• Prepared spool packaging (vacuum-sealed with desiccant) reduces moisture-related print failures and tangles.
• Good printing window and layer adhesion that enable jam-free, warp-free prints when using recommended temperatures and speeds.

Cons

• Some users find adhesion to itself or perceived softness varies by setup, so fine-tuning retraction and bed settings may be needed.

Specifications

Material	Thermoplastic polyurethane (TPU)
Diameter	1.75 mm
Weight	0.75 kg
Shore Hardness	90A
Nozzle Temperature	210 C - 230 C
Bed Temperature	25 C - 60 C
Printing Speed	30 mm/s - 60 mm/s (fan on)

Our Verdict

PolyFlex TPU90 is a solid choice for makers who need a firmer flexible filament that prints cleanly on standard desktop FDM machines. With UV resistance, careful spool handling, and a usable temperature window, it offers reliable value for wearables, seals, and outdoor parts while requiring only modest tuning for best adhesion.

Frequently Asked Questions

Can this filament be used on most desktop FDM printers?
Yes. PolyFlex TPU90 is compatible with nearly all desktop FDM/FFF printers and generally requires no hardware modifications.

How should the spool be stored after opening?
Keep the filament in the resealable vacuum bag with the desiccant when not in use and secure the tip to avoid nodes and tangles.

What settings work best?
Recommended settings are 210 C - 230 C nozzle, 25 C - 60 C bed, and 30 mm/s - 60 mm/s print speed with part cooling (fan on).