3D printer filament Fiberlogy FiberFlex 40D TPU Black 1.75 mm, flexible thermoplastic polyurethane

Fiberlogy FiberFlex 40D TPU Black 1.75 mm is a flexible thermoplastic polyurethane filament formulated for FDM/FFF 3D printing. With an approximate Shore hardness of 40D and a 1.75 mm diameter, this black TPU offers a balance of elasticity and mechanical strength suitable for parts that require flexibility, impact resistance and durable surface finish. The filament is intended for printers capable of handling flexible materials and is supplied in a form compatible with common direct and Bowden extrusion systems when appropriate print settings are applied.

Advantages

FiberFlex 40D provides consistent extrusion and layer adhesion for flexible prints while maintaining elasticity after cooling. Its Shore ~40D hardness makes it soft enough for wearable applications yet firm enough to retain shapes and dimensional stability. The black color delivers good visual contrast and a uniform surface appearance. Designed for FDM/FFF workflows, the filament supports reliable printing of resilient components with reduced risk of brittle failure compared to harder TPU grades.

Suitable for

• Flexible prototypes and functional models that require bendability
• Wearable parts such as straps, bands and soft enclosures
• Seals, gaskets and flexible connectors
• Shock-absorbing components and bumpers
• Small flexible hinges and snap-fit features

Key specifications

• Material family: Thermoplastic polyurethane (TPU)
• Hardness: approximately Shore 40D
• Diameter: 1.75 mm
• Color: Black
• Filament type: Flexible, elastomeric filament for FDM/FFF printers

How to use

Load the filament into a printer configured for flexible materials and select print parameters suitable for TPU: moderate print speed, reduced retraction or tuned retraction settings, and a nozzle temperature and bed setup recommended for TPU. Use a feeder and path that minimise bends and compression to prevent filament buckling, especially with Bowden setups. Allow prints to cool sufficiently between layers when required for dimensional accuracy. Follow manufacturer guidance for extrusion temperatures and print speeds specific to Fiberlogy TPU grades.

Usage recommendations

For best results, print FiberFlex 40D on a clean build surface with good bed adhesion (e.g., PEI sheet, glue stick or blue tape as appropriate), use a direct drive extruder when possible for improved filament control, and fine-tune retraction and speed to reduce stringing. Store the filament in a dry environment or sealed container with desiccant to maintain print quality over time.