Flexible TPU filament eSun 1.75 mm high-speed, fluorescent yellow, 1 kg spool

eSun flexible TPU filament 1.75 mm high-speed in fluorescent yellow is a thermoplastic polyurethane filament designed for FDM/FFF 3D printers that accept 1.75 mm material. Supplied on a 1 kg spool, this filament targets applications that require elasticity, abrasion resistance and a smooth surface finish while supporting higher extrusion speeds than standard TPU grades. The fluorescent yellow color provides high visibility for prototypes, wearable parts and functional components.

Advantages

This TPU high-speed filament combines flexibility with improved flow characteristics for faster printing while preserving elastic recovery and good layer adhesion. It offers consistent diameter tolerance for steady extrusion, a bright fluorescent pigment for clear visibility, and a surface finish that reduces post-processing for many applications. The spool format and filament diameter are compatible with most consumer and prosumer 1.75 mm extruders.

Suitable for

• Flexible prototypes and functional parts requiring elasticity
• Wearable components such as straps, inserts and soft fittings
• Gaskets, seals and vibration-damping elements
• High-visibility parts and safety markers

Key specifications

• Material type: thermoplastic polyurethane (TPU), high-speed formulation
• Nominal diameter: 1.75 mm
• Net weight: 1 kg spool
• Color: fluorescent yellow
• Mechanical properties: flexible with good elasticity and abrasion resistance
• Surface: smooth finish suitable for visible parts
• Compatibility: designed for FDM/FFF 3D printers using 1.75 mm filament

How to use

Load the filament into a printer configured for 1.75 mm material and set up a direct-drive or suitably tuned Bowden extruder to handle flexible filaments. Use nozzle temperatures and print speeds appropriate for TPU high-speed grades — start with manufacturer-recommended temperature ranges for TPU and adjust extrusion multiplier and retraction settings to minimize stringing. Print on a clean, level build plate with a low to moderate first-layer speed and consider a glue stick or PEI sheet to improve adhesion. Cool parts gently between layers to preserve elasticity and prevent deformation.

Usage recommendations

Store the filament in a dry environment to prevent moisture absorption. For consistent results, dry the spool before printing if exposed to humid conditions. When printing complex geometries, reduce retraction and use slower travel moves; when higher throughput is required, test incremental increases in speed while monitoring extrusion stability and surface quality.