Fibreheart TPU-GF Filament User Guide

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1. Introduction

Siraya Tech Flex TPU-GF is built upon our robust TPU 64D formula, reinforced with 15% Glass Fiber.

This addition significantly enhances stiffness, impact strength, and dimensional stability, making it the ultimate choice for printing heavy-duty engineering components that require a unique blend of elasticity and extreme structural integrity.

2. Specifications

  • Material: TPU + 15% Glass Fiber (GF)

  • Base Shore Hardness: >64D (Perceived hardness is higher due to GF reinforcement)

  • Diameter: 1.75mm

  • Weight: 1kg spool

  • Color: Black (Matte finish)

  • Nozzle Requirement: Hardened Steel / Ruby / Tungsten Carbide (0.4mm or larger)

  • Printing Temperature: 220 - 250Β°C

  • Bed Temperature: 40 - 60Β°C

  • Printing Speed: 30 - 80mm/s

  • AMS Compatibility: Compatible with Bambu Lab AMS (Original) and AMS Lite. NOT compatible with AMS 2.

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3. Before Printing: Preparation

  • Dry Before Use (Essential): Glass fiber creates microscopic channels that can trap moisture. Wet TPU-GF will result in severe oozing and brittle parts.

    • Method: Dry at 50-60Β°C for 6+ hours before printing.

  • Nozzle Check: The standard brass nozzle is not compatible. The glass fibers will erode brass nozzles rapidly, ruining both the nozzle and your print accuracy. Install an abrasion-resistant nozzle (Hardened Steel, etc.) before loading this filament.

4. Printing Recommendations

Settings

  • Nozzle Temperature: 240-270Β°C. Glass fiber improves thermal conductivity, so the material melts efficiently. Start at 240Β°C.

  • Bed Temperature: 40-60Β°C. For textured PEI plates, the lower end (45Β°C) often works well as the material releases easily when cool.

  • Print Speed: 30-100mm/s. The added stiffness allows for faster printing than unreinforced TPU.

  • Retraction: Minimize retraction. The fibers increase friction inside the nozzle.

    • Direct Drive: 0.8mm - 1.5mm @ 25-35mm/s.

    • Bowden: 2.0mm - 4.0mm (tune carefully).

  • Layer Height: 0.2mm is standard. Avoid very low layer heights (<0.1mm) as fibers can cause clogging in restricted flows.

  • Cooling: Low to Medium (20-50%). High cooling can reduce layer adhesion, which is critical for reinforced parts.

Hardware & AMS Usage: AMS / AMS Lite

    • Loading: The filament is rigid enough to load reliably.

    • Wear Warning: Glass fiber is abrasive. While compatible, extensive use may accelerate wear on the AMS internal plastic filament paths and feeder gears. Monitor your AMS components over time.

    • Incompatibility: Do not use with AMS 2.

5. Post-Processing & Safety

Handling the Printed Part

  • Matte Finish: The part will come off the bed with a smooth, matte texture that hides layer lines exceptionally well.

  • Support Removal: Supports may be stiffer than standard TPU. Use pliers. The interface usually separates cleanly due to the fiber content.

Sanding and Machining (Important)

  • Safety Hazard: Unlike pure plastic, sanding this material produces dust containing micro-glass particles.

  • Protection: You MUST wear a dust mask (N95 or better) and safety goggles if sanding, drilling, or machining the parts to prevent inhalation of glass dust or eye irritation.

  • Wet Sanding: Highly recommended to keep dust particles trapped in water rather than airborne.

6. Troubleshooting

  • Nozzle Wear: If print quality degrades (diameter inconsistencies), check if you accidentally used a brass nozzle. It may have widened.

  • Brittle Parts: Usually indicates moisture. Dry the filament longer.

  • Clogging: Ensure your retraction distance is not too high. Heat creep can cause the fibers to bunch up in the cold zone.

7. Support

For technical inquiries regarding industrial applications or chemical resistance data, please contact us at support@siraya.tech.

Seeking help in a Facebook group. Posting your question here can also help other users with the same problem: Siraya Tech Filament Facebook Group