Siraya Tech Rebound PEBA 85A User Guide

1. Introduction

Exceptional Energy Return – Delivers fast rebound (≈62% Bayshore) and a “bouncy” feel — ideal for midsoles, orthotics, and shock-absorbing components.

Lightweight Performance – About 12% lighter than TPU, reducing part weight without losing strength — perfect for sports gear, robotics, and mobile applications.

Flexible in the Cold – Stays tough and flexible even at -30 °C, ensuring reliability in outdoor or low-temperature environments.

Chemical & Fatigue Resistant – Built on a nylon (PA12) backbone, offering excellent resistance to oils, greases, and solvents for long-lasting durability.

2. Technical Specifications

Material  Polyether Block Amide (PA12 Elastomer)
Shore Hardness 85A
Density ~1 g/cm³
Bayshore Rebound 62% (ASTM D2632)
Diameter 1.75±0.03mm
Net Weight 800g
Available Colors White, Black

 

3. Before Printing: Handling and Storage

Drying

PEBA material is very easy to absorb moisture when exposed to air. Wet filament leads to poor print quality (oozing, stringing, bubbles, rough surface).

Handle: Dry the filament thoroughly before every print. Use a dedicated filament dryer or convection oven at 70-75°C for 4-6 hours.

Print Handling

It is recommended to put the filament into a dry box (humidity below 15%) immediately after opening for printing.

Storage

When not in use, store the filament back in the original aluminum foil bag, sealed tightly, ideally with desiccant packs.

4. Print Setting Recommendation

Nozzle Temperature  230-260°C
Nozzle Size:  ≥ 0.2mm are supported. 0.4mm is recommended
Bed Temperature 60-100°C
Print Speed 30-120 mm/s
Retraction Distance 0.4-1 mm
Retraction Speed 1800-3600 mm/min (30-60 mm/s)
Cooling Fan 50-100%
Build Platform Glass, PEI Film, or PC Film

 

Notes:

  • Bed Temperature: For large models, a higher bed temperature (e.g., 80-100°C) can help prevent warping.
  • Print Speed: Start with a conservative Print Speed (e.g., 40-60mm/s) and increase speed gradually.
  • First Layer: Print the first layer slower for best adhesion.
  • Retraction: PEBA 85A works well with low retraction settings.
  • Extruder: Direct drive extruders are generally recommended for flexible filaments, but this material is designed to be easier to print.
PEBA elastic filament

5. Post-Processing

Part Removal

Allow the bed to cool completely before attempting removal. Flexing the build plate (if applicable) usually helps release the print. Use a scraper carefully if needed.

Support Removal

Supports printed in PEBA can be challenging due to strong layer bonding. Optimize support settings in your slicer (e.g., increase Z distance). Compatible materials like PLA may be used for supports.

Finishing: 

PEBA is difficult to sand effectively.

Use a sharp craft knife or deburring tool to carefully trim away strings, blobs, or support remnants.

Briefly applying heat (e.g., heat gun on low setting, very quick pass with a torch flame) can sometimes smooth surfaces or reduce fuzziness, but exercise extreme caution to avoid melting or burning the part. Practice on test prints first.

6. Troubleshooting Common Issues

  • Stringing/Oozing/Bubbles: This is the most common sign of wet filament. Dry your filament thoroughly at 70-75°C for 4-6h. Also, optimize retraction settings (0.4-1 mm distance).
  • Rough Surface Quality: Also a primary symptom of moisture. Dry the filament.
  • Poor Bed Adhesion: Clean the build plate. Adjust Z-offset. Increase bed temperature (within 60-100°C range). Use a brim. Ensure the build surface is compatible (Glass, PEI, PC).
  • Weak Layer Adhesion: Dry filament. Increase nozzle temperature (within 230-260°C range). Adjust cooling fan speed (50-100%).

  • Extrusion Issues (Under/Over): Calibrate E-steps and flow rate. Check for partial clogs or restrictions in the filament path (including extruder gears and Bowden tube if applicable). Ensure filament spool can rotate freely.

7. Safety Precautions

Print in a well-ventilated area to avoid inhaling fumes.
Be cautious around the hot nozzle and heated bed during operation.
Refer to the Safety Data Sheet (SDS) for detailed safety information.

8. Contact & Support

For further assistance, questions, or feedback, please visit our website or contact our support team via support@siraya.tech.


Happy Printing!