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Features & specifications
Bambu Lab TPU 75A is an ultra-soft 2.85mm thermoplastic polyurethane filament made for the Bambu Lab H3C and its FlexFeed extruder. At a 75A hardness it is one of the softest flexible materials available for FFF printing, with the cushioning and skin-friendly feel needed for wearables such as shoes, watch bands, padding, and other parts that are worn, bent, and squeezed every day.
Highlights
- Ultra-soft and wearable. A 75A Shore hardness and high rebound give real cushioning, and the material is certified for skin contact.
- Fast, reliable flexible printing. The larger 2.85mm diameter pairs with the H3C FlexFeed extruder to reach a 10mm³/s volumetric flow rate, about three times a conventional 1.75mm setup in internal lab testing.
- Natural matte finish. Retuned to print without the oily sheen common to TPU, leaving a smooth, skin-like texture.
- Built to take a beating. Over 800% elongation at break and strong tear and abrasion resistance suit parts that flex and wear all day.
Mechanical Properties
| Property | TPU 75A |
|---|---|
| Shore hardness | 76 ± 1 A |
| Tensile strength (XY) | 11.5 ± 0.5 MPa |
| Elongation at break (XY) | Over 800% |
| Tear strength (Z) | 14.0 ± 0.8 N/mm |
| Rebound resilience | 50% |
| Abrasion volume loss | 116mm³ |
| Density | 1.17 g/cm³ |
Specifications
| Material | TPU 75A (thermoplastic polyurethane) |
| Diameter | 2.85mm ± 0.05mm |
| Net weight | 1 kg per roll |
| Format | With Bambu reusable spool |
| Printers | Bambu Lab H3C only |
| Hotend | Hotend for 2.85mm filament, with 0.4mm, 0.6mm, and 0.8mm recommended. Not compatible with the standard or high flow nozzles |
| AMS | Compatible with the AMS 3H. Not compatible with the AMS, AMS lite, AMS 2 Pro, AMS HT, or the TPU Feeding Assist Module |
| Build plates | Textured PEI Plate or Smooth PEI Plate. Any plate except the Cool Plate SuperTack |
| Nozzle temperature | 200-250°C |
| Bed temperature | 30-35°C |
| Print speed | Under 200mm/s |
Printing and Care
- Must be dried. This filament absorbs moisture quickly. Dry it before printing, either in a forced-air oven at 70°C for 8 hours or on the printer heatbed at 90°C for 16 hours, and use a large dry box so the spool does not deform.
- Seal it after use. Store unused filament right away in a sealed container with desiccant, below 20% relative humidity.
- Load it correctly. Set Flow Dynamics Calibration to Auto, and never insert it directly into an AMS feed inlet, which can damage the machine. It can be combined in multi-material prints with filaments other than PLA and PETG.
- Print safely. Use a well-ventilated area, and keep filament and fragments away from children and pets. This filament is not food-grade, so do not use finished prints for food storage or contact.