Thermoplastic Elastomer is softer and more flexible than TPU, typically ranging from Shore 70A to 85A hardness. Extremely slow printing speeds are required for reliable extrusion. A direct drive extruder is mandatory — bowden setups cannot handle the flexibility.
Properties
- Flexibility — Softer than TPU, excellent for gaskets, seals, and grips
- Shore Hardness — Typically 70A-85A, similar to a rubber band
- Impact Absorption — Excellent vibration dampening and shock resistance
- Grip — High coefficient of friction, great for non-slip surfaces
- Durability — Good resistance to abrasion and repeated flexing
Best Practices
- Direct drive extruder is mandatory — bowden tubes cannot push soft filament
- Print extremely slowly (10-20 mm/s) to prevent buckling in the extruder
- Disable retraction or use very short retractions (0.5-1mm)
- Bed temperature 40°C on painter’s tape or PEI provides good adhesion
- No part cooling needed for most prints
- Loosen extruder tension to prevent filament deformation