eSUN TPU 95A Flexible Filament 1.75mm 

• Excellent soft texture ,with high resilience
• High transparency for natural or glass colors
• Anti-UV, no smelling and environmental-friendly
• Printing temp. is 215~220℃.

Note that flex filament is soft.  You need to take special steps to ensure a smooth printing of flex materials, no matter from which vendor.

Advantages:

• TPU rubber based.
• Shore A Hardness at 95A.
• Tensile Strength 30 MPa.

Some common steps people take to print flex:

• 1. print slow, like 40mm/s
• 2. No need heating bed, or suggest bed temp 60-80 ℃
• 2. might have to have a modified extruder, smoother feed path.