This 85A TPU filament is the most flexible filament I tested so far. I already tested filaments with similar hardness (85A on Shore A scale), but hardness is one thing, the flexibility other.
The filament is more than 2 years old, but it was stored in vacuum bags and it was dried before printing.
Tested product (not affiliate link): https://azurefilm.com/product/flexibl...

Results you can download from: https://www.mytechfun.com/video/339

Contents:
0:00 Introduction
2:09 Drying
3:00 3D printing
6:03 Prolongation test
6:32 Tensile (pulling) test
6:45 Layer adhesion test
6:53 Ring test (compression)
7:14 Ring test (tensile)
7:43 Friction test
8:16 Washer test
8:54 Creep test
9:12 Temperature test
9:44 Results
12:31 Conclusions

#azurefilm #3dprinting #tpufilament #flexiblefilament