Hackka 1.75mm 1KG TPU 3D Printing Filament (Yellow) Flexible Filament with Soft Texture

The material is one of the easiest flexible materials to print. I haven’t measured the durometer, so I’m guessing 70A or a little softer.

nowhere near as soft of ninjaflex, but super easy to print and durable semi-flex filament on the cheap...

flexibility was as expected. I would rate this as a bit softer than sainsmart tpu which is what I was going for.