I got a spool of it awhile ago, can't remember the brand name. Oh wait - it's TPU I think? Its really soft (like Shore A 35 or something) when you print at low temp but harder at high temp, so you can (theoretically) print a single "material" with different hardness.
I had a lot of troubling getting decent extrusion and adhesion at the lower foaming temp. Gave up and forgot about it. Been meaning to revisit it though bc Wifey needs a custom sole insert for her shoes.
I don't think thats what you're referring to though
