For questions regarding Thermoplastic Elastomers which are flexible plastics.

Thermoplastic elastomers (TPE), sometimes referred to as thermoplastic rubbers, are a class of copolymers or a physical mix of polymers (usually a plastic and a rubber) which consist of materials with both thermoplastic and elastomeric properties.

It is useful for printing flexible 3D shapes, where the plastic has qualities similar to that of rubber.