Then a 3D printer produces it using flexible TPU. The pour is then simplicity itself, using a casting cement mix at a consistency similar to pancake batter.

These have an inner track printed from flexible TPU filament, and an outer layer formed by casting silicone directly onto the 3D printed core. It’s a somewhat involved process, ...

Covestro's Platilon TPU film is intended for applications such as athletic footwear, pulse oximeters and other biometric sensors that demand repeated compression, flexing and resistance to creasing.