TPU (thermoplastic polyurethane) filament is a type of 3D printing material that is known for its flexibility and durability. It is often used to create functional parts, such as hinges and gears, as well as decorative items, such as phone cases and watch bands.

One of the main benefits of TPU filament is its flexibility. TPU has a high Shore hardness rating, which means that it is more flexible and resistant to deformation than other 3D printing materials, such as ABS or PETG. This makes it ideal for creating parts that need to bend or move without breaking.

TPU filament is also known for its durability. It is resistant to wear and tear, making it a good choice for functional parts that will be subjected to high stresses or heavy use. It is also resistant to many chemicals and UV light, which makes it suitable for outdoor use.

In terms of printing with TPU filament, it can be more challenging than other materials due to its flexibility. It is important to ensure that the print bed is level and that the print temperature is set correctly to avoid issues with bed adhesion or warping. It is also important to use a printer with a direct drive extruder, as TPU filament can be prone to jamming in bowden extruders.

Overall, TPU filament is a versatile and durable material that is well-suited for creating functional and decorative parts. It is an excellent choice for those looking to create parts that need to be flexible or resistant to wear and tear.