A parameter with a value of 5 indicates the highest degree of flexibility that a 3D printing filament can have. A material with this rating is very flexible, elastic and returns to its original shape after deformation, such as compression or bending. Its properties are most similar to rubber. It is used for printing products where the ability to absorb shock, resist wear and tear or act as a seal is required. Typical examples are flexible phone cases, tyres for models, sealing rings or cushioning pads. The actual printing with such soft materials requires specific printer setups, as the filament tends to bend in the material feeder before it reaches the nozzle due to its pliability. Often a so-called "direct drive" extruder is needed for reliable printing, which is a type of feeder where the motor that moves the filament is positioned directly above the hot end of the print head and pushes the material a short distance. This value is therefore used to quickly identify the filament intended for the creation of elastic and durable objects.