TPU, or Thermoplastic Polyurethane is a very common form of elastic polymer, or elastomer, capable of being used on any properly equipped FDM 3D printer. Of the many kinds of flexible 3D printer filaments, TPU is slightly more rigid, making it easier to extrude and use. It is a medium-strength material with very high flexibility and durability, able to withstand much higher compressive and tensile forces than its more common counterparts PLA and ABS.
TPU filament is commonly used to 3D print a wide variety of items. For everyday use, TPU is great for making custom phone cases, rubber mats, and stress toys. In the R/C hobby department, TPU can be used for tires or shock absorbers and is even occasionally utilized to make o-rings and seals. In the world of DIY, TPU is fantastic for flexible parts or casings, as well as parts that need to have resistance to sudden impacts and movement, for applications such as vibration dampening and shock absorption.