Kapton Tape, also known as Polyimide Tape, is an electrically insulating heat resistant tape that has many uses for 3D printing enviroment. Kapton tape is well suited for fastening heating elements. As such, it's the material of choice for fastening heating wire to the heater barrel of an extruder. Kapton can also be used to tape the temperature sensor to the printhead/extruder. Kapton tape is a good print surface for priting ABS on a Heated Bed. For ABS to stick to Kapton the Kapton needs to be hot (different sources mention minimum temperatures between 80-130 °C). Also the Kapton should be free of grease, grease can be removed with acetone or a propane torch.