Model Compatibility: Typically used in various Xerox or Canon printers, often in the developer or toner transport system Function: The 30th D.P Gear TEF plays a critical role in the developer assembly of the printer. It is responsible for transferring power and controlling the rotation of the developer roller, which applies toner to the imaging drum. Material: Usually made of durable plastic or metal with a Teflon (TEF) coating to reduce friction and wear over time Location: Located within the developer unit assembly, usually in the area where the developer roller interacts with other mechanical parts