Uxcell Timing Belt Circumference Opening Fit Synchronous Pulley Wheel for 3D Printer 1. The open synchronous timing belt refers to the belt which ends are not glued together. It has high abrasion resistance and low noise ensuring that it can maintain good running ability during high load transmission reliable transmission and stable size. Widely used in 3D printers linear actuators intelligent plotter desktop CNC machines servo motor quilting machines conveyors small precision machinery transmission etc. 2. The 3D printer timing belt is made of PU material and steel core which ensures the belt s durability. Compared with the rubber black belt the white belt has a strong steel core PU metal fibers material with high strength keeps it strong. The tooth pitch is small the control accuracy is higher. 3. Check whether the wheel body of the open synchronous belt wheel is worn or cracked. Remove the old open synchronous belt select a suitable open synchronous belt and replace the one. 4. If the motor of your device makes a lot of noise it may be that the belt is too tight which will put a lot of pressure on the motor shaft and pulley so adjust the tightness of the belt before use.