Why do my servos buzz loudly even when stationary?

Question: Why do my servos buzz loudly even when not moving?

Answer: Loud buzzing from a servo when it’s not moving usually means it’s receiving a constant signal telling it to hold a position under load. This can happen if the servo is trying to maintain a position but is mechanically blocked or overloaded. First, check if the servo horn is physically jammed or if the linkage is binding. Next, ensure the servo isn’t being commanded to hold a position beyond its mechanical limits. If you’re using a microcontroller or receiver, verify the signal input is stable and within the servo’s range (usually 1–2 ms pulse width). Also, try disconnecting the servo signal and power to see if the buzzing stops; if it does, the issue is likely signal-related. If the servo is old or overheated (above 60°C), internal gears or motor wear can cause buzzing. For 3D printed parts, ensure no tight fits or friction points. Finally, consider lowering the servo torque or using a different model better suited for your application to reduce strain and noise.