Servo Horn, Round 20mm with 25T spline for MG995, MG996R

thingiverse

There is a printable version of the common round metal servo horn that are sold just about everywhere. It will fit any brand of servo that uses 25T spline. I tested it on a common and cheap MG996R clone, and it fits perfectly, tight and wobbly-free. I have included a dimensioned drawing if you want to see the exact size of this part. I have also included all design files, including a 2D CAD drawing that describes the design of the spline. Since I couldn't find any details about the spline online, I measured it myself. A plastic servo horn will not be as strong as a metal one. The plastic can strip out under forced hard enough, which can actually serve as a kind of "mechanical fuse" and save other parts from breaking. If you want a more sturdy part, buy the metal ones.