Customizable Servo Horn

Create custom servo horns – chose the number of arms, the length of the arm, the number of holes and more.

The default values for the servo spline are for Futuba 3F splines. They will fit onto any Futuba 3F compatible servo. If you need horns for different servos, you can adjust the servo spline parameters accordingly. The table below shows values for some other servo models contributed by Maker World users.

Print the servo horns sideways on the print bed to increase resolution of the teeth. The examples are printed in PLA with 100% infill, 0.08mm layer height and a 4mm nozzle on an X1C.

These horns are useful for prototyping and for small loads. Any significant loads will quickly wear down the teeth. Use metal servo horns for that.

Spline values:

	Futuba 3F	MG90S	Savox SH-0264MG Plus	Spektrum A335	FMS 09A 9g	MG996R
Spline External Diameter	5.92	4.80	4.85	4.90	3.65	5.68
Spline Screw Diameter	2.5	2.5	2.5	1.95	2.0	3.25
Shoe Height	4.0	4.0	4.0	2.2	3.0	3.8
Tooth Count	25	21	21	21	15	25
Tooth Depth	0.3	0.3	0.3	0.3	0.3	0.3
Tooth Base Width	0.7	0.8	0.8	0.7	0.8	0.7
Tooth Tip Width	0.1	0.1	0.1	0.0	0.1	0.1

User @eappelboom tested PETG horns on AliExpress MG90S (TP marking on base), and got the best results with spline external diameter of 4.6 instead of 4.8.

Updates

2026-04-16: Values for MG996R added. Thanks to @eplumber for providing the values.

2026-02-04: Values for FMS 09A 9g added. Thanks to @user_3731317899 for providing the values.

2025-12-10: Values for Spektrum A335 added. Thanks to @Pras333 for providing the values.

2025-12-10: Values for Savox SH-0264MG Plus added. Thanks to @derzelas for providing the values.

2025-02-19: Values for MG90S servos added. Thanks to @user_1847633404 for providing the values.

2024-11-13: Added STL files for more standard sizes and a 3MF file combining them all for an easy print. Just select the plate with the right number of arms, and skip any horns you don't want to have printed.

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