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3D-printable High torque servo/gear reduction

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3D model description

Video can be found here:

Editable Fusion 360 source files can be found here:

I've created a Universal Motion Controller to control the position on this servo. More info can be found here:

This servo/gear reduction uses mostly 3D-printed parts. The servo uses a 775 36V 9000rpm brushed DC-motor wich is driven by a BTS7960B motor driver wich is controlled by an arduino mega 2560. The stall torque of the servo is about 55kg/cm wich is about 5.39 Nm. the peak current is about 18 amps when using a 6s LIPO battery (about 22-24V). the reduction ratio is 1:30. I originally wanted to use some 20mm ball bearings for the outputshaft but they didn't arrive in time so I ended up using two 20mm holes and a lot of lubrication. For the intend of filming the internals of the servo for possible faillures, I printed some collored gears and lasercut a 5 mm acrylic lid. Unfortunatly I didn't get to film any awsome footage of gears exploding because they were far to strong ;-). Even at a peak torque of 54kg/cm they didn't show the slightest form of flexing or cracks. The two middle gears (blue and red one) use a stainless steel shaft of 6mm diameter. The holes of the gears are designed at 6.2mm diameter so they would fit nicely around the 6mm shaft but some additional filing/sanding might be required. The same might has to be done for the 20mm shaft holes.

I uploaded the dxf of the lid so people with a laser cutter can cut the lid out of transparant acrylic.

Video can be found here:

More info can be found here:

Components used:

1 × 775 Motor DC 12V-36V 3500-9000RPM Motor Large Torque High Power Motor

1 × Arduino nano V3

1 × L298N motor driver

1 × Heat shrinks

2 × stainless steel shaft
dimensions: 6mm diameter, 70mm lenght

2 × M5 bolt and nut
dimension: 40mm lenght

1 × 20mm steel tube
dimension: 125mm lenght

2 × screws 15mm lenght
dimension: 4.5mm diameter, 15mm lenght

5 × screws 35mm lenght
dimension: 4.5mm diameter, 35mm lenght

Recommended Tools:


Have a nice day!

  • 3D file format: DXF and STL
  • Last update: 2020/11/17 at 17:14
  • Publication date: 2020/10/25 at 01:27





Designs 20
Downloads 140
Sales US$40
Followers 5

I'm a maker. I design and create my own projects and build them from scratch. My favorite tools are my 3D-printer and laser cutter. I own a 3D printer since 2014 and still use it almost every day. I like to design 3D models and sometimes also animate it. Besides 3D printing and modeling I also like aviation a lot. I fly RC drones, helicopters and planes.

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