A simple but practical enclosure designed for the popular low-cost servo testers commonly found online.
 

If you’ve ever used one of these modules, you probably noticed that they usually come in a thin plastic shell (or no enclosure at all), making them awkward to mount in a project. This design solves that problem while keeping the tester compact, protected, and easy to integrate into DIY builds. 🔧
 

✨ Features
 

✅ Compact and lightweight design
 

✅ Easy access to the control knob
 

✅ Clearly marked cable routing
 

✅ Printed labels for input and output connections
 

✅ Universal lid design
 

✅ Two mounting options included
 

🔩 Two Case Versions
 

Two enclosure variants are provided:
 

Version 1 – M3 Heat-Set Inserts
 

Designed for users who want a more durable assembly.
 

The mounting holes accept M3 heat-set inserts, allowing the enclosure to be opened and closed repeatedly without wearing out the plastic.
 

Version 2 – Direct M3 Screw Mounting
 

A simplified version with smaller mounting holes.
 

Perfect if you want to secure the lid directly using standard M3 screws without installing inserts.
 

Universal Lid
 

The same lid fits both enclosure versions, making printing and assembly straightforward. 👍
 

🏷️ Built-In Labels
 

Both the enclosure and the lid include markings showing:
 

🔌 Input side
 

🔌 Output side
 

➡️ Cable orientation
 

This makes wiring much easier during installation.
 

⚠️ However, always double-check your connections before powering the device.
 

While all of the most common servo testers that I tested used the same connector orientation, different manufacturers may occasionally use a different layout.
 

🤖 Great for DIY Electronics
 

These inexpensive servo testers are useful far beyond testing servos.
 

They can be used anywhere you need a quick and adjustable PWM signal source, including:
 

• ESC testing
   

• Brushless motor control
   

• RC experiments
   

• DIY robotics
   

• Actuator testing
   

• Fan and propulsion projects
   

• General electronics prototyping
   

The large control knob allows very fine adjustments, making them surprisingly useful for tuning applications where even a small change in signal matters.
 

💡 Why I Designed This
 

This project was actually born while working on another build. 😄
 

I was developing an electric fan prototype and needed a way to securely mount a servo tester instead of having it slide around the table while controlling motor speed.
 

At some point I realized that a spinning propeller and a loose servo tester were not the combination I wanted anywhere near my fingers… 😂
 

So rather than trusting the original flimsy enclosure, I designed a proper mounting solution.
 

The result is a simple, practical case that turns a cheap servo tester into a component that’s actually pleasant to use in real projects. 🚀