This design is from my personal collection.
The is part of a bigger design. It was 3D printed and tested.
You can find out more about this system on my [Instructable page](https://www.instructables.com/DIY-3D-Printed-Robotic-Arm-Actuator/) and the files can be downloaded on my [Printables page](https://www.printables.com/model/930858-3d-printed-robotic-arm-actuator/files)