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About SunFounder

SunFounder is a technology company focused on Raspberry Pi and Arduino open source community development. Committed to the promotion of open source culture, we strive to bring the fun of electronics making to people all around the world and enable everyone to be a maker. Our products include learning kits, development boards, robots, sensor modules and development tools. In addition to high quality products, SunFounder also offers video tutorials to help you build your own project. If you have interest in open source or making something cool, welcome to join us! Visit for more!

About This Kit

The Rollpaw Kit is an interesting component kit for robotic arms based on Arduino. As the name suggests, it is used as a “paw” to grip objects. Being in a small size, the Rollpaw is composed of two 9g servos and some 3mm-thin acrylic plates. When the paw is opened, the maximum distance between the two grippers is 60mm. As a paw, it can be assembled to a variety of robot arms or robots. Thus you can use it to grip building blocks, beads, etc.

In this book, you can learn basics of how a mechanical gripper works and how to make one piece by piece. For more information, please go to our website and find the tutorial under LEARN -> Get tutorials.

Free Support

If you have any TECHNICAL questions, add a topic under FORUM section on our website and we’ll reply as soon as possible.

For NON-TECH questions like order and shipment issues, please send an email to You’re also welcomed to share your projects on FORUM.