pkooij/open-arms-mini

Open Arms Mini is an open-source hardware project that provides the design files, parts list, and assembly instructions for building a compact robotic arm you wear on your wrist to control a robot. This is called teleoperation, meaning a human operator moves a leader arm strapped to their own hand and wrist, and a follower robot arm mimics those movements in real time. The goal is to make robot training and human-in-the-loop corrections affordable and precise. The device has 7 degrees of freedom, meaning it can move in 7 independent ways that match how a human shoulder, elbow, forearm, and wrist actually move. It is 3D-printable using PLA or PETG plastic and costs roughly 150 EUR per arm for the required Feetech servo motors, a Waveshare controller board, screws, cables, and a power supply. A wrist strap is included to improve precision during wrist rotation. The arm integrates directly with LeRobot, an open-source robot learning framework from Hugging Face, and is recognized as the openarm_mini teleoperator type within that framework. You would use this if you are building or training a robot arm and need a cheap, human-sized controller to record demonstrations or make live corrections during robot operation. It is especially suited for precise tasks like cloth folding. No programming language is listed as primary since this is primarily a hardware design repository with STL and STEP files for 3D printing.