Rotrics is a modular desktop robot arm that helps makers and designers to create wonderful things on their desktop. It also can be used in a lightweight production line such as smartphone production. It comes in a modular design and 0.05mm-high precision at an affordable price. The modular end-effector structure allows users to switch modules in seconds, with no need to handle screws and cables. Rotrics features a noiseless motor, modular design, and versatile modules.