DOBOT MG400

Overview

The Dobot MG400 is an ultra-compact 4-axis desktop robotic arm starting at $3,780. Weighing just 8 kg, the MG400 is one of the lightest and most portable desktop robots in its class, making it accessible to small businesses, research laboratories, and educational institutions that need reliable automation without a permanent installation commitment. Despite its compact size, it delivers 500 g payload, ±0.05 mm repeatability, and a 440 mm maximum reach, which covers a practical range of desktop automation tasks.

Key Specifications

• Axes: 4
• Payload: 500 g
• Reach: 440 mm
• Weight: 8 kg
• Price: From $3,780

The MG400 connects via USB and Ethernet and is programmed through Dobot Studio, with APIs available for Python, C++, and ROS integration. This broad software compatibility makes it suitable for integration into automated test rigs, laboratory workflows, and educational robotics curricula.

Use Cases

UK universities and further education colleges use the MG400 as a teaching platform for robotics programming, automation concepts, and mechatronics courses. Its low cost and portable form factor make it feasible to equip a laboratory with multiple units for student hands-on exercises. Small manufacturing businesses use it for light inspection, sorting, and dispensing tasks where a full industrial arm would be disproportionate in cost and size.

In research contexts, the MG400 is used as a low-cost testbed for end effector development, computer vision integration, and human-robot interaction studies where the research focus is on the attached system rather than the arm itself.

Buying Used

Used MG400 units are readily available through Dobot distributors' refurbishment programmes and secondary electronics markets. Given the low original price, the second-hand discount is relatively modest, but the platform's simple mechanical design means used units in good condition retain most of their functional capability. Check the joint backlash on second-hand units as an indicator of wear.

Alternatives to Consider

• Dobot M1 Pro for higher payload and SCARA geometry at a modest price step up
• Elephant Robotics myCobot 320 for a 6-axis alternative at a similar price point
• Hiwonder ArmPi FPV for a much lower-cost educational-only option