Buying a desktop robot arm on the used market in the UK has become a realistic option for hobbyists, university students, and small workshop owners over the last three years. Where a genuine industrial cobot would cost tens of thousands of pounds even secondhand, benchtop arms from Elephant Robotics, Dobot, and Kinova now circulate on the used market at prices that match a mid-range 3D printer or laser cutter. This guide covers the four most commonly available models, explains what these arms can and cannot do, and tells you exactly what to inspect before handing over your money.
For buyers interested in full production-scale automation, see our full industrial cobot guide before reading further. Desktop arms are a separate category with different buyers, different use cases, and entirely different performance expectations.
What Is a Desktop Cobot, and Who Is It For?
The term "desktop cobot" covers robot arms small enough to bolt to a workbench, with payloads between 0.5kg and 4kg and reaches between 280mm and 600mm. They are not production tools in the industrial sense. You will not use one to weld car bodies, palletise boxes, or run a 24-hour shift. What they are good for is learning robotics, building pick-and-place demos, automating repetitive light tasks in a maker space, filming content, and running university research projects.
The buyers who get the most out of a used desktop arm tend to fall into four groups. First, hobbyists and makers who want to experiment with pick-and-place, small assembly jigs, or controlled camera movement on a tight budget. Second, students studying robotics, mechatronics, or automation who need hands-on hardware for coursework or personal projects. Third, small workshop owners doing very light, repetitive tasks such as placing PCB components or moving small parts between trays. Fourth, content creators who want a programmable camera or product-photography rig.
If your goal is production automation at any meaningful volume, look at the commercial and industrial robots section of the site instead.
The Four Models Worth Buying Used in the UK
Elephant Robotics myCobot 280 (Used: £600 to £900)
The myCobot 280 is the most popular entry-level desktop arm on the used market and the easiest recommendation for first-time buyers. It weighs roughly 850g, has a 280mm reach, and carries a 250g payload. That payload figure is important to understand correctly: 250g is the maximum the arm can move reliably at full extension, and that weight includes your gripper. A standard adaptive gripper weighs around 150g to 200g on its own, leaving you with 50g to 100g for the actual object. Plan your gripper choice carefully.
The myCobot 280 comes in several variants tied to different controller boards, including Raspberry Pi, M5Stack, and Jetson Nano editions. When buying used, confirm which controller is fitted, since this affects which software and ROS2 packages will work. The Raspberry Pi edition has the widest community support. Elephant Robotics maintains active GitHub repositories with Python SDK examples, ROS and ROS2 packages, and beginner tutorials. The community around this arm on Reddit and Discord is by far the most active of any desktop arm in this price range.
Check the wrist joint closely when inspecting a used unit. The myCobot 280 wrist is a known wear point, and heavy use with a poorly balanced gripper can cause play to develop. Rotate each joint slowly by hand with the arm powered off and feel for any roughness or looseness.
Dobot MG400 (Used: £3,500 to £5,500)
The Dobot MG400 sits at the upper end of the desktop arm market and behaves more like a scaled-down industrial arm than a hobbyist kit. It has a 440mm reach, a 750g payload, a rigid desktop footprint, and a build quality that noticeably exceeds the myCobot range. Dobot designed it for light industrial applications such as PCB handling and small assembly tasks, which means the mechanics and software are more production-oriented.
The MG400 connects via Ethernet and comes with Dobot's proprietary DobotStudio software as well as an open TCP/IP API that allows Python and ROS2 integration. The SDK is well-documented, though the open-source community around it is smaller than the myCobot ecosystem. If you are building a standalone automated station and want something that feels repeatable and reliable rather than experimental, the MG400 is the stronger choice. If you are a student who wants community forum help at 11pm, the myCobot 280 will serve you better.
When buying a used MG400, ask for the firmware version and check whether Dobot's update servers still support it. Early firmware versions had calibration issues that were resolved in later updates. Inspect the base mounting points for any signs of vibration stress or impact damage, and confirm the power brick is original, since third-party supplies have caused issues.
Browse current stock in our used Dobot MG400 listings.
Elephant Robotics myCobot Pro 600 (Used: £2,000 to £3,200)
The myCobot Pro 600 is the larger sibling of the 280, with a 600mm reach and a 2kg payload. It is a more capable arm for tasks that need to cover a larger workspace, such as sorting objects across a wider table, operating a camera over a larger scene, or handling objects that would exceed the 280's weight limit. The build quality is also meaningfully better than the base myCobot range, with metal joint housings replacing plastic ones in the wrist area.
ROS2 support follows the same pattern as the 280: Elephant Robotics maintains packages, and the community provides additional support. The Python SDK is compatible across the myCobot family, so code written for a 280 will largely transfer to the Pro 600 with reach and speed adjustments.
Used units at this price point often come from universities or research labs upgrading their hardware. Ask whether calibration was maintained and whether the arm has logged hours data available. A well-maintained lab unit is often in better condition than one that lived on a maker space shelf and was handled by dozens of different users.
Kinova Gen3 Lite (Used: £8,000 to £13,000)
The Kinova Gen3 Lite is the most capable arm in this guide and the most expensive by a considerable margin. It has a 902mm reach, a 4kg payload, seven degrees of freedom, and integrated force-torque sensing in the wrist. Those specifications put it in a different performance class from the other three models. It is a genuine research-grade arm used in university robotics labs, assistive technology research, and advanced manipulation projects.
The ROS2 integration on the Gen3 Lite is the strongest of any desktop arm available used in the UK. Kinova maintains official ROS2 packages with active updates, and there is a substantial body of published research and open-source code written around the platform. The force-torque sensing opens up compliant manipulation tasks that are impossible on a standard desktop arm, including gentle assembly, surface following, and human-robot interaction experiments.
At £8,000 to £13,000 used, this arm is not for casual hobbyists. It is the right purchase for a well-funded university project, a robotics startup building manipulation demos, or a serious researcher who needs a platform with proven community support and a real API. Browse available stock in our used Kinova Gen3 Lite listings.
Payload Reality: What These Arms Can Actually Lift
One of the most common mistakes buyers make when purchasing a desktop arm is overestimating what the payload figure means in practice. Payload is rated at full reach and includes everything attached to the end of the arm, including the gripper, any mounting hardware, cables, and the object being moved.
A myCobot 280 with a 250g payload and a 180g gripper attached can carry approximately 70g of actual object. That is roughly the weight of a AA battery. If your project involves moving objects heavier than that, the myCobot 280 is the wrong tool.
The Dobot MG400's 750g payload is more useful but still limited. A typical parallel gripper for the MG400 weighs 200g to 300g, leaving 450g to 550g for actual payload. That covers most small electronics components, light metal brackets, and standard PCBs, but not much heavier.
The myCobot Pro 600's 2kg payload and the Gen3 Lite's 4kg payload are substantially more practical for real automation tasks. If you are planning to move anything with physical weight, these are the minimum sensible choices.
Interface and Software: What to Verify Before Buying
Every arm in this guide connects via USB or Ethernet, and each has an open SDK or API. Proprietary-locked arms with no open interface are not worth buying for most buyers in this guide's target audience. Verify the following before committing to a purchase.
First, confirm the firmware version and whether manufacturer updates are still available. An arm running two-year-old firmware with no upgrade path may have known bugs that were fixed in later releases. Second, check ROS2 package compatibility: even a well-maintained package can fall behind on ROS distributions, and an arm that runs perfectly on ROS2 Humble may need community patches to work on Jazzy or later. Third, ask whether the original USB or Ethernet cable is included, since some desktop arms use proprietary connector pinouts that are hard to source separately.
Physical Inspection Checklist
When viewing a used desktop arm in person, work through these checks systematically. Power off the arm and rotate each joint slowly by hand through its full range of motion. You are feeling for roughness, grinding, clicking, or any looseness at the joint limit. Any of these suggests wear in the gear train or encoder, which is expensive to repair.
Inspect the joint housings visually for cracks, chips, or scuff marks indicating collision damage. Even a minor collision at speed can crack plastic housings or shift encoder calibration. Check the cable routing at each joint. Cables that have been repeatedly flexed against sharp edges will eventually fail, and signs of fraying or improvised repair are a warning sign. Confirm the power supply is original and that the input voltage matches UK mains.
Finally, run a basic test program before buying if the seller allows it. A simple joint-by-joint move-and-return sequence will reveal most mechanical or calibration issues within five minutes.
Where Desktop Arms Fit in the Broader Robot Market
Desktop cobots occupy a specific niche between hobbyist robot kits like the Niryo Ned and full industrial cobots like the Universal Robots UR3e or UR5e. They are more capable and programmable than toy arms, but they are not a substitute for production-grade hardware.
If your project requirements have grown beyond what a desktop arm can offer, the Robot AutoTrader robot database includes specifications for over 200 robot models across all categories, with filtering by payload, reach, and price range. Comparing desktop arm specifications against entry-level industrial cobots side by side is often the clearest way to establish whether a used desktop arm will genuinely meet your needs or whether you need to step up to a full industrial cobot.
For buyers who have already outgrown the desktop category, our full industrial cobot guide covers the UR3e, UR5e, Fanuc CRX, and other production-grade platforms available on the UK used market.
Summary: Which Arm Should You Buy?
The Elephant Robotics myCobot 280 is the right starting point for most new buyers. Its used price of £600 to £900, combined with the strongest open-source community of any desktop arm, makes it the lowest-risk way to start learning. The Dobot MG400 is the better choice if you need a more rigid, production-quality feel and are comfortable with a smaller community. The myCobot Pro 600 bridges the gap between entry-level and serious research at a reasonable used price. The Kinova Gen3 Lite is a research-grade platform for buyers who need force sensing, a mature API, and seven degrees of freedom, at a price that reflects all of those capabilities.
Whatever model you choose, verify the firmware, inspect every joint, and be honest with yourself about payload requirements before buying. A well-chosen used desktop arm bought carefully is one of the most cost-effective ways to build practical robotics skills in the UK today.