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This is my favorite DIY robot arm at the moment. The parts seem to be fairly high quality, and it has a leader / follower arm option if you build a second one:

https://github.com/AlexanderKoch-Koch/low_cost_robot/tree/ma...

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When looking at low cost arms I check how it connects to the mount. If it hangs on just a servo it will be very wobbly. Most mentioned in this thread are. For this price or bit more you can get a way better arm on ebay with big ball bearing on the base for stability. I got a kit for $60 or $80 recently. No servos, full metal. It's easy to add servos and put together, for now I have other arms assembled ;) No steppers because I want them to be cheap and imprecise for ML project.

Just got for $40 on amazon cheap arm with servos and bearing at the base. "Robot Arm Kits for Arduino Coding". Not that I need it, just like putting things together. Arduino not included, but I have it already. Let's see if I can use Raspberry Pico instead.

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