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[Newbie] Cheapest way to get robot arm hardware for hobby

Hi there, I’m thinking of getting a hobby to make robot arms. I’m okay with the scope being small. And I prefer to concentrate on tinkering with the software than the hardware.

How can I get my hands on low costs hardware parts for a robot arm?

Have you checked out the open manipulator?
It’s not the cheapest option but would have you up and running quickly with a user base to help if you run into issues.