Really Simple Robot Arm (Patreon)
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I wanted to build something that was accessible and not too expensive for people wishing to understand and experiment with inverse-kinematics. I thought while I was doing that it might also become part of my ongoing ball contraption project.
Essentially it's very similar to a robot dog leg, but even simpler because the third axis is linear rather than rotary. CAD and code will get published before it goes public on Tuesday 2nd March.
Next week's video for Patrons should be the Really Useful Robot Arm - but this video is quite a good primer for that because it's very similar, but tipped on its side.