[Diffraction Limited] has been working on a largely 3D-printed micropositioner for some time now, and previously reached a resolution of about 50 nanometers. There was still room for improvement, ...

Ball and socket joints are useful, but making a part slide over the surface of a sphere, held by magnets, requires a lot of fiddling to get right. We admire persistence and nailing all the details.

You may have heard the term ball joint before and mistaken it for a ball and socket joint, which connects one bone to another. Ball joints on vehicles operate in much the same way, though. They ...