[Video Link] Frits Lyneborg (creator of the delightful Yellow Drum Machine) kludged a gadget to carve the shape of a magnet's field.
Robotic 3D Carver of Invisible Stuff
[Video Link] Frits Lyneborg (creator of the delightful Yellow Drum Machine) kludged a gadget to carve the shape of a magnet's field.
Robotic 3D Carver of Invisible Stuff