Have you seen those videos of those devices where a little marble draws patterns in sand, driven by a magnet? I've never owned one of those, but I can imagine myself staring at it for hours on end.

It’s charged with moving a small magnet to drag a ball bearing through the sand to draw patterns under the command of G-code generated with the Sandify tool.

From there, a sand casting mold is built around the pattern using sodium silicate in a 3-4% mix by weight with fine masonry sand. Once ready, the pattern is removed, and the mold is assembled ...

One way of doing this is to use rapid prototyping technologies. Rapid prototyping uses three-dimensional (3D) computer aided design to quickly fabricate a part or, alternatively, a sand mold for ...