While we don’t often see them in the hobbyist community, 3D printers that can extrude gels and viscous liquids have existed commercially for years, and are increasingly used for biological research.

Oral-B's Pro 3D toothpaste is suitable for sensitive teeth, and promises to get you whiter gnashers in just a day. Top-end toothpaste at a palatable price is a rare treat - but that's exactly what ...