On the other hand, they seemed simple enough to build, especially if you have a 3D printer. The extruders we’ve seen are much more complicated. Most of those, though, use pellets.

In a simple two-stage carbonization process, the fruit waste was heated at 850 ºC (1,562 ºF) for a few hours, and mixed with a molybdenum reactant.

Researchers have developed a way of recycling polyester. Their new method is simple, non-toxic for humans and the environment and, what’s more, it preserves the integrity of the cotton removed ...