Precious Plastic is giving instructions on how to build a series of simple machines that will let makers turn plastic trash into new material.

Machined tooling contributes to the majority of production costs for many small-run jobs. 3D printing can reduce the cost of plastic cores, molds, and tooling, but there are several considerations ...

So he built a shredder, plus three different kinds of small-scale manufacturing machines: a rotational molding device, an extrusion machine, and an injection molding machine (The bulk of plastic ...