Precious Plastic Small-scale extrusion screw for plastics recycling

Precious Plastic is an awesome open source effort to make small plastic-recycling machines readily available to folks around the world. If you don't know about it, check out PreciousPlastic.com for more info.

This extrusion screw is a special type of screw designed specifically for extruding plastic, the expanding inner thread puts pressure on the plastic as it melts, providing pressure for higher detail.

Normally extrusions screws are strictly industrial- extremely large, hard to source,