Close-up of a heated metal nozzle drawing a strand of green plastic filament from a spool.
A black 3D-printed spool winding bright green recycled plastic filament.
A green plastic bottle clamped in a jig, being spiral-cut into a long strip on a workbench.
Filament-making machine: large spool, heated nozzle, temperature display reading 210, and take-up reel.