Polyformer is an open-source 3D-printed machine that recycles PET water bottles into filaments for 3D printers. It’s a cheap and compact solution for creating filament. The user cuts the water bottle into a long and consistent ribbon with a slicing tool and feeds the ribbon into the repurposed 3D printer hot end. The device thermoforms the ribbon into a 1.75-millimeter filament as it goes through the brass nozzle with the corresponding hole size. The user can then mount one end of the filament on the red motorized spool to automate the process.