Recycled filament is 3D printer filament that has been made from reused or repurposed plastic materials. It is usually made from plastic waste like failed 3D prints, plastic bottles, or plastic bags that are shredded and re-melted into filament.Recycled filament has become a more popular option for makers and 3D print shops looking for an eco-friendly material. It provides a lower carbon footprint compared to virgin plastics.