This research paper presents the development of an automated filament maker machine that produces good-quality PET filaments from waste bottles, with the aim of addressing the growing concern about plastic waste and promoting sustainable manufacturing practices. The plastic bottles are cut manually with a 3D-printed, handy cutter into spiral-shaped, continuous strips. These are then fed into an automated filament maker machine to produce filaments of diameter 1.75 mm. The developed machine is equipped with a PID temperature controller and a PWM motor controller to regulate the temperature and speed of the extruder, respectively, ensuring consistent quality and diameter of the produced filaments. The produced filaments will be tested and evaluated for their mechanical properties and dimensional accuracy, and the results will be compared to commercial-grade PET filaments. The production efficiency and cost-effectiveness of the developed filament maker machine were also evaluated, with consideration given to energy consumption and raw material costs. The findings demonstrate that the developed machine can produce high-quality PET filaments from waste bottles efficiently and cost-effectively, with potential applications in 3D printing and other additive manufacturing processes. The results of this study have significant implications for sustainable manufacturing practices and the circular economy, as they provide a viable solution for converting plastic waste into valuable materials. The study concludes that the developed automated filament maker machine provides a promising alternative for sustainable and efficient production of 3D printing filament from waste water bottles, which can contribute to a more sustainable 3D printing industry.