Recyklace PET lahví pro výrobu filamentu pro 3D tiskárny

Abstract

This bachelor’s thesis deals with the possibility of producing 3D printing filament from waste PET bottles and with the design of an automated control system for this process. The theoretical part summarizes the properties of PET, the possibilities of its recycling, and the requirements placed on filament for FDM/FFF technology. The practical part is based on the PETamentor2 device, in which several shortcomings of the original design were identified during testing, especially in the area of temperature measurement and control. Based on these findings, a custom control unit built around the Arduino Nano microcontroller was designed and implemented. A K-type thermocouple with a MAX6675 converter was selected for nozzle temperature measurement, and a PI controller was used to stabilize the heating process. The design also included a new electrical wiring scheme and the addition of an OLED display for showing operating values. The result of the thesis is a functional design of a control system for a device intended to produce filament from PET bottles. Practical testing confirmed that the produced filament can be used for 3D printing, although its quality does not yet reach the level of common commercial materials. The thesis therefore provides a basis for further development of the device and its future technical improvement.