filament diameter during the extrusion process. We defined the extrusion process and explained how the diameter of the extruded filament can be controlled by the combined action of the measuring and puller system. We have constructed a Hall effect sensor measuring instrument and developed a suitable program to control the filament diameter. The measuring system was calibrated using benchmarks and suitable software, the standard deviation of the measurements and the standard uncertainty of the measurements were determined. Some test measurements were made with the measuring instrument and analysed accordingly. When analysing the measurements, we detected a significant noise in the signal and found that the measured values deviated too much from the actual value at certain sections in the measuring range. Accordingly, we have proposed the necessary improvements to enable the measurement system to be actually used to control the filament diameter during the extrusion process.
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