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3D Printer Volumetric Flow Rate Calculator . This calculator is designed to help 3d printer users find problems with printer configuration or find the optimal parameters for the desired speed. Every hotend and extruder combination has a capacity to melt and deposit a certain volume of filament every second. Modify 3d printing gcode on yuchen chen from yucchen.com 3d printer feed rate vs flow rate. To calculate the maximum flow rate, we still need the diameter of your filament, measure your filament at various points and calculate the average filament diameter. Besides this, flow rate calibration can also improve retraction values a bit and help with bulging corners and.