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gap is too large, the filament cannot be fed. When loading the filament
for the first time, press the handle to let the filament pass through the
extruder to the nozzle, and rotate the handle to adjust the gear gap until
the filament can be fed smoothly. But the clearance does not need to be
too low, otherwise the gear may flatten the filaments and make feeding
difficult, especially for flexible materials, such as TPU.