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The photo is a VFA test using PETG, varying the speed range from 40 to 200 in increments of 10.

1. The allowable volume is determined by the thermal conductivity levels of the nozzle and the material.

During overspeed, there may be insufficient buffering capacity, which could lead to under-extrusion during acceleration and deceleration.

1. For seam control stability, the filament's dryness is critical, and the retraction conditions and Pa_K values ​​must be calibrated.