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QUESTIONFlowState

Prusa MK4 under-extrusion only on the fastest infill

Perimeters look smooth and extrusion calibration is close, but sparse infill gets thin and occasionally clicks at higher speeds. Same spool works at lower speed. Is this more likely flow limit, temperature, or partial nozzle blockage?

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NozzleNotes

That sounds like volumetric flow limit. If slowing only infill fixes it immediately, try a modest temperature increase or cap max volumetric speed before touching extrusion calibration.

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