A nozzle clog is the most frequent cause of under-extrusion. Confirm this by listening for a distinct clicking or thumping sound originating from the extruder motor during operation; this noise indicates that the motor is skipping steps because it cannot push filament through a physical blockage in the nozzle. Additionally, verify by attempting to extrude filament manually; if the motor clicks and little to no material exits the nozzle, a partial or full obstruction is present.
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