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Why is my print under-extruding?

The filament is the last suspect, not the first. Work the list in this order.

Order of likelihood: nozzle partially clogged, extruder tension wrong, filament path obstructed, then — last — wrong filament diameter. Forgely runs at 1.75 mm ±0.02 mm; if your slicer is set to 1.75 mm and you are under-extruding, it is not the filament. Cold-pull the nozzle and check extruder gear for ground filament dust.

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