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Extruder Spring is used to keep pressure constant on a bearing located inside the extruder. While, the bearing will push the filament into the drive gear which will grip on the filament and then channel the filament into the hotend of the extruder.
If there is insufficient tension on the bearing, it will leads to extrusion issue because pressure on the filament is weak and vice versa.
1 x Generic Extruder Spring