A filament feeder for use in an additive manufacturing system, comprising a main feeder body having mounted thereon a first biasing roller and a driven first gripper roller arranged at an adjustable first roller distance from each other allowing a filament material to be received between the first biasing roller and the first gripper roller. The filament feeder further comprises a second biasing roller and a driven second gripper roller arranged at an adjustable second roller distance from each other for receiving the filament material. A biasing assembly is provided in resilient engagement with the first and second biasing rollers and configured to bias the first and second biasing rollers toward the first and second gripper rollers, respectively, during an additive manufacturing process.