A filament feeder (1) for use in a fused filament fabrication printer comprises a feeder body (2) which comprises a channel (3) for guiding a filament (F) there through. A first and a second driven grip roller (4, 5) are arranged on opposing sides of the channel (3) for clamped engagement with the filament (F), wherein the first grip roller (4) is rotationally arranged about a first roller axis (4a) and the second grip roller (5) is rotationally arranged about a second roller axis (5a). The feeder comprises a first drive gear (6) for driving the first grip roller (4), the first drive gear (6) being rotatably arranged about the first roller axis (4a), a second drive gear (7) for driving the second grip roller (5), the second drive gear being rotatably arranged about the second roller axis (5a), and a suspension system (S) for suspension of the first and second grip roller (4,5) and of the first and second drive gear (6,7). The suspension system (S) is arranged to allow lateral movement of the first and second grip rollers (4, 5) with respect to the channel (3) for providing a variable distance (D+AD) between the first and second roller axes (4a, 5a).