Knotter system for a baler for performing a knotter cycle comprising a first knot forming cycle and a second knot forming cycle, said knotter system comprising: a needle configured for delivering a needle twine; a tucker arm configured for delivering a tucker twine; a twine receiver (86, 220) configured for holding the needle twine and the tucker twine; a billhook assembly comprising a billhook (82, 100) with a lower lip and an upper lip mounted pivotally with respect to the lower lip along a pivotal axis, said billhook being mounted rotatably around a rotation axis and being arranged for receiving the needle twine and the tucker twine; a cutting arm adapted for cutting twines; a twine finger configured for guiding at least the needle twine; a drive means (96, 98, 100; 110, 112; 122, 124, 126, 128, 134) adapted to make the billhook perform at least a first full rotation around the rotation axis during the first knot forming cycle and a second full rotation around the rotation axis during the second knot forming cycle, to move the cutting arm a first time from a rest position to an extended position and back during the first knot forming cycle and a second time during the second knot forming cycle, and to move the twine finger at least a first time during the first knot forming cycle and a second time during the second knot forming cycle; wherein a bale movement of a bale which is being formed by the baler exerts a pulling force on the twines; characterized in that the billhook, cutting arm, and twine finger are configured to position the twines, at the end of the second knot forming cycle, to be supported by the cutting arm such that the pulling force removes the twines from the billhook, and wherein the upper lip of the billhook is formed such that the upper lip and lower lip define an opening angle in the direction of the pulling force. a needle configured for delivering a needle twine; a tucker arm configured for delivering a tucker twine; a twine receiver (86, 220) configured for holding the needle twine and the tucker twine; a billhook assembly comprising a billhook (82, 100) with a lower lip and an upper lip mounted pivotally with respect to the lower lip along a pivotal axis, said billhook being mounted rotatably around a rotation axis and being arranged for receiving the needle twine and the tucker twine; a cutting arm adapted for cutting twines; a twine finger configured for guiding at least the needle twine; a drive means (96, 98, 100; 110, 112; 122, 124, 126, 128, 134) adapted to make the billhook perform at least a first full rotation around the rotation axis during the first knot forming cycle and a second full rotation around the rotation axis during the second knot forming cycle, to move the cutting arm a first time from a rest position to an extended position and back during the first knot forming cycle and a second time during the second knot forming cycle, and to move the twine finger at least a first time during the first knot forming cycle and a second time during the second knot forming cycle; to make the billhook perform at least a first full rotation around the rotation axis during the first knot forming cycle and a second full rotation around the rotation axis during the second knot forming cycle, to move the cutting arm a first time from a rest position to an extended position and back during the first knot forming cycle and a second time during the second knot forming cycle, and to move the twine finger at least a first time during the first knot forming cycle and a second time during the second knot forming cycle;