A knotter system for a baler includes a needle and a tucker arm for delivering a needle twine and tucker twine respectively, a twine receiver for holding the needle and the tucker twine, a billhook assembly including a billhook with a lower and an upper lip being mounted rotatably around an axis and being arranged for receiving the needle and the tucker twine, a twine finger for guiding the twine. Further, a driver is foreseen to make the billhook perform a first full rotation during the first knot forming cycle and a second full rotation during the second knot forming cycle. The knotter system is configured such that, at the end of the second knot forming cycle, a bale movement of a bale in the baler exerts a pulling force on the twines which removes the twines from the billhook.
