Inkjet printer comprising a cartridge for holding ink pellets (20, 33) and means for separating and releasing a single ink pellet (20, 33) at a time and feeding it to the ink-supply unit of a printing head, the cartridge having at least one exit for releasing an ink pellet, wherein the separating and releasing means comprise: - a rotatable shaft extending in a first transport direction comprising a spiralling member (12, 31) at the circumference of said shaft for transporting the ink pellet (20, 33) in the first transport direction; characterized in that the separating and releasing means further comprise: - an ink pellet tangential movement confining member extending in a parallel direction with respect to said rotatable shaft and positioned at a distance from said spiralling member (12, 31) for: - forming with said spiralling member (12, 31) a first, stable area in which said ink pellet (20, 33) is transported in said first transport direction toward the at least one exit on which first, stable area the ink pellet (20, 33) tends to roll towards the ink pellet tangential movement confining member; and - confining the movement of the ink pellet (20, 33) in a direction tangential to the circumference of the spiralling member (12, 31), wherein the rotatable shaft is positioned at an angle with respect to the direction of the gravitation force (g), such that on each winding of the spiralling member (12, 31) two areas (19, 35) can be distinguished; - the first, stable area on which an ink pellet tends to roll towards the tangential movement confining member; and - a second, instable area on which an ink pellet tends to roll away from the tangential movement confining member and off the spiralling member (12, 31). - a rotatable shaft extending in a first transport direction comprising a spiralling member (12, 31) at the circumference of said shaft for transporting the ink pellet (20, 33) in the first transport direction; - an ink pellet tangential movement confining member extending in a parallel direction with respect to said rotatable shaft and positioned at a distance from said spiralling member (12, 31) for: - forming with said spiralling member (12, 31) a first, stable area in which said ink pellet (20, 33) is transported in said first transport direction toward the at least one exit on which first, stable area the ink pellet (20, 33) tends to roll towards the ink pellet tangential movement confining member; and - confining the movement of the ink pellet (20, 33) in a direction tangential to the circumference of the spiralling member (12, 31), - forming with said spiralling member (12, 31) a first, stable area in which said ink pellet (20, 33) is transported in said first transport direction toward the at least one exit on which first, stable area the ink pellet (20, 33) tends to roll towards the ink pellet tangential movement confining member; and - confining the movement of the ink pellet (20, 33) in a direction tangential to the circumference of the spiralling member (12, 31), - the first, stable area on which an ink pellet tends to roll towards the tangential movement confining member; and - a second, instable area on which an ink pellet tends to roll away from the tangential movement confining member and off the spiralling member (12, 31).