A workpiece carrier for supporting a plurality of workpieces, the workpiece carrier comprising a supporting body including a plurality of workpiece support elements, each for supporting a workpiece and providing for individual positioning of the same, the workpiece support elements each including at least one biasing element for applying a biasing force to an edge of the respective workpiece, at least one first cam for acting on an edge of the respective workpiece at a first location against the bias of the at least one biasing element, and at least one second cam for acting on an edge of the respective workpiece at a second location against the bias of the at least one biasing element, wherein the at least one first cam and the at least one second cam are operable such as to enable the position of the respective workpiece to be set relative to the supporting body.