a plunger unit including a plunger and a lip extending from at least a portion of a perimeter of a front side of the plunger;

a receiver unit including a receiver cup defining a cavity configured to receive at least a portion of the plunger;

a grate including perforations, a first end section rotatably associated with the plunger unit, and a second end section rotatably associated with the receiver unit; and

a paddle attachable to the receiver unit, the paddle including a trough section positionable adjacent the grate when the paddle is attached to the receiver unit, and the trough section of the paddle being configured to receive material extruded through the grate;

wherein the plunger unit and the receiver unit are rotatable with each other upon two separate axes, so that the lip contacts and sweeps a surface of the receiver cup that defines the cavity.