A dispenser for dispensing viscous material on a substrate having a top surface and a bottom surface, the dispenser comprising: a frame; a gantry system coupled to the frame; a dispensing unit coupled to the gantry system, the gantry system being configured to move the dispensing unit in x-axis, y-axis, and z-axis directions; and a substrate support assembly coupled to the frame and configured to support the substrate in a dispense position to dispense material on the top surface of the substrate and on the bottom surface of the substrate, the substrate support assembly including a clamping system configured to receive and support the substrate in the dispense position, and an inverter system coupled to the frame and the clamping system, the inverter system being configured to rotate the clamping system about an axis that is perpendicular to transport direction of the substrate between a first position in which the top surface of the substrate is in the dispense position and a second position in which the bottom surface of the substrate is in the dispense position, characterized in that the clamping system includes a first clamping assembly configured to clamp one edge of the substrate and a second clamping assembly configured to clamp an opposite edge of the substrate, each clamping assembly (160, 162) including an upper clamping member and a lower clamping member, the upper and lower clamping members (172, 174) being configured to clamp an edge of the substrate, the upper and lower clamping members (172, 174) being connected to at least one spring to bias the clamping members to the clamped position, each clamping assembly (160, 162) further including a clamp jaw positioned between the upper and lower clamping members (172, 174), the at least one spring applying a torsional load to at least one of the upper and lower clamping members (172, 174) to apply a clamping force on the substrate to position the substrate within the clamp jaw. a frame; a gantry system coupled to the frame; a dispensing unit coupled to the gantry system, the gantry system being configured to move the dispensing unit in x-axis, y-axis, and z-axis directions; and a substrate support assembly coupled to the frame and configured to support the substrate in a dispense position to dispense material on the top surface of the substrate and on the bottom surface of the substrate, the substrate support assembly including a clamping system configured to receive and support the substrate in the dispense position, and an inverter system coupled to the frame and the clamping system, the inverter system being configured to rotate the clamping system about an axis that is perpendicular to transport direction of the substrate between a first position in which the top surface of the substrate is in the dispense position and a second position in which the bottom surface of the substrate is in the dispense position, characterized in that the clamping system includes a first clamping assembly configured to clamp one edge of the substrate and a second clamping assembly configured to clamp an opposite edge of the substrate, each clamping assembly (160, 162) including an upper clamping member and a lower clamping member, the upper and lower clamping members (172, 174) being configured to clamp an edge of the substrate, the upper and lower clamping members (172, 174) being connected to at least one spring to bias the clamping members to the clamped position, each clamping assembly (160, 162) further including a clamp jaw positioned between the upper and lower clamping members (172, 174), the at least one spring applying a torsional load to at least one of the upper and lower clamping members (172, 174) to apply a clamping force on the substrate to position the substrate within the clamp jaw.