This configuration has a flexible dispense tip that rides on the substrate surface with the dispensed fluid emerging from dragging tip. The fluid flow rate can be synchronized with motion to create a quantitative rate of flow per unit length of reagent on the substrate surface.FrontLine dispensing is ideal for printing lines on membranes and other substrates for BioChips. The technology couples a high resolution syringe pump with a microtube. During dispensing the micro-tube glides across the surface of the membrane or substrate to create a quantitative line. The width of the line can be adjusted by increasing or decreasing the programmed volume of the line.