A capillary cartridge assembly for positioning a sample fluid at a geometric center between juxtaposed pole pieces of a NMR magnet assembly for NMR analysis comprises a capillary captured in a channel in a printed circuit board assembly that is sized to fit between the pole pieces. In one embodiment, the controller includes a side-access, multi-part assembly including a collet or other gripping element that applies a uniform radially inward force on the guidewire. Each station may include finishing operations on the deposited material, including but not limited to heating, annealing, curing, fusing, surface-treating, laser-processing, charge neutralizing, barrier processing, etching, electroplating, and passivating. The tether element may have a variety of configurations. , and can be used in making industrial products, such as gas detection films, sensors, encapsulation material, photoelectrical communication material, and biomedical material, etc.