A method for fabricating a Coriolis flowmeter from a single polymer material, the method comprising: providing a dynamically responsive manifold from a first polymer material, the dynamically responsive manifold comprising: a body ; at least four tubular port extensions integral to the body , each tubular port extension including a weld surface ; and at least one isolation plate integral to the body and the at least four tubular port extensions ; and characterised by providing at least two flow-sensitive members formed by shaping at least two tubes to a predetermined shape, the at least two tubes made from the first polymer material, and each flow-sensitive member including two open ends ; wherein: shaping the at least two tubes to a predetermined shape comprises: heating one of the at least two tubes to a temperature near a glass transition temperature of the first polymer material, forming the tube into the predetermined shape, dissipating mechanical stress within the shaped tube by maintaining the temperature for a time period, and cooling the shaped tube; and in that the method further comprises: welding each open end of the at least two flow-sensitive members to a corresponding weld surface of one of the at least four tubular port extensions . providing a dynamically responsive manifold from a first polymer material, the dynamically responsive manifold comprising: a body ; at least four tubular port extensions integral to the body , each tubular port extension including a weld surface ; and at least one isolation plate integral to the body and the at least four tubular port extensions ; and a body ; at least four tubular port extensions integral to the body , each tubular port extension including a weld surface ; and at least one isolation plate integral to the body and the at least four tubular port extensions ; and characterised by providing at least two flow-sensitive members formed by shaping at least two tubes to a predetermined shape, the at least two tubes made from the first polymer material, and each flow-sensitive member including two open ends ; wherein: shaping the at least two tubes to a predetermined shape comprises: heating one of the at least two tubes to a temperature near a glass transition temperature of the first polymer material, forming the tube into the predetermined shape, dissipating mechanical stress within the shaped tube by maintaining the temperature for a time period, and cooling the shaped tube; and in that the method further comprises: welding each open end of the at least two flow-sensitive members to a corresponding weld surface of one of the at least four tubular port extensions . shaping the at least two tubes to a predetermined shape comprises: heating one of the at least two tubes to a temperature near a glass transition temperature of the first polymer material, forming the tube into the predetermined shape, dissipating mechanical stress within the shaped tube by maintaining the temperature for a time period, and cooling the shaped tube; heating one of the at least two tubes to a temperature near a glass transition temperature of the first polymer material, forming the tube into the predetermined shape, dissipating mechanical stress within the shaped tube by maintaining the temperature for a time period, and cooling the shaped tube; and in that the method further comprises: welding each open end of the at least two flow-sensitive members to a corresponding weld surface of one of the at least four tubular port extensions . <EOS>