Methods, systems, and apparatus for drive a pumping chamber of a fluid ejection system are disclosed. For example, the aminocarboxylate compounds or their salts may be one or more of iminodiacetic acid, iminodisuccinic acid, ethylenediamine triacetic acid and ethylenediamine disuccinic acid, or their salts. The intermediate layer of switches includes two sublayers: a first sublayer providing horizontally aligned fan-outs to the final terminal layer of switches and a second sublayer providing vertically aligned fan-outs to the final terminal layer of switches. The composite member is processed to remove the core member from the lumen of the outer member without harming the outer member, leaving a hollow tubular member already formed into the desired pattern.