Fluidic elements are manufactured in various ways such as injection moulding, epoxy casting and from photo-sensitive ceramic and plastics. Most of the initial work on elements has been carried out using Dycril because of its ease in processing and the equipment required is fairly cheap and simple. Many companies have then developed satisfactory designs using Dycril and used them as ‘masters' in other production processes. Most users of Dycril have reported that nozzle widths of less than 0.015in cannot be satisfactorily etched from 0.040in thick Dycril. Various methods of etching have been tried at Cranfield and this report outlines some of the difficulties encountered and suggests a standard pattern to be followed from the drawings of the master at ten times full size through to the complete element.