The present application provides methods and devices for producing micro-fluids. A communications interface receives a packet between a source and a destination. The next stage includes a postcoder coupled to receive channel domain information from the first stage and to convert the channel domain information to user domain information. When the wafer is etched, a visible boundary can be seen between a region where the intermediate layer has been entirely etched away, and a region where at least some of the intermediate layer remains. A configuration tool is further provided for editing and creating such description files.