In a printer in a system comprising multiple printers connected to a LAN, the service technician executes certain diagnostic adjustment through the operation of keys on the operation unit. Computer instructions are usable to receive and store preselected parameters, which include pressure, temperature, and acceleration ranges, and to compare measured values to these ranges for forming a determination usable to initiate actuation of a downhole tool. A display processor that provides a visual display of time dimensioned output of the severity of the dynamic patterns and a visual display of the sensitivity, specificity, therapeutic delay, andor the correlation metric in real-time or near real-time. A dispense stop feature of the lead screw nut and a dispense stop feature of the drive member prevent the generation of the helical movement of the lead screw when a specified end position of the drive member is approached.