My cobbled together control board is, obviously, put together from different projects. It is only capable of driving 2 stepper motors (8 output lines in pport). Entirely new board will be needed for full 3 stepper motor complement required. This is probably the first element of the system to be improved, thereby permitting tool to disengage from the workpiece as required. This will mean new toolholder design, much better than just a marker holder.