The printer is currently on bread board. I've got a small Arduino to handle printing. Right now I've got it working up to the point to put dots on the paper. It runs the motor, counts the pushes, goes to stability and sends the signals to print but the solenoids to fire.
I can manually activate the solenoids with a pushbutton and I get ink on the paper. I think the Arduino may not be able to source the current to actuate the solenoids. Still looking into this.  The schematic is also there. Once I get the printer working I'll think I'll set it up on the Pi as a serial printer.

The STA401A should be doing all the heavy lifting. So I'm not sure what's going on. I'll have to hookup the analyzer to it and take some voltage and current measurements of the the actual circuit and mine.