onstep minipcb2 case

I remixed this case to fit my minipcb2 board. I had to resize is a little in both directions to fit. I added holes in the case for the LED on the minipcb2 board. I also split it up into 3 parts so that the print times could be shorter. There is a bottom that the board sits on and might be able to be screwed to. Then the middle which will help keep the board from moving to much. The top was also redone so that screws were not needed. The top of the case has a notch that indicates which side the motors are on.