Sequential Batch 3D Printing using Automatic Print Ejection

UPDATE #2 6/27/2018: This is working so well that I wanted to queue several batch files at the same time to print overnight and today while I was at work (a batch file for the batch files if you will) so I modified the batch_print.exe script so if you answer "Yes" to the first question to print multiple copies of the same model, it will now save the batch gcode file with the syntax "numberofcopiesX_selectedfile.gcode".

For example, one of my lightsaber batch files was saved as "20X_papermate_luke_esb.gcode". Then I ran batch_print.exe again and this time answered "No" to the first question which prompted me to add files one at a time so I selected these previously generated multiple print batch files:
20X_papermate_luke_esb.gcode
20X_papermate_vader_esb.gcode
20X_papermate_vader_rotj.gcode

That generated one huge gcode file called "batch_print.gcode" to print all 60 models. It's been printing perfectly for 24 hours.

UPDATE #1 6/26/2018: I discovered another benefit