Hey @Dale_Chamberlain , what happened when it failed?
From what medium did you print?
- USB/Serial connection to your laptop (sleep mode deactivated?)
- USB thumb drive
There is no debugging option build in, the only way is to watch the serial monitor alias terminal to see what happened when it fails, i guess.
My next suggestion would be to change the usb thumbdrive to a new one (there where several defective original thumb drive and other thumb drives out there in the forum).
Hope this helps!