I have a Replicator 2X that keeps failing about 12-14 hours into a 16 hour print. It appears that the nozzle temporarily clogs, the feed wheel eats a half moon into the now-stationary filament and prevents it from feeding further, and I come back the next morning, to a printer proudly saying "Print complete!" with only 75% of my model done. A simple unload/load routine and the printer is good to go- no screwing with the nozzle, which I've taken apart before to clean an extremely impacted jam.

Is there any way to restart the print at a certain layer? Edit the file, perhaps? I'm very familiar with G code programming from CNC mills and lathes, so finding the restart layer would not be a hurdle if I could edit the file.

Beyond that, how can I protect myself against print failures such as this?