After fighting the urge for a few months, I finally broke down and bought Simplify3D, hoping it's as wonderful as everyone says it is. I downloaded the Windows version for the PC that controls the printer, and also the Mac version so I can play with it sans the printer. One thing I thought strange, I loaded the same object on both machines, didn't change any of the settings and did "prepare to print". The build time and amount of filament were significantly different, with the PC doing it faster than the Mac. I don't understand what the computers have to do with the speed of the build or amount of filament used.