I'm completely new to 3d Printers, the guy and gal at Microcenters convinced me that the Solidoodle 4 was the way to go. So I've followed the instructions on their website up to extruding filament and everything works fine. But the instructions pretty much end there, there's no calibration information or how to do your first print. Is there any calibration I need to do so that the extruder head doesn't damage the bed? Any pointers would be much appreciated.