i have a problem when I starting a new print job the nozzle will make a collision by making the second layer off the raft.if this happens the starting point has been moved. Before I start printing, I first do a calibration of the bed. and I also changed the distance of the nozzle height.I wonder if there is a default setting. and I have the idea that as soon as the print head moves it should not have a freewheel distance? is this right??