Watch out for the bed fan colliding with models when printing several models sequentially in the same print. (In S3D this is done with merging processes and choosing the sequential option when generating gcode.)
I had a print this morning with 5 models and the first 3 were fine but on the 4th the nozzle made a move that collided the bed fan with one of the already printed models. They were only about 4mm high, but I had elmers on the glass, the model stuck, the steppers skipped, and when it got to printing again everything was offset a few millimeters.
You could avoid this by carefully making sure the models print from back to front (in Y). Or else remove the bed fan, which is what I'm doing since I never use it anymore. I print slowly for the quality anyway and don't need the fan at my speeds.