I'm been trying to print some larger and more complex models, and this usually requires support material so the printer doesn't start trying to print in the air. However, I haven't been able to successful complete a print because my printer (RepRap Prusa model) will freeze about the 3rd or 4th layer when I print models with support material. It doesn't stop or pause, but all axes stop moving (inby jataro - Slic3r