I've been trying to get Cura working for my Pegasus 10", after exclusively using Simplify3D. I can't get my first layer to adhere to the bed. I'm using PLA, and with S3D I've never had trouble getting bed adhesion using painter's tape on a non-heated bed. It's not a z-offset issue. I've got S3D configured without an offset, so I'm just using what I have set in Marlin. It seems to me like it might be an extrusion issue, like something about the way that S3D gcode extrudes works better than Cura. My speeds appear to be set correctly, I've tried printing both faster and slower in Cura, and the same thing happens. Instead of the material adhering to the surface, it rolls.