Two days ago, someone posted a message at http://3dprintboard.com/showthread.p...highlight=petg asking for help with Z-Offset in Cura. In that message there is a link to another website at https://www.xyzfabs.com/forums/topic...lack-filament/ I set up Simplify 3D following instructions on that website. After 3D-printing a test box, I tried to 3D-print sunroof for a model car that require supports and the bottom surface is still rough. How can I fix this problem?