New i3V owner: A few beginner questions

[printbus]

gmay3, how did your knob in http://3dprintboard.com/showthread.p...umbwheel-Model print? Looking at mine, my top side has the same mesh look that DanSilov is battling here. You can even see it in the picture I posted.

EDIT: Looking at the gcode, that was the last item I printed with a bridge speed of 150mm/Sec as set in the Makerfarm Slic3r config files. That seems awfully fast to my inexperienced judgement. For my knob, slic3r has a bridge layer under the top layers, and perhaps the bridge didn't work very well and the top layers aren't properly supported. My recent prints are coming out solid top (now I'm using a bridge speed of 70mm/sec), but I've also been dinking around with ABS since that knob.