Just got inspired of this guy, he makes signs in ENROUTE PRO software. http://www.imaginationcorporation.com http://multicamdan.blogspot.no and wanted to try to see if I could make a sign in Solidworks and Meshmix. And it seems that you can do that, maybe not as fancy yet, but I think with a little practice it might be good eventually.
Printed on a daVinchi 1.0 Aio 3d printer, no mods just out of the box and proper leveled. 0,2 mm hight, 10% infill PLA.