Yes, I've been printing camera mounts for a couple of years, they're as strong as purchased stuff. You can dial up the strength by increasing infill, but generally I print at normal (20%) infill which is far weaker than full strength and it's still plenty strong even on rough roads. I've got a number of mounts for a variety of cameras up on Youmagine. (I used to post to Thingiverse until Makerbot sold out the OSS community).

By the way, the stuff doesn't "dry" - it's printed in molten plastic and just has to cool. You can pop it off the print bed 5 seconds after the printer stops. It's pretty hard within 3 or 4 seconds, it just has to cool a bit.