Hi Matthew,

The sketchy styles use raster image files for the edges and are very resolution dependent. I cannot explain it any better than Ross a couple of years ago when this whole forum started so I'd rather link to that post:
http://forums.sketchucation.com/viewtopic.php?f=18&t=968

Hi Matthew and welcome!

The Woodworking forum (and the "foreign language) forums are subscription based so that those who are not interested, don't have to deal with them.

I've added you to the Woodworkers usergroup now so you should be able to see it and post there. Here is your User Control Panel where you can arrange stuff like this for yourself.
http://forums.sketchucation.com/ucp.php?i=167

Look around there as there are a bunch of settings you can also make there.