i3 Build Plates, with Upgrades

These are build plates for a single sheet style Prusa i3. It uses many upgrades
from around Thingiverse. I won't list them here, but they are listed on my blog [here](http://esreprapblog.wordpress.com/2013/08/10/build-plates-finished-2/), and are also listed as the ancestors for this Thing.
You'll notice that there are two sets of Z couplers. This is because I forgot initially that the z-rods on the i3 are M5. I left the original M8 (Applerust's) ones in there, because I figured they'd come