Merry Christmas: My 4k word epic tutorial on setting up a Printrbot Simple 3D printer kit.
http://joshondesign.com/2013/12/23/slug
Nice try but if you use repetier you can alter the e steps direct to firmware then its easier than using G commands. And really all axis should be checked for travel before printing as my simple was a good 10 mm off on x axis.
Like I said good attempt and should help the people new to printing.