How to use Repetier Host - The Basics and G-Code
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http://gbe.st/302kjJu
Learn how to use the basics of Repetier host, including where the settings are, how to add objects to print, what the different menus do, and how to use it to control your printer. Also, there is some basic g-code commands included at the end. See here for a full list of all g-code commands you can utilize.
http://en.wikipedia.org/wiki/G-code