So you have designed a part in your 3D CAD program and you want to print it on your RapMan, so you need to convert it to g-code right?
You can of course use Skeinforge. This is a brilliant piece of open source software written by “Enrique” and can be downloaded from http://fabmetheus.blogspot.com/
Although you have a lot of control of how RapMan will print your part using Skeinforge it is a quite complicated program for students to understand. Also some school networks will not allow you to install Python, the “language” that Skeinforge uses.
There is however an alternative…. NetFabb Studio and the “Engine” for RapMan. This is available in several different versions from the NetFabb site http://www.netfabb.com/ and from BfB http://bitsfrombytes.com/
The free version of NetFabb will allow you to view scale, move and repair your .stl files but not convert it to g-codeA “paid for” version with the engine for RapMan does the above PLUS conversion to g-code (education prices are available)A professional version (to be released soon) will do ALL the above PLUS more sophisticated editing of stl and mesh file… and more.And…. there is a free version of the NetFabb viewer for iPhone or iPod Touch http://www.netfabb.com/mobile.php