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ReplicatorG is a simple, open source 3D printing program - ReplicatorG
This is the software that will drive your MakerBot Thing-O-Matic , CupCake CNC , RepRap machine , or generic CNC machine. You can give it a GCode or STL file to process, and it takes it from there. It's cross platform, easily installed, and is based on the familiar Arduino / Processing environments. ReplicatorG is used by thousands of MakerBot Operators, and has printed tens of thousands of objects and counting.