br br The MakerBot Replicator 2 builds solid, three-dimensional objects out of melted MakerBot PLA Filament. Your 3D design files are translated into instructions for the MakerBot Replicator 2 and sent to the machine via USB or SD Card. Then the MakerBot Replicator 2 heats the MakerBot PLA Filament and squeezes it out through an extruder to build a solid object layer by layer. The technical term for the way the MakerBot Replicator 2 creates objects is Fused Filament Fabrication (FFF).