About this 3D model

This is a 2 extruder mod for Prusa Mendel 3D printer. The mod is for Makergear hotends and Greg Frost's extruder design v3. The firmware is based on Marlin. The electronics are RAMPS v1.4. Note: A more advanced version of this mod is [RepRap X2V3](http://www.thingiverse.com/thing:239745).