This will not work for Simple V2 ordered after October 2013. Printrbot changed the design around that time to close up the required opening. Tired of filament constantly drifting and jamming, I tried John Biehler's version that incorporated the "drinking straw mod." with decent success. Upon closer inspection of the Printrbot, the hot end is NOT aligned with the center of the extruder idler bearing. It is off center almost 1mm toward the motor. Combine this with the fact that I broke the arm of John's guide so it floated very loose in the slot, I designed my own version. Shown in the gallery is a rendering of the three versions, just for reference.